meminfo: Print allocated physical memory percentage

gcc seems to optimize some calls to strcpy to stpcpy

.clangd

@@ -1,13 +0,0 @@
-Diagnostics:
-  Suppress: target_unsupported_type
-
-CompileFlags:
-  Remove: [
-    -fstrict-volatile-bitfields,
-    -fno-tree-loop-distribute-patterns
-  ]
-  Add: [
-    -D__banan_os__,
-    -D__arch__=x86_64,
-    -D__x86_64__
-  ]

.gitignore

@@ -2,5 +2,7 @@
 .idea/
 build/
 base/
-script/fakeroot-context
+*.tar.*
-tools/update-image-perms
+toolchain/*/
+
+!base-sysroot.tar.gz

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "kernel/lai"]
+	path = kernel/lai
+	url = https://github.com/managarm/lai.git
+	ignore = untracked

.pre-commit-config.yaml

@@ -1,8 +0,0 @@
-# .pre-commit-config.yaml
-exclude: '.patch$'
-repos:
--   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.1.0  # this is optional, use `pre-commit autoupdate` to get the latest rev!
-    hooks:
-    -   id: end-of-file-fixer
-    -   id: trailing-whitespace

.vscode/c_cpp_properties.json

@@ -1,38 +0,0 @@
-{
-    "configurations": [
-        {
-            "name": "banan-os",
-            "includePath": [
-                "${workspaceFolder}/BAN/include",
-                "${workspaceFolder}/kernel/include",
-                "${workspaceFolder}/userspace/libraries/*/include"
-            ],
-            "defines": [
-                "__arch=x86_64",
-                "__enable_sse=1"
-            ],
-            "compilerPath": "${workspaceFolder}/toolchain/local/bin/x86_64-banan_os-gcc",
-            "cStandard": "c17",
-            "cppStandard": "gnu++20",
-            "intelliSenseMode": "linux-gcc-x64"
-        },
-        {
-            "name": "banan-os-kernel",
-            "includePath": [
-                "${workspaceFolder}/BAN/include",
-                "${workspaceFolder}/kernel/include",
-                "${workspaceFolder}/userspace/libraries/*/include"
-            ],
-            "defines": [
-                "__arch=x86_64",
-                "__is_kernel",
-                "__enable_sse=1"
-            ],
-            "compilerPath": "${workspaceFolder}/toolchain/local/bin/x86_64-banan_os-gcc",
-            "cStandard": "c17",
-            "cppStandard": "gnu++20",
-            "intelliSenseMode": "linux-gcc-x64"
-        }
-    ],
-    "version": 4
-}

.vscode/settings.json

@@ -1,10 +0,0 @@
-{
-    "cmake.configureOnOpen": false,
-    "editor.tabSize": 4,
-    "editor.insertSpaces": false,
-    "editor.detectIndentation": false,
-    "clangd.arguments": [
-        "--compile-commands-dir=${workspaceFolder}/build",
-        "-header-insertion=never"
-    ]
-}

BAN/.gitignore

@@ -0,0 +1,3 @@
+*.a
+*.d
+*.o

BAN/BAN/Assert.cpp

@@ -1,22 +0,0 @@
-#include <BAN/Assert.h>
-
-#if __is_kernel
-
-#include <kernel/Panic.h>
-
-[[noreturn]] void __ban_assertion_failed(const char* location, const char* msg)
-{
-	Kernel::panic_impl(location, msg);
-}
-
-#else
-
-#include <BAN/Debug.h>
-
-[[noreturn]] void __ban_assertion_failed(const char* location, const char* msg)
-{
-	derrorln("{}: {}", location, msg);
-	__builtin_trap();
-}
-
-#endif

BAN/BAN/String.cpp

@@ -0,0 +1,262 @@
+#include <BAN/Errors.h>
+#include <BAN/Math.h>
+#include <BAN/Move.h>
+#include <BAN/New.h>
+#include <BAN/String.h>
+#include <BAN/StringView.h>
+
+#include <string.h>
+
+namespace BAN
+{
+
+	String::String()
+	{
+		MUST(copy_impl(""sv));
+	}
+
+	String::String(const String& other)
+	{
+		MUST(copy_impl(other.sv()));
+	}
+
+	String::String(String&& other)
+	{
+		move_impl(move(other));
+	}
+
+	String::String(StringView other)
+	{
+		MUST(copy_impl(other));
+	}
+
+	String::~String()
+	{
+		BAN::deallocator(m_data);
+	}
+
+	String& String::operator=(const String& other)
+	{
+		MUST(copy_impl(other.sv()));
+		return *this;
+	}
+
+	String& String::operator=(String&& other)
+	{
+		BAN::deallocator(m_data);
+		move_impl(move(other));
+		return *this;
+	}
+
+	String& String::operator=(StringView other)
+	{
+		MUST(copy_impl(other));
+		return *this;
+	}
+
+	ErrorOr<void> String::push_back(char ch)
+	{
+		TRY(ensure_capacity(m_size + 2));
+		m_data[m_size] = ch;
+		m_size++;
+		m_data[m_size] = '\0';
+		return {};
+	}
+
+	ErrorOr<void> String::insert(char ch, size_type index)
+	{
+		ASSERT(index <= m_size);
+		TRY(ensure_capacity(m_size + 1 + 1));
+		memmove(m_data + index + 1, m_data + index, m_size - index);
+		m_data[index] = ch;
+		m_size += 1;
+		m_data[m_size] = '\0';
+		return {};
+	}
+
+	ErrorOr<void> String::insert(StringView other, size_type index)
+	{
+		ASSERT(index <= m_size);
+		TRY(ensure_capacity(m_size + other.size() + 1));
+		memmove(m_data + index + other.size(), m_data + index, m_size - index);
+		memcpy(m_data + index, other.data(), other.size());
+		m_size += other.size();
+		m_data[m_size] = '\0';
+		return {};
+	}
+
+	ErrorOr<void> String::append(StringView other)
+	{
+		TRY(ensure_capacity(m_size + other.size() + 1));
+		memcpy(m_data + m_size, other.data(), other.size());
+		m_size += other.size();
+		m_data[m_size] = '\0';
+		return {};
+	}
+
+	ErrorOr<void> String::append(const String& string)
+	{
+		TRY(append(string.sv()));
+		return {};
+	}
+
+	void String::pop_back()
+	{
+		ASSERT(m_size > 0);
+		m_size--;
+		m_data[m_size] = '\0';
+	}
+
+	void String::remove(size_type index)
+	{
+		erase(index,  1);
+	}
+
+	void String::erase(size_type index, size_type count)
+	{
+		ASSERT(index + count <= m_size);
+		memmove(m_data + index, m_data + index + count, m_size - index - count);
+		m_size -= count;
+		m_data[m_size] = '\0';
+	}
+
+	void String::clear()
+	{
+		m_size = 0;
+		m_data[0] = '\0';
+	}
+
+	char String::operator[](size_type index) const
+	{
+		ASSERT(index < m_size);
+		return m_data[index];
+	}
+
+	char& String::operator[](size_type index)
+	{
+		ASSERT(index < m_size);
+		return m_data[index];
+	}
+
+	bool String::operator==(const String& other) const
+	{
+		if (m_size != other.m_size)
+			return false;
+		return memcmp(m_data, other.m_data, m_size) == 0;
+	}
+
+	bool String::operator==(StringView other) const
+	{
+		if (m_size != other.size())
+			return false;
+		return memcmp(m_data, other.data(), m_size) == 0;
+	}
+
+	bool String::operator==(const char* other) const
+	{
+		for (size_type i = 0; i <= m_size; i++)
+			if (m_data[i] != other[i])
+				return false;
+		return true;
+	}
+
+	ErrorOr<void> String::resize(size_type size, char ch)
+	{
+		if (size < m_size)
+		{
+			m_data[size] = '\0';
+			m_size = size;
+		}
+		else if (size > m_size)
+		{
+			TRY(ensure_capacity(size + 1));
+			for (size_type i = m_size; i < size; i++)
+				m_data[i] = ch;
+			m_data[size] = '\0';
+			m_size = size;
+		}
+		m_size = size;
+		return {};
+	}
+
+	ErrorOr<void> String::reserve(size_type size)
+	{
+		TRY(ensure_capacity(size));
+		return {};
+	}
+
+	ErrorOr<void> String::shrink_to_fit()
+	{
+		size_type temp = m_capacity;
+		m_capacity = 0;
+		auto error_or = ensure_capacity(m_size);
+		if (error_or.is_error())
+		{
+			m_capacity = temp;
+			return error_or;
+		}
+		return {};
+	}
+
+	StringView String::sv() const
+	{
+		return StringView(*this);
+	}
+
+	bool String::empty() const
+	{
+		return m_size == 0;
+	}
+
+	String::size_type String::size() const
+	{
+		return m_size;
+	}
+
+	String::size_type String::capacity() const
+	{
+		return m_capacity;
+	}
+
+	const char* String::data() const
+	{
+		return m_data;
+	}
+
+	ErrorOr<void> String::ensure_capacity(size_type size)
+	{
+		if (m_capacity >= size)
+			return {};
+		size_type new_cap = BAN::Math::max<size_type>(size, m_capacity * 2);
+		void* new_data = BAN::allocator(new_cap);
+		if (new_data == nullptr)
+			return Error::from_errno(ENOMEM);
+		if (m_data)
+			memcpy(new_data, m_data, m_size + 1);
+		BAN::deallocator(m_data);
+		m_data = (char*)new_data;
+		m_capacity = new_cap;
+		return {};
+	}
+
+	ErrorOr<void> String::copy_impl(StringView other)
+	{
+		TRY(ensure_capacity(other.size() + 1));
+		memcpy(m_data, other.data(), other.size());
+		m_size = other.size();
+		m_data[m_size] = '\0';
+		return {};
+	}
+
+	void String::move_impl(String&& other)
+	{
+		m_data		= other.m_data;
+		m_size		= other.m_size;
+		m_capacity	= other.m_capacity;
+
+		other.m_data = nullptr;
+		other.m_size = 0;
+		other.m_capacity = 0;
+	}
+
+}

BAN/BAN/StringView.cpp

@@ -1,11 +1,180 @@
 #include <BAN/String.h>
 #include <BAN/StringView.h>
+#include <BAN/Vector.h>
+
+#include <string.h>
 
 namespace BAN
 {
 
+	StringView::StringView()
+	{ }
+
 	StringView::StringView(const String& other)
 		: StringView(other.data(), other.size())
 	{ }
 
+	StringView::StringView(const char* string, size_type len)
+	{
+		if (len == size_type(-1))
+			len = strlen(string);
+		m_data = string;
+		m_size = len;
+	}
+
+	char StringView::operator[](size_type index) const
+	{
+		ASSERT(index < m_size);
+		return m_data[index];
+	}
+
+	bool StringView::operator==(const String& other) const
+	{
+		if (m_size != other.size())
+			return false;
+		return memcmp(m_data, other.data(), m_size) == 0;
+	}
+
+	bool StringView::operator==(StringView other) const
+	{
+		if (m_size != other.m_size)
+			return false;
+		return memcmp(m_data, other.m_data, m_size) == 0;
+	}
+
+	bool StringView::operator==(const char* other) const
+	{
+		if (memcmp(m_data, other, m_size))
+			return false;
+		return other[m_size] == '\0';
+	}
+
+	StringView StringView::substring(size_type index, size_type len) const
+	{
+		ASSERT(index <= m_size);
+		if (len == size_type(-1))
+			len = m_size - index;
+		ASSERT(len <= m_size - index); // weird order to avoid overflow
+		StringView result;
+		result.m_data = m_data + index;
+		result.m_size = len;
+		return result;
+	}
+
+	ErrorOr<Vector<StringView>> StringView::split(char delim, bool allow_empties)
+	{
+		size_type count = 0;
+		{
+			size_type start = 0;
+			for (size_type i = 0; i < m_size; i++)
+			{
+				if (m_data[i] == delim)
+				{
+					if (allow_empties || start != i)
+						count++;
+					start = i + 1;
+				}
+			}
+			if (start != m_size)
+				count++;
+		}
+
+		Vector<StringView> result;
+		TRY(result.reserve(count));
+
+		size_type start = 0;
+		for (size_type i = 0; i < m_size; i++)
+		{
+			if (m_data[i] == delim)
+			{
+				if (allow_empties || start != i)
+					TRY(result.push_back(this->substring(start, i - start)));
+				start = i + 1;
+			}
+		}
+		if (start != m_size)
+			TRY(result.push_back(this->substring(start)));
+		return result;
+	}
+
+	ErrorOr<Vector<StringView>> StringView::split(bool(*comp)(char), bool allow_empties)
+	{
+		size_type count = 0;
+		{
+			size_type start = 0;
+			for (size_type i = 0; i < m_size; i++)
+			{
+				if (comp(m_data[i]))
+				{
+					if (allow_empties || start != i)
+						count++;
+					start = i + 1;
+				}
+			}
+			if (start != m_size)
+				count++;
+		}
+
+		Vector<StringView> result;
+		TRY(result.reserve(count));
+
+		size_type start = 0;
+		for (size_type i = 0; i < m_size; i++)
+		{
+			if (comp(m_data[i]))
+			{
+				if (allow_empties || start != i)
+					TRY(result.push_back(this->substring(start, i - start)));
+				start = i + 1;
+			}
+		}
+		if (start != m_size)
+			TRY(result.push_back(this->substring(start)));
+		return result;
+	}
+
+	char StringView::back() const
+	{
+		ASSERT(m_size > 0);
+		return m_data[m_size - 1];
+	}
+
+	char StringView::front() const
+	{
+		ASSERT(m_size > 0);
+		return m_data[0];
+	}
+
+	bool StringView::contains(char ch) const
+	{
+		for (size_type i = 0; i < m_size; i++)
+			if (m_data[i] == ch)
+				return true;
+		return false;
+	}
+
+	StringView::size_type StringView::count(char ch) const
+	{
+		size_type result = 0;
+		for (size_type i = 0; i < m_size; i++)
+			if (m_data[i] == ch)
+				result++;
+		return result;
+	}
+
+	bool StringView::empty() const
+	{
+		return m_size == 0;
+	}
+
+	StringView::size_type StringView::size() const
+	{
+		return m_size;
+	}
+
+	const char* StringView::data() const
+	{
+		return m_data;
+	}
+
 }

BAN/CMakeLists.txt

@@ -1,18 +1,26 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(BAN CXX)
+
 set(BAN_SOURCES
-	BAN/Assert.cpp
 	BAN/New.cpp
+	BAN/String.cpp
 	BAN/StringView.cpp
 	BAN/Time.cpp
 )
 
+add_custom_target(ban-headers
+	COMMAND sudo rsync -a ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
+	DEPENDS sysroot
+	USES_TERMINAL
+)
+
 add_library(ban ${BAN_SOURCES})
-target_link_options(ban PRIVATE -nolibc)
+add_dependencies(ban headers libc-install)
-banan_link_library(ban libc)
 
-set_target_properties(ban PROPERTIES OUTPUT_NAME libban)
+add_custom_target(ban-install
-
+	COMMAND sudo cp ${CMAKE_CURRENT_BINARY_DIR}/libban.a ${BANAN_LIB}/
-# set SONAME as cmake doesn't set it for some reason??
+	DEPENDS ban
-set_target_properties(ban PROPERTIES LINK_FLAGS "-Wl,-soname,libban.so")
+	BYPRODUCTS ${BANAN_LIB}/libban.a
-
+	USES_TERMINAL
-banan_install_headers(ban)
+)
-install(TARGETS ban OPTIONAL)

BAN/include/BAN/Array.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <BAN/Errors.h>
 #include <BAN/Iterators.h>
 #include <BAN/Span.h>
 
@@ -18,78 +19,85 @@ namespace BAN
 		using const_iterator = ConstIteratorSimple<T, Array>;
 
 	public:
-		constexpr Array() = default;
+		Array();
-		constexpr Array(const T&);
+		Array(const T&);
 
 		iterator begin() { return iterator(m_data); }
 		iterator end() { return iterator(m_data + size()); }
 		const_iterator begin() const { return const_iterator(m_data); }
 		const_iterator end() const { return const_iterator(m_data + size()); }
 
-		constexpr const T& operator[](size_type) const;
+		const T& operator[](size_type) const;
-		constexpr T& operator[](size_type);
+		T& operator[](size_type);
 
-		constexpr const T& back() const;
+		const T& back() const;
-		constexpr T& back();
+		T& back();
-		constexpr const T& front() const;
+		const T& front() const;
-		constexpr T& front();
+		T& front();
 
 		Span<T> span() { return Span(m_data, size()); }
-		Span<const T> span() const { return Span(m_data, size()); }
+		const Span<T> span() const { return Span(m_data, size()); }
 
 		constexpr size_type size() const;
 		
-		constexpr const T* data() const { return m_data; }
+		const T* data() const { return m_data; }
-		constexpr T* data() { return m_data; }
+		T* data() { return m_data; }
 
 	private:
-		T m_data[S] {};
+		T m_data[S];
 	};
 
 	template<typename T, size_t S>
-	constexpr Array<T, S>::Array(const T& value)
+	Array<T, S>::Array()
+	{
+		for (size_type i = 0; i < S; i++)
+			m_data[i] = T();
+	}
+
+	template<typename T, size_t S>
+	Array<T, S>::Array(const T& value)
 	{
 		for (size_type i = 0; i < S; i++)
 			m_data[i] = value;
 	}
 
 	template<typename T, size_t S>
-	constexpr const T& Array<T, S>::operator[](size_type index) const
+	const T& Array<T, S>::operator[](size_type index) const
 	{
 		ASSERT(index < S);
 		return m_data[index];
 	}
 
 	template<typename T, size_t S>
-	constexpr T& Array<T, S>::operator[](size_type index)
+	T& Array<T, S>::operator[](size_type index)
 	{
 		ASSERT(index < S);
 		return m_data[index];
 	}
 
 	template<typename T, size_t S>
-	constexpr const T& Array<T, S>::back() const
+	const T& Array<T, S>::back() const
 	{
 		ASSERT(S != 0);
 		return m_data[S - 1];
 	}
 
 	template<typename T, size_t S>
-	constexpr T& Array<T, S>::back()
+	T& Array<T, S>::back()
 	{
 		ASSERT(S != 0);
 		return m_data[S - 1];
 	}
 
 	template<typename T, size_t S>
-	constexpr const T& Array<T, S>::front() const
+	const T& Array<T, S>::front() const
 	{
 		ASSERT(S != 0);
 		return m_data[0];
 	}
 
 	template<typename T, size_t S>
-	constexpr T& Array<T, S>::front()
+	T& Array<T, S>::front()
 	{
 		ASSERT(S != 0);
 		return m_data[0];

BAN/include/BAN/Assert.h

@@ -1,14 +1,11 @@
 #pragma once
 
-#define __ban_assert_stringify_helper(s) #s
+#if defined(__is_kernel)
-#define __ban_assert_stringify(s) __ban_assert_stringify_helper(s)
+	#include <kernel/Panic.h>
-
+	#define ASSERT(cond) do { if (!(cond)) Kernel::panic("ASSERT("#cond") failed"); } while (false)
-#define ASSERT(cond)																						\
+	#define ASSERT_NOT_REACHED() Kernel::panic("ASSERT_NOT_REACHED() failed")
-	(__builtin_expect(!(cond), 0)																			\
+#else
-		? __ban_assertion_failed(__FILE__ ":" __ban_assert_stringify(__LINE__), "ASSERT(" #cond ") failed")	\
+	#include <assert.h>
-		: (void)0)
+	#define ASSERT(cond) assert((cond) && "ASSERT("#cond") failed")
-
+	#define ASSERT_NOT_REACHED() do { assert(false && "ASSERT_NOT_REACHED() failed"); __builtin_unreachable(); } while (false)
-#define ASSERT_NOT_REACHED()																				\
+#endif
-	__ban_assertion_failed(__FILE__ ":" __ban_assert_stringify(__LINE__), "ASSERT_NOT_REACHED() reached")
-
-[[noreturn]] void __ban_assertion_failed(const char* location, const char* msg);

BAN/include/BAN/Atomic.h

@@ -1,99 +0,0 @@
-#pragma once
-
-#include <BAN/Traits.h>
-
-namespace BAN
-{
-
-	enum MemoryOrder
-	{
-		memory_order_relaxed = __ATOMIC_RELAXED,
-		memory_order_consume = __ATOMIC_CONSUME,
-		memory_order_acquire = __ATOMIC_ACQUIRE,
-		memory_order_release = __ATOMIC_RELEASE,
-		memory_order_acq_rel = __ATOMIC_ACQ_REL,
-		memory_order_seq_cst = __ATOMIC_SEQ_CST,
-	};
-
-	template<typename T> concept atomic_c = is_integral_v<T> || is_pointer_v<T>;
-	template<typename T> concept atomic_lockfree_c = (is_integral_v<T> || is_pointer_v<T>) && __atomic_always_lock_free(sizeof(T), 0);
-
-	template<atomic_lockfree_c T, atomic_c U>
-	inline void atomic_store(T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { __atomic_store_n(&obj, value, mem_order); }
-	template<atomic_lockfree_c T>
-	inline T atomic_load(T& obj, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_load_n(&obj, mem_order); }
-
-	template<atomic_lockfree_c T, atomic_c U>
-	inline T atomic_exchange(T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_exchange_n(&obj, value, mem_order); }
-	template<atomic_lockfree_c T, atomic_lockfree_c U, atomic_c V>
-	inline bool atomic_compare_exchange(T& obj, U& expected, V value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_compare_exchange_n(&obj, &expected, value, false, mem_order, mem_order); }
-
-#define DECL_ATOMIC_INLINE template<atomic_lockfree_c T, atomic_c U> inline
-	DECL_ATOMIC_INLINE T atomic_add_fetch (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_add_fetch (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_sub_fetch (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_sub_fetch (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_and_fetch (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_and_fetch (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_xor_fetch (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_xor_fetch (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_or_fetch  (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_or_fetch  (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_nand_fetch(T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_nand_fetch(&obj, value, mem_order); }
-
-	DECL_ATOMIC_INLINE T atomic_fetch_add (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_fetch_add (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_fetch_sub (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_fetch_sub (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_fetch_and (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_fetch_and (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_fetch_xor (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_fetch_xor (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_fetch_or  (T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_fetch_or  (&obj, value, mem_order); }
-	DECL_ATOMIC_INLINE T atomic_fetch_nand(T& obj, U value, MemoryOrder mem_order = MemoryOrder::memory_order_seq_cst) { return __atomic_fetch_nand(&obj, value, mem_order); }
-#undef DECL_ATOMIC_INLINE
-
-	template<atomic_lockfree_c T, MemoryOrder MEM_ORDER = MemoryOrder::memory_order_seq_cst>
-	class Atomic
-	{
-		Atomic(const Atomic&) = delete;
-		Atomic(Atomic&&) = delete;
-		Atomic& operator=(const Atomic&) volatile = delete;
-		Atomic& operator=(Atomic&&) volatile = delete;
-
-	public:
-		constexpr Atomic() : m_value(0) {}
-		constexpr Atomic(T val) : m_value(val) {}
-
-		inline T load(MemoryOrder mem_order = MEM_ORDER) const volatile			{ return atomic_load(m_value, mem_order); }
-		inline void store(T val, MemoryOrder mem_order = MEM_ORDER) volatile	{ atomic_store(m_value, val, mem_order); }
-
-		inline T operator=(T val) volatile { store(val); return val; }
-
-		inline operator T() const volatile { return load(); }
-
-		inline T operator+=(T val) volatile { return atomic_add_fetch(m_value, val, MEM_ORDER); }
-		inline T operator-=(T val) volatile { return atomic_sub_fetch(m_value, val, MEM_ORDER); }
-		inline T operator&=(T val) volatile { return atomic_and_fetch(m_value, val, MEM_ORDER); }
-		inline T operator^=(T val) volatile { return atomic_xor_fetch(m_value, val, MEM_ORDER); }
-		inline T operator|=(T val) volatile { return atomic_or_fetch(m_value, val, MEM_ORDER); }
-
-		inline T operator--() volatile { return atomic_sub_fetch(m_value, 1, MEM_ORDER); }
-		inline T operator++() volatile { return atomic_add_fetch(m_value, 1, MEM_ORDER); }
-
-		inline T operator--(int) volatile { return atomic_fetch_sub(m_value, 1, MEM_ORDER); }
-		inline T operator++(int) volatile { return atomic_fetch_add(m_value, 1, MEM_ORDER); }
-
-		inline bool compare_exchange(T& expected, T desired, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_compare_exchange(m_value, expected, desired, mem_order); }
-		inline T exchange(T desired, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_exchange(m_value, desired, mem_order); };
-
-		inline T add_fetch (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_add_fetch (m_value, val, mem_order); }
-		inline T sub_fetch (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_sub_fetch (m_value, val, mem_order); }
-		inline T and_fetch (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_and_fetch (m_value, val, mem_order); }
-		inline T xor_fetch (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_xor_fetch (m_value, val, mem_order); }
-		inline T or_fetch  (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_or_fetch  (m_value, val, mem_order); }
-		inline T nand_fetch(T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_nand_fetch(m_value, val, mem_order); }
-
-		inline T fetch_add (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_fetch_add (m_value, val, mem_order); }
-		inline T fetch_sub (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_fetch_sub (m_value, val, mem_order); }
-		inline T fetch_and (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_fetch_and (m_value, val, mem_order); }
-		inline T fetch_xor (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_fetch_xor (m_value, val, mem_order); }
-		inline T fetch_or  (T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_fetch_or  (m_value, val, mem_order); }
-		inline T fetch_nand(T val, MemoryOrder mem_order = MEM_ORDER) volatile { return atomic_fetch_nand(m_value, val, mem_order); }
-
-	private:
-		T m_value;
-	};
-
-}

BAN/include/BAN/Bitcast.h

@@ -1,12 +0,0 @@
-#pragma once
-
-namespace BAN
-{
-
-	template<typename To, typename From>
-	constexpr To bit_cast(const From& from)
-	{
-		return __builtin_bit_cast(To, from);
-	}
-
-}

BAN/include/BAN/ByteSpan.h

@@ -1,124 +0,0 @@
-#pragma once
-
-#include <BAN/Span.h>
-
-#include <stdint.h>
-
-namespace BAN
-{
-
-	template<bool CONST>
-	class ByteSpanGeneral
-	{
-	public:
-		using value_type = maybe_const_t<CONST, uint8_t>;
-		using size_type = size_t;
-
-	public:
-		ByteSpanGeneral() = default;
-		ByteSpanGeneral(value_type* data, size_type size)
-			: m_data(data)
-			, m_size(size)
-		{ }
-
-		template<bool SRC_CONST>
-		ByteSpanGeneral(const ByteSpanGeneral<SRC_CONST>& other) requires(CONST || !SRC_CONST)
-			: m_data(other.data())
-			, m_size(other.size())
-		{ }
-		template<bool SRC_CONST>
-		ByteSpanGeneral(ByteSpanGeneral<SRC_CONST>&& other) requires(CONST || !SRC_CONST)
-			: m_data(other.data())
-			, m_size(other.size())
-		{
-			other.clear();
-		}
-
-		template<typename T>
-		ByteSpanGeneral(const Span<T>& other) requires(is_same_v<T, uint8_t> || (is_same_v<T, const uint8_t> && CONST))
-			: m_data(other.data())
-			, m_size(other.size())
-		{ }
-		template<typename T>
-		ByteSpanGeneral(Span<T>&& other) requires(is_same_v<T, uint8_t> || (is_same_v<T, const uint8_t> && CONST))
-			: m_data(other.data())
-			, m_size(other.size())
-		{
-			other.clear();
-		}
-
-		template<bool SRC_CONST>
-		ByteSpanGeneral& operator=(const ByteSpanGeneral<SRC_CONST>& other) requires(CONST || !SRC_CONST)
-		{
-			m_data = other.data();
-			m_size = other.size();
-			return *this;
-		}
-		template<bool SRC_CONST>
-		ByteSpanGeneral& operator=(ByteSpanGeneral<SRC_CONST>&& other) requires(CONST || !SRC_CONST)
-		{
-			m_data = other.data();
-			m_size = other.size();
-			other.clear();
-			return *this;
-		}
-
-		template<typename S>
-		static ByteSpanGeneral from(S& value) requires(CONST || !is_const_v<S>)
-		{
-			return ByteSpanGeneral(reinterpret_cast<value_type*>(&value), sizeof(S));
-		}
-
-		template<typename S>
-		S& as() const requires(!CONST || is_const_v<S>)
-		{
-			ASSERT(m_data);
-			ASSERT(m_size >= sizeof(S));
-			return *reinterpret_cast<S*>(m_data);
-		}
-
-		template<typename S>
-		Span<S> as_span() const requires(!CONST || is_const_v<S>)
-		{
-			ASSERT(m_data);
-			return Span<S>(reinterpret_cast<S*>(m_data), m_size / sizeof(S));
-		}
-
-		[[nodiscard]] ByteSpanGeneral slice(size_type offset, size_type length = size_type(-1)) const
-		{
-			ASSERT(m_data);
-			ASSERT(m_size >= offset);
-			if (length == size_type(-1))
-				length = m_size - offset;
-			ASSERT(m_size >= offset + length);
-			return ByteSpanGeneral(m_data + offset, length);
-		}
-
-		value_type& operator[](size_type offset) const
-		{
-			ASSERT(offset < m_size);
-			return m_data[offset];
-		}
-
-		value_type* data() const { return m_data; }
-
-		bool empty() const { return m_size == 0; }
-		size_type size() const { return m_size; }
-
-		void clear()
-		{
-			m_data = nullptr;
-			m_size = 0;
-		}
-
-	private:
-		value_type* m_data { nullptr };
-		size_type m_size { 0 };
-
-		friend class ByteSpanGeneral<!CONST>;
-	};
-
-	using ByteSpan = ByteSpanGeneral<false>;
-	using ConstByteSpan = ByteSpanGeneral<true>;
-
-}

BAN/include/BAN/CircularQueue.h

@@ -1,8 +1,6 @@
 #pragma once
 
 #include <BAN/Assert.h>
-#include <BAN/Move.h>
-#include <BAN/PlacementNew.h>
 
 #include <stdint.h>
 #include <stddef.h>
@@ -24,21 +22,13 @@ namespace BAN
 		void push(const T&);
 		void push(T&&);
 		template<typename... Args>
-		void emplace(Args&&... args) requires is_constructible_v<T, Args...>;
+		void emplace(Args&&... args);
 
 		void pop();
 
 		const T& front() const;
 		T& front();
 
-		const T& back() const;
-		T& back();
-
-		const T& operator[](size_t index) const;
-		T& operator[](size_t index);
-
-		void clear();
-
 		size_type size() const { return m_size; }
 		bool empty() const { return size() == 0; }
 		bool full() const { return size() == capacity(); }
@@ -58,7 +48,8 @@ namespace BAN
 	template<typename T, size_t S>
 	CircularQueue<T, S>::~CircularQueue()
 	{
-		clear();
+		for (size_type i = 0; i < m_size; i++)
+			element_at((m_first + i) % capacity())->~T();
 	}
 
 	template<typename T, size_t S>
@@ -75,7 +66,7 @@ namespace BAN
 
 	template<typename T, size_t S>
 	template<typename... Args>
-	void CircularQueue<T, S>::emplace(Args&&... args) requires is_constructible_v<T, Args...>
+	void CircularQueue<T, S>::emplace(Args&&... args)
 	{
 		ASSERT(!full());
 		new (element_at(((m_first + m_size) % capacity()))) T(BAN::forward<Args>(args)...);
@@ -105,42 +96,6 @@ namespace BAN
 		return *element_at(m_first);
 	}
 
-	template<typename T, size_t S>
-	const T& CircularQueue<T, S>::back() const
-	{
-		ASSERT(!empty());
-		return *element_at((m_first + m_size - 1) % capacity());
-	}
-
-	template<typename T, size_t S>
-	T& CircularQueue<T, S>::back()
-	{
-		ASSERT(!empty());
-		return *element_at((m_first + m_size - 1) % capacity());
-	}
-
-	template<typename T, size_t S>
-	const T& CircularQueue<T, S>::operator[](size_t index) const
-	{
-		ASSERT(index < m_size);
-		return *element_at((m_first + index) % capacity());
-	}
-
-	template<typename T, size_t S>
-	T& CircularQueue<T, S>::operator[](size_t index)
-	{
-		ASSERT(index < m_size);
-		return *element_at((m_first + index) % capacity());
-	}
-
-	template<typename T, size_t S>
-	void CircularQueue<T, S>::clear()
-	{
-		for (size_type i = 0; i < m_size; i++)
-			element_at((m_first + i) % capacity())->~T();
-		m_size = 0;
-	}
-
 	template<typename T, size_t S>
 	const T* CircularQueue<T, S>::element_at(size_type index) const
 	{

BAN/include/BAN/Debug.h

@@ -1,61 +0,0 @@
-#pragma once
-
-#if __is_kernel
-
-#include <kernel/Debug.h>
-
-#else
-
-#include <BAN/Formatter.h>
-#include <stdio.h>
-
-#define __debug_putchar [](int c) { putc_unlocked(c, stddbg); }
-
-#define dprintln(...)											\
-	do {														\
-		flockfile(stddbg);										\
-		BAN::Formatter::print(__debug_putchar, __VA_ARGS__);	\
-		BAN::Formatter::print(__debug_putchar,"\n");			\
-		fflush(stddbg);											\
-		funlockfile(stddbg);									\
-	} while (false)
-
-#define dwarnln(...)											\
-	do {														\
-		flockfile(stddbg);										\
-		BAN::Formatter::print(__debug_putchar, "\e[33m");		\
-		BAN::Formatter::print(__debug_putchar, __VA_ARGS__);	\
-		BAN::Formatter::print(__debug_putchar, "\e[m\n");		\
-		fflush(stddbg);											\
-		funlockfile(stddbg);									\
-	} while(false)
-
-#define derrorln(...)											\
-	do {														\
-		flockfile(stddbg);										\
-		BAN::Formatter::print(__debug_putchar, "\e[31m");		\
-		BAN::Formatter::print(__debug_putchar, __VA_ARGS__);	\
-		BAN::Formatter::print(__debug_putchar, "\e[m\n");		\
-		fflush(stddbg);											\
-		funlockfile(stddbg);									\
-	} while(false)
-
-#define dprintln_if(cond, ...)		\
-	do {							\
-		if constexpr(cond)			\
-			dprintln(__VA_ARGS__);	\
-	} while(false)
-
-#define dwarnln_if(cond, ...)		\
-	do {							\
-		if constexpr(cond)			\
-			dwarnln(__VA_ARGS__);	\
-	} while(false)
-
-#define derrorln_if(cond, ...)		\
-	do {							\
-		if constexpr(cond)			\
-			derrorln(__VA_ARGS__);	\
-	} while(false)
-
-#endif

BAN/include/BAN/Endianness.h

@@ -45,12 +45,6 @@ namespace BAN
 #endif
 	}
 
-	template<integral T>
-	constexpr T little_endian_to_host(T value)
-	{
-		return host_to_little_endian(value);
-	}
-
 	template<integral T>
 	constexpr T host_to_big_endian(T value)
 	{
@@ -61,28 +55,13 @@ namespace BAN
 #endif
 	}
 
-	template<integral T>
-	constexpr T big_endian_to_host(T value)
-	{
-		return host_to_big_endian(value);
-	}
-
 	template<integral T>
 	struct LittleEndian
 	{
-		constexpr LittleEndian()
-			: raw(0)
-		{ }
-
-		constexpr LittleEndian(T value)
-			: raw(host_to_little_endian(value))
-		{ }
-
 		constexpr operator T() const
 		{
 			return host_to_little_endian(raw);
 		}
-
 	private:
 		T raw;
 	};
@@ -90,36 +69,12 @@ namespace BAN
 	template<integral T>
 	struct BigEndian
 	{
-		constexpr BigEndian()
-			: raw(0)
-		{ }
-
-		constexpr BigEndian(T value)
-			: raw(host_to_big_endian(value))
-		{ }
-
 		constexpr operator T() const
 		{
 			return host_to_big_endian(raw);
 		}
-
 	private:
 		T raw;
 	};
 
-	template<integral T>
-	using NetworkEndian = BigEndian<T>;
-
-	template<integral T>
-	constexpr T host_to_network_endian(T value)
-	{
-		return host_to_big_endian(value);
-	}
-
-	template<integral T>
-	constexpr T network_endian_to_host(T value)
-	{
-		return big_endian_to_host(value);
-	}
-
 }

BAN/include/BAN/Errors.h

@@ -1,7 +1,7 @@
 #pragma once
 
 #include <BAN/Formatter.h>
-#include <BAN/NoCopyMove.h>
+#include <BAN/StringView.h>
 #include <BAN/Variant.h>
 
 #include <errno.h>
@@ -10,16 +10,16 @@
 #ifdef __is_kernel
 	#include <kernel/Panic.h>
 	#include <kernel/Errors.h>
-	#define MUST(...)		 ({ auto&& e = (__VA_ARGS__); if (e.is_error()) Kernel::panic("{}", e.error()); e.release_value(); })
+	#define MUST(expr)		 ({ auto&& e = expr; if (e.is_error()) Kernel::panic("{}", e.error()); e.release_value(); })
-	#define MUST_REF(...)	*({ auto&& e = (__VA_ARGS__); if (e.is_error()) Kernel::panic("{}", e.error()); &e.release_value(); })
+	#define MUST_REF(expr)	*({ auto&& e = expr; if (e.is_error()) Kernel::panic("{}", e.error()); &e.release_value(); })
 #else
-	#include <BAN/Debug.h>
+	#include <assert.h>
-	#define MUST(...)		 ({ auto&& e = (__VA_ARGS__); if (e.is_error()) { derrorln("MUST(" #__VA_ARGS__ "): {}", e.error()); __builtin_trap(); } e.release_value(); })
+	#define MUST(expr)		 ({ auto&& e = expr; assert(!e.is_error()); e.release_value(); })
-	#define MUST_REF(...)	*({ auto&& e = (__VA_ARGS__); if (e.is_error()) { derrorln("MUST(" #__VA_ARGS__ "): {}", e.error()); __builtin_trap(); } &e.release_value(); })
+	#define MUST_REF(expr)	*({ auto&& e = expr; assert(!e.is_error()); &e.release_value(); })
 #endif
 
-#define TRY(...)		 ({ auto&& e = (__VA_ARGS__); if (e.is_error()) return e.release_error(); e.release_value(); })
+#define TRY(expr)		 ({ auto&& e = expr; if (e.is_error()) return e.release_error(); e.release_value(); })
-#define TRY_REF(...)	*({ auto&& e = (__VA_ARGS__); if (e.is_error()) return e.release_error(); &e.release_value(); })
+#define TRY_REF(expr)	*({ auto&& e = expr; if (e.is_error()) return e.release_error(); &e.release_value(); })
 
 namespace BAN
 {
@@ -37,14 +37,7 @@ namespace BAN
 		{
 			return Error((uint64_t)error | kernel_error_mask);
 		}
-#else
-		template<size_t N>
-		consteval static Error from_literal(const char (&message)[N])
-		{
-			return Error(message);
-		}
 #endif
-
 		static Error from_errno(int error)
 		{
 			return Error(error);
@@ -62,43 +55,27 @@ namespace BAN
 		}
 #endif
 
-		constexpr uint64_t get_error_code() const { return m_error_code; }
+		uint64_t get_error_code() const { return m_error_code; }
-		const char* get_message() const
+		BAN::StringView get_message() const
 		{
 #ifdef __is_kernel
 			if (m_error_code & kernel_error_mask)
 				return Kernel::error_string(kernel_error());
-#else
-			if (m_message)
-				return m_message;
 #endif
-			if (auto* desc = strerrordesc_np(m_error_code))
+			return strerror(m_error_code);
-				return desc;
-			return "Unknown error";
 		}
 
 	private:
-		constexpr Error(uint64_t error)
+		Error(uint64_t error)
 			: m_error_code(error)
 		{}
 
-#ifndef __is_kernel
+		uint64_t m_error_code;
-		constexpr Error(const char* message)
-			: m_message(message)
-		{}
-#endif
-
-		uint64_t m_error_code { 0 };
-
-#ifndef __is_kernel
-		const char* m_message { nullptr };
-#endif
 	};
 
 	template<typename T>
 	class [[nodiscard]] ErrorOr
 	{
-		BAN_NON_COPYABLE(ErrorOr);
 	public:
 		ErrorOr(const T& value)
 			: m_data(value)
@@ -112,14 +89,6 @@ namespace BAN
 		ErrorOr(Error&& error)
 			: m_data(move(error))
 		{}
-		ErrorOr(ErrorOr&& other)
-			: m_data(move(other.m_data))
-		{}
-		ErrorOr& operator=(ErrorOr&& other)
-		{
-			m_data = move(other.m_data);
-			return *this;
-		}
 
 		bool is_error() const			{ return m_data.template has<Error>(); }
 		const Error& error() const		{ return m_data.template get<Error>(); }

BAN/include/BAN/Formatter.h

@@ -10,19 +10,22 @@ namespace BAN::Formatter
 
 	struct ValueFormat;
 
+	template<typename F>
+	static void print(F putc, const char* format);
+
+	template<typename F, typename Arg, typename... Args>
+	static void print(F putc, const char* format, Arg&& arg, Args&&... args);
+
 	template<typename F, typename... Args>
-	concept PrintableArguments = requires(F putc, Args&&... args, const ValueFormat& format)
+	static void println(F putc, const char* format, Args&&... args);
-	{
-		(print_argument(putc, BAN::forward<Args>(args), format), ...);
-	};
 
 	template<typename F, typename T>
-	inline void print_argument(F putc, T value, const ValueFormat& format);
+	static void print_argument(F putc, T value, const ValueFormat& format);
 
 	namespace detail
 	{
 		template<typename F, typename T>
-		inline size_t parse_format_and_print_argument(F putc, const char* format, T&& arg);
+		static size_t parse_format_and_print_argument(F putc, const char* format, T&& arg);
 	}
 
 	/*
@@ -36,12 +39,11 @@ namespace BAN::Formatter
 		int base		= 10;
 		int percision	= 3;
 		int fill		= 0;
-		char fill_char  = '0';
 		bool upper		= false;
 	};
 
 	template<typename F>
-	inline void print(F putc, const char* format)
+	void print(F putc, const char* format)
 	{
 		while (*format)
 		{
@@ -50,8 +52,8 @@ namespace BAN::Formatter
 		}
 	}
 
-	template<typename F, typename Arg, typename... Args> requires PrintableArguments<F, Arg, Args...>
+	template<typename F, typename Arg, typename... Args>
-	inline void print(F putc, const char* format, Arg&& arg, Args&&... args)
+	void print(F putc, const char* format, Arg&& arg, Args&&... args)
 	{
 		while (*format && *format != '{')
 		{
@@ -69,7 +71,7 @@ namespace BAN::Formatter
 	}
 
 	template<typename F, typename... Args>
-	inline void println(F putc, const char* format, Args&&... args)
+	void println(F putc, const char* format, Args&&... args)
 	{
 		print(putc, format, args...);
 		putc('\n');
@@ -79,7 +81,7 @@ namespace BAN::Formatter
 	{
 
 		template<typename F, typename Arg>
-		inline size_t parse_format_and_print_argument(F putc, const char* format, Arg&& argument)
+		size_t parse_format_and_print_argument(F putc, const char* format, Arg&& argument)
 		{
 			ValueFormat value_format;
 
@@ -92,12 +94,6 @@ namespace BAN::Formatter
 				if (!format[i] || format[i] == '}')
 					break;
 
-				if (format[i] == ' ')
-				{
-					value_format.fill_char = ' ';
-					i++;
-				}
-
 				if ('0' <= format[i] && format[i] <= '9')
 				{
 					int fill = 0;
@@ -147,7 +143,7 @@ namespace BAN::Formatter
 			return i + 1;
 		}
 
-		inline char value_to_base_char(uint8_t value, int base, bool upper)
+		static char value_to_base_char(uint8_t value, int base, bool upper)
 		{
 			if (base <= 10)
 				return value + '0';
@@ -161,12 +157,11 @@ namespace BAN::Formatter
 		}
 
 		template<typename F, typename T>
-		inline void print_integer(F putc, T value, const ValueFormat& format)
+		void print_integer(F putc, T value, const ValueFormat& format)
 		{
 			if (value == 0)
 			{
-				for (int i = 0; i < format.fill - 1; i++)
+				for (int i = 0; i < format.fill || i < 1; i++)
-					putc(format.fill_char);
 					putc('0');
 				return;
 			}
@@ -193,7 +188,7 @@ namespace BAN::Formatter
 			}
 
 			while (ptr >= buffer + sizeof(buffer) - format.fill)
-				*(--ptr) = format.fill_char;
+				*(--ptr) = '0';
 
 			if (sign)
 				*(--ptr) = '-';
@@ -202,16 +197,12 @@ namespace BAN::Formatter
 		}
 
 		template<typename F, typename T>
-		inline void print_floating(F putc, T value, const ValueFormat& format)
+		void print_floating(F putc, T value, const ValueFormat& format)
 		{
-			if (value < 0)
-			{
-				putc('-');
-				return print_floating(putc, -value, format);
-			}
-
 			int64_t int_part = (int64_t)value;
 			T frac_part = value - (T)int_part;
+			if (frac_part < 0)
+				frac_part = -frac_part;
 
 			print_integer(putc, int_part, format);
 			
@@ -229,7 +220,7 @@ namespace BAN::Formatter
 		}
 
 		template<typename F>
-		inline void print_pointer(F putc, void* ptr, const ValueFormat& format)
+		void print_pointer(F putc, void* ptr, const ValueFormat& format)
 		{
 			uintptr_t value = (uintptr_t)ptr;
 			print(putc, "0x");
@@ -245,13 +236,13 @@ namespace BAN::Formatter
 
 	*/
 
-	template<typename F, integral		T> inline void print_argument(F putc, T value, const ValueFormat& format) { detail::print_integer(putc, value, format); }
+	template<typename F, integral		T> void print_argument(F putc, T value, const ValueFormat& format) { detail::print_integer(putc, value, format); }
-	template<typename F, floating_point	T> inline void print_argument(F putc, T value, const ValueFormat& format) { detail::print_floating(putc, value, format); }
+	template<typename F, floating_point	T> void print_argument(F putc, T value, const ValueFormat& format) { detail::print_floating(putc, value, format); }
-	template<typename F, pointer		T> inline void print_argument(F putc, T value, const ValueFormat& format) { detail::print_pointer(putc, (void*)value, format); }
+	template<typename F, pointer		T> void print_argument(F putc, T value, const ValueFormat& format) { detail::print_pointer(putc, (void*)value, format); }
 
-	template<typename F> inline void print_argument(F putc, char			value, const ValueFormat&)	{ putc(value); }
+	template<typename F> void print_argument(F putc, char			value, const ValueFormat&)	{ putc(value); }
-	template<typename F> inline void print_argument(F putc, bool			value, const ValueFormat&)	{ print(putc, value ? "true" : "false"); }
+	template<typename F> void print_argument(F putc, bool			value, const ValueFormat&)	{ print(putc, value ? "true" : "false"); }
-	template<typename F> inline void print_argument(F putc, const char*	value, const ValueFormat&)	{ print(putc, value); }
+	template<typename F> void print_argument(F putc, const char*	value, const ValueFormat&)	{ print(putc, value); }
-	template<typename F> inline void print_argument(F putc, char*			value, const ValueFormat&)	{ print(putc, value); }
+	template<typename F> void print_argument(F putc, char*			value, const ValueFormat&)	{ print(putc, value); }
 
 }

BAN/include/BAN/ForwardList.h

@@ -1,6 +1,5 @@
 #pragma once
 
-#include <BAN/Traits.h>
 #include <stddef.h>
 
 namespace BAN
@@ -15,6 +14,5 @@ namespace BAN
 	class StringView;
 	template<typename> class Vector;
 	template<typename> class LinkedList;
-	template<typename... Ts> requires (!is_const_v<Ts> && ...) class Variant;
 
 }

BAN/include/BAN/Function.h

@@ -2,7 +2,7 @@
 
 #include <BAN/Errors.h>
 #include <BAN/Move.h>
-#include <BAN/PlacementNew.h>
+#include <BAN/New.h>
 
 namespace BAN
 {
@@ -20,19 +20,19 @@ namespace BAN
 			new (m_storage) CallablePointer(function);
 		}
 		template<typename Own>
-		Function(Ret(Own::*function)(Args...), Own& owner)
+		Function(Ret(Own::*function)(Args...), Own* owner)
 		{
 			static_assert(sizeof(CallableMember<Own>) <= m_size);
 			new (m_storage) CallableMember<Own>(function, owner);
 		}
 		template<typename Own>
-		Function(Ret(Own::*function)(Args...) const, const Own& owner)
+		Function(Ret(Own::*function)(Args...) const, const Own* owner)
 		{
 			static_assert(sizeof(CallableMemberConst<Own>) <= m_size);
 			new (m_storage) CallableMemberConst<Own>(function, owner);
 		}
 		template<typename Lambda>
-		Function(Lambda lambda) requires requires(Lambda lamda, Args&&... args) { { lambda(forward<Args>(args)...) } -> BAN::same_as<Ret>; }
+		Function(Lambda lambda)
 		{
 			static_assert(sizeof(CallableLambda<Lambda>) <= m_size);
 			new (m_storage) CallableLambda<Lambda>(lambda);
@@ -91,36 +91,36 @@ namespace BAN
 		template<typename Own>
 		struct CallableMember : public CallableBase
 		{
-			CallableMember(Ret(Own::*function)(Args...), Own& owner)
+			CallableMember(Ret(Own::*function)(Args...), Own* owner)
 				: m_owner(owner)
 				, m_function(function)
 			{ }
 
 			virtual Ret call(Args... args) const override
 			{
-				return (m_owner.*m_function)(forward<Args>(args)...);
+				return (m_owner->*m_function)(forward<Args>(args)...);
 			}
 
 		private:
-			Own& m_owner;
+			Own* m_owner = nullptr;
 			Ret(Own::*m_function)(Args...) = nullptr;
 		};
 
 		template<typename Own>
 		struct CallableMemberConst : public CallableBase
 		{
-			CallableMemberConst(Ret(Own::*function)(Args...) const, const Own& owner)
+			CallableMemberConst(Ret(Own::*function)(Args...) const, const Own* owner)
 				: m_owner(owner)
 				, m_function(function)
 			{ }
 
 			virtual Ret call(Args... args) const override
 			{
-				return (m_owner.*m_function)(forward<Args>(args)...);
+				return (m_owner->*m_function)(forward<Args>(args)...);
 			}
 
 		private:
-			const Own& m_owner;
+			const Own* m_owner = nullptr;
 			Ret(Own::*m_function)(Args...) const = nullptr;
 		};
 
@@ -141,7 +141,7 @@ namespace BAN
 		};
 
 	private:
-		static constexpr size_t m_size = sizeof(void*) * 8;
+		static constexpr size_t m_size = sizeof(void*) * 5;
 		alignas(CallableBase) uint8_t m_storage[m_size] { 0 };
 	};
 

BAN/include/BAN/GUID.h

@@ -1,73 +0,0 @@
-#pragma once
-
-#include <BAN/Optional.h>
-#include <BAN/String.h>
-
-#include <string.h>
-
-namespace BAN
-{
-
-	struct GUID
-	{
-		uint32_t component1		{ 0 };
-		uint16_t component2		{ 0 };
-		uint16_t component3		{ 0 };
-		uint8_t component45[8]	{   };
-
-		bool operator==(const GUID& other) const
-		{
-			return memcmp(this, &other, sizeof(GUID)) == 0;
-		}
-
-		BAN::ErrorOr<BAN::String> to_string() const
-		{
-			char buffer[37];
-			char* ptr = buffer;
-
-			const auto append_hex_nibble =
-				[&ptr](uint8_t nibble)
-				{
-					if (nibble < 10)
-						*ptr++ = '0' + nibble;
-					else
-						*ptr++ = 'A' + nibble - 10;
-				};
-
-			const auto append_hex_byte =
-				[&append_hex_nibble](uint8_t byte)
-				{
-					append_hex_nibble(byte >> 4);
-					append_hex_nibble(byte & 0xF);
-				};
-
-			append_hex_byte((component1 >> 24) & 0xFF);
-			append_hex_byte((component1 >> 16) & 0xFF);
-			append_hex_byte((component1 >>  8) & 0xFF);
-			append_hex_byte((component1 >>  0) & 0xFF);
-			*ptr++ = '-';
-			append_hex_byte((component2 >>  8) & 0xFF);
-			append_hex_byte((component2 >>  0) & 0xFF);
-			*ptr++ = '-';
-			append_hex_byte((component3 >>  8) & 0xFF);
-			append_hex_byte((component3 >>  0) & 0xFF);
-			*ptr++ = '-';
-			append_hex_byte(component45[0]);
-			append_hex_byte(component45[1]);
-			*ptr++ = '-';
-			append_hex_byte(component45[2]);
-			append_hex_byte(component45[3]);
-			append_hex_byte(component45[4]);
-			append_hex_byte(component45[5]);
-			append_hex_byte(component45[6]);
-			append_hex_byte(component45[7]);
-			*ptr = '\0';
-
-			BAN::String guid;
-			TRY(guid.append(buffer));
-			return BAN::move(guid);
-		}
-	};
-	static_assert(sizeof(GUID) == 16);
-
-}

BAN/include/BAN/HashMap.h

@@ -7,6 +7,9 @@
 namespace BAN
 {
 
+	template<typename Container>
+	class HashMapIterator;
+
 	template<typename Key, typename T, typename HASH = BAN::hash<Key>>
 	class HashMap
 	{
@@ -14,17 +17,11 @@ namespace BAN
 		struct Entry
 		{
 			template<typename... Args>
-			Entry(const Key& key, Args&&... args) requires is_constructible_v<T, Args...>
+			Entry(const Key& key, Args&&... args)
 				: key(key)
 				, value(forward<Args>(args)...)
 			{}
 
-			template<typename... Args>
-			Entry(Key&& key, Args&&... args) requires is_constructible_v<T, Args...>
-				: key(BAN::move(key))
-				, value(forward<Args>(args)...)
-			{}
-
 			Key key;
 			T value;
 		};
@@ -45,27 +42,10 @@ namespace BAN
 		HashMap<Key, T, HASH>& operator=(const HashMap<Key, T, HASH>&);
 		HashMap<Key, T, HASH>& operator=(HashMap<Key, T, HASH>&&);
 
-		ErrorOr<iterator> insert(const Key& key, const T& value)           { return emplace(key, value); }
+		ErrorOr<void> insert(const Key&, const T&);
-		ErrorOr<iterator> insert(const Key& key, T&& value)                { return emplace(key, move(value)); }
+		ErrorOr<void> insert(const Key&, T&&);
-		ErrorOr<iterator> insert(Key&& key, const T& value)                { return emplace(move(key), value); }
-		ErrorOr<iterator> insert(Key&& key, T&& value)                     { return emplace(move(key), move(value)); }
-
-		ErrorOr<iterator> insert_or_assign(const Key& key, const T& value) { return emplace_or_assign(key, value); }
-		ErrorOr<iterator> insert_or_assign(const Key& key, T&& value)      { return emplace_or_assign(key, move(value)); }
-		ErrorOr<iterator> insert_or_assign(Key&& key, const T& value)      { return emplace_or_assign(move(key), value); }
-		ErrorOr<iterator> insert_or_assign(Key&& key, T&& value)           { return emplace_or_assign(move(key), move(value)); }
-
 		template<typename... Args>
-		ErrorOr<iterator> emplace(const Key& key, Args&&... args) requires is_constructible_v<T, Args...>
+		ErrorOr<void> emplace(const Key&, Args&&...);
-		{ return emplace(Key(key), forward<Args>(args)...); }
-		template<typename... Args>
-		ErrorOr<iterator> emplace(Key&&, Args&&...) requires is_constructible_v<T, Args...>;
-
-		template<typename... Args>
-		ErrorOr<iterator> emplace_or_assign(const Key& key, Args&&... args) requires is_constructible_v<T, Args...>
-		{ return emplace_or_assign(Key(key), forward<Args>(args)...); }
-		template<typename... Args>
-		ErrorOr<iterator> emplace_or_assign(Key&&, Args&&...) requires is_constructible_v<T, Args...>;
 
 		iterator begin() { return iterator(m_buckets.end(), m_buckets.begin()); }
 		iterator end()   { return iterator(m_buckets.end(), m_buckets.end()); }
@@ -75,14 +55,11 @@ namespace BAN
 		ErrorOr<void> reserve(size_type);
 
 		void remove(const Key&);
-		void remove(iterator it);
 		void clear();
 
 		T& operator[](const Key&);
 		const T& operator[](const Key&) const;
 
-		iterator find(const Key& key);
-		const_iterator find(const Key& key) const;
 		bool contains(const Key&) const;
 
 		bool empty() const;
@@ -92,8 +69,6 @@ namespace BAN
 		ErrorOr<void> rebucket(size_type);
 		LinkedList<Entry>& get_bucket(const Key&);
 		const LinkedList<Entry>& get_bucket(const Key&) const;
-		Vector<LinkedList<Entry>>::iterator get_bucket_iterator(const Key&);
-		Vector<LinkedList<Entry>>::const_iterator get_bucket_iterator(const Key&) const;
 		
 	private:
 		Vector<LinkedList<Entry>> m_buckets;
@@ -140,36 +115,29 @@ namespace BAN
 	}
 
 	template<typename Key, typename T, typename HASH>
-	template<typename... Args>
+	ErrorOr<void> HashMap<Key, T, HASH>::insert(const Key& key, const T& value)
-	ErrorOr<typename HashMap<Key, T, HASH>::iterator> HashMap<Key, T, HASH>::emplace(Key&& key, Args&&... args) requires is_constructible_v<T, Args...>
 	{
-		ASSERT(!contains(key));
+		return insert(key, move(T(value)));
-		TRY(rebucket(m_size + 1));
+	}
 
-		auto bucket_it = get_bucket_iterator(key);
+	template<typename Key, typename T, typename HASH>
-		TRY(bucket_it->emplace_back(move(key), forward<Args>(args)...));
+	ErrorOr<void> HashMap<Key, T, HASH>::insert(const Key& key, T&& value)
-		m_size++;
+	{
-
+		return emplace(key, move(value));
-		return iterator(m_buckets.end(), bucket_it, prev(bucket_it->end(), 1));
 	}
 
 	template<typename Key, typename T, typename HASH>
 	template<typename... Args>
-	ErrorOr<typename HashMap<Key, T, HASH>::iterator> HashMap<Key, T, HASH>::emplace_or_assign(Key&& key, Args&&... args) requires is_constructible_v<T, Args...>
+	ErrorOr<void> HashMap<Key, T, HASH>::emplace(const Key& key, Args&&... args)
 	{
-		if (empty())
+		ASSERT(!contains(key));
-			return emplace(move(key), forward<Args>(args)...);
+		TRY(rebucket(m_size + 1));
-
+		auto& bucket = get_bucket(key);
-		auto bucket_it = get_bucket_iterator(key);
+		auto result = bucket.emplace_back(key, forward<Args>(args)...);
-		for (auto entry_it = bucket_it->begin(); entry_it != bucket_it->end(); entry_it++)
+		if (result.is_error())
-		{
+			return Error::from_errno(ENOMEM);
-			if (entry_it->key != key)
+		m_size++;
-				continue;
+		return {};
-			entry_it->value = T(forward<Args>(args)...);
-			return iterator(m_buckets.end(), bucket_it, entry_it);
-		}
-
-		return emplace(move(key), forward<Args>(args)...);
 	}
 
 	template<typename Key, typename T, typename HASH>
@@ -182,16 +150,17 @@ namespace BAN
 	template<typename Key, typename T, typename HASH>
 	void HashMap<Key, T, HASH>::remove(const Key& key)
 	{
-		auto it = find(key);
+		if (empty()) return;
-		if (it != end())
+		auto& bucket = get_bucket(key);
-			remove(it);
+		for (auto it = bucket.begin(); it != bucket.end(); it++)
-	}
-
-	template<typename Key, typename T, typename HASH>
-	void HashMap<Key, T, HASH>::remove(iterator it)
 		{
-		it.outer_current()->remove(it.inner_current());
+			if (it->key == key)
+			{
+				bucket.remove(it);
 				m_size--;
+				return;
+			}
+		}
 	}
 
 	template<typename Key, typename T, typename HASH>
@@ -209,7 +178,7 @@ namespace BAN
 		for (Entry& entry : bucket)
 			if (entry.key == key)
 				return entry.value;
-		ASSERT_NOT_REACHED();
+		ASSERT(false);
 	}
 
 	template<typename Key, typename T, typename HASH>
@@ -220,37 +189,18 @@ namespace BAN
 		for (const Entry& entry : bucket)
 			if (entry.key == key)
 				return entry.value;
-		ASSERT_NOT_REACHED();
+		ASSERT(false);
-	}
-
-	template<typename Key, typename T, typename HASH>
-	typename HashMap<Key, T, HASH>::iterator HashMap<Key, T, HASH>::find(const Key& key)
-	{
-		if (empty())
-			return end();
-		auto bucket_it = get_bucket_iterator(key);
-		for (auto it = bucket_it->begin(); it != bucket_it->end(); it++)
-			if (it->key == key)
-				return iterator(m_buckets.end(), bucket_it, it);
-		return end();
-	}
-
-	template<typename Key, typename T, typename HASH>
-	typename HashMap<Key, T, HASH>::const_iterator HashMap<Key, T, HASH>::find(const Key& key) const
-	{
-		if (empty())
-			return end();
-		auto bucket_it = get_bucket_iterator(key);
-		for (auto it = bucket_it->begin(); it != bucket_it->end(); it++)
-			if (it->key == key)
-				return const_iterator(m_buckets.end(), bucket_it, it);
-		return end();
 	}
 
 	template<typename Key, typename T, typename HASH>
 	bool HashMap<Key, T, HASH>::contains(const Key& key) const
 	{
-		return find(key) != end();
+		if (empty()) return false;
+		const auto& bucket = get_bucket(key);
+		for (const Entry& entry : bucket)
+			if (entry.key == key)
+				return true;
+		return false;
 	}
 
 	template<typename Key, typename T, typename HASH>
@@ -273,14 +223,18 @@ namespace BAN
 
 		size_type new_bucket_count = BAN::Math::max<size_type>(bucket_count, m_buckets.size() * 2);
 		Vector<LinkedList<Entry>> new_buckets;
-		TRY(new_buckets.resize(new_bucket_count));
+		if (new_buckets.resize(new_bucket_count).is_error())
+			return Error::from_errno(ENOMEM);
 		
+		// NOTE: We have to copy the old entries to the new entries and not move
+		//       since we might run out of memory half way through.
 		for (auto& bucket : m_buckets)
 		{
-			for (auto it = bucket.begin(); it != bucket.end();)
+			for (Entry& entry : bucket)
 			{
-				size_type new_bucket_index = HASH()(it->key) % new_buckets.size();
+				size_type bucket_index = HASH()(entry.key) % new_buckets.size();
-				it = bucket.move_element_to_other_linked_list(new_buckets[new_bucket_index], new_buckets[new_bucket_index].end(), it);
+				if (new_buckets[bucket_index].push_back(entry).is_error())
+					return Error::from_errno(ENOMEM);
 			}
 		}
 
@@ -291,29 +245,17 @@ namespace BAN
 	template<typename Key, typename T, typename HASH>
 	LinkedList<typename HashMap<Key, T, HASH>::Entry>& HashMap<Key, T, HASH>::get_bucket(const Key& key)
 	{
-		return *get_bucket_iterator(key);
+		ASSERT(!m_buckets.empty());
+		auto index = HASH()(key) % m_buckets.size();
+		return m_buckets[index];
 	}
 
 	template<typename Key, typename T, typename HASH>
 	const LinkedList<typename HashMap<Key, T, HASH>::Entry>& HashMap<Key, T, HASH>::get_bucket(const Key& key) const
-	{
-		return *get_bucket_iterator(key);
-	}
-
-	template<typename Key, typename T, typename HASH>
-	Vector<LinkedList<typename HashMap<Key, T, HASH>::Entry>>::iterator HashMap<Key, T, HASH>::get_bucket_iterator(const Key& key)
 	{
 		ASSERT(!m_buckets.empty());
 		auto index = HASH()(key) % m_buckets.size();
-		return next(m_buckets.begin(), index);
+		return m_buckets[index];
-	}
-
-	template<typename Key, typename T, typename HASH>
-	Vector<LinkedList<typename HashMap<Key, T, HASH>::Entry>>::const_iterator HashMap<Key, T, HASH>::get_bucket_iterator(const Key& key) const
-	{
-		ASSERT(!m_buckets.empty());
-		auto index = HASH()(key) % m_buckets.size();
-		return next(m_buckets.begin(), index);
 	}
 
 }

BAN/include/BAN/HashSet.h

@@ -2,8 +2,6 @@
 
 #include <BAN/Errors.h>
 #include <BAN/Hash.h>
-#include <BAN/Iterators.h>
-#include <BAN/LinkedList.h>
 #include <BAN/Math.h>
 #include <BAN/Move.h>
 #include <BAN/Vector.h>
@@ -11,22 +9,24 @@
 namespace BAN
 {
 
+	template<typename T, typename HASH>
+	class HashSetIterator;
+
 	template<typename T, typename HASH = hash<T>>
 	class HashSet
 	{
 	public:
 		using value_type = T;
-		using size_type = size_t;
+		using size_type = hash_t;
-		using iterator = IteratorDouble<T, Vector, LinkedList, HashSet>;
+		using const_iterator = HashSetIterator<T, HASH>;
-		using const_iterator = ConstIteratorDouble<T, Vector, LinkedList, HashSet>;
 		
 	public:
 		HashSet() = default;
-		HashSet(const HashSet&);
+		HashSet(const HashSet<T, HASH>&);
-		HashSet(HashSet&&);
+		HashSet(HashSet<T, HASH>&&);
 
-		HashSet& operator=(const HashSet&);
+		HashSet<T, HASH>& operator=(const HashSet<T, HASH>&);
-		HashSet& operator=(HashSet&&);
+		HashSet<T, HASH>& operator=(HashSet<T, HASH>&&);
 
 		ErrorOr<void> insert(const T&);
 		ErrorOr<void> insert(T&&);
@@ -35,10 +35,8 @@ namespace BAN
 
 		ErrorOr<void> reserve(size_type);
 
-		iterator begin() { return iterator(m_buckets.end(), m_buckets.begin()); }
+		const_iterator begin() const { return const_iterator(this, m_buckets.begin()); }
-		iterator end()   { return iterator(m_buckets.end(), m_buckets.end()); }
+		const_iterator end() const   { return const_iterator(this, m_buckets.end()); }
-		const_iterator begin() const { return const_iterator(m_buckets.end(), m_buckets.begin()); }
-		const_iterator end() const   { return const_iterator(m_buckets.end(), m_buckets.end()); }
 
 		bool contains(const T&) const;
 
@@ -47,23 +45,55 @@ namespace BAN
 
 	private:
 		ErrorOr<void> rebucket(size_type);
-		LinkedList<T>& get_bucket(const T&);
+		Vector<T>& get_bucket(const T&);
-		const LinkedList<T>& get_bucket(const T&) const;
+		const Vector<T>& get_bucket(const T&) const;
 
 	private:
-		Vector<LinkedList<T>> m_buckets;
+		Vector<Vector<T>> m_buckets;
 		size_type m_size = 0;
+
+		friend class HashSetIterator<T, HASH>;
 	};
 
 	template<typename T, typename HASH>
-	HashSet<T, HASH>::HashSet(const HashSet& other)
+	class HashSetIterator
+	{
+	public:
+		HashSetIterator() = default;
+		HashSetIterator(const HashSetIterator<T, HASH>&);
+		
+		HashSetIterator<T, HASH>& operator++();
+		HashSetIterator<T, HASH> operator++(int);
+
+		const T& operator*() const;
+		const T* operator->() const;
+
+		bool operator==(const HashSetIterator<T, HASH>&) const;
+		bool operator!=(const HashSetIterator<T, HASH>&) const;
+
+		operator bool() const { return m_owner && m_current_bucket; }
+
+	private:
+		HashSetIterator(const HashSet<T, HASH>* owner, Vector<Vector<T>>::const_iterator bucket);
+		void find_next();
+
+	private:
+		const HashSet<T, HASH>*				m_owner = nullptr;
+		Vector<Vector<T>>::const_iterator	m_current_bucket;
+		Vector<T>::const_iterator			m_current_key;
+
+		friend class HashSet<T, HASH>;
+	};
+
+	template<typename T, typename HASH>
+	HashSet<T, HASH>::HashSet(const HashSet<T, HASH>& other)
 		: m_buckets(other.m_buckets)
 		, m_size(other.m_size)
 	{
 	}
 
 	template<typename T, typename HASH>
-	HashSet<T, HASH>::HashSet(HashSet&& other)
+	HashSet<T, HASH>::HashSet(HashSet<T, HASH>&& other)
 		: m_buckets(move(other.m_buckets))
 		, m_size(other.m_size)
 	{
@@ -71,7 +101,7 @@ namespace BAN
 	}
 
 	template<typename T, typename HASH>
-	HashSet<T, HASH>& HashSet<T, HASH>::operator=(const HashSet& other)
+	HashSet<T, HASH>& HashSet<T, HASH>::operator=(const HashSet<T, HASH>& other)
 	{
 		clear();
 		m_buckets = other.m_buckets;
@@ -80,7 +110,7 @@ namespace BAN
 	}
 
 	template<typename T, typename HASH>
-	HashSet<T, HASH>& HashSet<T, HASH>::operator=(HashSet&& other)
+	HashSet<T, HASH>& HashSet<T, HASH>::operator=(HashSet<T, HASH>&& other)
 	{
 		clear();
 		m_buckets = move(other.m_buckets);
@@ -111,12 +141,12 @@ namespace BAN
 	void HashSet<T, HASH>::remove(const T& key)
 	{
 		if (empty()) return;
-		auto& bucket = get_bucket(key);
+		Vector<T>& bucket = get_bucket(key);
-		for (auto it = bucket.begin(); it != bucket.end(); it++)
+		for (size_type i = 0; i < bucket.size(); i++)
 		{
-			if (*it == key)
+			if (bucket[i] == key)
 			{
-				bucket.remove(it);
+				bucket.remove(i);
 				m_size--;
 				break;
 			}	
@@ -162,17 +192,20 @@ namespace BAN
 		if (m_buckets.size() >= bucket_count)
 			return {};
 
-		size_type new_bucket_count = Math::max<size_type>(bucket_count, m_buckets.size() * 2);
+		size_type new_bucket_count = BAN::Math::max<size_type>(bucket_count, m_buckets.size() * 2);
-		Vector<LinkedList<T>> new_buckets;
+		Vector<Vector<T>> new_buckets;
 		if (new_buckets.resize(new_bucket_count).is_error())
 			return Error::from_errno(ENOMEM);
 		
-		for (auto& bucket : m_buckets)
+		// NOTE: We have to copy the old keys to the new keys and not move
+		//       since we might run out of memory half way through.
+		for (Vector<T>& bucket : m_buckets)
 		{
-			for (auto it = bucket.begin(); it != bucket.end();)
+			for (T& key : bucket)
 			{
-				size_type new_bucket_index = HASH()(*it) % new_buckets.size();
+				size_type bucket_index = HASH()(key) % new_buckets.size();
-				it = bucket.move_element_to_other_linked_list(new_buckets[new_bucket_index], new_buckets[new_bucket_index].end(), it);
+				if (new_buckets[bucket_index].push_back(key).is_error())
+					return Error::from_errno(ENOMEM);
 			}
 		}
 
@@ -181,7 +214,7 @@ namespace BAN
 	}
 
 	template<typename T, typename HASH>
-	LinkedList<T>& HashSet<T, HASH>::get_bucket(const T& key)
+	Vector<T>& HashSet<T, HASH>::get_bucket(const T& key)
 	{
 		ASSERT(!m_buckets.empty());
 		size_type index = HASH()(key) % m_buckets.size();
@@ -189,11 +222,83 @@ namespace BAN
 	}
 
 	template<typename T, typename HASH>
-	const LinkedList<T>& HashSet<T, HASH>::get_bucket(const T& key) const
+	const Vector<T>& HashSet<T, HASH>::get_bucket(const T& key) const
 	{
 		ASSERT(!m_buckets.empty());
 		size_type index = HASH()(key) % m_buckets.size();
 		return m_buckets[index];
 	}
 
+	template<typename T, typename HASH>
+	HashSetIterator<T, HASH>& HashSetIterator<T, HASH>::operator++()
+	{
+		ASSERT(*this);
+		if (m_current_key == m_current_bucket->end())
+			m_current_bucket++;
+		else
+			m_current_key++;
+		find_next();
+		return *this;
+	}
+
+	template<typename T, typename HASH>
+	HashSetIterator<T, HASH> HashSetIterator<T, HASH>::operator++(int)
+	{
+		auto temp = *this;
+		++(*this);
+		return temp;
+	}
+
+	template<typename T, typename HASH>
+	const T& HashSetIterator<T, HASH>::operator*() const
+	{
+		ASSERT(m_owner && m_current_bucket && m_current_key);
+		return *m_current_key;
+	}
+
+	template<typename T, typename HASH>
+	const T* HashSetIterator<T, HASH>::operator->() const
+	{
+		return &**this;
+	}
+
+	template<typename T, typename HASH>
+	bool HashSetIterator<T, HASH>::operator==(const HashSetIterator<T, HASH>& other) const
+	{
+		if (!m_owner || m_owner != other.m_owner)
+			return false;
+		return m_current_bucket == other.m_current_bucket
+			&& m_current_key    == other.m_current_key;
+	}
+
+	template<typename T, typename HASH>
+	bool HashSetIterator<T, HASH>::operator!=(const HashSetIterator<T, HASH>& other) const
+	{
+		return !(*this == other);
+	}
+
+	template<typename T, typename HASH>
+	HashSetIterator<T, HASH>::HashSetIterator(const HashSet<T, HASH>* owner, Vector<Vector<T>>::const_iterator bucket)
+		: m_owner(owner)
+		, m_current_bucket(bucket)
+	{
+		if (m_current_bucket != m_owner->m_buckets.end())
+			m_current_key = m_current_bucket->begin();
+		find_next();
+	}
+
+	template<typename T, typename HASH>
+	void HashSetIterator<T, HASH>::find_next()
+	{
+		ASSERT(m_owner && m_current_bucket);
+		while (m_current_bucket != m_owner->m_buckets.end())
+		{
+			if (m_current_key && m_current_key != m_current_bucket->end())
+				return;
+			m_current_bucket++;
+			m_current_key = m_current_bucket->begin();
+		}
+		m_current_key = typename Vector<T>::const_iterator();
+	}
+
 }

BAN/include/BAN/Heap.h

@@ -1,89 +0,0 @@
-#pragma once
-
-#include <BAN/Iterators.h>
-#include <BAN/Swap.h>
-#include <BAN/Traits.h>
-
-namespace BAN
-{
-
-	namespace detail
-	{
-
-		template<typename It, typename Comp>
-		void heapify_up(It begin, size_t index, Comp comp)
-		{
-			size_t parent = (index - 1) / 2;
-			while (parent < index)
-			{
-				if (comp(*(begin + index), *(begin + parent)))
-					break;
-				swap(*(begin + parent), *(begin + index));
-				index = parent;
-				parent = (index - 1) / 2;
-			}
-		}
-
-		template<typename It, typename Comp>
-		void heapify_down(It begin, size_t index, size_t len, Comp comp)
-		{
-			for (;;)
-			{
-				const size_t lchild = 2 * index + 1;
-				const size_t rchild = 2 * index + 2;
-
-				size_t child = 0;
-				if (lchild < len && !comp(*(begin + lchild), *(begin + index)))
-				{
-					if (rchild < len && !comp(*(begin + rchild), *(begin + lchild)))
-						child = rchild;
-					else
-						child = lchild;
-				}
-				else if (rchild < len && !comp(*(begin + rchild), *(begin + index)))
-					child = rchild;
-				else
-					break;
-
-				swap(*(begin + child), *(begin + index));
-				index = child;
-			}
-		}
-
-	}
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void make_heap(It begin, It end, Comp comp = {})
-	{
-		const size_t len = distance(begin, end);
-		if (len <= 1)
-			return;
-
-		size_t index = (len - 2) / 2;
-		while (index < len)
-			detail::heapify_down(begin, index--, len, comp);
-	}
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void push_heap(It begin, It end, Comp comp = {})
-	{
-		const size_t len = distance(begin, end);
-		detail::heapify_up(begin, len - 1, comp);
-	}
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void pop_heap(It begin, It end, Comp comp = {})
-	{
-		const size_t len = distance(begin, end);
-		swap(*begin, *(begin + len - 1));
-		detail::heapify_down(begin, 0, len - 1, comp);
-	}
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void sort_heap(It begin, It end, Comp comp = {})
-	{
-		while (begin != end)
-			pop_heap(begin, end--, comp);
-	}
-
-}

BAN/include/BAN/IPv4.h

@@ -1,79 +0,0 @@
-#pragma once
-
-#include <BAN/Endianness.h>
-#include <BAN/Formatter.h>
-#include <BAN/Hash.h>
-
-namespace BAN
-{
-
-	struct IPv4Address
-	{
-		constexpr IPv4Address()
-			: IPv4Address(0)
-		{ }
-
-		constexpr IPv4Address(uint32_t u32_address)
-		{
-			raw = u32_address;
-		}
-
-		constexpr IPv4Address(uint8_t oct1, uint8_t oct2, uint8_t oct3, uint8_t oct4)
-		{
-			octets[0] = oct1;
-			octets[1] = oct2;
-			octets[2] = oct3;
-			octets[3] = oct4;
-		}
-
-		constexpr bool operator==(const IPv4Address& other) const
-		{
-			return raw == other.raw;
-		}
-
-		constexpr IPv4Address mask(const IPv4Address& other) const
-		{
-			return IPv4Address(raw & other.raw);
-		}
-
-		union
-		{
-			uint8_t octets[4];
-			uint32_t raw;
-		} __attribute__((packed));
-	};
-	static_assert(sizeof(IPv4Address) == 4);
-
-	template<>
-	struct hash<IPv4Address>
-	{
-		constexpr hash_t operator()(IPv4Address ipv4) const
-		{
-			return hash<uint32_t>()(ipv4.raw);
-		}
-	};
-
-}
-
-namespace BAN::Formatter
-{
-
-	template<typename F>
-	void print_argument(F putc, const IPv4Address& ipv4, const ValueFormat&)
-	{
-		ValueFormat format {
-			.base = 10,
-			.percision = 0,
-			.fill = 0,
-			.upper = false,
-		};
-
-		print_argument(putc, ipv4.octets[0], format);
-		for (size_t i = 1; i < 4; i++)
-		{
-			putc('.');
-			print_argument(putc, ipv4.octets[i], format);
-		}
-	}
-
-}

BAN/include/BAN/Iterators.h

@@ -1,180 +1,92 @@
 #pragma once
 
 #include <BAN/Assert.h>
-#include <BAN/Traits.h>
-
-#include <stddef.h>
 
 namespace BAN
 {
 
-	template<typename It>
-	constexpr It next(It it, size_t count)
-	{
-		for (size_t i = 0; i < count; i++)
-			++it;
-		return it;
-	}
-
-	template<typename It>
-	requires requires(It it, size_t n) { requires is_same_v<decltype(it + n), It>; }
-	constexpr It next(It it, size_t count)
-	{
-		return it + count;
-	}
-
-	template<typename It>
-	constexpr It prev(It it, size_t count)
-	{
-		for (size_t i = 0; i < count; i++)
-			--it;
-		return it;
-	}
-
-	template<typename It>
-	requires requires(It it, size_t n) { requires is_same_v<decltype(it - n), It>; }
-	constexpr It prev(It it, size_t count)
-	{
-		return it - count;
-	}
-
-	template<typename It>
-	constexpr size_t distance(It it1, It it2)
-	{
-		size_t dist = 0;
-		while (it1 != it2)
-		{
-			++it1;
-			++dist;
-		}
-		return dist;
-	}
-
-	template<typename It>
-	requires requires(It it1, It it2) { requires is_integral_v<decltype(it2 - it1)>; }
-	constexpr size_t distance(It it1, It it2)
-	{
-		return it2 - it1;
-	}
-
 	template<typename T, typename Container, bool CONST>
 	class IteratorSimpleGeneral
 	{
 	public:
-		using value_type = T;
+		IteratorSimpleGeneral() = default;
-
-	public:
-		constexpr IteratorSimpleGeneral() = default;
 		template<bool CONST2, typename = enable_if_t<CONST2 == CONST || CONST>>
-		constexpr IteratorSimpleGeneral(const IteratorSimpleGeneral<T, Container, CONST2>& other)
+		IteratorSimpleGeneral(const IteratorSimpleGeneral<T, Container, CONST2>& other)
 			: m_pointer(other.m_pointer)
-			, m_valid(other.m_valid)
 		{
 		}
 
-		constexpr const T& operator*() const
+		const T& operator*() const
 		{
 			ASSERT(m_pointer);
 			return *m_pointer;
 		}
 		template<bool CONST2 = CONST>
-		constexpr enable_if_t<!CONST2, T&> operator*()
+		enable_if_t<!CONST2, T&> operator*()
 		{
-			ASSERT(*this);
 			ASSERT(m_pointer);
 			return *m_pointer;
 		}
 
-		constexpr const T* operator->() const
+		const T* operator->() const
 		{
-			ASSERT(*this);
 			ASSERT(m_pointer);
 			return m_pointer;
 		}
 		template<bool CONST2 = CONST>
-		constexpr enable_if_t<!CONST2, T*> operator->()
+		enable_if_t<!CONST2, T*> operator->()
 		{
-			ASSERT(*this);
 			ASSERT(m_pointer);
 			return m_pointer;
 		}
 
-		constexpr IteratorSimpleGeneral& operator++()
+		IteratorSimpleGeneral& operator++()
 		{
-			ASSERT(*this);
 			ASSERT(m_pointer);
 			++m_pointer;
 			return *this;
 		}
-		constexpr IteratorSimpleGeneral operator++(int)
+		IteratorSimpleGeneral operator++(int)
 		{
 			auto temp = *this;
 			++(*this);
 			return temp;
 		}
 
-		constexpr IteratorSimpleGeneral& operator--()
+		IteratorSimpleGeneral& operator--()
 		{
-			ASSERT(*this);
 			ASSERT(m_pointer);
-			--m_pointer;
+			return --m_pointer;
-			return *this;
 		}
-		constexpr IteratorSimpleGeneral operator--(int)
+		IteratorSimpleGeneral operator--(int)
 		{
 			auto temp = *this;
 			--(*this);
 			return temp;
 		}
 
-		constexpr size_t operator-(const IteratorSimpleGeneral& other) const
+		bool operator==(const IteratorSimpleGeneral& other) const
 		{
-			ASSERT(*this && other);
-			return m_pointer - other.m_pointer;
-		}
-
-		constexpr IteratorSimpleGeneral operator+(size_t offset) const
-		{
-			return IteratorSimpleGeneral(m_pointer + offset);
-		}
-
-		constexpr IteratorSimpleGeneral operator-(size_t offset) const
-		{
-			return IteratorSimpleGeneral(m_pointer - offset);
-		}
-
-		constexpr bool operator<(const IteratorSimpleGeneral& other) const
-		{
-			ASSERT(*this);
-			return m_pointer < other.m_pointer;
-		}
-
-		constexpr bool operator==(const IteratorSimpleGeneral& other) const
-		{
-			ASSERT(*this);
 			return m_pointer == other.m_pointer;
 		}
-		constexpr bool operator!=(const IteratorSimpleGeneral& other) const
+		bool operator!=(const IteratorSimpleGeneral& other) const
 		{
-			ASSERT(*this);
 			return !(*this == other);
 		}
 
-		constexpr explicit operator bool() const
+		operator bool() const
 		{
-			return m_valid;
+			return m_pointer;
 		}
 
 	private:
-		constexpr IteratorSimpleGeneral(maybe_const_t<CONST, T>* pointer)
+		IteratorSimpleGeneral(maybe_const_t<CONST, T>* pointer)
 			: m_pointer(pointer)
-			, m_valid(true)
 		{
 		}
 
 	private:
 		maybe_const_t<CONST, T>* m_pointer = nullptr;
-		bool m_valid = false;
 
 		friend IteratorSimpleGeneral<T, Container, !CONST>;
 		friend Container;
@@ -190,19 +102,17 @@ namespace BAN
 		using InnerIterator = either_or_t<CONST, typename Inner::const_iterator, typename Inner::iterator>;
 		using OuterIterator = either_or_t<CONST, typename Outer::const_iterator, typename Outer::iterator>;
 
-		using value_type = T;
-
 	public:
-		constexpr IteratorDoubleGeneral() = default;
+		IteratorDoubleGeneral() = default;
 		template<bool CONST2, typename = enable_if_t<CONST2 == CONST || CONST>>
-		constexpr IteratorDoubleGeneral(const IteratorDoubleGeneral<T, OuterContainer, InnerContainer, Container, CONST2>& other)
+		IteratorDoubleGeneral(const IteratorDoubleGeneral<T, OuterContainer, InnerContainer, Container, CONST2>& other)
 			: m_outer_end(other.m_outer_end)
 			, m_outer_current(other.m_outer_current)
 			, m_inner_current(other.m_inner_current)
 		{
 		}
 
-		constexpr const T& operator*() const
+		const T& operator*() const
 		{
 			ASSERT(*this);
 			ASSERT(m_outer_current != m_outer_end);
@@ -210,7 +120,7 @@ namespace BAN
 			return m_inner_current.operator*();
 		}
 		template<bool CONST2 = CONST>
-		constexpr enable_if_t<!CONST2, T&> operator*()
+		enable_if_t<!CONST2, T&> operator*()
 		{
 			ASSERT(*this);
 			ASSERT(m_outer_current != m_outer_end);
@@ -218,7 +128,7 @@ namespace BAN
 			return m_inner_current.operator*();
 		}
 
-		constexpr const T* operator->() const
+		const T* operator->() const
 		{
 			ASSERT(*this);
 			ASSERT(m_outer_current != m_outer_end);
@@ -226,7 +136,7 @@ namespace BAN
 			return m_inner_current.operator->();
 		}
 		template<bool CONST2 = CONST>
-		constexpr enable_if_t<!CONST2, T*> operator->()
+		enable_if_t<!CONST2, T*> operator->()
 		{
 			ASSERT(*this);
 			ASSERT(m_outer_current != m_outer_end);
@@ -234,7 +144,7 @@ namespace BAN
 			return m_inner_current.operator->();
 		}
 
-		constexpr IteratorDoubleGeneral& operator++()
+		IteratorDoubleGeneral& operator++()
 		{
 			ASSERT(*this);
 			ASSERT(m_outer_current != m_outer_end);
@@ -243,37 +153,37 @@ namespace BAN
 			find_valid_or_end();
 			return *this;
 		}
-		constexpr IteratorDoubleGeneral operator++(int)
+		IteratorDoubleGeneral operator++(int)
 		{
 			auto temp = *this;
 			++(*this);
 			return temp;
 		}
 
-		constexpr bool operator==(const IteratorDoubleGeneral& other) const
+		bool operator==(const IteratorDoubleGeneral& other) const
 		{
-			ASSERT(*this && other);
+			if (!*this || !other)
+				return false;
 			if (m_outer_end != other.m_outer_end)
 				return false;
 			if (m_outer_current != other.m_outer_current)
 				return false;
 			if (m_outer_current == m_outer_end)
 				return true;
-			ASSERT(m_inner_current && other.m_inner_current);
 			return m_inner_current == other.m_inner_current;
 		}
-		constexpr bool operator!=(const IteratorDoubleGeneral& other) const
+		bool operator!=(const IteratorDoubleGeneral& other) const
 		{
 			return !(*this == other);
 		}
 
-		constexpr explicit operator bool() const
+		operator bool() const
 		{
-			return !!m_outer_current;
+			return m_outer_end && m_outer_current;
 		}
 
 	private:
-		constexpr IteratorDoubleGeneral(const OuterIterator& outer_end, const OuterIterator& outer_current)
+		IteratorDoubleGeneral(const OuterIterator& outer_end, const OuterIterator& outer_current)
 			: m_outer_end(outer_end)
 			, m_outer_current(outer_current)
 		{
@@ -284,15 +194,7 @@ namespace BAN
 			}
 		}
 
-		constexpr IteratorDoubleGeneral(const OuterIterator& outer_end, const OuterIterator& outer_current, const InnerIterator& inner_current)
+		void find_valid_or_end()
-			: m_outer_end(outer_end)
-			, m_outer_current(outer_current)
-			, m_inner_current(inner_current)
-		{
-			find_valid_or_end();
-		}
-
-		constexpr void find_valid_or_end()
 		{
 			while (m_inner_current == m_outer_current->end())
 			{
@@ -303,9 +205,6 @@ namespace BAN
 			}
 		}
 
-		constexpr OuterIterator outer_current() { return m_outer_current; }
-		constexpr InnerIterator inner_current() { return m_inner_current; }
-
 	private:
 		OuterIterator m_outer_end;
 		OuterIterator m_outer_current;

BAN/include/BAN/Limits.h

@@ -1,156 +0,0 @@
-#pragma once
-
-#include <BAN/Traits.h>
-
-#include <stdint.h>
-
-namespace BAN
-{
-
-	template<typename T>
-	class numeric_limits
-	{
-	public:
-		numeric_limits() = delete;
-
-		static inline constexpr T max()
-		{
-			if constexpr(is_same_v<T, char>)
-				return __SCHAR_MAX__;
-			if constexpr(is_same_v<T, signed char>)
-				return __SCHAR_MAX__;
-			if constexpr(is_same_v<T, unsigned char>)
-				return (T)__SCHAR_MAX__ * 2 + 1;
-
-			if constexpr(is_same_v<T, short>)
-				return __SHRT_MAX__;
-			if constexpr(is_same_v<T, int>)
-				return __INT_MAX__;
-			if constexpr(is_same_v<T, long>)
-				return __LONG_MAX__;
-			if constexpr(is_same_v<T, long long>)
-				return __LONG_LONG_MAX__;
-
-			if constexpr(is_same_v<T, unsigned short>)
-				return (T)__SHRT_MAX__ * 2 + 1;
-			if constexpr(is_same_v<T, unsigned int>)
-				return (T)__INT_MAX__ * 2 + 1;
-			if constexpr(is_same_v<T, unsigned long>)
-				return (T)__LONG_MAX__ * 2 + 1;
-			if constexpr(is_same_v<T, unsigned long long>)
-				return (T)__LONG_LONG_MAX__ * 2 + 1;
-
-			if constexpr(is_same_v<T, float>)
-				return __FLT_MAX__;
-			if constexpr(is_same_v<T, double>)
-				return __DBL_MAX__;
-			if constexpr(is_same_v<T, long double>)
-				return __LDBL_MAX__;
-		}
-
-		static inline constexpr T min()
-		{
-			if constexpr(is_signed_v<T> && is_integral_v<T>)
-				return -max() - 1;
-
-			if constexpr(is_unsigned_v<T> && is_integral_v<T>)
-				return 0;
-
-			if constexpr(is_same_v<T, float>)
-				return __FLT_MIN__;
-			if constexpr(is_same_v<T, double>)
-				return __DBL_MIN__;
-			if constexpr(is_same_v<T, long double>)
-				return __LDBL_MIN__;
-		}
-
-		static inline constexpr bool has_infinity()
-		{
-			if constexpr(is_same_v<T, float>)
-				return __FLT_HAS_INFINITY__;
-			if constexpr(is_same_v<T, double>)
-				return __DBL_HAS_INFINITY__;
-			if constexpr(is_same_v<T, long double>)
-				return __LDBL_HAS_INFINITY__;
-			return false;
-		}
-
-		static inline constexpr T infinity() requires(has_infinity())
-		{
-			if constexpr(is_same_v<T, float>)
-				return __builtin_inff();
-			if constexpr(is_same_v<T, double>)
-				return __builtin_inf();
-			if constexpr(is_same_v<T, long double>)
-				return __builtin_infl();
-		}
-
-		static inline constexpr bool has_quiet_NaN()
-		{
-			if constexpr(is_same_v<T, float>)
-				return __FLT_HAS_QUIET_NAN__;
-			if constexpr(is_same_v<T, double>)
-				return __DBL_HAS_QUIET_NAN__;
-			if constexpr(is_same_v<T, long double>)
-				return __LDBL_HAS_QUIET_NAN__;
-			return false;
-		}
-
-		static inline constexpr T quiet_NaN() requires(has_quiet_NaN())
-		{
-			if constexpr(is_same_v<T, float>)
-				return __builtin_nanf("");
-			if constexpr(is_same_v<T, double>)
-				return __builtin_nan("");
-			if constexpr(is_same_v<T, long double>)
-				return __builtin_nanl("");
-		}
-
-		static inline constexpr int max_exponent2()
-		{
-			static_assert(__FLT_RADIX__ == 2);
-			if constexpr(is_same_v<T, float>)
-				return __FLT_MAX_EXP__;
-			if constexpr(is_same_v<T, double>)
-				return __DBL_MAX_EXP__;
-			if constexpr(is_same_v<T, long double>)
-				return __LDBL_MAX_EXP__;
-			return 0;
-		}
-
-		static inline constexpr int max_exponent10()
-		{
-			if constexpr(is_same_v<T, float>)
-				return __FLT_MAX_10_EXP__;
-			if constexpr(is_same_v<T, double>)
-				return __DBL_MAX_10_EXP__;
-			if constexpr(is_same_v<T, long double>)
-				return __LDBL_MAX_10_EXP__;
-			return 0;
-		}
-
-		static inline constexpr int min_exponent2()
-		{
-			static_assert(__FLT_RADIX__ == 2);
-			if constexpr(is_same_v<T, float>)
-				return __FLT_MIN_EXP__;
-			if constexpr(is_same_v<T, double>)
-				return __DBL_MIN_EXP__;
-			if constexpr(is_same_v<T, long double>)
-				return __LDBL_MIN_EXP__;
-			return 0;
-		}
-
-		static inline constexpr int min_exponent10()
-		{
-			if constexpr(is_same_v<T, float>)
-				return __FLT_MIN_10_EXP__;
-			if constexpr(is_same_v<T, double>)
-				return __DBL_MIN_10_EXP__;
-			if constexpr(is_same_v<T, long double>)
-				return __LDBL_MIN_10_EXP__;
-			return 0;
-		}
-	};
-
-}

BAN/include/BAN/LinkedList.h

@@ -3,7 +3,6 @@
 #include <BAN/Errors.h>
 #include <BAN/Move.h>
 #include <BAN/New.h>
-#include <BAN/PlacementNew.h>
 
 namespace BAN
 {
@@ -22,11 +21,11 @@ namespace BAN
 
 	public:
 		LinkedList() = default;
-		LinkedList(const LinkedList<T>& other) requires is_copy_constructible_v<T> { *this = other; }
+		LinkedList(const LinkedList<T>& other)	{ *this = other; }
 		LinkedList(LinkedList<T>&& other)		{ *this = move(other); }
 		~LinkedList()							{ clear(); }
 
-		LinkedList<T>& operator=(const LinkedList<T>&) requires is_copy_constructible_v<T>;
+		LinkedList<T>& operator=(const LinkedList<T>&);
 		LinkedList<T>& operator=(LinkedList<T>&&);
 
 		ErrorOr<void> push_back(const T&);
@@ -34,16 +33,14 @@ namespace BAN
 		ErrorOr<void> insert(iterator, const T&);
 		ErrorOr<void> insert(iterator, T&&);
 		template<typename... Args>
-		ErrorOr<void> emplace_back(Args&&...) requires is_constructible_v<T, Args...>;
+		ErrorOr<void> emplace_back(Args&&...);
 		template<typename... Args>
-		ErrorOr<void> emplace(iterator, Args&&...) requires is_constructible_v<T, Args...>;
+		ErrorOr<void> emplace(iterator, Args&&...);
 
 		void pop_back();
 		iterator remove(iterator);
 		void clear();
 
-		iterator move_element_to_other_linked_list(LinkedList& dest_list, iterator dest_iter, iterator src_iter);
-
 		iterator begin()				{ return iterator(m_data, empty()); }
 		const_iterator begin() const	{ return const_iterator(m_data, empty()); }
 		iterator end()					{ return iterator(m_last, true); }
@@ -67,11 +64,7 @@ namespace BAN
 			Node* prev;
 		};
 
-		template<typename... Args>
+		ErrorOr<Node*> allocate_node() const;
-		ErrorOr<Node*> allocate_node(Args&&...) const;
-
-		Node* remove_node(iterator);
-		void insert_node(iterator, Node*);
 
 		Node* m_data = nullptr;
 		Node* m_last = nullptr;
@@ -122,7 +115,7 @@ namespace BAN
 	};
 
 	template<typename T>
-	LinkedList<T>& LinkedList<T>::operator=(const LinkedList<T>& other) requires is_copy_constructible_v<T>
+	LinkedList<T>& LinkedList<T>::operator=(const LinkedList<T>& other)
 	{
 		clear();
 		for (const T& elem : other)
@@ -143,31 +136,6 @@ namespace BAN
 		return *this;
 	}
 
-	template<typename T>
-	LinkedList<T>::Node* LinkedList<T>::remove_node(iterator iter)
-	{
-		ASSERT(!empty() && iter);
-		Node* node = iter.m_current;
-		Node* prev = node->prev;
-		Node* next = node->next;
-		(prev ? prev->next : m_data) = next;
-		(next ? next->prev : m_last) = prev;
-		m_size--;
-		return node;
-	}
-
-	template<typename T>
-	void LinkedList<T>::insert_node(iterator iter, Node* node)
-	{
-		Node* next = iter.m_past_end ? nullptr : iter.m_current;
-		Node* prev = next ? next->prev : m_last;
-		node->next = next;
-		node->prev = prev;
-		(prev ? prev->next : m_data) = node;
-		(next ? next->prev : m_last) = node;
-		m_size++;
-	}
-
 	template<typename T>
 	ErrorOr<void> LinkedList<T>::push_back(const T& value)
 	{
@@ -189,31 +157,44 @@ namespace BAN
 	template<typename T>
 	ErrorOr<void> LinkedList<T>::insert(iterator iter, T&& value)
 	{
-		Node* new_node = TRY(allocate_node(move(value)));
+		Node* next = iter.m_past_end ? nullptr : iter.m_current;
-		insert_node(iter, new_node);
+		Node* prev = next ? next->prev : m_last;
+		Node* new_node = TRY(allocate_node());
+		new (&new_node->value) T(move(value));
+		new_node->next = next;
+		new_node->prev = prev;
+		(prev ? prev->next : m_data) = new_node;
+		(next ? next->prev : m_last) = new_node;
+		m_size++;
 		return {};
 	}
 
 	template<typename T>
 	template<typename... Args>
-	ErrorOr<void> LinkedList<T>::emplace_back(Args&&... args) requires is_constructible_v<T, Args...>
+	ErrorOr<void> LinkedList<T>::emplace_back(Args&&... args)
 	{
 		return emplace(end(), forward<Args>(args)...);
 	}
 
 	template<typename T>
 	template<typename... Args>
-	ErrorOr<void> LinkedList<T>::emplace(iterator iter, Args&&... args) requires is_constructible_v<T, Args...>
+	ErrorOr<void> LinkedList<T>::emplace(iterator iter, Args&&... args)
 	{
-		Node* new_node = TRY(allocate_node(forward<Args>(args)...));
+		Node* next = iter.m_past_end ? nullptr : iter.m_current;
-		insert_node(iter, new_node);
+		Node* prev = next ? next->prev : m_last;
+		Node* new_node = TRY(allocate_node());
+		new (&new_node->value) T(forward<Args>(args)...);
+		new_node->next = next;
+		new_node->prev = prev;
+		(prev ? prev->next : m_data) = new_node;
+		(next ? next->prev : m_last) = new_node;
+		m_size++;
 		return {};
 	}
 
 	template<typename T>
 	void LinkedList<T>::pop_back()
 	{
-		ASSERT(!empty());
 		remove(iterator(m_last, false));
 	}
 
@@ -221,10 +202,14 @@ namespace BAN
 	LinkedList<T>::iterator LinkedList<T>::remove(iterator iter)
 	{
 		ASSERT(!empty() && iter);
-		Node* node = remove_node(iter);
+		Node* node = iter.m_current;
+		Node* prev = node->prev;
 		Node* next = node->next;
 		node->value.~T();
 		BAN::deallocator(node);
+		(prev ? prev->next : m_data) = next;
+		(next ? next->prev : m_last) = prev;
+		m_size--;
 		return next ? iterator(next, false) : iterator(m_last, true);
 	}
 
@@ -244,16 +229,6 @@ namespace BAN
 		m_size = 0;
 	}
 
-	template<typename T>
-	LinkedList<T>::iterator LinkedList<T>::move_element_to_other_linked_list(LinkedList& dest_list, iterator dest_iter, iterator src_iter)
-	{
-		ASSERT(!empty() && src_iter);
-		Node* node = remove_node(src_iter);
-		iterator ret = node->next ? iterator(node->next, false) : iterator(m_last, true);
-		dest_list.insert_node(dest_iter, node);
-		return ret;
-	}
-
 	template<typename T>
 	const T& LinkedList<T>::back() const
 	{
@@ -308,13 +283,11 @@ namespace BAN
 	}
 
 	template<typename T>
-	template<typename... Args>
+	ErrorOr<typename LinkedList<T>::Node*> LinkedList<T>::allocate_node() const
-	ErrorOr<typename LinkedList<T>::Node*> LinkedList<T>::allocate_node(Args&&... args) const
 	{
 		Node* node = (Node*)BAN::allocator(sizeof(Node));
 		if (node == nullptr)
 			return Error::from_errno(ENOMEM);	
-		new (&node->value) T(forward<Args>(args)...);
 		return node;
 	}
 

BAN/include/BAN/MAC.h

@@ -1,47 +0,0 @@
-#pragma once
-
-#include <BAN/Formatter.h>
-
-namespace BAN
-{
-
-	struct MACAddress
-	{
-		uint8_t address[6];
-
-		constexpr bool operator==(const MACAddress& other) const
-		{
-			return
-				address[0] == other.address[0] &&
-				address[1] == other.address[1] &&
-				address[2] == other.address[2] &&
-				address[3] == other.address[3] &&
-				address[4] == other.address[4] &&
-				address[5] == other.address[5];
-		}
-	};
-
-}
-
-namespace BAN::Formatter
-{
-
-	template<typename F>
-	void print_argument(F putc, const MACAddress& mac, const ValueFormat&)
-	{
-		ValueFormat format {
-			.base = 16,
-			.percision = 0,
-			.fill = 2,
-			.upper = true,
-		};
-
-		print_argument(putc, mac.address[0], format);
-		for (size_t i = 1; i < 6; i++)
-		{
-			putc(':');
-			print_argument(putc, mac.address[i], format);
-		}
-	}
-
-}

BAN/include/BAN/Math.h

@@ -1,20 +1,13 @@
 #pragma once
 
-#include <BAN/Limits.h>
-#include <BAN/Numbers.h>
 #include <BAN/Traits.h>
 
-#include <float.h>
+#include <stddef.h>
+#include <stdint.h>
 
 namespace BAN::Math
 {
 
-	template<typename T>
-	inline constexpr T abs(T x)
-	{
-		return x < 0 ? -x : x;
-	}
-
 	template<typename T>
 	inline constexpr T min(T a, T b)
 	{
@@ -36,11 +29,12 @@ namespace BAN::Math
 	template<integral T>
 	inline constexpr T gcd(T a, T b)
 	{
+		T t;
 		while (b)
 		{
-			T temp = b;
+			t = b;
 			b = a % b;
-			a = temp;
+			a = t;
 		}
 		return a;
 	}
@@ -58,408 +52,54 @@ namespace BAN::Math
 	}
 
 	template<integral T>
-	inline constexpr bool is_power_of_two(T x)
+	inline constexpr bool is_power_of_two(T value)
 	{
-		if (x == 0)
+		if (value == 0)
 			return false;
-		return (x & (x - 1)) == 0;
+		return (value & (value - 1)) == 0;
-	}
-
-	template<integral T>
-	__attribute__((always_inline))
-	inline constexpr bool will_multiplication_overflow(T a, T b)
-	{
-		T dummy;
-		return __builtin_mul_overflow(a, b, &dummy);
-	}
-
-	template<integral T>
-	__attribute__((always_inline))
-	inline constexpr bool will_addition_overflow(T a, T b)
-	{
-		T dummy;
-		return __builtin_add_overflow(a, b, &dummy);
-	}
-
-	template<typename T>
-	requires is_same_v<T, unsigned int> || is_same_v<T, unsigned long> || is_same_v<T, unsigned long long>
-	inline constexpr T ilog2(T x)
-	{
-		if constexpr(is_same_v<T, unsigned int>)
-			return sizeof(T) * 8 - __builtin_clz(x) - 1;
-		if constexpr(is_same_v<T, unsigned long>)
-			return sizeof(T) * 8 - __builtin_clzl(x) - 1;
-		return sizeof(T) * 8 - __builtin_clzll(x) - 1;
-	}
-
-// This is ugly but my clangd does not like including
-// intrinsic headers at all
-#if !defined(__SSE__) || !defined(__SSE2__)
-#pragma GCC push_options
-#ifndef __SSE__
-#pragma GCC target("sse")
-#endif
-#ifndef __SSE2__
-#pragma GCC target("sse2")
-#endif
-#define BAN_MATH_POP_OPTIONS
-#endif
-
-	template<floating_point T>
-	inline constexpr T floor(T x)
-	{
-		if constexpr(is_same_v<T, float>)
-			return __builtin_floorf(x);
-		if constexpr(is_same_v<T, double>)
-			return __builtin_floor(x);
-		if constexpr(is_same_v<T, long double>)
-			return __builtin_floorl(x);
 	}
 
 	template<floating_point T>
-	inline constexpr T ceil(T x)
+	inline constexpr T log2(T value)
 	{
-		if constexpr(is_same_v<T, float>)
+		T result;
-			return __builtin_ceilf(x);
+		asm volatile("fyl2x" : "=t"(result) : "0"(value), "u"((T)1.0) : "st(1)");
-		if constexpr(is_same_v<T, double>)
+		return result;
-			return __builtin_ceil(x);
-		if constexpr(is_same_v<T, long double>)
-			return __builtin_ceill(x);
 	}
 
 	template<floating_point T>
-	inline constexpr T round(T x)
+	inline constexpr T log10(T value)
 	{
-		if (x == (T)0.0)
+		constexpr T INV_LOG_2_10 = 0.3010299956639811952137388947244930267681898814621085413104274611;
-			return x;
+		T result;
-		if (x > (T)0.0)
+		asm volatile("fyl2x" : "=t"(result) : "0"(value), "u"(INV_LOG_2_10) : "st(1)");
-			return floor<T>(x + (T)0.5);
+		return result;
-		return ceil<T>(x - (T)0.5);
 	}
 
 	template<floating_point T>
-	inline constexpr T trunc(T x)
+	inline constexpr T log(T value, T base)
 	{
-		if constexpr(is_same_v<T, float>)
+		return log2(value) / log2(base);
-			return __builtin_truncf(x);
-		if constexpr(is_same_v<T, double>)
-			return __builtin_trunc(x);
-		if constexpr(is_same_v<T, long double>)
-			return __builtin_truncl(x);
 	}
 
 	template<floating_point T>
-	inline constexpr T rint(T x)
+	inline constexpr T pow(T base, T exp)
 	{
-		asm("frndint" : "+t"(x));
+		T result;
-		return x;
+		asm volatile(
-	}
+			"fyl2x;"
-
-	template<floating_point T>
-	inline constexpr T fmod(T a, T b)
-	{
-		asm(
-			"1:"
-			"fprem;"
-			"fnstsw %%ax;"
-			"testb $4, %%ah;"
-			"jne 1b;"
-			: "+t"(a)
-			: "u"(b)
-			: "ax", "cc"
-		);
-		return a;
-	}
-
-	template<floating_point T>
-	inline constexpr T remainder(T a, T b)
-	{
-		asm(
-			"1:"
-			"fprem1;"
-			"fnstsw %%ax;"
-			"testb $4, %%ah;"
-			"jne 1b;"
-			: "+t"(a)
-			: "u"(b)
-			: "ax", "cc"
-		);
-		return a;
-	}
-
-	template<floating_point T>
-	static T modf(T x, T* iptr)
-	{
-		const T frac = BAN::Math::fmod<T>(x, (T)1.0);
-		*iptr = x - frac;
-		return frac;
-	}
-
-	template<floating_point T>
-	inline constexpr T frexp(T num, int* exp)
-	{
-		if (num == (T)0.0)
-		{
-			*exp = 0;
-			return (T)0.0;
-		}
-
-		T e;
-		asm("fxtract" : "+t"(num), "=u"(e));
-		*exp = (int)e + 1;
-		return num / (T)2.0;
-	}
-
-	template<floating_point T>
-	inline constexpr T copysign(T x, T y)
-	{
-		if ((x < (T)0.0) != (y < (T)0.0))
-			x = -x;
-		return x;
-	}
-
-	namespace detail
-	{
-
-		template<floating_point T>
-		inline constexpr T fyl2x(T x, T y)
-		{
-			asm("fyl2x" : "+t"(x) : "u"(y) : "st(1)");
-			return x;
-		}
-
-	}
-
-	template<floating_point T>
-	inline constexpr T log(T x)
-	{
-		return detail::fyl2x<T>(x, numbers::ln2_v<T>);
-	}
-
-	template<floating_point T>
-	inline constexpr T log2(T x)
-	{
-		return detail::fyl2x<T>(x, 1.0);
-	}
-
-	template<floating_point T>
-	inline constexpr T log10(T x)
-	{
-		return detail::fyl2x<T>(x, numbers::lg2_v<T>);
-	}
-
-	template<floating_point T>
-	inline constexpr T logb(T x)
-	{
-		static_assert(FLT_RADIX == 2);
-		return log2<T>(x);
-	}
-
-	template<floating_point T>
-	inline constexpr T exp2(T x)
-	{
-		if (abs(x) <= (T)1.0)
-		{
-			asm("f2xm1" : "+t"(x));
-			return x + (T)1.0;
-		}
-
-		asm(
 			"fld1;"
 			"fld %%st(1);"
 			"fprem;"
 			"f2xm1;"
 			"faddp;"
 			"fscale;"
-			"fstp %%st(1);"
+			"fxch %%st(1);"
-			: "+t"(x)
+			"fstp %%st;"
+			: "=t"(result)
+			: "0"(base), "u"(exp)
 		);
-
+		return result;
-		return x;
 	}
 
-	template<floating_point T>
-	inline constexpr T exp(T x)
-	{
-		return exp2<T>(x * numbers::log2e_v<T>);
-	}
-
-	template<floating_point T>
-	inline constexpr T pow(T x, T y)
-	{
-		if (x == (T)0.0)
-			return (T)0.0;
-		return exp2<T>(y * log2<T>(x));
-	}
-
-	template<floating_point T>
-	inline constexpr T scalbn(T x, int n)
-	{
-		asm("fscale" : "+t"(x) : "u"(static_cast<T>(n)));
-		return x;
-	}
-
-	template<floating_point T>
-	inline constexpr T ldexp(T x, int y)
-	{
-		const bool exp_sign = y < 0;
-		if (exp_sign)
-			y = -y;
-
-		T exp = (T)1.0;
-		T mult = (T)2.0;
-		while (y)
-		{
-			if (y & 1)
-				exp *= mult;
-			mult *= mult;
-			y >>= 1;
-		}
-
-		if (exp_sign)
-			exp = (T)1.0 / exp;
-
-		return x * exp;
-	}
-
-	template<floating_point T>
-	inline constexpr T sqrt(T x)
-	{
-		if constexpr(BAN::is_same_v<T, float>)
-		{
-			using v4sf = float __attribute__((vector_size(16)));
-			return __builtin_ia32_sqrtss((v4sf) { x, 0.0f, 0.0f, 0.0f })[0];
-		}
-		else if constexpr(BAN::is_same_v<T, double>)
-		{
-			using v2df = double __attribute__((vector_size(16)));
-			return __builtin_ia32_sqrtsd((v2df) { x, 0.0 })[0];
-		}
-		else if constexpr(BAN::is_same_v<T, long double>)
-		{
-			asm("fsqrt" : "+t"(x));
-			return x;
-		}
-	}
-
-	template<floating_point T>
-	inline constexpr T cbrt(T value)
-	{
-		return pow<T>(value, (T)1.0 / (T)3.0);
-	}
-
-	template<floating_point T>
-	inline constexpr T sin(T x)
-	{
-		asm("fsin" : "+t"(x));
-		return x;
-	}
-
-	template<floating_point T>
-	inline constexpr T cos(T x)
-	{
-		asm("fcos" : "+t"(x));
-		return x;
-	}
-
-	template<floating_point T>
-	inline constexpr void sincos(T x, T& sin, T& cos)
-	{
-		asm("fsincos" : "=t"(cos), "=u"(sin) : "0"(x));
-	}
-
-	template<floating_point T>
-	inline constexpr T tan(T x)
-	{
-		T one, ret;
-		asm("fptan" : "=t"(one), "=u"(ret) : "0"(x));
-		return ret;
-	}
-
-	template<floating_point T>
-	inline constexpr T atan2(T y, T x)
-	{
-		asm("fpatan" : "+t"(x) : "u"(y) : "st(1)");
-		return x;
-	}
-
-	template<floating_point T>
-	inline constexpr T atan(T x)
-	{
-		return atan2<T>(x, (T)1.0);
-	}
-
-	template<floating_point T>
-	inline constexpr T asin(T x)
-	{
-		if (x == (T)0.0)
-			return (T)0.0;
-		if (x == (T)1.0)
-			return +numbers::pi_v<T> / (T)2.0;
-		if (x == (T)-1.0)
-			return -numbers::pi_v<T> / (T)2.0;
-		return (T)2.0 * atan<T>(x / ((T)1.0 + sqrt<T>((T)1.0 - x * x)));
-	}
-
-	template<floating_point T>
-	inline constexpr T acos(T x)
-	{
-		if (x == (T)0.0)
-			return numbers::pi_v<T> / (T)2.0;
-		if (x == (T)1.0)
-			return (T)0.0;
-		if (x == (T)-1.0)
-			return numbers::pi_v<T>;
-		return (T)2.0 * atan<T>(sqrt<T>((T)1.0 - x * x) / ((T)1.0 + x));
-	}
-
-	template<floating_point T>
-	inline constexpr T sinh(T x)
-	{
-		return (exp<T>(x) - exp<T>(-x)) / (T)2.0;
-	}
-
-	template<floating_point T>
-	inline constexpr T cosh(T x)
-	{
-		return (exp<T>(x) + exp<T>(-x)) / (T)2.0;
-	}
-
-	template<floating_point T>
-	inline constexpr T tanh(T x)
-	{
-		const T exp_px = exp<T>(+x);
-		const T exp_nx = exp<T>(-x);
-		return (exp_px - exp_nx) / (exp_px + exp_nx);
-	}
-
-	template<floating_point T>
-	inline constexpr T asinh(T x)
-	{
-		return log<T>(x + sqrt<T>(x * x + (T)1.0));
-	}
-
-	template<floating_point T>
-	inline constexpr T acosh(T x)
-	{
-		return log<T>(x + sqrt<T>(x * x - (T)1.0));
-	}
-
-	template<floating_point T>
-	inline constexpr T atanh(T x)
-	{
-		return (T)0.5 * log<T>(((T)1.0 + x) / ((T)1.0 - x));
-	}
-
-	template<floating_point T>
-	inline constexpr T hypot(T x, T y)
-	{
-		return sqrt<T>(x * x + y * y);
-	}
-
-#ifdef BAN_MATH_POP_OPTIONS
-#undef BAN_MATH_POP_OPTIONS
-#pragma GCC pop_options
-#endif
-
 }

BAN/include/BAN/Move.h

@@ -27,3 +27,6 @@ namespace BAN
 	}
 
 }
+
+inline void* operator new(size_t, void* addr)	{ return addr; }
+inline void* operator new[](size_t, void* addr)	{ return addr; }

BAN/include/BAN/New.h

@@ -9,12 +9,10 @@
 namespace BAN
 {
 	#if defined(__is_kernel)
-		static constexpr void*(*allocator)(size_t) = kmalloc;
+		static constexpr void*(&allocator)(size_t) = kmalloc;
-		static constexpr void*(*reallocator)(void*, size_t) = nullptr;
+		static constexpr void(&deallocator)(void*) = kfree;
-		static constexpr void(*deallocator)(void*) = kfree;
 	#else
-		static constexpr void*(*allocator)(size_t) = malloc;
+		static constexpr void*(&allocator)(size_t) = malloc;
-		static constexpr void*(*reallocator)(void*, size_t) = realloc;
+		static constexpr void(&deallocator)(void*) = free;
-		static constexpr void(*deallocator)(void*) = free;
 	#endif
 }

BAN/include/BAN/Numbers.h

@@ -1,28 +0,0 @@
-#pragma once
-
-#include <BAN/Traits.h>
-
-namespace BAN::numbers
-{
-
-	template<floating_point T> inline constexpr T e_v      = 2.71828182845904523536;
-	template<floating_point T> inline constexpr T log2e_v  = 1.44269504088896340736;
-	template<floating_point T> inline constexpr T lge_v    = 0.43429448190325182765;
-	template<floating_point T> inline constexpr T lg2_v    = 0.30102999566398119521;
-	template<floating_point T> inline constexpr T ln2_v    = 0.69314718055994530942;
-	template<floating_point T> inline constexpr T ln10_v   = 2.30258509299404568402;
-	template<floating_point T> inline constexpr T pi_v     = 3.14159265358979323846;
-	template<floating_point T> inline constexpr T sqrt2_v  = 1.41421356237309504880;
-	template<floating_point T> inline constexpr T sqrt3_v  = 1.73205080756887729353;
-
-	inline constexpr double e      = e_v<double>;
-	inline constexpr double log2e  = log2e_v<double>;
-	inline constexpr double lge    = lge_v<double>;
-	inline constexpr double lg2    = lge_v<double>;
-	inline constexpr double ln2    = ln2_v<double>;
-	inline constexpr double ln10   = ln10_v<double>;
-	inline constexpr double pi     = pi_v<double>;
-	inline constexpr double sqrt2  = sqrt2_v<double>;
-	inline constexpr double sqrt3  = sqrt3_v<double>;
-
-}

BAN/include/BAN/Optional.h

@@ -2,7 +2,6 @@
 
 #include <BAN/Assert.h>
 #include <BAN/Move.h>
-#include <BAN/PlacementNew.h>
 
 #include <stdint.h>
 
@@ -13,74 +12,64 @@ namespace BAN
 	class Optional
 	{
 	public:
-		constexpr Optional();
+		Optional();
-		constexpr Optional(Optional&&);
+		Optional(const T&);
-		constexpr Optional(const Optional&);
+		Optional(T&&);
-		constexpr Optional(const T&);
+		template<typename... Args>
-		constexpr Optional(T&&);
+		Optional(Args&&...);
 
 		~Optional();
 
-		constexpr Optional& operator=(Optional&&);
+		Optional& operator=(const Optional&);
-		constexpr Optional& operator=(const Optional&);
+		Optional& operator=(Optional&&);
 
 		template<typename... Args>
-		constexpr Optional& emplace(Args&&...) requires is_constructible_v<T, Args...>;
+		Optional& emplace(Args&&...);
 
-		constexpr T* operator->();
+		T* operator->();
-		constexpr const T* operator->() const;
+		const T* operator->() const;
 
-		constexpr T& operator*();
+		T& operator*();
-		constexpr const T& operator*() const;
+		const T& operator*() const;
 
-		constexpr bool has_value() const;
+		bool has_value() const;
 
-		constexpr T release_value();
+		T&& release_value();
-		constexpr T& value();
+		const T& value() const;
-		constexpr const T& value() const;
+		T& value();
-		constexpr T& value_or(T&);
-		constexpr const T& value_or(const T&) const;
 
-		constexpr void clear();
+		void clear();
 
 	private:
-		alignas(T) uint8_t m_storage[sizeof(T)] {};
+		alignas(T) uint8_t m_storage[sizeof(T)];
 		bool m_has_value { false };
 	};
 
 	template<typename T>
-	constexpr Optional<T>::Optional()
+	Optional<T>::Optional()
 		: m_has_value(false)
 	{}
 
 	template<typename T>
-	constexpr Optional<T>::Optional(Optional<T>&& other)
+	Optional<T>::Optional(const T& value)
-		: m_has_value(other.has_value())
-	{
-		if (other.has_value())
-			new (m_storage) T(move(other.release_value()));
-	}
-
-	template<typename T>
-	constexpr Optional<T>::Optional(const Optional<T>& other)
-		: m_has_value(other.has_value())
-	{
-		if (other.has_value())
-			new (m_storage) T(other.value());
-	}
-
-	template<typename T>
-	constexpr Optional<T>::Optional(const T& value)
 		: m_has_value(true)
 	{
 		new (m_storage) T(value);	
 	}
 
 	template<typename T>
-	constexpr Optional<T>::Optional(T&& value)
+	Optional<T>::Optional(T&& value)
 		: m_has_value(true)
 	{
-		new (m_storage) T(move(value));
+		new (m_storage) T(BAN::move(value));
+	}
+
+	template<typename T>
+	template<typename... Args>
+	Optional<T>::Optional(Args&&... args)
+		: m_has_value(true)
+	{
+		new (m_storage) T(BAN::forward<Args>(args)...);
 	}
 
 	template<typename T>
@@ -90,111 +79,97 @@ namespace BAN
 	}
 
 	template<typename T>
-	constexpr Optional<T>& Optional<T>::operator=(Optional&& other)
+	Optional<T>& Optional<T>::operator=(const Optional& other)
 	{
 		clear();
-		m_has_value = other.has_value();
 		if (other.has_value())
-			new (m_storage) T(move(other.release_value()));
+		{
+			m_has_value = true;
+			new (m_storage) T(other.value());
+		}
 		return *this;
 	}
 
 	template<typename T>
-	constexpr Optional<T>& Optional<T>::operator=(const Optional& other)
+	Optional<T>& Optional<T>::operator=(Optional&& other)
 	{
 		clear();
-		m_has_value = other.has_value();
 		if (other.has_value())
-			new (m_storage) T(other.value());
+		{
+			m_has_value = true;
+			new (m_storage) T(BAN::move(other.release_value()));
+		}
 		return *this;
 	}
 
 	template<typename T>
 	template<typename... Args>
-	constexpr Optional<T>& Optional<T>::emplace(Args&&... args) requires is_constructible_v<T, Args...>
+	Optional<T>& Optional<T>::emplace(Args&&... args)
 	{
 		clear();
 		m_has_value = true;
-		new (m_storage) T(forward<Args>(args)...);
+		new (m_storage) T(BAN::forward<Args>(args)...);
 		return *this;
 	}
 
 	template<typename T>
-	constexpr T* Optional<T>::operator->()
+	T* Optional<T>::operator->()
 	{
 		ASSERT(has_value());
 		return &value();
 	}
 
 	template<typename T>
-	constexpr const T* Optional<T>::operator->() const
+	const T* Optional<T>::operator->() const
 	{
 		ASSERT(has_value());
 		return &value();
 	}
 
 	template<typename T>
-	constexpr T& Optional<T>::operator*()
+	T& Optional<T>::operator*()
 	{
 		ASSERT(has_value());
 		return value();
 	}
 
 	template<typename T>
-	constexpr const T& Optional<T>::operator*() const
+	const T& Optional<T>::operator*() const
 	{
 		ASSERT(has_value());
 		return value();
 	}
 
 	template<typename T>
-	constexpr bool Optional<T>::has_value() const
+	bool Optional<T>::has_value() const
 	{
 		return m_has_value;
 	}
 
 	template<typename T>
-	constexpr T Optional<T>::release_value()
+	T&& Optional<T>::release_value()
 	{
 		ASSERT(has_value());
-		T released_value = move(value());
-		value().~T();
 		m_has_value = false;
-		return move(released_value);
+		return BAN::move((T&)m_storage);
 	}
 
 	template<typename T>
-	constexpr T& Optional<T>::value()
+	const T& Optional<T>::value() const
 	{
 		ASSERT(has_value());
-		return *reinterpret_cast<T*>(&m_storage);
+		return (const T&)m_storage;
 	}
 
 	template<typename T>
-	constexpr const T& Optional<T>::value() const
+	T& Optional<T>::value()
 	{
 		ASSERT(has_value());
-		return *reinterpret_cast<const T*>(&m_storage);
+		return (T&)m_storage;
 	}
 
 	template<typename T>
-	constexpr T& Optional<T>::value_or(T& empty)
+	void Optional<T>::clear()
-	{
-		if (!has_value())
-			return empty;
-		return value();
-	}
-
-	template<typename T>
-	constexpr const T& Optional<T>::value_or(const T& empty) const
-	{
-		if (!has_value())
-			return empty;
-		return value();
-	}
-
-	template<typename T>
-	constexpr void Optional<T>::clear()
 	{
 		if (m_has_value)
 			value().~T();

BAN/include/BAN/PlacementNew.h

@@ -1,10 +0,0 @@
-#pragma once
-
-#if __has_include(<new>)
-	#include <new>
-#else
-	#include <stddef.h>
-
-	inline void* operator new(size_t, void* addr) { return addr; }
-	inline void* operator new[](size_t, void* addr) { return addr; }
-#endif

BAN/include/BAN/PriorityQueue.h

@@ -1,64 +0,0 @@
-#pragma once
-
-#include "BAN/Errors.h"
-#include <BAN/Vector.h>
-#include <BAN/Heap.h>
-
-namespace BAN
-{
-
-	template<typename T, typename Comp = less<T>>
-	class PriorityQueue
-	{
-	public:
-		PriorityQueue() = default;
-		PriorityQueue(Comp comp)
-			: m_comp(comp)
-		{ }
-
-		ErrorOr<void> push(const T& value)
-		{
-			TRY(m_data.push_back(value));
-			push_heap(m_data.begin(), m_data.end());
-			return {};
-		}
-
-		ErrorOr<void> push(T&& value)
-		{
-			TRY(m_data.push_back(move(value)));
-			push_heap(m_data.begin(), m_data.end());
-			return {};
-		}
-
-		template<typename... Args>
-		ErrorOr<void> emplace(Args&&... args) requires is_constructible_v<T, Args...>
-		{
-			TRY(m_data.emplace_back(forward<Args>(args)...));
-			push_heap(m_data.begin(), m_data.end());
-			return {};
-		}
-
-		void pop()
-		{
-			pop_heap(m_data.begin(), m_data.end());
-			m_data.pop_back();
-		}
-
-		BAN::ErrorOr<void> reserve(Vector<T>::size_type size)
-		{
-			return m_data.reserve(size);
-		}
-
-		T& top() { return m_data.front(); }
-		const T& top() const { return m_data.front(); }
-
-		bool empty() const { return m_data.empty(); }
-		Vector<T>::size_type size() const { return m_data.size(); }
-		Vector<T>::size_type capacity() const { return m_data.capacity(); }
-
-	private:
-		Comp m_comp;
-		Vector<T> m_data;
-	};
-
-}

BAN/include/BAN/Queue.h

@@ -5,7 +5,6 @@
 #include <BAN/Math.h>
 #include <BAN/Move.h>
 #include <BAN/New.h>
-#include <BAN/PlacementNew.h>
 
 namespace BAN
 {
@@ -31,7 +30,7 @@ namespace BAN
 		ErrorOr<void> push(T&&);
 		ErrorOr<void> push(const T&);
 		template<typename... Args>
-		ErrorOr<void> emplace(Args&&...) requires is_constructible_v<T, Args...>;
+		ErrorOr<void> emplace(Args&&...);
 
 		ErrorOr<void> reserve(size_type);
 		ErrorOr<void> shrink_to_fit();
@@ -45,7 +44,6 @@ namespace BAN
 		void clear();
 
 		bool empty() const;
-		size_type capacity() const;
 		size_type size() const;
 
 		const T& front() const;
@@ -131,7 +129,7 @@ namespace BAN
 
 	template<typename T>
 	template<typename... Args>
-	ErrorOr<void> Queue<T>::emplace(Args&&... args) requires is_constructible_v<T, Args...>
+	ErrorOr<void> Queue<T>::emplace(Args&&... args)
 	{
 		TRY(ensure_capacity(m_size + 1));
 		new (m_data + m_size) T(forward<Args>(args)...);
@@ -187,12 +185,6 @@ namespace BAN
 		return m_size == 0;
 	}
 
-	template<typename T>
-	typename Queue<T>::size_type Queue<T>::capacity() const
-	{
-		return m_capacity;
-	}
-
 	template<typename T>
 	typename Queue<T>::size_type Queue<T>::size() const
 	{

BAN/include/BAN/RefPtr.h

@@ -1,6 +1,5 @@
 #pragma once
 
-#include <BAN/Atomic.h>
 #include <BAN/Errors.h>
 #include <BAN/Move.h>
 #include <BAN/NoCopyMove.h>
@@ -23,36 +22,24 @@ namespace BAN
 
 		void ref() const
 		{
-			uint32_t old = m_ref_count.fetch_add(1, MemoryOrder::memory_order_relaxed);
+			ASSERT(m_ref_count > 0);
-			ASSERT(old > 0);
+			m_ref_count++;
-		}
-
-		bool try_ref() const
-		{
-			uint32_t expected = m_ref_count.load(MemoryOrder::memory_order_relaxed);
-			for (;;)
-			{
-				if (expected == 0)
-					return false;
-				if (m_ref_count.compare_exchange(expected, expected + 1, MemoryOrder::memory_order_acquire))
-					return true;
-			}
 		}
 
 		void unref() const
 		{
-			uint32_t old = m_ref_count.fetch_sub(1);
+			ASSERT(m_ref_count > 0);
-			ASSERT(old > 0);
+			m_ref_count--;
-			if (old == 1)
+			if (m_ref_count == 0)
-				delete static_cast<const T*>(this);
+				delete (const T*)this;
 		}
 
 	protected:
 		RefCounted() = default;
-		virtual ~RefCounted() { ASSERT(m_ref_count == 0); }
+		~RefCounted() { ASSERT(m_ref_count == 0); }
 
 	private:
-		mutable Atomic<uint32_t> m_ref_count = 1;
+		mutable uint32_t m_ref_count = 1;
 	};
 
 	template<typename T>
@@ -76,9 +63,8 @@ namespace BAN
 			return ptr;
 		}
 
-		// NOTE: don't use is_constructible_v<T, Args...> as RefPtr<T> is allowed with friends
 		template<typename... Args>
-		static ErrorOr<RefPtr> create(Args&&... args) requires requires(Args&&... args) { T(forward<Args>(args)...); }
+		static ErrorOr<RefPtr> create(Args&&... args)
 		{
 			T* pointer = new T(forward<Args>(args)...);
 			if (pointer == nullptr)
@@ -138,11 +124,8 @@ namespace BAN
 		T* operator->() { return ptr(); }
 		const T* operator->() const { return ptr(); }
 
-		bool operator==(RefPtr other) const { return m_pointer == other.m_pointer; }
-		bool operator!=(RefPtr other) const { return m_pointer != other.m_pointer; }
-
 		bool empty() const { return m_pointer == nullptr; }
-		explicit operator bool() const { return m_pointer; }
+		operator bool() const { return m_pointer; }
 
 		void clear()
 		{

BAN/include/BAN/Sort.h

@@ -1,165 +0,0 @@
-#pragma once
-
-#include <BAN/Heap.h>
-#include <BAN/Math.h>
-#include <BAN/Swap.h>
-#include <BAN/Traits.h>
-#include <BAN/Vector.h>
-
-namespace BAN::sort
-{
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void exchange_sort(It begin, It end, Comp comp = {})
-	{
-		for (It lhs = begin; lhs != end; ++lhs)
-			for (It rhs = next(lhs, 1); rhs != end; ++rhs)
-				if (!comp(*lhs, *rhs))
-					swap(*lhs, *rhs);
-	}
-
-	namespace detail
-	{
-
-		template<typename It, typename Comp>
-		It partition(It begin, It end, Comp comp)
-		{
-			It pivot = prev(end, 1);
-
-			It it1 = begin;
-			for (It it2 = begin; it2 != pivot; ++it2)
-			{
-				if (comp(*it2, *pivot))
-				{
-					swap(*it1, *it2);
-					++it1;
-				}
-			}
-
-			swap(*it1, *pivot);
-
-			return it1;
-		}
-
-	}
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void quick_sort(It begin, It end, Comp comp = {})
-	{
-		if (distance(begin, end) <= 1)
-			return;
-		It mid = detail::partition(begin, end, comp);
-		quick_sort(begin, mid, comp);
-		quick_sort(++mid, end, comp);
-	}
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void insertion_sort(It begin, It end, Comp comp = {})
-	{
-		if (distance(begin, end) <= 1)
-			return;
-		for (It it1 = next(begin, 1); it1 != end; ++it1)
-		{
-			auto x = move(*it1);
-			It it2 = it1;
-			for (; it2 != begin && comp(x, *prev(it2, 1)); --it2)
-				*it2 = move(*prev(it2, 1));
-			*it2 = move(x);
-		}
-	}
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void heap_sort(It begin, It end, Comp comp = {})
-	{
-		make_heap(begin, end, comp);
-		sort_heap(begin, end, comp);
-	}
-
-	namespace detail
-	{
-
-		template<typename It, typename Comp>
-		void intro_sort_impl(It begin, It end, size_t max_depth, Comp comp)
-		{
-			if (distance(begin, end) <= 16)
-				return insertion_sort(begin, end, comp);
-			if (max_depth == 0)
-				return heap_sort(begin, end, comp);
-			It mid = detail::partition(begin, end, comp);
-			intro_sort_impl(begin, mid, max_depth - 1, comp);
-			intro_sort_impl(++mid, end, max_depth - 1, comp);
-		}
-
-	}
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void intro_sort(It begin, It end, Comp comp = {})
-	{
-		const size_t len = distance(begin, end);
-		if (len <= 1)
-			return;
-		detail::intro_sort_impl(begin, end, 2 * Math::ilog2(len), comp);
-	}
-
-	namespace detail
-	{
-
-		template<unsigned_integral T>
-		consteval T lsb_index(T value)
-		{
-			for (T result = 0;; result++)
-				if (value & (1 << result))
-					return result;
-		}
-
-	}
-
-	template<typename It, size_t radix = 256>
-	requires is_unsigned_v<it_value_type_t<It>> && (radix > 0 && (radix & (radix - 1)) == 0)
-	BAN::ErrorOr<void> radix_sort(It begin, It end)
-	{
-		using value_type = it_value_type_t<It>;
-
-		const size_t len = distance(begin, end);
-		if (len <= 1)
-			return {};
-
-		Vector<value_type> temp;
-		TRY(temp.resize(len));
-
-		Vector<size_t> counts;
-		TRY(counts.resize(radix));
-
-		constexpr size_t mask  = radix - 1;
-		constexpr size_t shift = detail::lsb_index(radix);
-
-		for (size_t s = 0; s < sizeof(value_type) * 8; s += shift)
-		{
-			for (auto& cnt : counts)
-				cnt = 0;
-			for (It it = begin; it != end; ++it)
-				counts[(*it >> s) & mask]++;
-
-			for (size_t i = 0; i < radix - 1; i++)
-				counts[i + 1] += counts[i];
-
-			for (It it = end; it != begin;)
-			{
-				--it;
-				temp[--counts[(*it >> s) & mask]] = *it;
-			}
-
-			for (size_t j = 0; j < temp.size(); j++)
-				*next(begin, j) = temp[j];
-		}
-
-		return {};
-	}
-
-	template<typename It, typename Comp = less<it_value_type_t<It>>>
-	void sort(It begin, It end, Comp comp = {})
-	{
-		return intro_sort(begin, end, comp);
-	}
-
-}

BAN/include/BAN/Span.h

@@ -14,89 +14,119 @@ namespace BAN
 	public:
 		using value_type = T;
 		using size_type = size_t;
-		using iterator = IteratorSimple<value_type, Span>;
+		using iterator = IteratorSimple<T, Span>;
-		using const_iterator = ConstIteratorSimple<value_type, Span>;
+		using const_iterator = ConstIteratorSimple<T, Span>;
-
-	private:
-		template<typename S>
-		static inline constexpr bool can_init_from_v = is_same_v<value_type, const S> || is_same_v<value_type, S>;
 
 	public:
 		Span() = default;
-		Span(value_type* data, size_type size)
+		Span(T*, size_type);
-			: m_data(data)
+		Span(Span<T>&);
-			, m_size(size)
-		{ }
-
 		template<typename S>
-		Span(const Span<S>& other) requires can_init_from_v<S>
+		requires(is_same_v<T, const S>)
-			: m_data(other.m_data)
+		Span(const Span<S>&);
-			, m_size(other.m_size)
-		{ }
-		template<typename S>
-		Span(Span<S>&& other) requires can_init_from_v<S>
-			: m_data(other.m_data)
-			, m_size(other.m_size)
-		{
-			other.clear();
-		}
-
-		template<typename S>
-		Span& operator=(const Span<S>& other) requires can_init_from_v<S>
-		{
-			m_data = other.m_data;
-			m_size = other.m_size;
-			return *this;
-		}
-		template<typename S>
-		Span& operator=(Span<S>&& other) requires can_init_from_v<S>
-		{
-			m_data = other.m_data;
-			m_size = other.m_size;
-			return *this;
-		}
 
 		iterator begin() { return iterator(m_data); }
 		iterator end() { return iterator(m_data + m_size); }
 		const_iterator begin() const { return const_iterator(m_data); }
 		const_iterator end() const { return const_iterator(m_data + m_size); }
 
-		value_type& operator[](size_type index) const
+		T& operator[](size_type);
+		const T& operator[](size_type) const;
+
+		T* data();
+		const T* data() const;
+
+		bool empty() const;
+		size_type size() const;
+
+		void clear();
+
+		Span slice(size_type, size_type = ~size_type(0));
+
+	private:
+		T* m_data = nullptr;
+		size_type m_size = 0;
+	};
+
+	template<typename T>
+	Span<T>::Span(T* data, size_type size)
+		: m_data(data)
+		, m_size(size)
 	{
+	}
+
+	template<typename T>
+	Span<T>::Span(Span& other)
+		: m_data(other.data())
+		, m_size(other.size())
+	{
+	}
+
+	template<typename T>
+	template<typename S>
+	requires(is_same_v<T, const S>)
+	Span<T>::Span(const Span<S>& other)
+		: m_data(other.data())
+		, m_size(other.size())
+	{
+	}
+
+	template<typename T>
+	T& Span<T>::operator[](size_type index)
+	{
+		ASSERT(m_data);
 		ASSERT(index < m_size);
 		return m_data[index];
 	}
 
-		value_type* data() const
+	template<typename T>
+	const T& Span<T>::operator[](size_type index) const
+	{
+		ASSERT(m_data);
+		ASSERT(index < m_size);
+		return m_data[index];
+	}
+
+	template<typename T>
+	T* Span<T>::data()
 	{
 		return m_data;
 	}
 
-		bool empty() const { return m_size == 0; }
+	template<typename T>
-		size_type size() const { return m_size; }
+	const T* Span<T>::data() const
+	{
+		return m_data;
+	}
 
-		void clear()
+	template<typename T>
+	bool Span<T>::empty() const
+	{
+		return m_size == 0;
+	}
+
+	template<typename T>
+	typename Span<T>::size_type Span<T>::size() const
+	{
+		return m_size;
+	}
+
+	template<typename T>
+	void Span<T>::clear()
 	{
 		m_data = nullptr;
 		m_size = 0;
 	}
 
-		Span slice(size_type start, size_type length = ~size_type(0)) const
+	template<typename T>
+	Span<T> Span<T>::slice(size_type start, size_type length)
 	{
+		ASSERT(m_data);
 		ASSERT(start <= m_size);
 		if (length == ~size_type(0))
 			length = m_size - start;
-			ASSERT(m_size - start >= length);
+		ASSERT(start + length <= m_size);
-			return Span(m_data + start, length);
+		return Span(m_data + start, m_size - start - length);
 	}
 
-		Span<const value_type> as_const() const { return *this; }
-
-	private:
-		value_type* m_data = nullptr;
-		size_type m_size = 0;
-
-		friend class Span<const value_type>;
-	};
-
 }

BAN/include/BAN/String.h

@@ -1,11 +1,10 @@
 #pragma once
 
 #include <BAN/Errors.h>
+#include <BAN/ForwardList.h>
 #include <BAN/Formatter.h>
 #include <BAN/Hash.h>
 #include <BAN/Iterators.h>
-#include <BAN/New.h>
-#include <BAN/StringView.h>
 
 namespace BAN
 {
@@ -14,320 +13,85 @@ namespace BAN
 	{
 	public:
 		using size_type = size_t;
-		using value_type = char;
 		using iterator = IteratorSimple<char, String>;
 		using const_iterator = ConstIteratorSimple<char, String>;
-		static constexpr size_type sso_capacity = 15;
 
 	public:
-		String() {}
+		String();
-		String(const String& other) { *this = other; }
+		String(const String&);
-		String(String&& other) { *this = move(other); }
+		String(String&&);
-		String(StringView other) { *this = other; }
+		String(StringView);
-		~String() { clear(); }
+		~String();
 
 		template<typename... Args>
-		static BAN::ErrorOr<String> formatted(const char* format, Args&&... args)
+		static String formatted(const char* format, const Args&... args);
+
+		String& operator=(const String&);
+		String& operator=(String&&);
+		String& operator=(StringView);
+
+		ErrorOr<void> push_back(char);
+		ErrorOr<void> insert(char, size_type);
+		ErrorOr<void> insert(StringView, size_type);
+		ErrorOr<void> append(StringView);
+		ErrorOr<void> append(const String&);
+
+		void pop_back();
+		void remove(size_type);
+		void erase(size_type, size_type);
+
+		void clear();
+
+		const_iterator begin() const { return const_iterator(m_data); }
+		iterator begin() { return iterator(m_data); }
+		const_iterator end() const { return const_iterator(m_data + m_size); }
+		iterator end() { return iterator(m_data + m_size); }
+
+		char front() const	{ ASSERT(!empty()); return m_data[0]; }
+		char& front()		{ ASSERT(!empty()); return m_data[0]; }
+
+		char back() const	{ ASSERT(!empty()); return m_data[m_size - 1]; }
+		char& back()		{ ASSERT(!empty()); return m_data[m_size - 1]; }
+
+		char operator[](size_type) const;
+		char& operator[](size_type);
+
+		bool operator==(const String&) const;
+		bool operator==(StringView) const;
+		bool operator==(const char*) const;
+
+		ErrorOr<void> resize(size_type, char = '\0');
+		ErrorOr<void> reserve(size_type);
+		ErrorOr<void> shrink_to_fit();
+
+		StringView sv() const;
+
+		bool empty() const;
+		size_type size() const;
+		size_type capacity() const;
+
+		const char* data() const;
+
+	private:
+		ErrorOr<void> ensure_capacity(size_type);
+
+		ErrorOr<void> copy_impl(StringView);
+		void move_impl(String&&);
+
+	private:
+		char*		m_data		= nullptr;
+		size_type	m_capacity	= 0;
+		size_type	m_size		= 0;	
+	};
+
+	template<typename... Args>
+	String String::formatted(const char* format, const Args&... args)
 	{
-			size_type length = 0;
-			BAN::Formatter::print([&](char) { length++; }, format, BAN::forward<Args>(args)...);
-
 		String result;
-			TRY(result.reserve(length));
+		BAN::Formatter::print([&](char c){ MUST(result.push_back(c)); }, format, args...);
-			BAN::Formatter::print([&](char c){ MUST(result.push_back(c)); }, format, BAN::forward<Args>(args)...);
-
 		return result;
 	}
 
-		String& operator=(const String& other)
-		{
-			clear();
-			MUST(ensure_capacity(other.size()));
-			memcpy(data(), other.data(), other.size() + 1);
-			m_size = other.size();
-			return *this;
-		}
-
-		String& operator=(String&& other)
-		{
-			clear();
-
-			if (other.has_sso())
-				memcpy(data(), other.data(), other.size() + 1);
-			else
-			{
-				m_storage.general_storage = other.m_storage.general_storage;
-				m_has_sso = false;
-			}
-			m_size = other.m_size;
-
-			other.m_size = 0;
-			other.m_storage.sso_storage = SSOStorage();
-			other.m_has_sso = true;
-
-			return *this;
-		}
-
-		String& operator=(StringView other)
-		{
-			clear();
-			MUST(ensure_capacity(other.size()));
-			memcpy(data(), other.data(), other.size());
-			m_size = other.size();
-			data()[m_size] = '\0';
-			return *this;
-		}
-
-		ErrorOr<void> push_back(char c)
-		{
-			TRY(ensure_capacity(m_size + 1));
-			data()[m_size] = c;
-			m_size++;
-			data()[m_size] = '\0';
-			return {};
-		}
-
-		ErrorOr<void> insert(char c, size_type index)
-		{
-			ASSERT(index <= m_size);
-			TRY(ensure_capacity(m_size + 1));
-			memmove(data() + index + 1, data() + index, m_size - index);
-			data()[index] = c;
-			m_size++;
-			data()[m_size] = '\0';
-			return {};
-		}
-
-		ErrorOr<void> insert(StringView str, size_type index)
-		{
-			ASSERT(index <= m_size);
-			TRY(ensure_capacity(m_size + str.size()));
-			memmove(data() + index + str.size(), data() + index, m_size - index);
-			memcpy(data() + index, str.data(), str.size());
-			m_size += str.size();
-			data()[m_size] = '\0';
-			return {};
-		}
-
-		ErrorOr<void> append(StringView str)
-		{
-			TRY(ensure_capacity(m_size + str.size()));
-			memcpy(data() + m_size, str.data(), str.size());
-			m_size += str.size();
-			data()[m_size] = '\0';
-			return {};
-		}
-
-		void pop_back()
-		{
-			ASSERT(m_size > 0);
-			m_size--;
-			data()[m_size] = '\0';
-		}
-
-		void remove(size_type index)
-		{
-			ASSERT(index < m_size);
-			memmove(data() + index, data() + index + 1, m_size - index);
-			m_size--;
-			data()[m_size] = '\0';
-		}
-
-		void clear()
-		{
-			if (!has_sso())
-			{
-				deallocator(m_storage.general_storage.data);
-				m_storage.sso_storage = SSOStorage();
-				m_has_sso = true;
-			}
-			m_size = 0;
-			data()[m_size] = '\0';
-		}
-
-		const_iterator begin() const	{ return const_iterator(data()); }
-		iterator begin()				{ return iterator(data()); }
-		const_iterator end() const		{ return const_iterator(data() + size()); }
-		iterator end()					{ return iterator(data() + size()); }
-
-		char front() const	{ ASSERT(m_size > 0); return data()[0]; }
-		char& front()		{ ASSERT(m_size > 0); return data()[0]; }
-
-		char back() const	{ ASSERT(m_size > 0); return data()[m_size - 1]; }
-		char& back()		{ ASSERT(m_size > 0); return data()[m_size - 1]; }
-
-		char operator[](size_type index) const	{ ASSERT(index < m_size); return data()[index]; }
-		char& operator[](size_type index)		{ ASSERT(index < m_size); return data()[index]; }
-
-		bool operator==(const String& str) const
-		{
-			if (size() != str.size())
-				return false;
-			for (size_type i = 0; i < m_size; i++)
-				if (data()[i] != str.data()[i])
-					return false;
-			return true;
-		}
-
-		bool operator==(StringView str) const
-		{
-			if (size() != str.size())
-				return false;
-			for (size_type i = 0; i < m_size; i++)
-				if (data()[i] != str.data()[i])
-					return false;
-			return true;
-		}
-
-		bool operator==(const char* cstr) const
-		{
-			for (size_type i = 0; i < m_size; i++)
-				if (data()[i] != cstr[i])
-					return false;
-			if (cstr[size()] != '\0')
-				return false;
-			return true;
-		}
-
-		ErrorOr<void> resize(size_type new_size, char init_c = '\0')
-		{
-			if (m_size == new_size)
-				return {};
-
-			// expanding
-			if (m_size < new_size)
-			{
-				TRY(ensure_capacity(new_size));
-				memset(data() + m_size, init_c, new_size - m_size);
-				m_size = new_size;
-				data()[m_size] = '\0';
-				return {};
-			}
-
-			m_size = new_size;
-			data()[m_size] = '\0';
-			return {};
-		}
-
-		ErrorOr<void> reserve(size_type new_size)
-		{
-			TRY(ensure_capacity(new_size));
-			return {};
-		}
-
-		ErrorOr<void> shrink_to_fit()
-		{
-			if (has_sso())
-				return {};
-
-			if (fits_in_sso())
-			{
-				char* data = m_storage.general_storage.data;
-				m_storage.sso_storage = SSOStorage();
-				m_has_sso = true;
-				memcpy(this->data(), data, m_size + 1);
-				deallocator(data);
-				return {};
-			}
-
-			GeneralStorage& storage = m_storage.general_storage;
-			if (storage.capacity == m_size)
-				return {};
-
-			char* new_data = (char*)allocator(m_size + 1);
-			if (new_data == nullptr)
-				return Error::from_errno(ENOMEM);
-
-			memcpy(new_data, storage.data, m_size);
-			deallocator(storage.data);
-
-			storage.capacity = m_size;
-			storage.data = new_data;
-
-			return {};
-		}
-
-		StringView sv() const	{ return StringView(data(), size()); }
-
-		bool empty() const		{ return m_size == 0; }
-		size_type size() const	{ return m_size; }
-
-		size_type capacity() const
-		{
-			if (has_sso())
-				return sso_capacity;
-			return m_storage.general_storage.capacity;
-		}
-
-		char* data()
-		{
-			if (has_sso())
-				return m_storage.sso_storage.data;
-			return m_storage.general_storage.data;
-		}
-
-		const char* data() const
-		{
-			if (has_sso())
-				return m_storage.sso_storage.data;
-			return m_storage.general_storage.data;
-		}
-
-	private:
-		ErrorOr<void> ensure_capacity(size_type new_size)
-		{
-			if (m_size >= new_size)
-				return {};
-			if (has_sso() && fits_in_sso(new_size))
-				return {};
-
-			char* new_data = (char*)allocator(new_size + 1);
-			if (new_data == nullptr)
-				return Error::from_errno(ENOMEM);
-
-			if (m_size)
-				memcpy(new_data, data(), m_size + 1);
-
-			if (has_sso())
-			{
-				m_storage.general_storage = GeneralStorage();
-				m_has_sso = false;
-			}
-			else
-				deallocator(m_storage.general_storage.data);
-
-			auto& storage = m_storage.general_storage;
-			storage.capacity = new_size;
-			storage.data = new_data;
-
-			return {};
-		}
-
-		bool has_sso() const { return m_has_sso; }
-
-		bool fits_in_sso() const { return fits_in_sso(m_size); }
-		static bool fits_in_sso(size_type size) { return size < sso_capacity; }
-
-	private:
-		struct SSOStorage
-		{
-			char data[sso_capacity + 1] {};
-		};
-		struct GeneralStorage
-		{
-			size_type capacity	{ 0 };
-			char* data			{ nullptr };
-		};
-
-	private:
-		union {
-			SSOStorage sso_storage;
-			GeneralStorage general_storage;
-		} m_storage										{ .sso_storage = SSOStorage() };
-		size_type m_size	: sizeof(size_type) * 8 - 1	{ 0 };
-		size_type m_has_sso	: 1							{ true };
-	};
-
 	template<>
 	struct hash<String>
 	{
@@ -353,9 +117,10 @@ namespace BAN::Formatter
 {
 
 	template<typename F>
-	void print_argument(F putc, const String& string, const ValueFormat& format)
+	void print_argument(F putc, const String& string, const ValueFormat&)
 	{
-		print_argument(putc, string.sv(), format);
+		for (String::size_type i = 0; i < string.size(); i++)
+			putc(string[i]);
 	}
 
 }

BAN/include/BAN/StringView.h

@@ -1,11 +1,8 @@
 #pragma once
 
-#include <BAN/Formatter.h>
 #include <BAN/ForwardList.h>
-#include <BAN/Hash.h>
+#include <BAN/Formatter.h>
 #include <BAN/Iterators.h>
-#include <BAN/Optional.h>
-#include <BAN/Vector.h>
 
 namespace BAN
 {
@@ -14,245 +11,55 @@ namespace BAN
 	{
 	public:
 		using size_type = size_t;
-		using value_type = char;
 		using const_iterator = ConstIteratorSimple<char, StringView>;
 
 	public:
-		constexpr StringView() {}
+		StringView();
-		constexpr StringView(const char* string, size_type len = -1)
-		{
-			if (len == size_type(-1))
-				for (len = 0; string[len];)
-					len++;
-			m_data = string;
-			m_size = len;
-		}
 		StringView(const String&);
+		StringView(const char*, size_type = -1);
 
-		constexpr const_iterator begin() const { return const_iterator(m_data); }
+		const_iterator begin() const { return const_iterator(m_data); }
-		constexpr const_iterator end() const { return const_iterator(m_data + m_size); }
+		const_iterator end() const { return const_iterator(m_data + m_size); }
 
-		constexpr char operator[](size_type index) const
+		char operator[](size_type) const;
-		{
-			ASSERT(index < m_size);
-			return m_data[index];
-		}
 
-		constexpr bool operator==(StringView other) const
+		bool operator==(const String&) const;
-		{
+		bool operator==(StringView) const;
-			if (m_size != other.m_size)
+		bool operator==(const char*) const;
-				return false;
-			for (size_type i = 0; i < m_size; i++)
-				if (m_data[i] != other.m_data[i])
-					return false;
-			return true;
-		}
 
-		constexpr bool operator==(const char* other) const
+		StringView substring(size_type, size_type = -1) const;
-		{
-			for (size_type i = 0; i < m_size; i++)
-				if (m_data[i] != other[i])
-					return false;
-			return other[m_size] == '\0';
-		}
 
-		constexpr StringView substring(size_type index, size_type len = -1) const
+		ErrorOr<Vector<StringView>> split(char, bool = false);
-		{
+		ErrorOr<Vector<StringView>> split(bool(*comp)(char), bool = false);
-			ASSERT(index <= m_size);
-			if (len == size_type(-1))
-				len = m_size - index;
-			ASSERT(len <= m_size - index); // weird order to avoid overflow
-			StringView result;
-			result.m_data = m_data + index;
-			result.m_size = len;
-			return result;
-		}
 
-		ErrorOr<Vector<StringView>> split(char delim, bool allow_empties = false) const
+		char back() const;
-		{
+		char front() const;
-			size_type count = 0;
-			{
-				size_type start = 0;
-				for (size_type i = 0; i < m_size; i++)
-				{
-					if (m_data[i] == delim)
-					{
-						if (allow_empties || start != i)
-							count++;
-						start = i + 1;
-					}
-				}
-				if (start != m_size)
-					count++;
-			}
 
-			Vector<StringView> result;
+		bool contains(char) const;
-			TRY(result.reserve(count));
+		size_type count(char) const;
 
-			size_type start = 0;
+		bool empty() const;
-			for (size_type i = 0; i < m_size; i++)
+		size_type size() const;
-			{
-				if (m_data[i] == delim)
-				{
-					if (allow_empties || start != i)
-						TRY(result.push_back(this->substring(start, i - start)));
-					start = i + 1;
-				}
-			}
-			if (start < m_size || (start == m_size && allow_empties))
-				TRY(result.push_back(this->substring(start)));
-			return result;
-		}
 		
-		ErrorOr<Vector<StringView>> split(bool(*comp)(char), bool allow_empties = false) const
+		const char* data() const;
-		{
-			size_type count = 0;
-			{
-				size_type start = 0;
-				for (size_type i = 0; i < m_size; i++)
-				{
-					if (comp(m_data[i]))
-					{
-						if (allow_empties || start != i)
-							count++;
-						start = i + 1;
-					}
-				}
-				if (start != m_size)
-					count++;
-			}
-
-			Vector<StringView> result;
-			TRY(result.reserve(count));
-
-			size_type start = 0;
-			for (size_type i = 0; i < m_size; i++)
-			{
-				if (comp(m_data[i]))
-				{
-					if (allow_empties || start != i)
-						TRY(result.push_back(this->substring(start, i - start)));
-					start = i + 1;
-				}
-			}
-			if (start < m_size || (start == m_size && allow_empties))
-				TRY(result.push_back(this->substring(start)));
-			return result;
-		}
-
-		constexpr char back() const
-		{
-			ASSERT(m_size > 0);
-			return m_data[m_size - 1];
-		}
-
-		constexpr char front() const
-		{
-			ASSERT(m_size > 0);
-			return m_data[0];
-		}
-
-		BAN::Optional<size_type> find(char ch) const
-		{
-			for (size_type i = 0; i < m_size; i++)
-				if (m_data[i] == ch)
-					return i;
-			return {};
-		}
-
-		BAN::Optional<size_type> find(bool(*comp)(char)) const
-		{
-			for (size_type i = 0; i < m_size; i++)
-				if (comp(m_data[i]))
-					return i;
-			return {};
-		}
-
-		BAN::Optional<size_type> rfind(char ch) const
-		{
-			for (size_type i = m_size; i > 0; i--)
-				if (m_data[i - 1] == ch)
-					return i - 1;
-			return {};
-		}
-
-		BAN::Optional<size_type> rfind(bool(*comp)(char)) const
-		{
-			for (size_type i = m_size; i > 0; i--)
-				if (comp(m_data[i - 1]))
-					return i - 1;
-			return {};
-		}
-
-		constexpr bool starts_with(BAN::StringView target) const
-		{
-			if (target.size() > m_size)
-				return false;
-			for (size_type i = 0; i < target.size(); i++)
-				if (m_data[i] != target[i])
-					return false;
-			return true;
-		}
-
-		constexpr bool contains(char ch) const
-		{
-			for (size_type i = 0; i < m_size; i++)
-				if (m_data[i] == ch)
-					return true;
-			return false;
-		}
-
-		constexpr size_type count(char ch) const
-		{
-			size_type result = 0;
-			for (size_type i = 0; i < m_size; i++)
-				if (m_data[i] == ch)
-					result++;
-			return result;
-		}
-
-		constexpr bool empty() const { return m_size == 0; }
-		constexpr size_type size() const { return m_size; }
-		constexpr const char* data() const { return m_data; }
 
 	private:
 		const char*	m_data = nullptr;
 		size_type	m_size = 0;
 	};
 
-	template<>
-	struct hash<StringView>
-	{
-		hash_t operator()(StringView string) const
-		{
-			constexpr hash_t FNV_offset_basis = 0x811c9dc5;
-			constexpr hash_t FNV_prime = 0x01000193;
-
-			hash_t hash = FNV_offset_basis;
-			for (StringView::size_type i = 0; i < string.size(); i++)
-			{
-				hash *= FNV_prime;
-				hash ^= (uint8_t)string[i];
-			}
-
-			return hash;
-		}
-	};
-
 }
 
-inline constexpr BAN::StringView operator""_sv(const char* str, BAN::StringView::size_type len) { return BAN::StringView(str, len); }
+inline BAN::StringView operator""sv(const char* str, BAN::StringView::size_type len) { return BAN::StringView(str, len); }
 
 namespace BAN::Formatter
 {
 
 	template<typename F>
-	void print_argument(F putc, const StringView& sv, const ValueFormat& format)
+	void print_argument(F putc, const StringView& sv, const ValueFormat&)
 	{
 		for (StringView::size_type i = 0; i < sv.size(); i++)
 			putc(sv[i]);
-		for (int i = sv.size(); i < format.fill; i++)
-			putc(' ');
 	}
 
 }

BAN/include/BAN/Swap.h

@@ -1,16 +0,0 @@
-#pragma once
-
-#include <BAN/Move.h>
-
-namespace BAN
-{
-
-	template<typename T>
-	void swap(T& lhs, T& rhs)
-	{
-		T tmp = move(lhs);
-		lhs = move(rhs);
-		rhs = move(tmp);
-	}
-
-}

BAN/include/BAN/Traits.h

@@ -3,10 +3,10 @@
 namespace BAN
 {
 
-	template<typename T> struct remove_reference { using type = T; };
+	template<typename T> struct remove_refenrece { using type = T; };
-	template<typename T> struct remove_reference<T&> { using type =  T; };
+	template<typename T> struct remove_refenrece<T&> { using type =  T; };
-	template<typename T> struct remove_reference<T&&> { using type = T; };
+	template<typename T> struct remove_refenrece<T&&> { using type = T; };
-	template<typename T> using remove_reference_t = typename remove_reference<T>::type;
+	template<typename T> using remove_reference_t = typename remove_refenrece<T>::type;
 
 	template<typename T> struct remove_const { using type = T; };
 	template<typename T> struct remove_const<const T> { using type = T; };
@@ -34,36 +34,18 @@ namespace BAN
 	template<typename T1, typename T2> struct either_or<true, T1, T2> { using type = T1; };
 	template<bool B, typename T1, typename T2> using either_or_t = typename either_or<B, T1, T2>::type;
 
-	template<typename T, T V> struct integral_constant { static constexpr T value = V; };
+	struct true_type { static constexpr bool value = true; };
-	template<typename T, T V > inline constexpr T integral_constant_v = integral_constant<T, V>::value;
+	struct false_type { static constexpr bool value = false; };
-	using true_type = integral_constant<bool, true>;
-	using false_type = integral_constant<bool, false>;
 
 	template<typename T, typename S>	struct is_same			: false_type {};
 	template<typename T>				struct is_same<T, T>	: true_type {};
 	template<typename T, typename S> inline constexpr bool is_same_v = is_same<T, S>::value;
-	template<typename T, typename S> concept same_as = BAN::is_same_v<T, S>;
 
 	template<typename T> struct is_lvalue_reference		: false_type {};
 	template<typename T> struct is_lvalue_reference<T&>	: true_type {};
 	template<typename T> inline constexpr bool is_lvalue_reference_v = is_lvalue_reference<T>::value;
 	template<typename T> concept lvalue_reference = is_lvalue_reference_v<T>;
 
-	template<typename T, typename... Args> struct is_constructible { static constexpr bool value = __is_constructible(T, Args...); };
-	template<typename T, typename... Args> inline constexpr bool is_constructible_v = is_constructible<T, Args...>::value;
-
-	template<typename T> struct is_default_constructible { static constexpr bool value = is_constructible_v<T>; };
-	template<typename T> inline constexpr bool is_default_constructible_v = is_default_constructible<T>::value;
-
-	template<typename T> struct is_copy_constructible { static constexpr bool value = is_constructible_v<T, const T&>; };
-	template<typename T> inline constexpr bool is_copy_constructible_v = is_copy_constructible<T>::value;
-
-	template<typename T> struct is_move_constructible { static constexpr bool value = is_constructible_v<T, T&&>; };
-	template<typename T> inline constexpr bool is_move_constructible_v = is_move_constructible<T>::value;
-
-	template<typename T> struct is_trivially_copyable { static constexpr bool value = __is_trivially_copyable(T); };
-	template<typename T> inline constexpr bool is_trivially_copyable_v = is_trivially_copyable<T>::value;
-
 	template<typename T> struct is_integral { static constexpr bool value = requires (T t, T* p, void (*f)(T)) { reinterpret_cast<T>(t); f(0); p + t; }; };
 	template<typename T> inline constexpr bool is_integral_v = is_integral<T>::value;
 	template<typename T> concept integral = is_integral_v<T>;
@@ -90,61 +72,13 @@ namespace BAN
 	template<typename T> struct is_arithmetic { static constexpr bool value = is_integral_v<T> || is_floating_point_v<T>; };
 	template<typename T> inline constexpr bool is_arithmetic_v = is_arithmetic<T>::value;
 
-	template<typename Base, typename Derived> struct is_base_of { static constexpr bool value = __is_base_of(Base, Derived); };
-	template<typename Base, typename Derived> inline constexpr bool is_base_of_v = is_base_of<Base, Derived>::value;
-
-	template<typename T> struct is_pod { static constexpr bool value = __is_pod(T); };
-	template<typename T> inline constexpr bool is_pod_v = is_pod<T>::value;
-
 	namespace detail
 	{
 		template<typename T, bool = is_arithmetic_v<T>> struct is_signed { static constexpr bool value = T(-1) < T(0); };
 		template<typename T> struct is_signed<T, false> : false_type {};
-
-		template<typename T, bool = is_arithmetic_v<T>> struct is_unsigned { static constexpr bool value = T(0) < T(-1); };
-		template<typename T> struct is_unsigned<T, false> : false_type {};
 	}
 	template<typename T> struct is_signed : detail::is_signed<T> {};
 	template<typename T> inline constexpr bool is_signed_v = is_signed<T>::value;
-	template<typename T> concept signed_integral = is_signed_v<T> && is_integral_v<T>;
-
-	template<typename T> struct is_unsigned : detail::is_unsigned<T> {};
-	template<typename T> inline constexpr bool is_unsigned_v = is_unsigned<T>::value;
-	template<typename T> concept unsigned_integral = is_unsigned_v<T> && is_integral_v<T>;
-
-#define __BAN_TRAITS_MAKE_UNSIGNED_CV(__type)																	\
-	template<> struct make_unsigned<__type>					{ using type = unsigned __type; };					\
-	template<> struct make_unsigned<const __type>			{ using type = unsigned const __type; };			\
-	template<> struct make_unsigned<volatile __type>		{ using type = unsigned volatile __type; };			\
-	template<> struct make_unsigned<const volatile __type>	{ using type = unsigned const volatile __type; };
-
-	template<typename T> requires is_arithmetic_v<T> struct make_unsigned { using type = T; };
-	__BAN_TRAITS_MAKE_UNSIGNED_CV(char)
-	__BAN_TRAITS_MAKE_UNSIGNED_CV(short)
-	__BAN_TRAITS_MAKE_UNSIGNED_CV(int)
-	__BAN_TRAITS_MAKE_UNSIGNED_CV(long)
-	__BAN_TRAITS_MAKE_UNSIGNED_CV(long long)
-	template<typename T> using make_unsigned_t = typename make_unsigned<T>::type;
-#undef __BAN_TRAITS_MAKE_UNSIGNED_CV
-
-#define __BAN_TRAITS_MAKE_SIGNED_CV(__type)																		\
-	template<> struct make_signed<unsigned __type>					{ using type = __type; };					\
-	template<> struct make_signed<unsigned const __type>			{ using type = const __type; };				\
-	template<> struct make_signed<unsigned volatile __type>			{ using type = volatile __type; };			\
-	template<> struct make_signed<unsigned const volatile __type>	{ using type = const volatile __type; };
-
-	template<typename T> requires is_arithmetic_v<T> struct make_signed { using type = T; };
-	__BAN_TRAITS_MAKE_SIGNED_CV(char)
-	__BAN_TRAITS_MAKE_SIGNED_CV(short)
-	__BAN_TRAITS_MAKE_SIGNED_CV(int)
-	__BAN_TRAITS_MAKE_SIGNED_CV(long)
-	__BAN_TRAITS_MAKE_SIGNED_CV(long long)
-	template<typename T> using make_signed_t = typename make_signed<T>::type;
-#undef __BAN_TRAITS_MAKE_SIGNED_CV
-
-	template<typename T> struct it_value_type { using value_type = T::value_type; };
-	template<typename T> struct it_value_type<T*> { using value_type = T; };
-	template<typename T> using it_value_type_t = typename it_value_type<T>::value_type;
 
 	template<typename T> struct less	{ constexpr bool operator()(const T& lhs, const T& rhs) const { return lhs < rhs; } };
 	template<typename T> struct equal	{ constexpr bool operator()(const T& lhs, const T& rhs) const { return lhs == rhs; } };

BAN/include/BAN/UTF8.h

@@ -18,24 +18,23 @@ namespace BAN::UTF8
 			return 3;
 		if ((first_byte & 0xF8) == 0xF0)
 			return 4;
-		return UTF8::invalid;
+		return 0;
 	}
 
-	template<typename T> requires (sizeof(T) == 1)
+	constexpr uint32_t to_codepoint(uint8_t* bytes)
-	constexpr uint32_t to_codepoint(const T* bytes)
 	{
 		uint32_t length = byte_length(bytes[0]);
 
 		for (uint32_t i = 1; i < length; i++)
-			if (((uint8_t)bytes[i] & 0xC0) != 0x80)
+			if ((bytes[i] & 0xC0) != 0x80)
 				return UTF8::invalid;
 		
 		switch (length)
 		{
-			case 1: return (((uint8_t)bytes[0] & 0x80) != 0x00) ? UTF8::invalid :   (uint8_t)bytes[0];
+			case 1: return ((bytes[0] & 0x80) != 0x00) ? UTF8::invalid :   bytes[0];
-			case 2: return (((uint8_t)bytes[0] & 0xE0) != 0xC0) ? UTF8::invalid : (((uint8_t)bytes[0] & 0x1F) <<  6) |  ((uint8_t)bytes[1] & 0x3F);
+			case 2: return ((bytes[0] & 0xE0) != 0xC0) ? UTF8::invalid : ((bytes[0] & 0x1F) <<  6) |  (bytes[1] & 0x3F);
-			case 3: return (((uint8_t)bytes[0] & 0xF0) != 0xE0) ? UTF8::invalid : (((uint8_t)bytes[0] & 0x0F) << 12) | (((uint8_t)bytes[1] & 0x3F) <<  6) |  ((uint8_t)bytes[2] & 0x3F);
+			case 3: return ((bytes[0] & 0xF0) != 0xE0) ? UTF8::invalid : ((bytes[0] & 0x0F) << 12) | ((bytes[1] & 0x3F) <<  6) |  (bytes[2] & 0x3F);
-			case 4: return (((uint8_t)bytes[0] & 0xF8) != 0xF0) ? UTF8::invalid : (((uint8_t)bytes[0] & 0x07) << 18) | (((uint8_t)bytes[1] & 0x3F) << 12) | (((uint8_t)bytes[2] & 0x3F) << 6) | ((uint8_t)bytes[3] & 0x3F);
+			case 4: return ((bytes[0] & 0xF8) != 0xF0) ? UTF8::invalid : ((bytes[0] & 0x07) << 18) | ((bytes[1] & 0x3F) << 12) | ((bytes[2] & 0x3F) << 6) | (bytes[3] & 0x3F);
 		}
 
 		return UTF8::invalid;
@@ -76,8 +75,6 @@ namespace BAN::UTF8
 			}
 		}
 
-		*ptr = '\0';
-
 		return true;
 	}
 

BAN/include/BAN/UniqPtr.h

@@ -33,9 +33,8 @@ namespace BAN
 			return uniq;
 		}
 
-		// NOTE: don't use is_constructible_v<T, Args...> as UniqPtr<T> is allowed with friends
 		template<typename... Args>
-		static BAN::ErrorOr<UniqPtr> create(Args&&... args) requires requires(Args&&... args) { T(forward<Args>(args)...); }
+		static BAN::ErrorOr<UniqPtr> create(Args&&... args)
 		{
 			UniqPtr uniq;
 			uniq.m_pointer = new T(BAN::forward<Args>(args)...);

BAN/include/BAN/Variant.h

@@ -3,7 +3,6 @@
 #include <BAN/Assert.h>
 #include <BAN/Math.h>
 #include <BAN/Move.h>
-#include <BAN/PlacementNew.h>
 
 #include <string.h>
 
@@ -43,10 +42,9 @@ namespace BAN
 		void destruct(size_t index, uint8_t* data)
 		{
 			if (index == 0)
-			{
 				if constexpr(!is_lvalue_reference_v<T>)
 					reinterpret_cast<T*>(data)->~T();
-			}
+				else;
 			else if constexpr(sizeof...(Ts) > 0)
 				destruct<Ts...>(index - 1, data);
 			else
@@ -126,7 +124,6 @@ namespace BAN
 		Variant(Variant&& other)
 			: m_index(other.m_index)
 		{
-			if (other.has_value())
 			detail::move_construct<Ts...>(other.m_index, other.m_storage, m_storage);
 			other.clear();
 		}
@@ -134,7 +131,6 @@ namespace BAN
 		Variant(const Variant& other)
 			: m_index(other.m_index)
 		{
-			if (other.has_value())
 			detail::copy_construct<Ts...>(other.m_index, other.m_storage, m_storage);
 		}
 
@@ -159,12 +155,11 @@ namespace BAN
 
 		Variant& operator=(Variant&& other)
 		{
-			if (m_index == other.m_index && m_index != invalid_index())
+			if (m_index == other.m_index)
 				detail::move_assign<Ts...>(m_index, other.m_storage, m_storage);
 			else
 			{
 				clear();
-				if (other.has_value())
 				detail::move_construct<Ts...>(other.m_index, other.m_storage, m_storage);
 				m_index = other.m_index;
 			}
@@ -174,12 +169,11 @@ namespace BAN
 
 		Variant& operator=(const Variant& other)
 		{
-			if (m_index == other.m_index && m_index != invalid_index())
+			if (m_index == other.m_index)
 				detail::copy_assign<Ts...>(m_index, other.m_storage, m_storage);
 			else
 			{
 				clear();
-				if (other.has_value())
 				detail::copy_construct<Ts...>(other.m_index, other.m_storage, m_storage);
 				m_index = other.m_index;
 			}
@@ -220,14 +214,6 @@ namespace BAN
 			return m_index == detail::index<T, Ts...>();
 		}
 
-		template<typename T, typename... Args>
-		void emplace(Args&&... args) requires (can_have<T>() && is_constructible_v<T, Args...>)
-		{
-			clear();
-			m_index = detail::index<T, Ts...>();
-			new (m_storage) T(BAN::forward<Args>(args)...);
-		}
-
 		template<typename T>
 		void set(T&& value) requires (can_have<T>() && !is_lvalue_reference_v<T>)
 		{
@@ -290,16 +276,6 @@ namespace BAN
 			return **reinterpret_cast<const remove_reference_t<T>**>(m_storage);
 		}
 
-		bool has_value() const
-		{
-			return m_index != invalid_index();
-		}
-
-		explicit operator bool() const
-		{
-			return has_value();
-		}
-
 		void clear()
 		{
 			if (m_index != invalid_index())

BAN/include/BAN/Vector.h

@@ -5,9 +5,7 @@
 #include <BAN/Math.h>
 #include <BAN/Move.h>
 #include <BAN/New.h>
-#include <BAN/PlacementNew.h>
 #include <BAN/Span.h>
-#include <BAN/Swap.h>
 
 namespace BAN
 {
@@ -35,9 +33,9 @@ namespace BAN
 		ErrorOr<void> push_back(T&&);
 		ErrorOr<void> push_back(const T&);
 		template<typename... Args>
-		ErrorOr<void> emplace_back(Args&&...) requires is_constructible_v<T, Args...>;
+		ErrorOr<void> emplace_back(Args&&...);
 		template<typename... Args>
-		ErrorOr<void> emplace(size_type, Args&&...) requires is_constructible_v<T, Args...>;
+		ErrorOr<void> emplace(size_type, Args&&...);
 		ErrorOr<void> insert(size_type, T&&);
 		ErrorOr<void> insert(size_type, const T&);
 		
@@ -56,7 +54,7 @@ namespace BAN
 		bool contains(const T&) const;
 
 		Span<T> span() { return Span(m_data, m_size); }
-		Span<const T> span() const { return Span(m_data, m_size); }
+		const Span<T> span() const { return Span(m_data, m_size); }
 
 		const T& operator[](size_type) const;
 		T& operator[](size_type);
@@ -66,10 +64,7 @@ namespace BAN
 		const T& front() const;
 		T& front();
 
-		void reverse();
+		ErrorOr<void> resize(size_type, const T& = T());
-
-		ErrorOr<void> resize(size_type)				requires is_default_constructible_v<T>;
-		ErrorOr<void> resize(size_type, const T&)	requires is_copy_constructible_v<T>;
 		ErrorOr<void> reserve(size_type);
 		ErrorOr<void> shrink_to_fit();
 
@@ -141,13 +136,10 @@ namespace BAN
 	template<typename T>
 	Vector<T>& Vector<T>::operator=(const Vector<T>& other)
 	{
+		clear();
 		MUST(ensure_capacity(other.size()));
-		for (size_type i = 0; i < BAN::Math::min(size(), other.size()); i++)
+		for (size_type i = 0; i < other.size(); i++)
-			m_data[i] = other.m_data[i];
-		for (size_type i = size(); i < other.size(); i++)
 			new (m_data + i) T(other[i]);
-		for (size_type i = other.size(); i < size(); i++)
-			m_data[i].~T();
 		m_size = other.m_size;
 		return *this;
 	}
@@ -169,7 +161,7 @@ namespace BAN
 
 	template<typename T>
 	template<typename... Args>
-	ErrorOr<void> Vector<T>::emplace_back(Args&&... args) requires is_constructible_v<T, Args...>
+	ErrorOr<void> Vector<T>::emplace_back(Args&&... args)
 	{
 		TRY(ensure_capacity(m_size + 1));
 		new (m_data + m_size) T(forward<Args>(args)...);
@@ -179,7 +171,7 @@ namespace BAN
 
 	template<typename T>
 	template<typename... Args>
-	ErrorOr<void> Vector<T>::emplace(size_type index, Args&&... args) requires is_constructible_v<T, Args...>
+	ErrorOr<void> Vector<T>::emplace(size_type index, Args&&... args)
 	{
 		ASSERT(index <= m_size);
 		TRY(ensure_capacity(m_size + 1));
@@ -305,28 +297,7 @@ namespace BAN
 	}
 
 	template<typename T>
-	void Vector<T>::reverse()
+	ErrorOr<void> Vector<T>::resize(size_type size, const T& value)
-	{
-		for (size_type i = 0; i < m_size / 2; i++)
-			BAN::swap(m_data[i], m_data[m_size - i - 1]);
-	}
-
-	template<typename T>
-	ErrorOr<void> Vector<T>::resize(size_type size) requires is_default_constructible_v<T>
-	{
-		TRY(ensure_capacity(size));
-		if (size < m_size)
-			for (size_type i = size; i < m_size; i++)
-				m_data[i].~T();
-		if (size > m_size)
-			for (size_type i = m_size; i < size; i++)
-				new (m_data + i) T();
-		m_size = size;
-		return {};
-	}
-
-	template<typename T>
-	ErrorOr<void> Vector<T>::resize(size_type size, const T& value) requires is_copy_constructible_v<T>
 	{
 		TRY(ensure_capacity(size));
 		if (size < m_size)
@@ -381,35 +352,10 @@ namespace BAN
 	template<typename T>
 	ErrorOr<void> Vector<T>::ensure_capacity(size_type size)
 	{
-		static_assert(alignof(T) <= alignof(max_align_t), "over aligned types not supported");
-
 		if (m_capacity >= size)
 			return {};
-
+		size_type new_cap = BAN::Math::max<size_type>(size, m_capacity * 2);
-		const size_type new_cap = BAN::Math::max<size_type>(size, m_capacity * 2);
+		T* new_data = (T*)BAN::allocator(new_cap * sizeof(T));
-
-		if constexpr (BAN::is_trivially_copyable_v<T>)
-		{
-			if constexpr (BAN::reallocator)
-			{
-				auto* new_data = static_cast<T*>(BAN::reallocator(m_data, new_cap * sizeof(T)));
-				if (new_data == nullptr)
-					return Error::from_errno(ENOMEM);
-				m_data = new_data;
-			}
-			else
-			{
-				auto* new_data = static_cast<T*>(BAN::allocator(new_cap * sizeof(T)));
-				if (new_data == nullptr)
-					return Error::from_errno(ENOMEM);
-				memcpy(new_data, m_data, m_size * sizeof(T));
-				BAN::deallocator(m_data);
-				m_data = new_data;
-			}
-		}
-		else
-		{
-			auto* new_data = static_cast<T*>(BAN::allocator(new_cap * sizeof(T)));
 		if (new_data == nullptr)
 			return Error::from_errno(ENOMEM);
 		for (size_type i = 0; i < m_size; i++)
@@ -419,8 +365,6 @@ namespace BAN
 		}
 		BAN::deallocator(m_data);
 		m_data = new_data;
-		}
-
 		m_capacity = new_cap;
 		return {};
 	}

BAN/include/BAN/WeakPtr.h

@@ -2,10 +2,6 @@
 
 #include <BAN/RefPtr.h>
 
-#if __is_kernel
-#include <kernel/Lock/SpinLock.h>
-#endif
-
 namespace BAN
 {
 
@@ -15,37 +11,22 @@ namespace BAN
 	template<typename T>
 	class WeakPtr;
 
-	// FIXME: Write this without using locks...
 	template<typename T>
 	class WeakLink : public RefCounted<WeakLink<T>>
 	{
 	public:
-		RefPtr<T> try_lock() const
+		RefPtr<T> lock() { ASSERT(m_ptr); return raw_ptr(); }
-		{
+		T* raw_ptr() { return m_ptr; }
-#if __is_kernel
+
-			Kernel::SpinLockGuard _(m_weak_lock);
-#endif
-			if (m_ptr && m_ptr->try_ref())
-				return RefPtr<T>::adopt(m_ptr);
-			return nullptr;
-		}
 		bool valid() const { return m_ptr; }
-		void invalidate()
+		void invalidate() { m_ptr = nullptr; }
-		{
-#if __is_kernel
-			Kernel::SpinLockGuard _(m_weak_lock);
-#endif
-			m_ptr = nullptr;
-		}
 
 	private:
 		WeakLink(T* ptr) : m_ptr(ptr) {}
 
 	private:
 		T* m_ptr;
-#if __is_kernel
+
-		mutable Kernel::SpinLock m_weak_lock;
-#endif
 		friend class RefPtr<WeakLink<T>>;
 	};
 
@@ -53,7 +34,7 @@ namespace BAN
 	class Weakable
 	{
 	public:
-		virtual ~Weakable()
+		~Weakable()
 		{
 			if (m_link)
 				m_link->invalidate();
@@ -99,10 +80,10 @@ namespace BAN
 			return *this;
 		}
 
-		RefPtr<T> lock() const
+		RefPtr<T> lock()
 		{
-			if (m_link)
+			if (m_link->valid())
-				return m_link->try_lock();
+				return m_link->lock();
 			return nullptr;
 		}
 
@@ -110,8 +91,6 @@ namespace BAN
 
 		bool valid() const { return m_link && m_link->valid(); }
 
-		explicit operator bool() const { return valid(); }
-
 	private:
 		WeakPtr(const RefPtr<WeakLink<T>>& link)
 			: m_link(link)

CMakeLists.txt

@@ -1,54 +1,118 @@
 cmake_minimum_required(VERSION 3.26)
 
-if (NOT ${CMAKE_SYSTEM_NAME} STREQUAL "banan-os")
+if(DEFINED ENV{BANAN_ARCH})
-	message(FATAL_ERROR "CMAKE_SYSTEM_NAME is not banan-os")
+	set(BANAN_ARCH $ENV{BANAN_ARCH})
-endif ()
+else()
+	set(BANAN_ARCH x86_64)
+endif()
 
-project(banan-os CXX C ASM)
+set(TOOLCHAIN_PREFIX ${CMAKE_SOURCE_DIR}/toolchain/local)
 
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}/bin/${BANAN_ARCH}-banan_os-g++)
+set(CMAKE_CXX_COMPILER_WORKS True)
+
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}/bin/${BANAN_ARCH}-banan_os-gcc)
+set(CMAKE_C_COMPILER_WORKS True)
+
+if(NOT EXISTS ${CMAKE_CXX_COMPILER})
+	set(CMAKE_CXX_COMPILER g++)
+endif()
+
+if(DEFINED QEMU_ACCEL)
+	set(QEMU_ACCEL -accel ${QEMU_ACCEL})
+endif()
+
+add_compile_options(-mno-sse -mno-sse2)
+add_compile_definitions(__enable_sse=0)
+
+project(banan-os CXX)
+
+set(BANAN_BASE_SYSROOT ${CMAKE_SOURCE_DIR}/base-sysroot.tar.gz)
+set(BANAN_SYSROOT ${CMAKE_BINARY_DIR}/sysroot)
 set(BANAN_INCLUDE ${BANAN_SYSROOT}/usr/include)
 set(BANAN_LIB ${BANAN_SYSROOT}/usr/lib)
 set(BANAN_BIN ${BANAN_SYSROOT}/usr/bin)
-set(BANAN_ETC     ${BANAN_SYSROOT}/usr/etc)
-set(BANAN_SHARE   ${BANAN_SYSROOT}/usr/share)
 set(BANAN_BOOT ${BANAN_SYSROOT}/boot)
-
+set(DISK_IMAGE_PATH ${CMAKE_BINARY_DIR}/banan-os.img)
-set(CMAKE_INSTALL_BINDIR     ${BANAN_BIN})
-set(CMAKE_INSTALL_SBINDIR    ${BANAN_BIN})
-set(CMAKE_INSTALL_LIBDIR     ${BANAN_LIB})
-set(CMAKE_INSTALL_INCLUDEDIR ${BANAN_INCLUDE})
-set(CMAKE_INSTALL_SYSCONF    ${BANAN_ETC})
-set(CMAKE_INSTALL_MESSAGE    NEVER)
-set(CMAKE_SKIP_INSTALL_ALL_DEPENDENCY True)
-
-set(CMAKE_STATIC_LIBRARY_PREFIX "")
-set(CMAKE_SHARED_LIBRARY_PREFIX "")
-set(BUILD_SHARED_LIBS True)
-
-set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-
-# include headers of ${library} to ${target}
-function(banan_include_headers target library)
-	target_include_directories(${target} PUBLIC $<TARGET_PROPERTY:${library},SOURCE_DIR>/include)
-endfunction()
-
-# include headers and link ${library} to ${target}
-function(banan_link_library target library)
-	target_link_libraries(${target} PUBLIC ${library})
-	banan_include_headers(${target} ${library})
-endfunction()
-
-# add install step for all header files of target
-function(banan_install_headers target)
-	file(GLOB_RECURSE headers RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include *.h)
-	foreach(header ${headers})
-		get_filename_component(subdirectory ${header} DIRECTORY)
-		install(FILES include/${header} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${subdirectory})
-	endforeach()
-	target_include_directories(${target} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include)
-endfunction()
 
 add_subdirectory(kernel)
-add_subdirectory(bootloader)
 add_subdirectory(BAN)
+add_subdirectory(libc)
+add_subdirectory(LibELF)
 add_subdirectory(userspace)
+
+add_custom_target(sysroot
+	COMMAND mkdir -p ${BANAN_SYSROOT}
+	COMMAND cd ${BANAN_SYSROOT} && sudo tar xf ${BANAN_BASE_SYSROOT}
+	USES_TERMINAL
+)
+
+add_custom_target(headers
+	DEPENDS kernel-headers
+	DEPENDS ban-headers
+	DEPENDS libc-headers
+	DEPENDS libelf-headers
+)
+
+add_custom_target(toolchain
+	COMMAND ${CMAKE_COMMAND} -E env SYSROOT="${BANAN_SYSROOT}" PREFIX="${TOOLCHAIN_PREFIX}" ARCH="${BANAN_ARCH}" ${CMAKE_SOURCE_DIR}/toolchain/build.sh
+	DEPENDS headers
+	USES_TERMINAL
+)
+
+add_custom_target(libstdc++
+	COMMAND ${CMAKE_COMMAND} -E env LIBSTDCPP="1" ${CMAKE_SOURCE_DIR}/toolchain/build.sh
+	DEPENDS libc-install
+	USES_TERMINAL
+)
+
+add_custom_target(image
+	COMMAND ${CMAKE_COMMAND} -E env SYSROOT="${BANAN_SYSROOT}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" ${CMAKE_SOURCE_DIR}/image.sh
+	DEPENDS kernel-install
+	DEPENDS ban-install
+	DEPENDS libc-install
+	DEPENDS userspace-install
+	DEPENDS libelf-install
+	USES_TERMINAL
+)
+
+add_custom_target(image-full
+	COMMAND ${CMAKE_COMMAND} -E env SYSROOT="${BANAN_SYSROOT}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" ${CMAKE_SOURCE_DIR}/image-full.sh
+	DEPENDS kernel-install
+	DEPENDS ban-install
+	DEPENDS libc-install
+	DEPENDS userspace-install
+	DEPENDS libelf-install
+	USES_TERMINAL
+)
+
+add_custom_target(check-fs
+	COMMAND ${CMAKE_COMMAND} -E env DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" ${CMAKE_SOURCE_DIR}/check-fs.sh
+	USES_TERMINAL
+)
+
+add_custom_target(qemu
+	COMMAND ${CMAKE_COMMAND} -E env BANAN_ARCH="${BANAN_ARCH}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" ${CMAKE_SOURCE_DIR}/qemu.sh -serial stdio ${QEMU_ACCEL}
+	DEPENDS image
+	USES_TERMINAL
+)
+
+add_custom_target(qemu-nographic
+	COMMAND ${CMAKE_COMMAND} -E env BANAN_ARCH="${BANAN_ARCH}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" ${CMAKE_SOURCE_DIR}/qemu.sh -nographic ${QEMU_ACCEL}
+	DEPENDS image
+	USES_TERMINAL
+)
+
+add_custom_target(qemu-debug
+	COMMAND ${CMAKE_COMMAND} -E env BANAN_ARCH="${BANAN_ARCH}" DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" ${CMAKE_SOURCE_DIR}/qemu.sh -serial stdio -d int -no-reboot
+	DEPENDS image
+	USES_TERMINAL
+)
+
+add_custom_target(bochs
+	COMMAND ${CMAKE_COMMAND} -E env DISK_IMAGE_PATH="${DISK_IMAGE_PATH}" ${CMAKE_SOURCE_DIR}/bochs.sh
+	DEPENDS image
+	USES_TERMINAL
+)

LibELF/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(LibELF CXX)
+
+add_custom_target(libelf-headers
+	COMMAND sudo rsync -a ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
+	DEPENDS sysroot
+	USES_TERMINAL
+)
+
+add_custom_target(libelf-install
+	DEPENDS libelf-headers
+)

LibELF/LibELF/ELF.cpp

@@ -0,0 +1,406 @@
+#include <BAN/ScopeGuard.h>
+#include <LibELF/ELF.h>
+#include <LibELF/Values.h>
+
+#ifdef __is_kernel
+#include <kernel/FS/VirtualFileSystem.h>
+#include <kernel/Memory/PageTableScope.h>
+#include <kernel/Process.h>
+#endif
+
+#include <fcntl.h>
+
+#define ELF_PRINT_HEADERS 0
+
+#ifdef __is_kernel
+extern uint8_t g_kernel_end[];
+using namespace Kernel;
+#endif
+
+namespace LibELF
+{
+
+#ifdef __is_kernel
+	BAN::ErrorOr<BAN::UniqPtr<ELF>> ELF::load_from_file(BAN::RefPtr<Inode> inode)
+	{
+		BAN::Vector<uint8_t> buffer;
+		TRY(buffer.resize(inode->size()));
+
+		TRY(inode->read(0, buffer.data(), inode->size()));
+
+		ELF* elf_ptr = new ELF(BAN::move(buffer));
+		if (elf_ptr == nullptr)
+			return BAN::Error::from_errno(ENOMEM);
+
+		auto elf = BAN::UniqPtr<ELF>::adopt(elf_ptr);
+		TRY(elf->load());
+
+		return BAN::move(elf);
+	}
+#else
+	BAN::ErrorOr<ELF*> ELF::load_from_file(BAN::StringView file_path)
+	{
+		ELF* elf = nullptr;
+
+		{
+			BAN::Vector<uint8_t> data;
+
+			int fd = TRY(Kernel::Process::current().open(file_path, O_RDONLY));
+			BAN::ScopeGuard _([fd] { MUST(Kernel::Process::current().close(fd)); });
+
+			struct stat st;
+			TRY(Kernel::Process::current().fstat(fd, &st));
+
+			TRY(data.resize(st.st_size));
+
+			TRY(Kernel::Process::current().read(fd, data.data(), data.size()));
+
+			elf = new ELF(BAN::move(data));
+			ASSERT(elf);
+		}
+
+		if (auto res = elf->load(); res.is_error())
+		{
+			delete elf;
+			return res.error();
+		}
+
+		return elf;
+	}
+#endif
+
+	BAN::ErrorOr<void> ELF::load()
+	{
+		if (m_data.size() < EI_NIDENT)
+		{
+			dprintln("Too small ELF file");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		if (m_data[EI_MAG0] != ELFMAG0 || 
+			m_data[EI_MAG1] != ELFMAG1 ||
+			m_data[EI_MAG2] != ELFMAG2 ||
+			m_data[EI_MAG3] != ELFMAG3)
+		{
+			dprintln("Invalid ELF header");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		if (m_data[EI_DATA] != ELFDATA2LSB)
+		{
+			dprintln("Only little-endian is supported");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		if (m_data[EI_VERSION] != EV_CURRENT)
+		{
+			dprintln("Invalid ELF version");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		if (m_data[EI_CLASS] == ELFCLASS64)
+		{
+			if (m_data.size() <= sizeof(Elf64FileHeader))
+			{
+				dprintln("Too small ELF file");
+				return BAN::Error::from_errno(EINVAL);
+			}
+
+			auto& header = file_header64();
+			if (!parse_elf64_file_header(header))
+				return BAN::Error::from_errno(EINVAL);
+
+			for (size_t i = 0; i < header.e_phnum; i++)
+			{
+				auto& program_header = program_header64(i);
+				if (!parse_elf64_program_header(program_header))
+					return BAN::Error::from_errno(EINVAL);
+			}
+
+			for (size_t i = 1; i < header.e_shnum; i++)
+			{
+				auto& section_header = section_header64(i);
+				if (!parse_elf64_section_header(section_header))
+					return BAN::Error::from_errno(EINVAL);
+			}
+		}
+		else if (m_data[EI_CLASS] == ELFCLASS32)
+		{
+			if (m_data.size() <= sizeof(Elf32FileHeader))
+			{
+				dprintln("Too small ELF file");
+				return BAN::Error::from_errno(EINVAL);
+			}
+
+			auto& header = file_header32();
+			if (!parse_elf32_file_header(header))
+				return BAN::Error::from_errno(EINVAL);
+
+			for (size_t i = 0; i < header.e_phnum; i++)
+			{
+				auto& program_header = program_header32(i);
+				if (!parse_elf32_program_header(program_header))
+					return BAN::Error::from_errno(EINVAL);
+			}
+
+			for (size_t i = 1; i < header.e_shnum; i++)
+			{
+				auto& section_header = section_header32(i);
+				if (!parse_elf32_section_header(section_header))
+					return BAN::Error::from_errno(EINVAL);
+			}
+		}
+
+		return {};
+	}
+
+	bool ELF::is_x86_32() const { return m_data[EI_CLASS] == ELFCLASS32; }
+	bool ELF::is_x86_64() const { return m_data[EI_CLASS] == ELFCLASS64; }
+
+	/*
+
+		64 bit ELF
+
+	*/
+
+	const char* ELF::lookup_section_name64(uint32_t offset) const
+	{
+		return lookup_string64(file_header64().e_shstrndx, offset);
+	}
+
+	const char* ELF::lookup_string64(size_t table_index, uint32_t offset) const
+	{
+		if (table_index == SHN_UNDEF)
+			return nullptr;
+		auto& section_header = section_header64(table_index);
+		return (const char*)m_data.data() + section_header.sh_offset + offset;
+	}
+
+	bool ELF::parse_elf64_file_header(const Elf64FileHeader& header)
+	{
+		if (header.e_type != ET_EXEC)
+		{
+			dprintln("Only executable files are supported");
+			return false;
+		}
+
+		if (header.e_version != EV_CURRENT)
+		{
+			dprintln("Invalid ELF version");
+			return false;
+		}
+
+		return true;
+	}
+
+	bool ELF::parse_elf64_program_header(const Elf64ProgramHeader& header)
+	{
+#if ELF_PRINT_HEADERS
+		dprintln("program header");
+		dprintln("  type   {H}", header.p_type);
+		dprintln("  flags  {H}", header.p_flags);
+		dprintln("  offset {H}", header.p_offset);
+		dprintln("  vaddr  {H}", header.p_vaddr);
+		dprintln("  paddr  {H}", header.p_paddr);
+		dprintln("  filesz {}", header.p_filesz);
+		dprintln("  memsz  {}", header.p_memsz);
+		dprintln("  align  {}", header.p_align);
+#endif
+		(void)header;
+		return true;
+	}
+
+	bool ELF::parse_elf64_section_header(const Elf64SectionHeader& header)
+	{
+#if ELF_PRINT_HEADERS
+		if (auto* name = lookup_section_name64(header.sh_name))
+			dprintln("{}", name);
+
+		switch (header.sh_type)
+		{
+			case SHT_NULL:
+				dprintln("  SHT_NULL");
+				break;
+			case SHT_PROGBITS:
+				dprintln("  SHT_PROGBITS");
+				break;
+			case SHT_SYMTAB:
+				for (size_t i = 1; i < header.sh_size / header.sh_entsize; i++)
+				{
+					auto& symbol = ((const Elf64Symbol*)(m_data.data() + header.sh_offset))[i];
+					if (auto* name = lookup_string64(header.sh_link, symbol.st_name))
+						dprintln("  {}", name);
+				}
+				break;
+			case SHT_STRTAB:
+				dprintln("  SHT_STRTAB");
+				break;
+			case SHT_RELA:
+				dprintln("  SHT_RELA");
+				break;
+			case SHT_NOBITS:
+				dprintln("  SHT_NOBITS");
+				break;
+			case SHT_REL:
+				dprintln("  SHT_REL");
+				break;
+			case SHT_SHLIB:
+				dprintln("  SHT_SHLIB");
+				break;
+			case SHT_DYNSYM:
+				dprintln("  SHT_DYNSYM");
+				break;
+			default:
+				ASSERT(false);
+		}	
+#endif
+		(void)header;
+		return true;
+	}
+
+	const Elf64FileHeader& ELF::file_header64() const
+	{
+		ASSERT(is_x86_64());
+		return *(const Elf64FileHeader*)m_data.data();
+	}
+
+	const Elf64ProgramHeader& ELF::program_header64(size_t index) const
+	{
+		ASSERT(is_x86_64());
+		const auto& file_header = file_header64();
+		ASSERT(index < file_header.e_phnum);
+		return *(const Elf64ProgramHeader*)(m_data.data() + file_header.e_phoff + file_header.e_phentsize * index);
+	}
+
+	const Elf64SectionHeader& ELF::section_header64(size_t index) const
+	{
+		ASSERT(is_x86_64());
+		const auto& file_header = file_header64();
+		ASSERT(index < file_header.e_shnum);
+		return *(const Elf64SectionHeader*)(m_data.data() + file_header.e_shoff + file_header.e_shentsize * index);
+	}
+
+	/*
+
+		32 bit ELF
+
+	*/
+
+	const char* ELF::lookup_section_name32(uint32_t offset) const
+	{
+		return lookup_string32(file_header32().e_shstrndx, offset);
+	}
+
+	const char* ELF::lookup_string32(size_t table_index, uint32_t offset) const
+	{
+		if (table_index == SHN_UNDEF)
+			return nullptr;
+		auto& section_header = section_header32(table_index);
+		return (const char*)m_data.data() + section_header.sh_offset + offset;
+	}
+
+	bool ELF::parse_elf32_file_header(const Elf32FileHeader& header)
+	{
+		if (header.e_type != ET_EXEC)
+		{
+			dprintln("Only executable files are supported");
+			return false;
+		}
+
+		if (header.e_version != EV_CURRENT)
+		{
+			dprintln("Invalid ELF version");
+			return false;
+		}
+
+		return true;
+	}
+
+	bool ELF::parse_elf32_program_header(const Elf32ProgramHeader& header)
+	{
+#if ELF_PRINT_HEADERS
+		dprintln("program header");
+		dprintln("  type   {H}", header.p_type);
+		dprintln("  flags  {H}", header.p_flags);
+		dprintln("  offset {H}", header.p_offset);
+		dprintln("  vaddr  {H}", header.p_vaddr);
+		dprintln("  paddr  {H}", header.p_paddr);
+		dprintln("  filesz {}", header.p_filesz);
+		dprintln("  memsz  {}", header.p_memsz);
+		dprintln("  align  {}", header.p_align);
+#endif
+		(void)header;
+		return true;
+	}
+
+	bool ELF::parse_elf32_section_header(const Elf32SectionHeader& header)
+	{
+#if ELF_PRINT_HEADERS
+		if (auto* name = lookup_section_name32(header.sh_name))
+			dprintln("{}", name);
+
+		switch (header.sh_type)
+		{
+			case SHT_NULL:
+				dprintln("  SHT_NULL");
+				break;
+			case SHT_PROGBITS:
+				dprintln("  SHT_PROGBITS");
+				break;
+			case SHT_SYMTAB:
+				for (size_t i = 1; i < header.sh_size / header.sh_entsize; i++)
+				{
+					auto& symbol = ((const Elf32Symbol*)(m_data.data() + header.sh_offset))[i];
+					if (auto* name = lookup_string32(header.sh_link, symbol.st_name))
+						dprintln("  {}", name);
+				}
+				break;
+			case SHT_STRTAB:
+				dprintln("  SHT_STRTAB");
+				break;
+			case SHT_RELA:
+				dprintln("  SHT_RELA");
+				break;
+			case SHT_NOBITS:
+				dprintln("  SHT_NOBITS");
+				break;
+			case SHT_REL:
+				dprintln("  SHT_REL");
+				break;
+			case SHT_SHLIB:
+				dprintln("  SHT_SHLIB");
+				break;
+			case SHT_DYNSYM:
+				dprintln("  SHT_DYNSYM");
+				break;
+			default:
+				ASSERT(false);
+		}	
+#endif
+		(void)header;
+		return true;
+	}
+
+	const Elf32FileHeader& ELF::file_header32() const
+	{
+		ASSERT(is_x86_32());
+		return *(const Elf32FileHeader*)m_data.data();
+	}
+
+	const Elf32ProgramHeader& ELF::program_header32(size_t index) const
+	{
+		ASSERT(is_x86_32());
+		const auto& file_header = file_header32();
+		ASSERT(index < file_header.e_phnum);
+		return *(const Elf32ProgramHeader*)(m_data.data() + file_header.e_phoff + file_header.e_phentsize * index);
+	}
+
+	const Elf32SectionHeader& ELF::section_header32(size_t index) const
+	{
+		ASSERT(is_x86_32());
+		const auto& file_header = file_header32();
+		ASSERT(index < file_header.e_shnum);
+		return *(const Elf32SectionHeader*)(m_data.data() + file_header.e_shoff + file_header.e_shentsize * index);
+	}
+
+}

LibELF/LibELF/LoadableELF.cpp

@@ -0,0 +1,297 @@
+#include <BAN/ScopeGuard.h>
+#include <kernel/Memory/Heap.h>
+#include <kernel/LockGuard.h>
+#include <LibELF/LoadableELF.h>
+#include <LibELF/Values.h>
+
+namespace LibELF
+{
+
+	using namespace Kernel;
+
+	BAN::ErrorOr<BAN::UniqPtr<LoadableELF>> LoadableELF::load_from_inode(PageTable& page_table, BAN::RefPtr<Inode> inode)
+	{
+		auto* elf_ptr = new LoadableELF(page_table, inode);
+		if (elf_ptr == nullptr)
+			return BAN::Error::from_errno(ENOMEM);
+		auto elf = BAN::UniqPtr<LoadableELF>::adopt(elf_ptr);
+		TRY(elf->initialize());
+		return BAN::move(elf);
+	}
+
+	LoadableELF::LoadableELF(PageTable& page_table, BAN::RefPtr<Inode> inode)
+		: m_inode(inode)
+		, m_page_table(page_table)
+	{
+	}
+
+	LoadableELF::~LoadableELF()
+	{
+		for (const auto& program_header : m_program_headers)
+		{
+			switch (program_header.p_type)
+			{
+				case PT_NULL:
+					continue;
+				case PT_LOAD:
+				{
+					vaddr_t start = program_header.p_vaddr & PAGE_ADDR_MASK;
+					size_t pages = range_page_count(program_header.p_vaddr, program_header.p_memsz);
+					for (size_t i = 0; i < pages; i++)
+					{
+						paddr_t paddr = m_page_table.physical_address_of(start + i * PAGE_SIZE);
+						if (paddr != 0)
+							Heap::get().release_page(paddr);
+					}
+					m_page_table.unmap_range(start, pages * PAGE_SIZE);
+					break;
+				}
+				default:
+					ASSERT_NOT_REACHED();
+			}
+		}
+	}
+
+	BAN::ErrorOr<void> LoadableELF::initialize()
+	{
+		if ((size_t)m_inode->size() < sizeof(ElfNativeFileHeader))
+		{
+			dprintln("Too small file");
+			return BAN::Error::from_errno(ENOEXEC);
+		}
+
+		size_t nread = TRY(m_inode->read(0, &m_file_header, sizeof(m_file_header)));
+		ASSERT(nread == sizeof(m_file_header));
+
+		if (m_file_header.e_ident[EI_MAG0] != ELFMAG0 || 
+			m_file_header.e_ident[EI_MAG1] != ELFMAG1 ||
+			m_file_header.e_ident[EI_MAG2] != ELFMAG2 ||
+			m_file_header.e_ident[EI_MAG3] != ELFMAG3)
+		{
+			dprintln("Invalid magic in header");
+			return BAN::Error::from_errno(ENOEXEC);
+		}
+
+		if (m_file_header.e_ident[EI_DATA] != ELFDATA2LSB)
+		{
+			dprintln("Only little-endian is supported");
+			return BAN::Error::from_errno(ENOEXEC);
+		}
+
+		if (m_file_header.e_ident[EI_VERSION] != EV_CURRENT)
+		{
+			dprintln("Invalid version");
+			return BAN::Error::from_errno(ENOEXEC);
+		}
+
+#if ARCH(i386)
+		if (m_file_header.e_ident[EI_CLASS] != ELFCLASS32)
+#elif ARCH(x86_64)
+		if (m_file_header.e_ident[EI_CLASS] != ELFCLASS64)
+#endif
+		{
+			dprintln("Not in native format");	
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		if (m_file_header.e_type != ET_EXEC)
+		{
+			dprintln("Only executable files are supported");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		if (m_file_header.e_version != EV_CURRENT)
+		{
+			dprintln("Unsupported version");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		ASSERT(m_file_header.e_phentsize <= sizeof(ElfNativeProgramHeader));
+
+		TRY(m_program_headers.resize(m_file_header.e_phnum));
+		for (size_t i = 0; i < m_file_header.e_phnum; i++)
+		{
+			TRY(m_inode->read(m_file_header.e_phoff + m_file_header.e_phentsize * i, &m_program_headers[i], m_file_header.e_phentsize));
+
+			const auto& pheader = m_program_headers[i];
+			if (pheader.p_type != PT_NULL && pheader.p_type != PT_LOAD)
+			{
+				dprintln("Unsupported program header type {}", pheader.p_type);
+				return BAN::Error::from_errno(ENOTSUP);
+			}
+			if (pheader.p_memsz < pheader.p_filesz)
+			{
+				dprintln("Invalid program header");
+				return BAN::Error::from_errno(EINVAL);
+			}
+
+			m_virtual_page_count += BAN::Math::div_round_up<size_t>((pheader.p_vaddr % PAGE_SIZE) + pheader.p_memsz, PAGE_SIZE);
+		}
+
+		return {};
+	}
+
+	vaddr_t LoadableELF::entry_point() const
+	{
+		return m_file_header.e_entry;
+	}
+
+	bool LoadableELF::contains(vaddr_t address) const
+	{
+		for (const auto& program_header : m_program_headers)
+		{
+			switch (program_header.p_type)
+			{
+				case PT_NULL:
+					continue;
+				case PT_LOAD:
+					if (program_header.p_vaddr <= address && address < program_header.p_vaddr + program_header.p_memsz)
+						return true;
+					break;
+				default:
+					ASSERT_NOT_REACHED();
+			}
+		}
+		return false;
+	}
+
+	void LoadableELF::reserve_address_space()
+	{
+		for (const auto& program_header : m_program_headers)
+		{
+			switch (program_header.p_type)
+			{
+				case PT_NULL:
+					break;
+				case PT_LOAD:
+				{
+					vaddr_t page_vaddr = program_header.p_vaddr & PAGE_ADDR_MASK;
+					size_t pages = range_page_count(program_header.p_vaddr, program_header.p_memsz);
+					ASSERT(m_page_table.reserve_range(page_vaddr, pages * PAGE_SIZE));
+					break;
+				}
+				default:
+					ASSERT_NOT_REACHED();
+			}
+		}
+	}
+
+	BAN::ErrorOr<void> LoadableELF::load_page_to_memory(vaddr_t address)
+	{
+		for (const auto& program_header : m_program_headers)
+		{
+			switch (program_header.p_type)
+			{
+				case PT_NULL:
+					break;
+				case PT_LOAD:
+				{
+					if (!(program_header.p_vaddr <= address && address < program_header.p_vaddr + program_header.p_memsz))
+						continue;
+
+					PageTable::flags_t flags = PageTable::Flags::UserSupervisor | PageTable::Flags::Present;
+					if (program_header.p_flags & LibELF::PF_W)
+						flags |= PageTable::Flags::ReadWrite;
+					if (program_header.p_flags & LibELF::PF_X)
+						flags |= PageTable::Flags::Execute;
+
+					vaddr_t vaddr = address & PAGE_ADDR_MASK;
+					paddr_t paddr = Heap::get().take_free_page();
+					if (paddr == 0)
+						return BAN::Error::from_errno(ENOMEM);
+
+					m_page_table.map_page_at(paddr, vaddr, flags);
+					m_physical_page_count++;
+
+					memset((void*)vaddr, 0x00, PAGE_SIZE);
+					
+					if (vaddr / PAGE_SIZE < BAN::Math::div_round_up<size_t>(program_header.p_vaddr + program_header.p_filesz, PAGE_SIZE))
+					{
+						size_t vaddr_offset = 0;
+						if (vaddr < program_header.p_vaddr)
+							vaddr_offset = program_header.p_vaddr - vaddr;
+						
+						size_t file_offset = 0;
+						if (vaddr > program_header.p_vaddr)
+							file_offset = vaddr - program_header.p_vaddr;
+
+						size_t bytes = BAN::Math::min<size_t>(PAGE_SIZE - vaddr_offset, program_header.p_filesz - file_offset);
+						TRY(m_inode->read(program_header.p_offset + file_offset, (void*)(vaddr + vaddr_offset), bytes));
+					}
+
+					return {};
+				}
+				default:
+					ASSERT_NOT_REACHED();
+			}
+		}
+		ASSERT_NOT_REACHED();
+	}
+
+	
+	BAN::ErrorOr<BAN::UniqPtr<LoadableELF>> LoadableELF::clone(Kernel::PageTable& new_page_table)
+	{
+		auto* elf_ptr = new LoadableELF(new_page_table, m_inode);
+		if (elf_ptr == nullptr)
+			return BAN::Error::from_errno(ENOMEM);
+		auto elf = BAN::UniqPtr<LoadableELF>::adopt(elf_ptr);
+
+		memcpy(&elf->m_file_header, &m_file_header, sizeof(ElfNativeFileHeader));
+
+		TRY(elf->m_program_headers.resize(m_program_headers.size()));
+		memcpy(elf->m_program_headers.data(), m_program_headers.data(), m_program_headers.size() * sizeof(ElfNativeProgramHeader));
+
+		elf->reserve_address_space();
+
+		ASSERT(&PageTable::current() == &m_page_table);
+		LockGuard _(m_page_table);
+		ASSERT(m_page_table.is_page_free(0));
+
+		for (const auto& program_header : m_program_headers)
+		{
+			switch (program_header.p_type)
+			{
+				case PT_NULL:
+					break;
+				case PT_LOAD:
+				{
+					if (!(program_header.p_flags & LibELF::PF_W))
+						continue;
+
+					PageTable::flags_t flags = PageTable::Flags::UserSupervisor | PageTable::Flags::Present;
+					if (program_header.p_flags & LibELF::PF_W)
+						flags |= PageTable::Flags::ReadWrite;
+					if (program_header.p_flags & LibELF::PF_X)
+						flags |= PageTable::Flags::Execute;
+
+					vaddr_t start = program_header.p_vaddr & PAGE_ADDR_MASK;
+					size_t pages = range_page_count(program_header.p_vaddr, program_header.p_memsz);
+
+					for (size_t i = 0; i < pages; i++)
+					{
+						if (m_page_table.physical_address_of(start + i * PAGE_SIZE) == 0)
+							continue;
+
+						paddr_t paddr = Heap::get().take_free_page();
+						if (paddr == 0)
+							return BAN::Error::from_errno(ENOMEM);
+
+						m_page_table.map_page_at(paddr, 0, PageTable::Flags::ReadWrite | PageTable::Flags::Present);
+						memcpy((void*)0, (void*)(start + i * PAGE_SIZE), PAGE_SIZE);
+						m_page_table.unmap_page(0);
+
+						new_page_table.map_page_at(paddr, start + i * PAGE_SIZE, flags);
+						elf->m_physical_page_count++;
+					}
+
+					break;
+				}
+				default:
+					ASSERT_NOT_REACHED();
+			}
+		}
+
+		return elf;
+	}
+
+}

LibELF/include/LibELF/ELF.h

@@ -0,0 +1,89 @@
+#pragma once
+
+#ifdef __is_kernel
+#include <kernel/FS/Inode.h>
+#include <kernel/Memory/VirtualRange.h>
+#endif
+
+#include <BAN/StringView.h>
+#include <BAN/UniqPtr.h>
+#include <BAN/Vector.h>
+#include <kernel/Arch.h>
+#include "Types.h"
+
+namespace LibELF
+{
+
+	class ELF
+	{
+	public:
+#ifdef __is_kernel
+		static BAN::ErrorOr<BAN::UniqPtr<ELF>> load_from_file(BAN::RefPtr<Kernel::Inode>);
+#else
+		static BAN::ErrorOr<BAN::UniqPtr<ELF>> load_from_file(BAN::StringView);
+#endif
+
+		const Elf64FileHeader& file_header64() const;
+		const Elf64ProgramHeader& program_header64(size_t) const;
+		const Elf64SectionHeader& section_header64(size_t) const;
+		const char* lookup_section_name64(uint32_t) const;
+		const char* lookup_string64(size_t, uint32_t) const;
+#if ARCH(x86_64)
+		const Elf64FileHeader& file_header_native() const { return file_header64(); }
+		const Elf64ProgramHeader& program_header_native(size_t index) const { return program_header64(index); }
+		const Elf64SectionHeader& section_header_native(size_t index) const { return section_header64(index); }
+		const char* lookup_section_name_native(uint32_t offset) const { return lookup_section_name64(offset); }
+		const char* lookup_string_native(size_t table_index, uint32_t offset) const { return lookup_string64(table_index, offset); }
+		bool is_native() const { return is_x86_64(); }
+#endif
+
+		const Elf32FileHeader& file_header32() const;
+		const Elf32ProgramHeader& program_header32(size_t) const;
+		const Elf32SectionHeader& section_header32(size_t) const;
+		const char* lookup_section_name32(uint32_t) const;
+		const char* lookup_string32(size_t, uint32_t) const;
+#if ARCH(i386)
+		const Elf32FileHeader& file_header_native() const { return file_header32(); }
+		const Elf32ProgramHeader& program_header_native(size_t index) const { return program_header32(index); }
+		const Elf32SectionHeader& section_header_native(size_t index) const { return section_header32(index); }
+		const char* lookup_section_name_native(uint32_t offset) const { return lookup_section_name32(offset); }
+		const char* lookup_string_native(size_t table_index, uint32_t offset) const { return lookup_string32(table_index, offset); }
+		bool is_native() const { return is_x86_32(); }
+#endif
+
+		const uint8_t* data() const { return m_data.data(); }
+
+		bool is_x86_32() const;
+		bool is_x86_64() const;
+
+	private:
+//#ifdef __is_kernel
+//		ELF(BAN::UniqPtr<Kernel::VirtualRange>&& storage, size_t size)
+//			: m_storage(BAN::move(storage))
+//			, m_data((const uint8_t*)m_storage->vaddr(), size)
+//		{}
+//#else
+		ELF(BAN::Vector<uint8_t>&& data)
+			: m_data(BAN::move(data))
+		{}
+//#endif
+		BAN::ErrorOr<void> load();
+		
+		bool parse_elf64_file_header(const Elf64FileHeader&);
+		bool parse_elf64_program_header(const Elf64ProgramHeader&);
+		bool parse_elf64_section_header(const Elf64SectionHeader&);
+
+		bool parse_elf32_file_header(const Elf32FileHeader&);
+		bool parse_elf32_program_header(const Elf32ProgramHeader&);
+		bool parse_elf32_section_header(const Elf32SectionHeader&);
+
+	private:
+//#ifdef __is_kernel
+//		BAN::UniqPtr<Kernel::VirtualRange> m_storage;
+//		BAN::Span<const uint8_t> m_data;
+//#else
+		const BAN::Vector<uint8_t> m_data;
+//#endif
+	};
+
+}

LibELF/include/LibELF/LoadableELF.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#ifndef __is_kernel
+#error "This is kernel only header"
+#endif
+
+#include <BAN/UniqPtr.h>
+#include <BAN/Vector.h>
+
+#include <kernel/FS/Inode.h>
+#include <kernel/Memory/PageTable.h>
+
+#include <LibELF/Types.h>
+
+namespace LibELF
+{
+
+	class LoadableELF
+	{
+		BAN_NON_COPYABLE(LoadableELF);
+		BAN_NON_MOVABLE(LoadableELF);
+
+	public:
+		static BAN::ErrorOr<BAN::UniqPtr<LoadableELF>> load_from_inode(Kernel::PageTable&, BAN::RefPtr<Kernel::Inode>);
+		~LoadableELF();
+
+		Kernel::vaddr_t entry_point() const;
+
+		bool contains(Kernel::vaddr_t address) const;
+		void reserve_address_space();
+
+		BAN::ErrorOr<void> load_page_to_memory(Kernel::vaddr_t address);
+
+		BAN::ErrorOr<BAN::UniqPtr<LoadableELF>> clone(Kernel::PageTable&);
+
+		size_t virtual_page_count() const { return m_virtual_page_count; }
+		size_t physical_page_count() const { return m_physical_page_count; }
+
+	private:
+		LoadableELF(Kernel::PageTable&, BAN::RefPtr<Kernel::Inode>);
+		BAN::ErrorOr<void> initialize();
+
+	private:
+		BAN::RefPtr<Kernel::Inode>			m_inode;
+		Kernel::PageTable&					m_page_table;
+		ElfNativeFileHeader					m_file_header;
+		BAN::Vector<ElfNativeProgramHeader>	m_program_headers;
+		size_t m_virtual_page_count = 0;
+		size_t m_physical_page_count = 0;
+	};
+
+}

LibELF/include/LibELF/Types.h

@@ -80,16 +80,6 @@ namespace LibELF
 		Elf32Word p_align;
 	};
 
-	struct Elf32Dynamic
-	{
-		Elf32Sword d_tag;
-		union
-		{
-			Elf32Word d_val;
-			Elf32Addr d_ptr;
-		} d_un;
-	};
-
 	using Elf64Addr = uint64_t;
 	using Elf64Off = uint64_t;
 	using Elf64Half = uint16_t;
@@ -165,29 +155,21 @@ namespace LibELF
 		Elf64Xword p_align;
 	};
 
-	struct Elf64Dynamic
-	{
-		Elf64Sxword d_tag;
-		union
-		{
-			Elf64Xword d_val;
-			Elf64Addr d_ptr;
-		} d_un;
-	};
 
-#if ARCH(i686)
+#if ARCH(i386)
 	using ElfNativeAddr = Elf32Addr;
 	using ElfNativeOff = Elf32Off;
 	using ElfNativeHalf = Elf32Half;
 	using ElfNativeWord = Elf32Word;
 	using ElfNativeSword = Elf32Sword;
+	using ElfNativeXword = Elf32Xword;
+	using ElfNativeSxword = Elf32Sxword;
 	using ElfNativeFileHeader = Elf32FileHeader;
 	using ElfNativeSectionHeader = Elf32SectionHeader;
 	using ElfNativeSymbol = Elf32Symbol;
 	using ElfNativeRelocation = Elf32Relocation;
 	using ElfNativeRelocationA = Elf32RelocationA;
 	using ElfNativeProgramHeader = Elf32ProgramHeader;
-	using ElfNativeDynamic = Elf32Dynamic;
 #elif ARCH(x86_64)
 	using ElfNativeAddr = Elf64Addr;
 	using ElfNativeOff = Elf64Off;
@@ -202,7 +184,6 @@ namespace LibELF
 	using ElfNativeRelocation = Elf64Relocation;
 	using ElfNativeRelocationA = Elf64RelocationA;
 	using ElfNativeProgramHeader = Elf64ProgramHeader;
-	using ElfNativeDynamic = Elf64Dynamic;
 #endif
 
 }

LibELF/include/LibELF/Values.h

@@ -0,0 +1,140 @@
+#pragma once
+
+namespace LibELF
+{
+
+	enum ELF_Ident
+	{
+		ELFMAG0			= 0x7F,
+		ELFMAG1			= 'E',
+		ELFMAG2			= 'L',
+		ELFMAG3			= 'F',
+
+		ELFCLASSNONE	= 0,
+		ELFCLASS32		= 1,
+		ELFCLASS64		= 2,
+
+		ELFDATANONE		= 0,
+		ELFDATA2LSB		= 1,
+		ELFDATA2MSB		= 2,
+	};
+
+	enum ELF_EI
+	{
+		EI_MAG0			= 0,
+		EI_MAG1			= 1,
+		EI_MAG2			= 2,
+		EI_MAG3			= 3,
+		EI_CLASS		= 4,
+		EI_DATA			= 5,
+		EI_VERSION		= 6,
+		EI_OSABI		= 7,
+		EI_ABIVERSION	= 8,
+		EI_NIDENT		= 16,
+	};
+
+	enum ELF_ET
+	{
+		ET_NONE		= 0,
+		ET_REL		= 1,
+		ET_EXEC		= 2,
+		ET_DYN		= 3,
+		ET_CORE		= 4,
+		ET_LOOS		= 0xfe00,
+		ET_HIOS		= 0xfeff,
+		ET_LOPROC	= 0xff00,
+		ET_HIPROC	= 0xffff,
+	};
+
+	enum ELF_EV
+	{
+		EV_NONE		= 0,
+		EV_CURRENT	= 1,
+	};
+
+	enum ELF_SHT
+	{
+		SHT_NULL		= 0,
+		SHT_PROGBITS	= 1,
+		SHT_SYMTAB		= 2,
+		SHT_STRTAB		= 3,
+		SHT_RELA		= 4,
+		SHT_NOBITS		= 8,
+		SHT_REL			= 9,
+		SHT_SHLIB		= 10,
+		SHT_DYNSYM		= 11,
+		SHT_LOOS		= 0x60000000,
+		SHT_HIOS		= 0x6FFFFFFF,
+		SHT_LOPROC		= 0x70000000,
+		SHT_HIPROC		= 0x7FFFFFFF,
+	};
+
+	enum ELF_SHF
+	{
+		SHF_WRITE		= 0x1,
+		SHF_ALLOC		= 0x2,
+		SHF_EXECINSTR	= 0x4,
+		SHF_MASKOS		= 0x0F000000,
+		SHF_MASKPROC	= 0xF0000000,
+	};
+
+	enum ELF_SHN
+	{
+		SHN_UNDEF	= 0,
+		SHN_LOPROC	= 0xFF00,
+		SHN_HIPROC	= 0xFF1F,
+		SHN_LOOS	= 0xFF20,
+		SHN_HIOS	= 0xFF3F,
+		SHN_ABS		= 0xFFF1,
+		SHN_COMMON	= 0xFFF2,
+	};
+
+	enum ELF_STB
+	{
+		STB_LOCAL	= 0,
+		STB_GLOBAL	= 1,
+		STB_WEAK	= 2,
+		STB_LOOS	= 10,
+		STB_HIOS	= 12,
+		STB_LOPROC	= 13,
+		STB_HIPROC	= 15,
+	};
+
+	enum ELF_STT
+	{
+		STT_NOTYPE	= 0,
+		STT_OBJECT	= 1,
+		STT_FUNC	= 2,
+		STT_SECTION	= 3,
+		STT_FILE	= 4,
+		STT_LOOS	= 10,
+		STT_HIOS	= 12,
+		STT_LOPROC	= 13,
+		STT_HIPROC	= 15,
+	};
+
+	enum ELF_PT
+	{
+		PT_NULL		= 0,
+		PT_LOAD		= 1,
+		PT_DYNAMIC	= 2,
+		PT_INTERP	= 3,
+		PT_NOTE		= 4,
+		PT_SHLIB	= 5,
+		PT_PHDR		= 6,
+		PT_LOOS		= 0x60000000,
+		PT_HIOS		= 0x6FFFFFFF,
+		PT_LOPROC	= 0x70000000,
+		PT_HIPROC	= 0x7FFFFFFF,
+	};
+
+	enum ELF_PF
+	{
+		PF_X		= 0x1,
+		PF_W		= 0x2,
+		PF_R		= 0x4,
+		PF_MASKOS	= 0x00FF0000,
+		PF_MASKPROC	= 0xFF000000,
+	};
+
+}

PreLoad.cmake

@@ -0,0 +1 @@
+set(CMAKE_GENERATOR "Ninja" CACHE INTERNAL "" FORCE)

README.md

@@ -1,77 +1,8 @@
-[![](https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fbananymous.com%2Fbanan-os%2Ftokei.json&query=%24.lines&label=total%20lines)](https://git.bananymous.com/Bananymous/banan-os)
+![license](https://img.shields.io/github/license/bananymous/banan-os)
-[![](https://img.shields.io/github/commit-activity/m/Bananymous/banan-os)](https://git.bananymous.com/Bananymous/banan-os)
-[![](https://img.shields.io/github/license/bananymous/banan-os)](https://git.bananymous.com/Bananymous/banan-os/src/branch/main/LICENSE)
-[![](https://img.shields.io/discord/1242165176032297040?logo=discord&label=discord)](https://discord.gg/ehjGySwYdK)
 
 # banan-os
 
-This is my hobby operating system written in C++. Currently supports x86\_64 and i686 architectures.
+This is my hobby operating system written in C++. Currently supports only x86_64 architecture. We have a read-only ext2 filesystem, read-write ramfs, IDE disk drivers in ATA PIO mode, userspace processes, executable loading from ELF format, linear VBE graphics and multithreaded processing on single core.
-
-You can find a live demo [here](https://bananymous.com/banan-os)
-
-If you want to try out DOOM, you should first enter the GUI environment using the `start-gui` command. Then you can run `doom` in the GUI terminal.
-
-### Features
-
-#### General
-- [x] Ring3 userspace
-- [x] SMP (multiprocessing)
-- [x] Linear framebuffer (VESA and GOP)
-- [x] Network stack
-- [x] ELF executable loading
-- [x] AML interpreter (partial)
-- [x] Basic graphical environment
-  - [x] Terminal emulator
-  - [x] Status bar
-  - [x] Program launcher
-  - [ ] Some nice apps
-- [x] ELF dynamic linking
-- [x] copy-on-write memory
-  - [x] file mappings
-  - [ ] anonymous mappings
-
-#### Drivers
-- [x] NVMe disks
-- [x] ATA (IDE, SATA) disks
-- [x] E1000 and E1000E NICs
-- [x] RTL8111/8168/8211/8411 NICs
-- [x] PS2 keyboard (all scancode sets)
-- [x] PS2 mouse
-- [x] USB
-  - [x] xHCI
-  - [ ] EHCI
-  - [ ] OHCI
-  - [ ] UHCI
-  - [x] Keyboard
-  - [x] Mouse
-  - [x] Mass storage
-  - [x] Hubs
-  - [ ] ...
-- [ ] virtio devices (network, storage)
-
-#### Network
-- [x] ARP
-- [x] ICMP
-- [x] IPv4
-- [x] UDP
-- [x] TCP (partial and buggy)
-- [x] Unix domain sockets
-- [ ] SSL
-
-#### Filesystems
-- [x] Virtual filesystem
-- [x] Ext2
-- [x] FAT12/16/32
-- [x] Dev
-- [x] Ram
-- [x] Proc
-- [ ] Sys
-- [ ] 9P
-
-#### Bootloader support
-- [x] GRUB
-- [x] Custom BIOS bootloader
-- [ ] Custom UEFI bootloader
 
 ![screenshot from qemu running banan-os](assets/banan-os.png)
 
@@ -81,61 +12,44 @@ Each major component and library has its own subdirectory (kernel, userspace, li
 
 ## Building
 
-### Needed packages
+There does not exist a complete list of needed packages for building. From the top of my head I can say that *cmake*, *ninja*, *make*, *grub*, *rsync* and emulator (*qemu* or *bochs*) are needed.
 
-#### apt (tested on ubuntu 22.04)
+You can and *should* pass cmake variable QEMU_ACCEL set to proper accelerator to cmake commands. For example on Linux this means adding -DQEMU_ACCEL=kvm to the end of all cmake commands. 
-```# apt install build-essential git ninja-build texinfo bison flex libgmp-dev libmpfr-dev libmpc-dev parted qemu-system-x86 cpu-checker```
 
-#### pacman
+Create the build directory and cofigure cmake
-```# pacman -S --needed base-devel git wget cmake ninja parted qemu-system-x86```
+```sh
-
+mkdir build
-
+cd build
-### Compilation
+cmake ..
+```
 
 To build the toolchain for this os. You can run the following command.
 > ***NOTE:*** The following step has to be done only once. This might take a long time since we are compiling binutils and gcc.
 ```sh
-./bos toolchain
+ninja toolchain
+cmake --fresh .. # We need to reconfigure cmake to use the new compiler
+ninja libstdc++
 ```
 
-To build the os itself you can run one of the following commands. You will need root access for disk image creation/modification.
+To build the os itself you can run either of the following commands. You will need root access since the sysroot has "proper" permissions.
 ```sh
-./bos qemu
+ninja qemu
-./bos qemu-nographic
+ninja bochs
-./bos qemu-debug
-./bos bochs
 ```
 
 You can also build the kernel or disk image without running it:
 ```sh
-./bos kernel
+ninja kernel
-./bos image
+ninja image
 ```
 
-To build for other architectures set environment variable BANAN\_ARCH=*arch* (e.g. BANAN\_ARCH=i686).
+If you have corrupted your disk image or want to create new one, you can either manually delete *banan-os.img* and cmake will automatically create you a new one or you can run the following command.
-
-To change the bootloader you can set environment variable BANAN\_BOOTLOADER; supported values are BANAN (my custom bootloader) and GRUB.
-
-To run with UEFI set environment variable BANAN\_UEFI\_BOOT=1. You will also have to set OVMF\_PATH to the correct OVMF (default */usr/share/ovmf/x64/OVMF.fd*).
-
-To build an image with no physical root filesystem, but an initrd set environment variable BANAN\_INITRD=1. This can be used when testing on hardware with unsupported USB controller.
-
-If you have corrupted your disk image or want to create new one, you can either manually delete *build/banan-os.img* and build system will automatically create you a new one or you can run the following command.
 ```sh
-./bos image-full
+ninja image-full
 ```
 
-I have also created shell completion script for zsh. You can either copy the file in _script/shell-completion/zsh/\_bos_ to _/usr/share/zsh/site-functions/_ or add the _script/shell-completion/zsh_ to your fpath in _.zshrc_.
+> ***NOTE*** ```ninja clean``` has to be ran with root permissions, since it deletes the root filesystem.
 
-## Contributing
+### Contributing
 
-As the upstream is hosted on my server https://git.bananymous.com/Bananymous/banan-os, merging contributions is not as trivial as it would be on GitHub. You can still send PRs in GitHub in which case I should be able to download the diff and apply it manually. If you want, I can also provide you an account to my git server. In this case please contact me ([email](mailto:oskari.alaranta@bananymous.com), [discord](https://discord.gg/ehjGySwYdK)).
+Currently I don't accept contributions to this repository unless explicitly told otherwise. This is a learning project for me and I want to do everything myself. Feel free to fork/clone this repo and tinker with it yourself.
-
-As this is mostly a learning experience for me, I would appreciate if you first contacted me about adding new features (email, discord, issue, ...). If you send a PR about something I was planning on doing myself and you didn't ask me, I will probably just close it. Bug fixes are always welcome!
-
-Commit message should be formatted followingly
-
-  1. First line is of the form "_Subject: Description_", where _Subject_ tells the area touched (Kernel, Shell, BuildSystem, ...) and _Description_ is brief description of the change done. First line should fit fully in 72 characters.
-  2. Body of the message should further describe the change and reasoning behind the change.
-
-All commits should pass the pre-commit hook defined in _.pre-commit-config.yaml_. For instructions on how to setup pre-commit, please see https://pre-commit.com/#install.

bochs.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -e
 
 BOCHS_CONFIG_FILE=bochsrc
 COM1_TERMINAL=kitty
@@ -13,7 +14,7 @@ COM1_DEVICE=$(cat $COM1_DEVICE_FILE)
 rm $COM1_DEVICE_FILE
 
 cat > $BOCHS_CONFIG_FILE << EOF
-ata0-master: type=disk, path=$BANAN_DISK_IMAGE_PATH, status=inserted
+ata0-master: type=disk, path=$DISK_IMAGE_PATH, status=inserted
 boot: disk
 clock: sync=realtime, time0=local
 display_library: x, options="gui_debug"

bootloader/CMakeLists.txt

@@ -1,3 +0,0 @@
-cmake_minimum_required(VERSION 3.26)
-
-add_subdirectory(bios)

bootloader/bios/CMakeLists.txt

@@ -1,20 +0,0 @@
-cmake_minimum_required(VERSION 3.26)
-
-project(bootloader ASM)
-
-set(BOOTLOADER_SOURCES
-	a20_line.S
-	boot.S
-	command_line.S
-	disk.S
-	elf.S
-	ext2.S
-	framebuffer.S
-	memory_map.S
-	utils.S
-)
-
-add_executable(bootloader ${BOOTLOADER_SOURCES})
-include_directories(${CMAKE_CURRENT_SOURCE_DIR})
-target_link_options(bootloader PRIVATE LINKER:-T,${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
-target_link_options(bootloader PRIVATE -nostdlib)

bootloader/bios/a20_line.S

@@ -1,168 +0,0 @@
-.code16
-.section .stage2
-
-# checks whether A20 line is enabled or disabled
-# return
-#	ax: 1 if enabled, 0 otherwise
-check_a20:
-	pushf
-	pushw %si
-	pushw %di
-	pushw %ds
-	pushw %es
-
-	cli
-
-	xorw %ax, %ax
-	movw %ax, %es
-	notw %ax
-	movw %ax, %ds
-
-	movw $0x0500, %di
-	movw $0x0510, %si
-
-	movb %es:(%di), %al
-	pushw %ax
-
-	movb %ds:(%si), %al
-	pushw %ax
-
-	movb $0x00, %es:(%di)
-	movb $0xFF, %ds:(%si)
-
-	cmpb $0xFF, %es:(%di)
-
-	pop %ax
-	movb %al, %ds:(%si)
-
-	pop %ax
-	movb %al, %es:(%di)
-
-	movw $0, %ax
-	je .check_a20_done
-
-	movw $1, %ax
-
- .check_a20_done:
-	popw %es
-	popw %ds
-	popw %di
-	popw %si
-	popf
-	ret
-
-
-# Try to enable A20 using PS2 controller
-enable_a20_ps2:
-	pushf
-	pushw %ax
-
-	cli
-
-	# disable first port
-	call .enable_a20_ps2_wait1
-	movb $0xAD, %al
-	outb %al, $0x64
-
-	# read controller output
-	call .enable_a20_ps2_wait1
-	movb $0xD0, %al
-	outb %al, $0x64
-
-	call .enable_a20_ps2_wait2
-	inb $0x60, %al
-	pushw %ax
-
-	# write controller output
-	call .enable_a20_ps2_wait1
-	movb $0xD1, %al
-	outb %al, $0x64
-
-	call .enable_a20_ps2_wait1
-	popw %ax
-	orw $2, %ax
-	outb %al, $0x60
-
-	# enable first port
-	call .enable_a20_ps2_wait1
-	movb $0xAE, %al
-	outb %al, $0x64
-
-	call .enable_a20_ps2_wait1
-
-	popw %ax
-	popf
-	ret
-
- .enable_a20_ps2_wait1:
-	inb $0x64, %al
-	test $2, %al
-	jnz .enable_a20_ps2_wait1
-	ret
-
- .enable_a20_ps2_wait2:
-	inb $0x64, %al
-	test $1, %al
-	jnz .enable_a20_ps2_wait1
-	ret
-
-
-# Check if A20 line is disabled. If it is, try to enable it
-.global enable_a20
-enable_a20:
-	pushw %ax
-	pushw %si
-
-	call check_a20
-	testw %ax, %ax
-	jnz .enable_a20_done
-
-	movw $a20_line_disabled_msg, %si
-	call puts; call print_newline
-
-	# Try to enable A20 line using bios interrupt
-	movw $0x2401, %ax
-	int $0x15
-	call check_a20
-	testw %ax, %ax
-	jnz .enable_a20_done
-
-	# Try to enable A20 line using ps2 controller
-	call enable_a20_ps2
-	call check_a20
-	testw %ax, %ax
-	jnz .enable_a20_done
-
-	# Try to enable A20 line using fast A20 gate
-	inb $0x92, %al
-	testb $2, %al
-	jnz .enable_a20_fast_done
-	orb $2, %al
-	outb %al, $0x92
- .enable_a20_fast_done:
-
-	call check_a20
-	testw %ax, %ax
-	jnz .enable_a20_done
-
-	movw $a20_could_not_enable_msg, %si
-	call print_and_halt
-
- .enable_a20_done:
-	movw $a20_line_enabled_msg, %si
-	call puts; call print_newline
-
-	popw %si
-	popw %ax
-	ret
-
-.section .data
-
-a20_line_disabled_msg:
-	.asciz "A20 line disabled. Trying to enable it"
-
-a20_line_enabled_msg:
-	.asciz "A20 line enabled"
-
-a20_could_not_enable_msg:
-	.asciz "Could not enable A20 line"

bootloader/bios/boot.S

@@ -1,176 +0,0 @@
-.include "common.S"
-
-.code16
-
-#########################################
-#
-# STAGE 1 BOOTLOADER
-#
-# its sole purpose is to load stage2 from
-# bios boot partition
-#
-#########################################
-
-.section .stage1
-
-.global stage1_main
-stage1_main:
-	# setup segments and stack
-	xorw %ax, %ax
-	movw %ax, %ds
-	movw %ax, %es
-	movw %ax, %ss
-	movl $0x7C00, %esp
-
-	# save boot disk number
-	call read_stage2_into_memory
-
-	jmp stage2_main
-
-.global print_and_halt
-print_and_halt:
-	call puts
-halt:
-	hlt
-	jmp halt
-
-
-#########################################
-#
-# STAGE 2 BOOTLOADER
-#
-#########################################
-
-.section .stage2
-
-stage2_main:
-	# clear screen and enter 80x25 text mode
-	movb $0x03, %al
-	movb $0x00, %ah
-	int $0x10
-
-	# print hello message
-	movw $hello_msg, %si
-	call puts; call print_newline
-
-	lgdt gdtr
-
-	call enter_unreal_mode
-	movw $unreal_enter_msg, %si
-	call puts; call print_newline
-
-	call enable_a20
-
-	call get_memory_map
-
-	call print_newline
-	call read_user_command_line
-
-	call print_newline
-
-	movw $start_kernel_load_msg, %si
-	call puts; call print_newline
-
-	call print_memory_map
-
-	call find_root_disk
-	call find_root_partition
-
-	call print_root_partition_info
-	call print_newline
-
-	call has_ext2_filesystem
-	testb %al, %al
-	jz print_and_halt
-
-	call ext2_find_kernel
-	movl $ext2_inode_read_bytes, %esi
-
-	call elf_read_kernel_to_memory
-
-	call vesa_set_video_mode
-
-	cli
-
-	# kernel entry point
-	movl %eax, %ecx
-
-	# setup kernel parameters
-	movl $0xD3C60CFF, %eax
-	movl $banan_boot_info, %ebx
-
-	# setup protected mode
-	movl %cr0, %edx
-	orb $1, %dl
-	movl %edx, %cr0
-
-	# jump to protected mode
-	ljmpl $GDT_CODE32, $protected_mode
-
-.code32
-protected_mode:
-	# setup protected mode segments
-	movw $GDT_DATA32, %dx
-	movw %dx, %ds
-	movw %dx, %es
-	movw %dx, %fs
-	movw %dx, %gs
-	movw %dx, %ss
-
-	# jump to kernel entry
-	jmp *%ecx
-
-
-.code16
-enter_unreal_mode:
-	cli
-	pushw %ds
-
-	movl %cr0, %eax
-	orb $1, %al
-	movl %eax, %cr0
-	ljmpl $GDT_CODE16, $.enter_unreal_mode_pmode
-
- .enter_unreal_mode_pmode:
-	movw $GDT_DATA32, %bx
-	movw %bx, %ds
-
-	andb $0xFE, %al
-	movl %eax, %cr0
-	ljmpl $0x00, $.enter_unreal_mode_unreal
-
- .enter_unreal_mode_unreal:
-	popw %ds
-	sti
-
-	ret
-
-.section .data
-
-hello_msg:
-	.asciz "This is banan-os bootloader"
-
-unreal_enter_msg:
-	.asciz "Entered unreal mode"
-
-start_kernel_load_msg:
-	.asciz "Starting to load kernel"
-
-gdt:
-	.quad 0x0000000000000000
-	.quad 0x008F9A000000FFFF # 16-bit code
-	.quad 0x00CF92000000FFFF # 32-bit data
-	.quad 0x00CF9A000000FFFF # 32-bit code
-gdtr:
-	.short . - gdt - 1
-	.long gdt
-
-banan_boot_info:
-	boot_command_line:
-		.long command_line
-	boot_framebuffer:
-		.long framebuffer
-	boot_memory_map:
-		.long memory_map
-	boot_kernel_paddr:
-		.long 0

bootloader/bios/command_line.S

@@ -1,87 +0,0 @@
-.code16
-
-.section .stage2
-
-# fills command line buffer
-# NO REGISTERS SAVED
-.global read_user_command_line
-read_user_command_line:
-	# print initial command line
-	movw $command_line_enter_msg, %si
-	call puts
-	movw $command_line_buffer, %si
-	call puts
-
-	# prepare registers for input
-	movw $command_line_enter_msg, %si
-	movw $command_line_buffer, %di
- .read_user_command_line_goto_end:
-	cmpb $0, (%di)
-	jz .read_user_command_line_loop
-	incw %di
-	jmp .read_user_command_line_goto_end
-
- .read_user_command_line_loop:
-	call getc
-
-	cmpb $'\b', %al
-	je .read_user_command_line_backspace
-	cmpb $0x7F, %al
-	je .read_user_command_line_backspace
-
-	# Not sure if some BIOSes return '\n' as enter, but check it just in case
-	cmpb $'\r', %al
-	je .read_user_command_line_done
-	cmpb $'\n', %al
-	je .read_user_command_line_done
-
-	pushw %ax
-
-	call isprint
-	testb %al, %al
-	jz .read_user_command_line_loop
-
-	popw %ax
-
-	# put byte to buffer
-	movb %al, (%di)
-	incw %di
-
-	# print byte
-	call putc
-
-	jmp .read_user_command_line_loop
-
- .read_user_command_line_backspace:
-	# don't do anything if at the beginning
-	cmpw $command_line_buffer, %di
-	je .read_user_command_line_loop
-
-	# decrement buffer pointer
-	decw %di
-
-	# erase byte in display
-	call print_backspace
-
-	jmp .read_user_command_line_loop
-
- .read_user_command_line_done:
-	# null terminate command line
-	movb $0, (%di)
-
-	call print_newline
-
-	ret
-
-
-.section .data
-
-command_line_enter_msg:
-	.asciz "cmdline: "
-
-.global command_line
-command_line:
-# 100 character command line
-command_line_buffer:
-	.ascii "root=/dev/sda2"
-	.skip 100 - (. - command_line_buffer)

bootloader/bios/common.S

@@ -1,3 +0,0 @@
-.set GDT_CODE16, 0x08
-.set GDT_DATA32, 0x10
-.set GDT_CODE32, 0x18

bootloader/bios/disk.S

@@ -1,518 +0,0 @@
-# FIXME: don't assume 512 byte sectors
-.set SECTOR_SIZE_SHIFT,	9
-.set SECTOR_SIZE,		1 << SECTOR_SIZE_SHIFT
-
-.code16
-
-.section .stage1
-
-.global stage2_start
-.global stage2_end
-
-# check that drive has int13 ext
-#	dl: drive number
-# returns only if drive does have the extension
-drive_has_int13_ext:
-	pusha
-
-	movb $0x41, %ah
-	movw $0x55AA, %bx
-	int $0x13
-	jc .drive_has_int13_ext_no_int13_ext
-
-	popa
-	ret
-
- .drive_has_int13_ext_no_int13_ext:
-	mov $no_int13_ext_msg, %si
-	jmp print_and_halt
-
-
-# read sectors from disk
-# bx:eax:	lba start
-# cx:		lba count (has to less than 0x80)
-# dl:		drive number
-# ds:di:	physical address
-# returns only on success
-.global read_from_disk
-read_from_disk:
-	pusha
-
-	call drive_has_int13_ext
-
-	# prepare disk read packet
-	movw $disk_address_packet, %si
-	movb $0x10,	0x00(%si)	# packet size
-	movb $0x00,	0x01(%si)	# always 0
-	movw %cx,	0x02(%si)	# lba count
-	movw %di,	0x04(%si)	# offset
-	movw %ds,	0x06(%si)	# segment
-	movl %eax,	0x08(%si)	# 32 bit lower lba
-	movw %bx,	0x0C(%si)	# 16 bit upper lba
-	movw $0,	0x0E(%si)	# zero
-
-	# issue read command
-	mov $0x42, %ah
-	int $0x13
-	jc .read_from_disk_failed
-
-	popa
-	ret
-
- .read_from_disk_failed:
-	mov $read_from_disk_msg, %si
-	jmp print_and_halt
-
-
-# Reads GPT header into gpt_header buffer
-#	dl: drive number
-# return:
-#	ax: 1 if has GPT header, 0 otherwise
-.global read_gpt_header
-read_gpt_header:
-	pushw %bx
-	pushw %cx
-	pushw %di
-
-	xorw %bx, %bx
-	movl $1, %eax
-	movw $1, %cx
-	movw $gpt_header, %di
-	call read_from_disk
-
-	xorw %bx, %bx
-	movw $1, %ax
-
-	# check if header starts with 'EFI PART'
-	cmpl $0x20494645, (gpt_header + 0)
-	cmovnew %bx, %ax
-	cmpl $0x54524150, (gpt_header + 4)
-	cmovnew %bx, %ax
-
-	popw %di
-	popw %cx
-	popw %bx
-	ret
-
-
-# Find bios boot partition from boot drive
-# returns:
-#	bx:eax:	first lba
-#	cx:		sector count
-find_stage2_partition:
-	# read boot disk GPT header
-	movb (boot_disk_number), %dl
-	call read_gpt_header
-
-	testb %al, %al
-	jz .find_stage2_partition_not_gpt
-
-	# eax := entry_count
-	movl (gpt_header + 80), %eax
-	test %eax, %eax
-	jz .find_stage2_partition_not_found
-
-	# edx:eax := eax * entry_size
-	mull (gpt_header + 84)
-	test %edx, %edx
-	jnz .find_stage2_partition_too_big_entries
-
-	# FIXME: read one entry array section at a time
-
-	# sector count := (arr_size + SECTOR_SIZE - 1) / SECTOR_SIZE
-	movl %eax, %ecx
-	shrl $SECTOR_SIZE_SHIFT, %ecx
-
-	# start lba
-	movl (gpt_header + 72), %eax
-	movw (gpt_header + 76), %bx
-
-	movw $gpt_entry_data, %di
-	movw $bios_boot_guid, %si
-	movb (boot_disk_number), %dl
-
-	call read_from_disk
-
-	# NOTE: 'only' 0xFFFF partitions supported,
-	#       although read will fail with more than 0x80
-	movw (gpt_header + 80), %cx
-
- .find_stage2_partition_loop_gpt_entries:
-	pushw %cx
-	movw $16, %cx
-	call memcmp
-	popw %cx
-
-	testb %al, %al
-	jnz .find_stage2_partition_found
-
-	# add entry size to entry pointer
-	addw (gpt_header + 84), %di
-
-	loop .find_stage2_partition_loop_gpt_entries
-
-	# fall through to not found case
- .find_stage2_partition_not_found:
-	movw $no_bios_boot_partition_msg, %si
-	jmp print_and_halt
-
- .find_stage2_partition_not_gpt:
-	movw $not_gpt_partition_msg, %si
-	jmp print_and_halt
-
- .find_stage2_partition_too_big_entries:
-	movw $too_gpt_big_entries_msg, %si
-	jmp print_and_halt
-
- .find_stage2_partition_found:
-	# first lba
-	movl 32(%di), %eax
-	movw 36(%di), %bx
-
-	# count := last lba - first lba + 1
-	movl 40(%di), %ecx
-	subl %eax, %ecx
-	incl %ecx
-
-	ret
-
-# reads stage2 into memory
-#	dl: boot drive number
-# returns only on success
-.global read_stage2_into_memory
-read_stage2_into_memory:
-	movb %dl, (boot_disk_number)
-
-	# push stage2 sector count
-	movl $stage2_end, %eax
-	subl $stage2_start, %eax
-	addl $(SECTOR_SIZE - 1), %eax
-	movl $SECTOR_SIZE, %ecx
-	xorl %edx, %edx
-	divl %ecx
-	pushl %eax
-
-	call find_stage2_partition
-
-	movb (boot_disk_number), %dl
-	popl %ecx # FIXME: validate that partition has enough sectors
-	movw $stage2_start, %di
-	call read_from_disk
-
-	ret
-
-# 21686148-6449-6E6F-744E-656564454649
-.align 4
-bios_boot_guid:
-	.long 0x21686148		# little endian
-	.word 0x6449			# little endian
-	.word 0x6E6F			# little endian
-	.word 0x4E74			# big endian
-	.quad 0x494645646565	# big endian
-
-boot_disk_number:
-	.skip 1
-
-read_from_disk_msg:
-	.asciz "read error"
-
-no_int13_ext_msg:
-	.asciz "no INT13 ext"
-
-no_bios_boot_partition_msg:
-	.asciz "no bios boot"
-
-too_gpt_big_entries_msg:
-	.asciz "too big GPT array"
-
-not_gpt_partition_msg:
-	.asciz "not GPT"
-
-
-.section .stage2
-
-# check if drive exists
-#	dl: drive number
-# return:
-#	al: 1 if disk is usable, 0 otherwise
-drive_exists:
-	pusha
-
-	movb $0x48, %ah
-	movw $disk_drive_parameters, %si
-	movw $0x1A, (disk_drive_parameters) # set buffer size
-
-	int $0x13
-	jc .drive_exists_nope
-
-	popa
-	movb $1, %al
-	ret
-
- .drive_exists_nope:
-	popa
-	movb $0, %al
-	ret
-
-# find root disk and populate root_disk_drive_number field
-# NO REGISTERS SAVED
-.global find_root_disk
-find_root_disk:
-	movb $0x80, %dl
-
- .find_root_disk_loop:
-	call drive_exists
-	testb %al, %al
-	jz .find_root_disk_not_found
-
-	# read GPT header
-	xorw %bx, %bx
-	movl $1, %eax
-	movw $1, %cx
-	movw $gpt_header, %di
-	call read_from_disk
-
-	# confirm header (starts with 'EFI PART')
-	cmpl $0x20494645, (gpt_header + 0)
-	jne .find_root_disk_next_disk
-	cmpl $0x54524150, (gpt_header + 4)
-	jne .find_root_disk_next_disk
-
-	# compare disk GUID
-	movw $root_disk_guid, %si
-	movw $(gpt_header + 56), %di
-	movw $16, %cx
-	call memcmp
-	testb %al, %al
-	jz .find_root_disk_next_disk
-
-	movw $root_disk_found_msg, %si
-	call puts; call print_newline
-
-	movb %dl, (root_disk_drive_number)
-	ret
-
- .find_root_disk_next_disk:
-	incb %dl
-	jmp .find_root_disk_loop
-
- .find_root_disk_not_found:
-	movw $root_disk_not_found_msg, %si
-	jmp print_and_halt
-
-
-# finds root partition from root disk
-# fills root_partition_entry data structure
-# NOTE: assumes GPT header is in `gpt_header`
-# NO REGISTERS SAVED
-# return:
-#	dl:		drive number
-#	ecx:	sector count (capped at 0xFFFFFFFF)
-#	bx:eax:	first sector
-.global find_root_partition
-find_root_partition:
-	pushl %ebp
-	movl %esp, %ebp
-	subl $16, %esp
-
-	# esp + 0: 8 byte entry array lba
-	movl (gpt_header + 72), %eax
-	movl %eax, 0(%esp)
-	movl (gpt_header + 76), %eax
-	movl %eax, 4(%esp)
-	# FIXME: check that bits 48-63 are zero
-
-	# esp + 8: 4 byte entries per sector
-	xorl %edx, %edx
-	movl $SECTOR_SIZE, %eax
-	divl (gpt_header + 84)
-	movl %eax, 8(%esp)
-
-	# esp + 12: 4 byte entries remaining
-	movl (gpt_header + 80), %eax
-	testl %eax, %eax
-	jz .find_root_partition_not_found
-	movl %eax, 12(%esp)
-
- .find_root_partition_read_entry_section:
-	movl 0(%esp), %eax
-	movl 4(%esp), %ebx
-	movw $1, %cx
-	movb (root_disk_drive_number), %dl
-	movw $sector_buffer, %di
-	call read_from_disk
-
-	# ecx: min(entries per section, entries remaining)
-	movl 8(%esp), %ecx
-	cmpl 12(%esp), %ecx
-	jae .find_root_partition_got_entry_count
-	movl 12(%esp), %ecx
-
- .find_root_partition_got_entry_count:
-	# update entries remaining
-	subl %ecx, 12(%esp)
-
-	# si: entry pointer
-	movw $sector_buffer, %si
-
- .find_root_partition_loop_entries:
-	# temporarily save cx in dx
-	movw %cx, %dx
-
-	# check that entry is used
-	movw $16, %cx
-	movw $zero_guid, %di
-	call memcmp
-	test %al, %al
-	jnz .find_root_partition_next_entry
-
-	# compare entry guid to root guid
-	movw $16, %cx
-	addw $16, %si
-	movw $root_partition_guid, %di
-	call memcmp
-	subw $16, %si
-
-	testb %al, %al
-	jnz .find_root_partition_found
-
- .find_root_partition_next_entry:
-
-	# restore cx
-	movw %dx, %cx
-
-	# entry pointer += entry size
-	addw (gpt_header + 84), %si
-	loop .find_root_partition_loop_entries
-
-	# entry not found in this sector
-
-	# increment 8 byte entry array lba
-	incl 0(%esp)
-	adcl $0, 4(%esp)
-
-	# loop to read next section if entries remaining
-	cmpl $0, 12(%esp)
-	jnz .find_root_partition_read_entry_section
-
- .find_root_partition_not_found:
-	movw $root_partition_not_found_msg, %si
-	jmp print_and_halt
-
- .find_root_partition_found:
-	# copy entry to buffer
-	movw $root_partition_entry, %di
-	movw $128, %cx
-	rep movsb
-
-	movw $root_partition_found_msg, %si
-	call puts; call print_newline
-
-	# ebx:eax := last lba
-	movl (root_partition_entry + 44), %ebx
-	movl (root_partition_entry + 40), %eax
-
-	# ebx:eax -= first lba - 1
-	subl (root_partition_entry + 36), %ebx
-	movl (root_partition_entry + 32), %ecx
-	decl %ecx
-	subl %ecx, %eax
-	sbbl $0, %ebx
-
-	# ecx: min(partition count, 0xFFFFFFFF)
-	movl $0xFFFFFFFF, %edx
-	movl %eax, %ecx
-	testl %ebx, %ebx
-	cmovnzl %edx, %ecx
-
-	# ebx:eax := first lba
-	# FIXME: confirm ebx bits 16:31 are zero
-	movl (root_partition_entry + 36), %ebx
-	movl (root_partition_entry + 32), %eax
-
-	movb (root_disk_drive_number), %dl
-
-	leavel
-	ret
-
-
-# print information about root partition
-.global print_root_partition_info
-print_root_partition_info:
-	pushw %ax
-	pushw %bx
-	pushw %cx
-	pushw %si
-
-	movw $root_partition_info_start_msg, %si
-	call puts;
-
-	movw $16, %bx
-	movw $2,  %cx
-	movw (root_partition_entry + 38), %ax; call print_number
-	movw (root_partition_entry + 36), %ax; call print_number
-	movw (root_partition_entry + 34), %ax; call print_number
-	movw (root_partition_entry + 32), %ax; call print_number
-
-	movb $'-', %al; call putc
-	movb $'>', %al; call putc
-
-	movw (root_partition_entry + 46), %ax; call print_number
-	movw (root_partition_entry + 44), %ax; call print_number
-	movw (root_partition_entry + 42), %ax; call print_number
-	movw (root_partition_entry + 40), %ax; call print_number
-
-	call print_newline
-
-	popw %si
-	popw %cx
-	popw %bx
-	popw %ax
-	ret
-
-.section .data
-
-# These will be patched during bootloader installation
-root_disk_guid:
-	.ascii "root disk guid  "
-root_partition_guid:
-	.ascii "root part guid  "
-zero_guid:
-	.skip 16, 0
-
-root_disk_found_msg:
-	.asciz "Root disk found!"
-root_disk_not_found_msg:
-	.asciz "Root disk not found"
-
-root_partition_found_msg:
-	.asciz "Root partition found!"
-root_partition_not_found_msg:
-	.asciz "Root partition not found"
-
-root_partition_info_start_msg:
-	.asciz "Root partition: "
-
-.section .bss
-
-.align SECTOR_SIZE
-gpt_header:
-	.skip SECTOR_SIZE
-gpt_entry_data:
-	.skip SECTOR_SIZE
-sector_buffer:
-	.skip SECTOR_SIZE
-
-disk_address_packet:
-	.skip 16
-
-disk_drive_parameters:
-	.skip 0x1A
-	.skip 2 # padding
-
-root_disk_drive_number:
-	.skip 1
-	.skip 3 # padding
-
-root_partition_entry:
-	.skip 128

bootloader/bios/elf.S

@@ -1,320 +0,0 @@
-.set SECTOR_SIZE,	512
-
-# file header field offsets
-.set e_type,		16
-.set e_machine,		18
-.set e_version,		20
-.set e_entry,		24
-
-.set e32_phoff,		28
-.set e32_shoff,		32
-.set e32_flags,		36
-.set e32_ehsize,	40
-.set e32_phentsize,	42
-.set e32_phnum,		44
-.set e32_shentsize,	46
-.set e32_shnum,		48
-.set e32_shstrndx,	50
-
-.set e64_phoff,		32
-.set e64_shoff,		40
-.set e64_flags,		48
-.set e64_ehsize,	52
-.set e64_phentsize,	54
-.set e64_phnum,		56
-.set e64_shentsize,	58
-.set e64_shnum,		60
-.set e64_shstrndx,	62
-
-# e_ident offsets
-.set EI_CLASS,		4
-.set EI_DATA,		5
-.set EI_VERSION,	6
-
-# e_ident constants
-.set ELFMAGIC,		0x464C457F
-.set ELFCLASS32,	1
-.set ELFCLASS64,	2
-.set ELFDATA2LSB,	1
-.set EV_CURRENT,	1
-
-# e_type constants
-.set ET_EXEC,		2
-
-# program header field offsets
-.set p_type,		0
-
-.set p32_offset,	4
-.set p32_vaddr,		8
-.set p32_paddr,		12
-.set p32_filesz,	16
-.set p32_memsz,		20
-.set p32_flags,		24
-.set p32_align,		28
-
-.set p64_flags,		4
-.set p64_offset,	8
-.set p64_vaddr,		16
-.set p64_paddr,		24
-.set p64_filesz,	32
-.set p64_memsz,		40
-.set p64_align,		48
-
-# p_type constants
-.set PT_NULL,		0
-.set PT_LOAD,		1
-
-# mask for entry point and segment loading
-.set LOAD_MASK,		0x07FFFFFF
-
-.code16
-.section .stage2
-
-# Validate file header stored in elf_file_header
-# returns only on success
-elf_validate_file_header:
-	cmpl $ELFMAGIC, (elf_file_header)
-	jne .elf_validate_file_header_invalid_magic
-
-	cmpb $ELFCLASS32, (elf_file_header + EI_CLASS)
-	je .elf_validate_file_header_class_valid
-	cmpb $ELFCLASS64, (elf_file_header + EI_CLASS)
-	je .elf_validate_file_header_class_valid
-	jmp .elf_validate_file_header_invalid_class
- .elf_validate_file_header_class_valid:
-
-	cmpb $ELFDATA2LSB, (elf_file_header + EI_DATA)
-	jne .elf_validate_file_header_only_little_endian_supported
-
-	cmpb $EV_CURRENT, (elf_file_header + EI_VERSION)
-	jne .elf_validate_file_header_not_current_version
-
-	cmpl $EV_CURRENT, (elf_file_header + e_version)
-	jne .elf_validate_file_header_not_current_version
-
-	cmpw $ET_EXEC, (elf_file_header + e_type)
-	jne .elf_validate_file_header_not_executable
-
-	ret
-
- .elf_validate_file_header_invalid_magic:
-	movw $elf_validate_file_header_invalid_magic_msg, %si
-	jmp print_and_halt
- .elf_validate_file_header_invalid_class:
-	movw $elf_validate_file_header_invalid_class_msg, %si
-	jmp print_and_halt
- .elf_validate_file_header_only_little_endian_supported:
-	movw $elf_validate_file_header_only_little_endian_supported_msg, %si
-	jmp print_and_halt
- .elf_validate_file_header_not_current_version:
-	movw $elf_validate_file_header_not_current_version_msg, %si
-	jmp print_and_halt
- .elf_validate_file_header_not_executable:
-	movw $elf_validate_file_header_not_executable_msg, %si
-	jmp print_and_halt
-
-# reads memory specified by 32 bit elf_program_header to memory
-elf_read_program_header32_to_memory:
-	pushal
-	pushl %ebp
-	movl %esp, %ebp
-
-	# memset p_filesz -> p_memsz to 0
-	movl (elf_program_header + p32_filesz), %ebx
-	movl (elf_program_header + p32_vaddr),  %edi
-	andl $LOAD_MASK, %edi
-	addl %ebx, %edi
-	movl (elf_program_header + p32_memsz),  %ecx
-	subl %ebx, %ecx
-	xorb %al, %al; call memset32
-
-	# read file specified in program header to memory
-	movl (elf_program_header + p32_offset), %eax
-	movl (elf_program_header + p32_vaddr),  %edi
-	andl $LOAD_MASK, %edi
-	movl (elf_program_header + p32_filesz), %ecx
-	call *%esi
-
-	leavel
-	popal
-	ret
-
-
-# reads memory specified by 64 bit elf_program_header to memory
-elf_read_program_header64_to_memory:
-	pushal
-	pushl %ebp
-	movl %esp, %ebp
-
-	# memset p_filesz -> p_memsz to 0
-	movl (elf_program_header + p64_filesz), %ebx
-	movl (elf_program_header + p64_vaddr),  %edi
-	andl $LOAD_MASK, %edi
-	addl %ebx, %edi
-	movl (elf_program_header + p64_memsz),  %ecx
-	subl %ebx, %ecx
-	xorb %al, %al; call memset32
-
-	# read file specified in program header to memory
-	movl (elf_program_header + p64_offset), %eax
-	movl (elf_program_header + p64_vaddr),  %edi
-	andl $LOAD_MASK, %edi
-	movl (elf_program_header + p64_filesz), %ecx
-	call *%esi
-
-	leavel
-	popal
-	ret
-
-
-# read callback format
-#	eax: first byte
-#	ecx: byte count
-#	edi: buffer
-# returns only on success
-
-
-# reads kernel to memory
-#	esi:	callback for reading from kernel image
-# return:
-#	eax:	kernel entry address
-.global elf_read_kernel_to_memory
-elf_read_kernel_to_memory:
-	pushal
-	pushl %ebp
-	movl %esp, %ebp
-	subl $2, %esp
-
-	# read start of file header
-	movl $0, %eax
-	movl $24, %ecx
-	movl $elf_file_header, %edi
-	call *%esi
-
-	call elf_validate_file_header
-
-	# determine file header size
-	movl $52, %ecx
-	movl $64, %edx
-	cmpb $ELFCLASS64, (elf_file_header + EI_CLASS)
-	cmovel %edx, %ecx
-
-	# read full file header
-	movl $0, %eax
-	movl $elf_file_header, %edi
-	call *%esi
-
-	# verify that e_phoff fits in 32 bits
-	cmpb $ELFCLASS64, (elf_file_header + EI_CLASS)
-	jne .elf_read_kernel_to_memory_valid_offset
-	cmpl $0, (elf_file_header + e64_phoff + 4)
-	jnz .elf_read_kernel_to_memory_unsupported_offset
- .elf_read_kernel_to_memory_valid_offset:
-
-	# read architecture phentsize and phnum to fixed locations
-	movw (elf_file_header + e32_phentsize), %ax
-	movw (elf_file_header + e32_phnum),     %bx
-	movl (elf_file_header + e32_phoff),     %ecx
-	cmpb $ELFCLASS64, (elf_file_header + EI_CLASS)
-	cmovew (elf_file_header + e64_phentsize), %ax
-	cmovew (elf_file_header + e64_phnum),     %bx
-	cmovel (elf_file_header + e64_phoff),     %ecx
-	movw %ax,  (elf_file_header_phentsize)
-	movw %bx,  (elf_file_header_phnum)
-	movl %ecx, (elf_file_header_phoff)
-
-	# current program header
-	movw $0, -2(%ebp)
-
- .elf_read_kernel_to_memory_loop_program_headers:
-	movw -2(%ebp), %cx
-	cmpw (elf_file_header_phnum), %cx
-	jae .elf_read_kernel_to_memory_done
-
-	# eax := program_header_index * e_phentsize + e_phoff
-	xorl %eax, %eax
-	movw %cx, %ax
-	xorl %ebx, %ebx
-	movw (elf_file_header_phentsize), %bx
-	mull %ebx
-	addl (elf_file_header_phoff), %eax
-	jc .elf_read_kernel_to_memory_unsupported_offset
-
-	# determine program header size
-	movl $32, %ecx
-	movl $56, %edx
-	cmpb $ELFCLASS64, (elf_file_header + EI_CLASS)
-	cmovel %edx, %ecx
-
-	# read program header
-	movl $elf_program_header, %edi
-	call *%esi
-
-	# test if program header is NULL header
-	cmpl $PT_NULL, (elf_program_header + p_type)
-	je .elf_read_kernel_to_memory_null_program_header
-
-	# confirm that the program header is loadable
-	cmpl $PT_LOAD, (elf_program_header + p_type)
-	jne .elf_read_kernel_to_memory_not_loadable_header
-
-	# read program header to memory
-	movl $elf_read_program_header32_to_memory, %eax
-	movl $elf_read_program_header64_to_memory, %ebx
-	cmpb $ELFCLASS64, (elf_file_header + EI_CLASS)
-	cmovel %ebx, %eax
-	call *%eax
-
- .elf_read_kernel_to_memory_null_program_header:
-	incw -2(%ebp)
-	jmp .elf_read_kernel_to_memory_loop_program_headers
-
- .elf_read_kernel_to_memory_done:
-	leavel
-	popal
-
-	# set kernel entry address
-	movl (elf_file_header + e_entry), %eax
-	andl $LOAD_MASK, %eax
-
-	ret
-
- .elf_read_kernel_to_memory_unsupported_offset:
-	movw $elf_read_kernel_to_memory_unsupported_offset_msg, %si
-	jmp print_and_halt
- .elf_read_kernel_to_memory_not_loadable_header:
-	movw $elf_read_kernel_to_memory_not_loadable_header_msg, %si
-	jmp print_and_halt
-
-.section .data
-
-elf_validate_file_header_invalid_magic_msg:
-	.asciz "ELF: file has invalid ELF magic"
-elf_validate_file_header_invalid_class_msg:
-	.asciz "ELF: file has invalid ELF class"
-elf_validate_file_header_only_little_endian_supported_msg:
-	.asciz "ELF: file is not in little endian format"
-elf_validate_file_header_not_current_version_msg:
-	.asciz "ELF: file is not in current ELF version"
-elf_validate_file_header_not_executable_msg:
-	.asciz "ELF: file is not an executable"
-
-elf_read_kernel_to_memory_unsupported_offset_msg:
-	.asciz "ELF: unsupported offset (only 32 bit offsets supported)"
-elf_read_kernel_to_memory_not_loadable_header_msg:
-	.asciz "ELF: kernel contains non-loadable program header"
-
-.section .bss
-
-elf_file_header:
-	.skip 64
-
-elf_file_header_phentsize:
-	.skip 2
-elf_file_header_phnum:
-	.skip 2
-elf_file_header_phoff:
-	.skip 4 # NOTE: only 32 bit offsets are supported
-
-elf_program_header:
-	.skip 56

bootloader/bios/ext2.S

@@ -1,749 +0,0 @@
-# FIXME: don't assume 512 byte sectors
-.set SECTOR_SHIFT,	9
-.set SECTOR_SIZE,	1 << SECTOR_SHIFT
-
-.set EXT2_MAX_BLOCK_SIZE,	4096
-.set EXT2_SUPERBLOCK_SIZE,	264
-.set EXT2_BGD_SHIFT,		5
-.set EXT2_BGD_SIZE,			1 << EXT2_BGD_SHIFT
-.set EXT2_INODE_SIZE_MAX,	256
-.set EXT2_ROOT_INO,			2
-.set EXT2_GOOD_OLD_REV,		0
-
-# inode types
-.set EXT2_S_IMASK,			0xF000
-.set EXT2_S_IFDIR,			0x4000
-.set EXT2_S_IFREG,			0x8000
-
-# superblock offsets
-.set s_first_data_block,	20
-.set s_log_block_size,		24
-.set s_inodes_per_group,	40
-.set s_magic,				56
-.set s_rev_level,			76
-.set s_inode_size,			88
-
-# block group descriptor offsets
-.set bg_inode_table,		8
-
-# inode offsets
-.set i_mode,				0
-.set i_size,				4
-.set i_block,				40
-
-
-.code16
-.section .stage2
-
-# checks whether partition contains ext2 filesystem.
-# fills ext2_superblock_buffer
-#	dl:		drive number
-#	ecx:	sector count
-#	bx:eax:	first sector
-# return:
-#	al: 1 if is ext2, 0 otherwise
-#	si: error message on error
-.global has_ext2_filesystem
-has_ext2_filesystem:
-	pushl %ecx
-	pushw %bx
-	pushw %di
-
-	# fill ext2_partition_first_sector
-	movw $0,   (ext2_partition_first_sector + 6)
-	movw %bx,  (ext2_partition_first_sector + 4)
-	movl %eax, (ext2_partition_first_sector + 0)
-
-	# fill ext2_drive_number
-	movb %dl, (ext2_drive_number)
-
-	cmpl $3, %ecx
-	jb .has_ext2_filesystem_does_not_fit
-
-	# one sector
-	movw $1, %cx
-
-	# from byte offset 1024
-	addl $(1024 / SECTOR_SIZE), %eax
-	adcw $0, %bx
-
-	# into sector buffer
-	movw $ext2_block_buffer, %di
-
-	call read_from_disk
-
-	# copy superblock to its buffer
-	movw $ext2_block_buffer, %si
-	movw $ext2_superblock_buffer, %di
-	movw $EXT2_SUPERBLOCK_SIZE, %cx
-	rep movsb
-
-	# verify magic
-	cmpw $0xEF53, (ext2_superblock_buffer + s_magic)
-	jne .has_ext2_filesystem_invalid_magic
-
-	# verify block size
-	  # verify shift fits in one byte
-	movl (ext2_superblock_buffer + s_log_block_size), %ecx
-	testl $0xFFFFFF00, %ecx
-	jnz .has_ext2_filesystem_unsupported_block_size
-	  # verify 1024 << s_log_block_size <= EXT2_MAX_BLOCK_SIZE
-	movl $1024, %eax
-	shll %cl, %eax
-	cmpl $EXT2_MAX_BLOCK_SIZE, %eax
-	ja .has_ext2_filesystem_unsupported_block_size
-
-	# fill block size and shift
-	movl %eax, (ext2_block_size)
-	addl $10, %ecx
-	movl %ecx, (ext2_block_shift)
-
-	# fill inode size
-	movl $128, %eax
-	cmpl $EXT2_GOOD_OLD_REV, (ext2_superblock_buffer + s_rev_level)
-	cmovnel (ext2_superblock_buffer + s_inode_size), %eax
-	movl %eax, (ext2_inode_size)
-
-	movb $1, %al
-	jmp .has_ext2_filesystem_done
-
- .has_ext2_filesystem_does_not_fit:
-	movw $root_partition_does_not_fit_ext2_filesystem_msg, %si
-	movb $0, %al
-	jmp .has_ext2_filesystem_done
-
- .has_ext2_filesystem_invalid_magic:
-	movw $root_partition_has_invalid_ext2_magic_msg, %si
-	movb $0, %al
-	jmp .has_ext2_filesystem_done
-
- .has_ext2_filesystem_unsupported_block_size:
-	movw $root_partition_has_unsupported_ext2_block_size_msg, %si
-	movb $0, %al
-	jmp .has_ext2_filesystem_done
-
- .has_ext2_filesystem_done:
-	popw %di
-	popw %bx
-	popl %ecx
-	ret
-
-
-# reads block in to ext2_block_buffer
-#	eax:	block number
-ext2_read_block:
-	pushal
-
-	# ecx := sectors_per_block := block_size / sector_size
-	movl (ext2_block_size), %ecx
-	shrl $SECTOR_SHIFT, %ecx
-
-	# ebx:eax := block * sectors_per_block + (ext2_partition_first_sector)
-	xorl %ebx, %ebx
-	mull %ecx
-	addl (ext2_partition_first_sector + 0), %eax
-	adcl (ext2_partition_first_sector + 4), %ebx
-
-	movw $ext2_block_buffer, %di
-	movb (ext2_drive_number), %dl
-	call read_from_disk
-
-	popal
-	ret
-
-
-# reads block group descrtiptor into ext2_block_group_descriptor
-#	eax:	block group
-ext2_read_block_group_descriptor:
-	pushal
-
-	# ebx := bgd_block_byte_offset := (s_first_data_block + 1) * block_size
-	#                              := (s_first_data_block + 1) << ext2_block_shift
-	movl (ext2_superblock_buffer + s_first_data_block), %ebx
-	incl %ebx
-	movb (ext2_block_shift), %cl
-	shll %cl, %ebx
-
-	# eax := bgd_byte_offset := bgd_block_byte_offset + EXT2_BGD_SIZE * block_group;
-	#                        := bgd_block_byte_offset + (block_group << EXT2_BGD_SHIFT)
-	movb $EXT2_BGD_SHIFT, %cl
-	shll %cl, %eax
-	addl %ebx, %eax
-
-	# eax: bgd_block  := bgd_byte_offset / block_size
-	# ebx: bgd_offset := bgd_byte_offset % block_size
-	xorl %edx, %edx
-	divl (ext2_block_size)
-	movl %edx, %ebx
-
-	call ext2_read_block
-
-	# esi := &ext2_block_buffer + bgd_offset := ebx + &ext2_block_buffer
-	# edi := &ext2_block_group_descriptor_buffer
-	movl %ebx, %esi
-	addl $ext2_block_buffer, %esi
-	movl $ext2_block_group_descriptor_buffer, %edi
-	movw $EXT2_BGD_SIZE, %cx
-	rep movsb
-
-	popal
-	ret
-
-
-# reads inode into ext2_inode_buffer
-#	eax:	ino
-ext2_read_inode:
-	pushal
-
-	# eax := block_group = (ino - 1) / s_inodes_per_group
-	# ebx := inode_index = (ino - 1) % s_inodes_per_group
-	xorl %edx, %edx
-	decl %eax
-	divl (ext2_superblock_buffer + s_inodes_per_group)
-	movl %edx, %ebx
-
-	call ext2_read_block_group_descriptor
-
-	# eax := inode_table_block  := (inode_index * inode_size) / block_size
-	# ebx := inode_table_offset := (inode_index * inode_size) % block_size
-	movl %ebx, %eax
-	mull (ext2_inode_size)
-	divl (ext2_block_size)
-	movl %edx, %ebx
-
-	# eax := filesystem_block := eax + bg_inode_table
-	addl (ext2_block_group_descriptor_buffer + bg_inode_table), %eax
-
-	movb (ext2_drive_number), %dl
-	call ext2_read_block
-
-	# copy inode memory
-	  # esi := inode_table_offset + ext2_block_buffer := edx + ext2_block_buffer
-	movl %ebx, %esi
-	addl $ext2_block_buffer, %esi
-	  # edi := ext2_inode_buffer
-	movl $ext2_inode_buffer, %edi
-	  # ecx := inode_size
-	movl (ext2_inode_size), %ecx
-	rep movsb
-
-	# reset indirect cache to zero
-	movl $0, (ext2_inode_indirect_number)
-
- .ext2_read_inode_done:
-	popal
-	ret
-
-
-# gets block index from n'th data block in inode stored in ext2_inode_buffer
-#	eax:	data block index
-# return:
-#	eax:	block index
-ext2_data_block_index:
-	pushl %ebx
-	pushl %ecx
-	pushl %edx
-	pushl %esi
-	pushl %edi
-
-	# ebx := max_data_blocks := (file_size + block_size - 1) / block_size
-	#                        := (i_size + ext2_block_size - 1) >> ext2_block_shift
-	# cl  := ext2_block_shift
-	movl (ext2_inode_buffer + i_size), %ebx
-	addl (ext2_block_size), %ebx
-	decl %ebx
-	movb (ext2_block_shift), %cl
-	shrl %cl, %ebx
-
-	# verify data block is within bounds
-	cmpl %ebx, %eax
-	jae .ext2_data_block_index_out_of_bounds
-
-	# check if this is direct block access
-	cmpl $12, %eax
-	jb .ext2_data_block_index_direct
-	subl $12, %eax
-
-	# cl  := indices_per_block_shift := ext2_block_shift - 2
-	# ebx := comp
-	subb $2, %cl
-	movl $1, %ebx
-	shll %cl, %ebx
-
-	# check if this is singly indirect block access
-	cmpl %ebx, %eax
-	jb .ext2_data_block_index_singly_indirect
-	subl %ebx, %eax
-	shll %cl, %ebx
-
-	# check if this is doubly indirect block access
-	cmpl %ebx, %eax
-	jb .ext2_data_block_index_doubly_indirect
-	subl %ebx, %eax
-	shll %cl, %ebx
-
-	# check if this is triply indirect block access
-	cmpl %ebx, %eax
-	jb .ext2_data_block_index_triply_indirect
-
-	# otherwise this is invalid access
-	jmp .ext2_data_block_index_invalid
-
- .ext2_data_block_index_direct:
-	movl $(ext2_inode_buffer + i_block), %esi
-	movl (%esi, %eax, 4), %eax
-	jmp .ext2_data_block_index_done
-
- .ext2_data_block_index_singly_indirect:
-	movl %eax, %ebx
-	movl (ext2_inode_buffer + i_block + 12 * 4), %eax
-	movw $1, %cx
-	jmp .ext2_data_block_index_indirect
-
- .ext2_data_block_index_doubly_indirect:
-	movl %eax, %ebx
-	movl (ext2_inode_buffer + i_block + 13 * 4), %eax
-	movw $2, %cx
-	jmp .ext2_data_block_index_indirect
-
- .ext2_data_block_index_triply_indirect:
-	movl %eax, %ebx
-	movl (ext2_inode_buffer + i_block + 14 * 4), %eax
-	movw $3, %cx
-	jmp .ext2_data_block_index_indirect
-
-	# eax := current block
-	# ebx := index
-	# cx  := depth
- .ext2_data_block_index_indirect:
-	# edx := cache index := (index & ~(block_size / 4 - 1)) | depth
-	#                    := (index & -(block_size >> 2)) | depth
-	movl (ext2_block_size), %edx
-	shrl $2, %edx
-	negl %edx
-	andl %ebx, %edx
-	orw %cx, %dx
-
-	# check whether this block is already cached
-	cmpl $0, (ext2_inode_indirect_number)
-	je .ext2_data_block_index_indirect_no_cache
-	cmpl %edx, (ext2_inode_indirect_number)
-	je .ext2_data_block_index_indirect_cached
-
- .ext2_data_block_index_indirect_no_cache:
-	# update cache block number, will be cached when found
-	movl %edx, (ext2_inode_indirect_number)
-
-	# eax := current block
-	# ebx := index
-	# cx  := depth
- .ext2_data_block_index_indirect_loop:
-	call ext2_read_block
-
-	# store depth and index
-	pushw %cx
-	pushl %ebx
-
-	cmpw $1, %cx
-	jbe .ext2_data_block_index_no_shift
-
-	# cl := shift
-	movb (ext2_block_shift), %al
-	subb $2, %al
-	decb %cl
-	mulb %cl
-	movb %al, %cl
-
-	# ebx := ebx >> shift
-	shrl %cl, %ebx
-
- .ext2_data_block_index_no_shift:
-	# edx := index of next block (ebx & (block_size / 4 - 1))
-	movl (ext2_block_size), %edx
-	shrl $2, %edx
-	decl %edx
-	andl %ebx, %edx
-
-	# eax := next block
-	movl $ext2_block_buffer, %esi
-	movl (%esi, %edx, 4), %eax
-
-	# restore depth and index
-	popl %ebx
-	popw %cx
-
-	loop .ext2_data_block_index_indirect_loop
-
-	# cache last read block
-	movw $ext2_block_buffer, %si
-	movw $ext2_inode_indirect_buffer, %di
-	movw (ext2_block_size), %cx
-	rep movsb
-
-	jmp .ext2_data_block_index_done
-
- .ext2_data_block_index_out_of_bounds:
-	movw $ext2_data_block_index_out_of_bounds_msg, %si
-	call puts; call print_newline
-	movl $0, %eax
-	jmp .ext2_data_block_index_done
-
- .ext2_data_block_index_invalid:
-	movw $ext2_data_block_index_invalid_msg, %si
-	call puts; call print_newline
-	movl $0, %eax
-	jmp .ext2_data_block_index_done
-
- .ext2_data_block_index_indirect_cached:
-	movl $ext2_inode_indirect_buffer, %esi
-	movl (ext2_block_size), %edx
-	shrl $2, %edx
-	decl %edx
-	andl %edx, %ebx
-	movl (%esi, %ebx, 4), %eax
-
- .ext2_data_block_index_done:
-	popl %edi
-	popl %esi
-	popl %edx
-	popl %ecx
-	popl %ebx
-	ret
-
-
-# read bytes from inode (implements read callback)
-#	eax: first byte
-#	ecx: byte count
-#	edi: buffer
-# returns only on success
-.global ext2_inode_read_bytes
-ext2_inode_read_bytes:
-	pushal
-
-	pushl %ebp
-	movl %esp, %ebp
-	subl $8, %esp
-
-	# save read info
-	movl %eax, 0(%esp)
-	movl %ecx, 4(%esp)
-
-	# eax := first_byte / block_size
-	# edx := first_byte % block_size
-	# when edx == 0, no partial read needed
-	xorl %edx, %edx
-	divl (ext2_block_size)
-	testl %edx, %edx
-	jz .ext2_inode_read_bytes_no_partial_start
-
-	# get data block index and read block
-	call ext2_data_block_index
-	call ext2_read_block
-
-	# ecx := byte count (min(block_size - edx, remaining_bytes))
-	movl (ext2_block_size), %ecx
-	subl %edx, %ecx
-	cmpl %ecx, 4(%esp)
-	cmovbl 4(%esp), %ecx
-
-	# update remaining read info
-	addl %ecx, 0(%esp)
-	subl %ecx, 4(%esp)
-
-	# esi := start sector data (block_buffer + index * SECTOR_SIZE)
-	movl $ext2_block_buffer, %esi
-	addl %edx, %esi
-
-	call memcpy32
-
-	# check if all sectors are read
-	cmpl $0, 4(%esp)
-	je .ext2_inode_read_bytes_done
-
- .ext2_inode_read_bytes_no_partial_start:
-	# eax := data block index (byte_start / block_size)
-	movl 0(%esp), %eax
-	movb (ext2_block_shift), %cl
-	shrl %cl, %eax
-
-	# get data block index and read block
-	call ext2_data_block_index
-	call ext2_read_block
-
-	# calculate bytes to copy (min(block_size, remaining_bytes))
-	movl (ext2_block_size), %ecx
-	cmpl %ecx, 4(%esp)
-	cmovbl 4(%esp), %ecx
-
-	# update remaining read info
-	addl %ecx, 0(%esp)
-	subl %ecx, 4(%esp)
-
-	movl $ext2_block_buffer, %esi
-	call memcpy32
-
-	# read next block if more sectors remaining
-	cmpl $0, 4(%esp)
-	jnz .ext2_inode_read_bytes_no_partial_start
-
- .ext2_inode_read_bytes_done:
-	leavel
-	popal
-	ret
-
-
-# find inode in inside directory inode stored in ext2_inode_buffer
-# store the found inode in ext2_inode_buffer
-#	si:		name string
-#	cx:		name length
-# return:
-#	eax:	ino if inode was found, 0 otherwise
-ext2_directory_find_inode:
-	pushl %ebx
-	pushw %cx
-	pushw %dx
-	pushw %si
-	pushw %di
-
-	pushl %ebp
-	movl %esp, %ebp
-	subl $8, %esp
-
-	# 0(%esp) := name length
-	movw %cx, 0(%esp)
-
-	# 2(%esp) := name string
-	movw %si, 2(%esp)
-
-	# verify that the name is <= 0xFF bytes
-	cmpw $0xFF, %cx
-	ja .ext2_directory_find_inode_not_found
-
-	# ebx := max data blocks: ceil(i_size / block_size)
-	movl (ext2_inode_buffer + i_size), %ebx
-	addl (ext2_block_size), %ebx
-	decl %ebx
-	movb (ext2_block_shift), %cl
-	shrl %cl, %ebx
-	jz .ext2_directory_find_inode_not_found
-
-	# 4(%esp) := current block
-	movl $0, 4(%esp)
-
- .ext2_directory_find_inode_block_read_loop:
-	# get next block index
-	movl 4(%esp), %eax
-	call ext2_data_block_index
-	test %eax, %eax
-	jz .ext2_directory_find_inode_next_block
-
-	# read current block
-	call ext2_read_block
-
-	# dx := current entry pointer
-	movw $ext2_block_buffer, %si
-
- .ext2_directory_find_inode_loop_entries:
-	# temporarily store entry pointer in dx
-	movw %si, %dx
-
-	# check if name length matches
-	# cx := name length
-	movw 0(%esp), %cx
-	cmpb 6(%si), %cl
-	jne .ext2_directory_find_inode_next_entry
-
-	# si := entry name
-	addw $8, %si
-
-	# di := asked name
-	movw 2(%esp), %di
-
-	# check if name matches
-	call memcmp
-	test %al, %al
-	# NOTE: dx contains entry pointer
-	jnz .ext2_directory_find_inode_found
-
- .ext2_directory_find_inode_next_entry:
-	# restore si
-	movw %dx, %si
-
-	# go to next entry if this block contains one
-	addw 4(%si), %si
-	movw $ext2_block_buffer, %di
-	addw (ext2_block_size), %di
-	cmpw %di, %si
-	jb .ext2_directory_find_inode_loop_entries
-
- .ext2_directory_find_inode_next_block:
-	incl 4(%esp)
-	cmpl %ebx, 4(%esp)
-	jb .ext2_directory_find_inode_block_read_loop
-
- .ext2_directory_find_inode_not_found:
-	xorb %al, %al
-	jmp .ext2_directory_find_inode_done
-
- .ext2_directory_find_inode_found:
-	# extract ino and read it to ext2_inode_buffer
-	movw %dx, %si
-	movl 0(%si), %eax
-	call ext2_read_inode
-
- .ext2_directory_find_inode_done:
-	leavel
-	popw %di
-	popw %si
-	popw %dx
-	popw %cx
-	popl %ebx
-	ret
-
-
-# search for kernel file from filesystem
-# returns only on success
-.global ext2_find_kernel
-ext2_find_kernel:
-	pushl %eax
-	pushw %cx
-	pushw %di
-	pushw %si
-
-	movl $EXT2_ROOT_INO, %eax
-	call ext2_read_inode
-
-	movw $kernel_path, %di
- .ext2_find_kernel_loop:
-	movw (%di), %si
-
-	# check if this list is done
-	testw %si, %si
-	jz .ext2_find_kernel_loop_done
-
-	# check that current part is directory
-	movw (ext2_inode_buffer + i_mode), %ax
-	andw $EXT2_S_IMASK, %ax
-	cmpw $EXT2_S_IFDIR, %ax
-	jne .ext2_find_kernel_part_not_dir
-
-	# prepare registers for directory finding
-	movw 0(%si), %cx
-	addw $2, %si
-
-	# print search path
-	pushw %si
-	movw $ext2_looking_for_msg, %si
-	call puts
-	popw %si
-	call puts; call print_newline
-
-	# search current directory for this file
-	call ext2_directory_find_inode
-	testl %eax, %eax
-	jz .ext2_find_kernel_part_not_found
-
-	# loop to next part
-	addw $2, %di
-	jmp .ext2_find_kernel_loop
-
- .ext2_find_kernel_loop_done:
-
-	# check that kernel is a regular file
-	movw (ext2_inode_buffer + i_mode), %ax
-	andw $EXT2_S_IMASK, %ax
-	cmpw $EXT2_S_IFREG, %ax
-	jne .ext2_find_kernel_not_reg
-
-	movw $ext2_kernel_found_msg, %si
-	call puts; call print_newline
-
-	popw %si
-	popw %di
-	popw %cx
-	popl %eax
-	ret
-
- .ext2_find_kernel_part_not_dir:
-	movw $ext2_part_not_dir_msg, %si
-	jmp print_and_halt
-
- .ext2_find_kernel_part_not_found:
-	movw $ext2_part_not_found_msg, %si
-	jmp print_and_halt
-
- .ext2_find_kernel_not_reg:
-	movw $ext2_kernel_not_reg_msg, %si
-	jmp print_and_halt
-
-.section .data
-
-kernel_path:
-	.short kernel_path1
-	.short kernel_path2
-	.short 0
-kernel_path1:
-	.short 4
-	.asciz "boot"
-kernel_path2:
-	.short 15
-	.asciz "banan-os.kernel"
-
-root_partition_does_not_fit_ext2_filesystem_msg:
-	.asciz "Root partition is too small to contain ext2 filesystem"
-root_partition_has_invalid_ext2_magic_msg:
-	.asciz "Root partition doesn't contain ext2 magic number"
-root_partition_has_unsupported_ext2_block_size_msg:
-	.asciz "Root partition has unsupported ext2 block size (1 KiB, 2 KiB and 4 KiB are supported)"
-
-ext2_part_not_dir_msg:
-	.asciz "inode in root path is not directory"
-ext2_part_not_found_msg:
-	.asciz " not found"
-ext2_kernel_not_reg_msg:
-	.asciz "kernel is not a regular file"
-ext2_kernel_found_msg:
-	.asciz "kernel found!"
-
-ext2_data_block_index_out_of_bounds_msg:
-	.asciz "data block index out of bounds"
-ext2_data_block_index_invalid_msg:
-	.asciz "data block index is invalid"
-
-ext2_looking_for_msg:
-	.asciz "looking for "
-
-.section .bss
-
-.align SECTOR_SIZE
-ext2_block_buffer:
-	.skip EXT2_MAX_BLOCK_SIZE
-
-ext2_inode_indirect_buffer:
-	.skip EXT2_MAX_BLOCK_SIZE
-ext2_inode_indirect_number:
-	.skip 4
-
-ext2_partition_first_sector:
-	.skip 8
-
-ext2_drive_number:
-	.skip 1
-	.skip 3 # padding
-
-# NOTE: fits in 2 bytes
-ext2_inode_size:
-	.skip 4
-ext2_block_size:
-	.skip 4
-ext2_block_shift:
-	.skip 4
-
-ext2_superblock_buffer:
-	.skip EXT2_SUPERBLOCK_SIZE
-
-ext2_block_group_descriptor_buffer:
-	.skip EXT2_BGD_SIZE
-
-ext2_inode_buffer:
-	.skip EXT2_INODE_SIZE_MAX

bootloader/bios/framebuffer.S

@@ -1,218 +0,0 @@
-.code16
-.section .stage2
-
-# kernel framebuffer information format
-#	.align 8
-#	.long 0xBABAB007
-#	.long -(0xBABAB007 + width + height + bpp)
-#	.long width		(2 bytes used, 4 bytes for ease of calculation)
-#	.long height	(2 bytes used, 4 bytes for ease of calculation)
-#	.long bpp		(1 bytes used, 4 bytes for ease of calculation)
-
-# scan memory 0x100000 -> 0x200000 for framebuffer information
-# return:
-#	ax: target width
-#	bx: target height
-#	cx: target bpp
-vesa_scan_kernel_image:
-	pushl %edx
-	pushl %esi
-
-	movl $0x100000, %esi
-
- .vesa_scan_kernel_image_loop:
-	# check magic
-	cmpl $0xBABAB007, (%esi)
-	jne .vesa_scan_kernel_image_next_addr
-
-	# check checksum
-	movl 0x00(%esi), %edx
-	addl 0x04(%esi), %edx
-	addl 0x08(%esi), %edx
-	addl 0x0C(%esi), %edx
-	addl 0x10(%esi), %edx
-	testl %edx, %edx
-	jnz .vesa_scan_kernel_image_next_addr
-
-	# set return registers
-	movw 0x08(%esi), %ax
-	movw 0x0C(%esi), %bx
-	movw 0x10(%esi), %cx
-	jmp .vesa_scan_kernel_image_done
-
- .vesa_scan_kernel_image_next_addr:
-	addl $8, %esi
-	cmpl $0x200000, %esi
-	jb .vesa_scan_kernel_image_loop
-
-	# zero out return registers
-	xorw %ax, %ax
-	xorw %bx, %bx
-	xorw %cx, %cx
-
- .vesa_scan_kernel_image_done:
-	popl %esi
-	popl %edx
-	ret
-
-# Find suitable video mode and save it in (vesa_target_mode)
-vesa_find_video_mode:
-	pushal
-
-	pushl %ebp
-	movl %esp, %ebp
-	subl $6, %esp
-
-	# clear target mode and frame buffer
-	movw $0, (vesa_target_mode)
-	movl $0, (framebuffer + 0)
-	movl $0, (framebuffer + 4)
-	movl $0, (framebuffer + 8)
-	movl $0, (framebuffer + 12)
-	movw $0, (framebuffer + 16)
-
-	call vesa_scan_kernel_image
-	testw %ax, %ax
-	jz .vesa_find_video_mode_loop_modes_done
-
-	# save arguments in stack
-	movw %ax, -2(%ebp)
-	movw %bx, -4(%ebp)
-	movw %cx, -6(%ebp)
-
-	# get vesa information
-	movw $0x4F00, %ax
-	movw $vesa_info_buffer, %di
-	pushl %ebp; int $0x10; popl %ebp	# BOCHS doesn't seem to reserve ebp
-	cmpb $0x4F, %al; jne .vesa_unsupported
-	cmpb $0x00, %ah; jne .vesa_error
-
-	# confirm that response starts with 'VESA'
-	cmpl $0x41534556, (vesa_info_buffer)
-	jne .vesa_error
-
-	# confirm that version is atleast 2.0
-	cmpw $0x0200, (vesa_info_buffer + 0x04)
-	jb .vesa_unsupported_version
-
-	movl (vesa_info_buffer + 0x0E), %esi
- .vesa_find_video_mode_loop_modes:
-	cmpw $0xFFFF, (%esi)
-	je .vesa_find_video_mode_loop_modes_done
-
-	# get info of next mode
-	movw $0x4F01, %ax
-	movw (%esi), %cx
-	movw $vesa_mode_info_buffer, %di
-	pushl %ebp; int $0x10; popl %ebp	# BOCHS doesn't seem to reserve ebp
-	cmpb $0x4F, %al; jne .vesa_unsupported
-	cmpb $0x00, %ah; jne .vesa_error
-
-	# check whether in graphics mode
-	testb $0x10, (vesa_mode_info_buffer + 0)
-	jz .vesa_find_video_mode_next_mode
-
-	# compare mode's dimensions
-	movw -2(%ebp), %ax; cmpw %ax, (vesa_mode_info_buffer + 0x12)
-	jne .vesa_find_video_mode_next_mode
-	movw -4(%ebp), %ax; cmpw %ax, (vesa_mode_info_buffer + 0x14)
-	jne .vesa_find_video_mode_next_mode
-	movb -6(%ebp), %al; cmpb %al, (vesa_mode_info_buffer + 0x19)
-	jne .vesa_find_video_mode_next_mode
-
-	# set address, pitch, type
-	movl (vesa_mode_info_buffer + 0x28), %esi
-	movl %esi, (framebuffer + 0)
-	movw (vesa_mode_info_buffer + 0x10), %ax
-	movw %ax,  (framebuffer + 4)
-	movb $1,   (framebuffer + 17)
-
-	# set width, height, bpp
-	movw -2(%ebp), %ax; movw %ax, (framebuffer +  8)
-	movw -4(%ebp), %ax; movw %ax, (framebuffer + 12)
-	movw -6(%ebp), %ax; movb %al, (framebuffer + 16)
-
-	movw %cx, (vesa_target_mode)
-	jmp .vesa_find_video_mode_loop_modes_done
-
- .vesa_find_video_mode_next_mode:
-	addl $2, %esi
-	jmp .vesa_find_video_mode_loop_modes
-
- .vesa_find_video_mode_loop_modes_done:
-	leavel
-	popal
-	ret
-
- .vesa_unsupported:
-	movw $vesa_unsupported_msg, %si
-	jmp print_and_halt
- .vesa_unsupported_version:
-	movw $vesa_unsupported_version_msg, %si
-	jmp print_and_halt
- .vesa_error:
-	movw $vesa_error_msg, %si
-	jmp print_and_halt
-
-
-# scan for video mode in kernel memory and set the correct one.
-# when video mode is not found or does not exists,
-# set it to 80x25 text mode to clear the screen.
-.global vesa_set_video_mode
-vesa_set_video_mode:
-	pushw %ax
-	pushw %bx
-
-	call vesa_find_video_mode
-
-	movw (vesa_target_mode), %bx
-	testw %bx, %bx
-	jz .vesa_set_target_mode_generic
-
-	movw $0x4F02, %ax
-	orw $0x4000, %bx
-	pushl %ebp; int $0x10; popl %ebp	# BOCHS doesn't seem to reserve ebp
-
-	jmp .set_video_done
-
- .vesa_set_target_mode_generic:
-	movb $0x03, %al
-	movb $0x00, %ah
-	pushl %ebp; int $0x10; popl %ebp	# BOCHS doesn't seem to reserve ebp
-
- .set_video_done:
-	popw %bx
-	popw %ax
-	ret
-
-.section .data
-
-vesa_error_msg:
-	.asciz "VESA error"
-vesa_unsupported_msg:
-	.asciz "VESA unsupported"
-vesa_unsupported_version_msg:
-	.asciz "VESA unsupported version"
-vesa_success_msg:
-	.asciz "VESA success"
-
-.section .bss
-
-vesa_info_buffer:
-	.skip 512
-
-vesa_mode_info_buffer:
-	.skip 256
-
-vesa_target_mode:
-	.skip 2
-
-.global framebuffer
-.align 8
-framebuffer:
-	.skip 4	# address
-	.skip 4	# pitch
-	.skip 4	# width
-	.skip 4 # height
-	.skip 1 # bpp
-	.skip 1 # type

bootloader/bios/linker.ld

@@ -1,17 +0,0 @@
-ENTRY(stage1_main)
-
-SECTIONS
-{
-	. = 0x7C00;
-	.stage1 : { *(.stage1) }
-
-	. = ALIGN(512);
-	stage2_start = .;
-	.stage2 : { *(.stage2) }
-	. = ALIGN(512);
-	.data : { *(.data) }
-	stage2_end = .;
-
-	. = ALIGN(512);
-	.bss : { *(.bss) }
-}

bootloader/bios/memory_map.S

@@ -1,132 +0,0 @@
-.code16
-
-.section .stage2
-
-# fills memory map data structure
-# doesn't return on error
-# NO REGISTERS SAVED
-.global get_memory_map
-get_memory_map:
-	movl $0, (memory_map_entry_count)
-
-	movl $0x0000E820, %eax
-	movl $0x534D4150, %edx
-	xorl %ebx, %ebx
-	movl $20, %ecx
-	movw $memory_map_entries, %di
-
-	clc
-	int $0x15
-	# If first call returs with CF set, the call failed
-	jc .get_memory_map_error
-
- .get_memory_map_rest:
-	cmpl $0x534D4150, %eax
-	jne .get_memory_map_error
-
-	# FIXME: don't assume BIOS to always return 20 bytes
-	cmpl $20, %ecx
-	jne .get_memory_map_error
-
-	# increment entry count
-	incl (memory_map_entry_count)
-
-	# increment entry pointer
-	addw %cx, %di
-
-	# BIOS can indicate end of list by 0 in ebx
-	testl %ebx, %ebx
-	jz .get_memory_map_done
-
-	movl $0x0000E820, %eax
-	movl $0x534D4150, %edx
-
-	clc
-	int $0x15
-	# BIOS can indicate end of list by setting CF
-	jnc .get_memory_map_rest
-
- .get_memory_map_done:
-	ret
-
- .get_memory_map_error:
-	movw $memory_map_error_msg, %si
-	jmp print_and_halt
-
-
-# print memory map from memory_map_entries
-# NO REGISTERS SAVED
-.global print_memory_map
-print_memory_map:
-	movw $memory_map_msg, %si
-	call puts
-	call print_newline
-
-	movl (memory_map_entry_count), %edx
-	movw $memory_map_entries, %si
-
-	movw $16, %bx
-	movw $4, %cx
-
- .loop_memory_map:
-	movb $' ', %al
-	call putc; call putc; call putc; call putc
-
-	movw 0x06(%si), %ax
-	call print_number
-	movw 0x04(%si), %ax
-	call print_number
-	movw 0x02(%si), %ax
-	call print_number
-	movw 0x00(%si), %ax
-	call print_number
-
-	movb $',', %al
-	call putc
-	movb $' ', %al
-	call putc
-
-	movw 0x0E(%si), %ax
-	call print_number
-	movw 0x0C(%si), %ax
-	call print_number
-	movw 0x0A(%si), %ax
-	call print_number
-	movw 0x08(%si), %ax
-	call print_number
-
-	movb $',', %al
-	call putc
-	movb $' ', %al
-	call putc
-
-	movw 0x12(%si), %ax
-	call print_number
-	movw 0x10(%si), %ax
-	call print_number
-
-	call print_newline
-
-	addw $20, %si
-
-	decl %edx
-	jnz .loop_memory_map
-
-	ret
-
-.section .data
-
-memory_map_msg:
-	.asciz "memmap:"
-memory_map_error_msg:
-	.asciz "Failed to get memory map"
-
-.section .bss
-
-.global memory_map
-memory_map:
-memory_map_entry_count:
-	.skip 4
-# 100 entries should be enough...
-memory_map_entries:
-	.skip 20 * 100

bootloader/bios/utils.S

@@ -1,385 +0,0 @@
-.include "common.S"
-
-.set SCREEN_WIDTH,	80
-.set SCREEN_HEIGHT,	25
-
-.code16
-
-.section .stage1
-
-# prints character to screen
-# al:		ascii character to print
-.global putc
-putc:
-	pushw %ax
-	pushw %bx
-	movb $0x0E, %ah
-	xorb %bh, %bh
-	int $0x10
-	popw %bx
-	popw %ax
-	ret
-
-# prints null terminated string to screen
-# ds:si:	string address
-.global puts
-puts:
-	pushw %si
-	pushw %bx
-	pushw %ax
-
-	movb $0x0E, %ah
-	xorb %bh, %bh
-
- .puts_loop:
-	lodsb
-
-	test %al, %al
-	jz .puts_done
-
-	int $0x10
-	jmp .puts_loop
-
- .puts_done:
-	popw %ax
-	popw %bx
-	popw %si
-	ret
-
-# compares memory between addresses
-# si:		ptr1
-# di:		ptr2
-# cx:		bytes count
-# return:
-#	al: 1 if equal, 0 otherwise
-.global memcmp
-memcmp:
-	# NOTE: using pusha + popa to save space
-	pusha
-	cld
-	repe cmpsb
-	popa
-	setzb %al
-	ret
-
-
-.section .stage2
-
-# read a character from keyboard
-# return:
-#	al: ascii
-#	ah: bios scan code
-.global getc
-getc:
-	movb $0x00, %ah
-	int $0x16
-	ret
-
-# prints newline to screen
-.global print_newline
-print_newline:
-	pushw %ax
-	movb $'\r', %al
-	call putc
-	movb $'\n', %al
-	call putc
-	pop %ax
-	ret
-
-# prints backspace to screen, can go back a line
-.global print_backspace
-print_backspace:
-	pushw %ax
-	pushw %bx
-	pushw %cx
-	pushw %dx
-
-	# get cursor position
-	movb $0x03, %ah
-	movb $0x00, %bh
-	int $0x10
-
-	# don't do anyting if on first row
-	testb %dh, %dh
-	jz .print_backspace_done
-
-	# go one line up if on first column
-	test %dl, %dl
-	jz .print_backspace_go_line_up
-
-	# otherwise decrease column
-	decb %dl
-	jmp .print_backspace_do_print
-
- .print_backspace_go_line_up:
-	# decrease row and set column to the last one
-	decb %dh
-	movb $(SCREEN_WIDTH - 1), %dl
-
- .print_backspace_do_print:
-	# set cursor position
-	movb $0x02, %ah
-	int $0x10
-
-	# print 'empty' character (space)
-	mov $' ', %al
-	call putc
-
-	# set cursor position
-	movb $0x02, %ah
-	int $0x10
-
- .print_backspace_done:
-	popw %dx
-	popw %cx
-	popw %bx
-	popw %ax
-	ret
-
-# print number to screen
-# ax:	number to print
-# bx:	number base
-# cx:	min width (zero pads if shorter)
-.global print_number
-print_number:
-	pusha
-	pushl %ebp
-	movl %esp, %ebp
-
-	# save min width
-	subl $4, %esp
-	movw %cx, (%esp)
-
-	movw $print_number_buffer, %si
-	xorw %cx, %cx
-
- .print_number_fill_loop:
-	# fill buffer with all remainders ax % bx
-	xorw %dx, %dx
-	divw %bx
-	movb %dl, (%si)
-	incw %si
-	incw %cx
-	testw %ax, %ax
-	jnz .print_number_fill_loop
-
-	# check if zero pad is required
-	cmpw (%esp), %cx
-	jae .print_number_print_loop
-
-	# dx: saved number count
-	# cx: zero pad count
-	movw %cx, %dx
-	movw (%esp), %cx
-	subw %dx, %cx
-	movb $'0', %al
-
- .print_number_pad_zeroes:
-	call putc
-	loop .print_number_pad_zeroes
-
-	# restore number count
-	movw %dx, %cx
-
- .print_number_print_loop:
-	decw %si
-	movb (%si), %al
-	cmpb $10, %al
-	jae .print_number_hex
-	addb $'0', %al
-	jmp .print_number_do_print
- .print_number_hex:
-	addb $('a' - 10), %al
- .print_number_do_print:
-	call putc
-	loop .print_number_print_loop
-
-	leavel
-	popa
-	ret
-
-# prints 8 bit hexadecimal number to screen
-#	al:		number to print
-.global print_hex8
-print_hex8:
-	pushw %ax
-	pushw %bx
-	pushw %cx
-
-	movw $16, %bx
-	movw $2,  %cx
-	andw $0xFF, %ax
-	call print_number
-
-	popw %cx
-	popw %bx
-	popw %ax
-	ret
-
-# prints 16 bit hexadecimal number to screen
-#	ax:		number to print
-.global print_hex16
-print_hex16:
-	pushw %bx
-	pushw %cx
-
-	movw $16, %bx
-	movw $4,  %cx
-	call print_number
-
-	popw %cx
-	popw %bx
-	ret
-
-# prints 32 bit hexadecimal number to screen
-#	eax:	number to print
-.global print_hex32
-print_hex32:
-	pushl %eax
-	pushw %dx
-
-	movw %ax, %dx
-
-	shrl $16, %eax;
-	call print_hex16
-
-	movw %dx, %ax
-	call print_hex16
-
-	popw %dx
-	popl %eax
-	ret
-
-# prints 64 bit hexadecimal number to screen
-#	edx:eax:	number to print
-.global print_hex64
-print_hex64:
-	xchgl %eax, %edx
-	call print_hex32
-	xchgl %eax, %edx
-	call print_hex32
-	ret
-
-# test if character is printable ascii
-#	al: character to test
-# return:
-#	al: 1 if is printable, 0 otherwise
-.global isprint
-isprint:
-	subb $0x20, %al
-	cmpb $(0x7E - 0x20), %al
-	ja .isprint_not_printable
-	movb $1, %al
-	ret
- .isprint_not_printable:
-	movb $0, %al
-	ret
-
-
-# memset with 32 bit registers
-#   edi:    destination address
-#   ecx:    bytes count
-#   al:     value to set
-# return:
-#   edi:    destination address + bytes count
-#   ecx:    0
-#   other:  preserved
-.global memset32
-memset32:
-	testl %ecx, %ecx
-	jz .memset32_done
-
-	pushf; cli
-	pushw %es
-	pushl %eax
-	pushl %ebx
-	pushl %edx
-
-	movl %cr0, %ebx
-	orb $1, %bl
-	movl %ebx, %cr0
-
-	ljmpl $GDT_CODE32, $.memset32_pmode32
-
- .code32
- .memset32_pmode32:
-	movw $GDT_DATA32, %dx
-	movw %dx, %es
-
-	rep stosb %es:(%edi)
-
-	ljmpl $GDT_CODE16, $.memset32_pmode16
-
- .code16
- .memset32_pmode16:
-	andb $0xFE, %bl
-	movl %ebx, %cr0
-	ljmpl $0x00, $.memset32_rmode16
-
- .memset32_rmode16:
-	popl %edx
-	popl %ebx
-	popl %eax
-	popw %es
-	popf
-
- .memset32_done:
-	ret
-
-# memcpy with 32 bit registers
-#   esi:    source address
-#   edi:    destination address
-#   ecx:    bytes count
-# return:
-#   esi:    source address + bytes count
-#   edi:    destination address + bytes count
-#   ecx:    0
-#   other:  preserved
-.global memcpy32
-memcpy32:
-	testl %ecx, %ecx
-	jz .memcpy32_done
-
-	pushf; cli
-	pushw %ds
-	pushw %es
-	pushl %ebx
-	pushl %edx
-
-	movl %cr0, %ebx
-	orb $1, %bl
-	movl %ebx, %cr0
-
-	ljmpl $GDT_CODE32, $.memcpy32_pmode32
-
- .code32
- .memcpy32_pmode32:
-	movw $GDT_DATA32, %dx
-	movw %dx, %ds
-	movw %dx, %es
-
-	rep movsb %ds:(%esi), %es:(%edi)
-
-	ljmpl $GDT_CODE16, $.memcpy32_pmode16
-
- .code16
- .memcpy32_pmode16:
-	andb $0xFE, %bl
-	movl %ebx, %cr0
-	ljmpl $0x00, $.memcpy32_rmode16
-
- .memcpy32_rmode16:
-	popl %edx
-	popl %ebx
-	popw %es
-	popw %ds
-	popf
-
- .memcpy32_done:
-	ret
-
-.section .bss
-
-# enough for base 2 printing
-print_number_buffer:
-	.skip 16

bootloader/installer/.gitignore

@@ -1 +0,0 @@
-build/

bootloader/installer/CMakeLists.txt

@@ -1,22 +0,0 @@
-cmake_minimum_required(VERSION 3.26)
-
-if (NOT DEFINED ENV{BANAN_ARCH})
-	message(FATAL_ERROR "environment variable BANAN_ARCH not defined")
-endif ()
-set(BANAN_ARCH $ENV{BANAN_ARCH})
-
-project(banan_os-bootloader-installer CXX)
-
-set(SOURCES
-    crc32.cpp
-    ELF.cpp
-    GPT.cpp
-    GUID.cpp
-	main.cpp
-)
-
-add_executable(banan_os-bootloader-installer ${SOURCES})
-target_compile_options(banan_os-bootloader-installer PRIVATE -O2 -std=c++20)
-target_compile_definitions(banan_os-bootloader-installer PRIVATE __arch=${BANAN_ARCH})
-target_include_directories(banan_os-bootloader-installer PRIVATE ${CMAKE_SOURCE_DIR}/../../userspace/libraries/LibELF/include)
-target_include_directories(banan_os-bootloader-installer PRIVATE ${CMAKE_SOURCE_DIR}/../../kernel/include)

bootloader/installer/ELF.cpp

@@ -1,142 +0,0 @@
-#include "ELF.h"
-
-#include <LibELF/Values.h>
-
-#include <cassert>
-#include <cerrno>
-#include <cstring>
-#include <fcntl.h>
-#include <iostream>
-#include <sys/mman.h>
-#include <unistd.h>
-
-using namespace LibELF;
-
-ELFFile::ELFFile(std::string_view path)
-	: m_path(path)
-{
-	m_fd = open(m_path.c_str(), O_RDONLY);
-	if (m_fd == -1)
-	{
-		std::cerr << "Could not open '" << m_path << "': " << std::strerror(errno) << std::endl;
-		return;
-	}
-
-	if (fstat(m_fd, &m_stat) == -1)
-	{
-		std::cerr << "Could not stat '" << m_path << "': " << std::strerror(errno) << std::endl;
-		return;
-	}
-
-	void* mmap_addr = mmap(nullptr, m_stat.st_size, PROT_READ, MAP_PRIVATE, m_fd, 0);
-	if (mmap_addr == MAP_FAILED)
-	{
-		std::cerr << "Could not mmap '" << m_path << "': " << std::strerror(errno) << std::endl;
-		return;
-	}
-	m_mmap = reinterpret_cast<uint8_t*>(mmap_addr);
-
-	if (!validate_elf_header())
-		return;
-
-	m_success = true;
-}
-
-ELFFile::~ELFFile()
-{
-	if (m_mmap)
-		munmap(m_mmap, m_stat.st_size);
-	m_mmap = nullptr;
-
-	if (m_fd != -1)
-		close(m_fd);
-	m_fd = -1;
-}
-
-const ElfNativeFileHeader& ELFFile::elf_header() const
-{
-	return *reinterpret_cast<LibELF::ElfNativeFileHeader*>(m_mmap);
-}
-
-bool ELFFile::validate_elf_header() const
-{
-	if (m_stat.st_size < sizeof(ElfNativeFileHeader))
-	{
-		std::cerr << m_path << " is too small to be a ELF executable" << std::endl;
-		return false;
-	}
-
-	const auto& elf_header = this->elf_header();
-
-	if (
-		elf_header.e_ident[EI_MAG0] != ELFMAG0 ||
-		elf_header.e_ident[EI_MAG1] != ELFMAG1 ||
-		elf_header.e_ident[EI_MAG2] != ELFMAG2 ||
-		elf_header.e_ident[EI_MAG3] != ELFMAG3
-	)
-	{
-		std::cerr << m_path << " doesn't have an ELF magic number" << std::endl;
-		return false;
-	}
-
-#if ARCH(x86_64)
-	if (elf_header.e_ident[EI_CLASS] != ELFCLASS64)
-#elif ARCH(i686)
-	if (elf_header.e_ident[EI_CLASS] != ELFCLASS32)
-#endif
-	{
-		std::cerr << m_path << " architecture doesn't match" << std::endl;
-		return false;
-	}
-
-	if (elf_header.e_ident[EI_DATA] != ELFDATA2LSB)
-	{
-		std::cerr << m_path << " is not in little endian format" << std::endl;
-		return false;
-	}
-
-	if (elf_header.e_ident[EI_VERSION] != EV_CURRENT)
-	{
-		std::cerr << m_path << " has unsupported version" << std::endl;
-		return false;
-	}
-
-	if (elf_header.e_type != ET_EXEC)
-	{
-		std::cerr << m_path << " is not an executable ELF file" << std::endl;
-		return false;
-	}
-
-	return true;
-}
-
-const ElfNativeSectionHeader& ELFFile::section_header(std::size_t index) const
-{
-	const auto& elf_header = this->elf_header();
-	assert(index < elf_header.e_shnum);
-	const uint8_t* section_array_start = m_mmap + elf_header.e_shoff;
-	return *reinterpret_cast<const ElfNativeSectionHeader*>(section_array_start + index * elf_header.e_shentsize);
-}
-
-std::string_view ELFFile::section_name(const ElfNativeSectionHeader& section_header) const
-{
-	const auto& elf_header = this->elf_header();
-	assert(elf_header.e_shstrndx != SHN_UNDEF);
-	const auto& section_string_table = this->section_header(elf_header.e_shstrndx);
-	const char* string_table_start = reinterpret_cast<const char*>(m_mmap + section_string_table.sh_offset);
-	return string_table_start + section_header.sh_name;
-}
-
-std::optional<std::span<const uint8_t>> ELFFile::find_section(std::string_view name) const
-{
-	const auto& elf_header = this->elf_header();
-	for (std::size_t i = 0; i < elf_header.e_shnum; i++)
-	{
-		const auto& section_header = this->section_header(i);
-		auto section_name = this->section_name(section_header);
-		if (section_name != name)
-			continue;
-		return std::span<const uint8_t>(m_mmap + section_header.sh_offset, section_header.sh_size);
-	}
-	return {};
-}

bootloader/installer/ELF.h

@@ -1,36 +0,0 @@
-#pragma once
-
-#include <LibELF/Types.h>
-
-#include <cstdint>
-#include <optional>
-#include <span>
-#include <string_view>
-#include <string>
-#include <sys/stat.h>
-
-class ELFFile
-{
-public:
-	ELFFile(std::string_view path);
-	~ELFFile();
-
-	const LibELF::ElfNativeFileHeader& elf_header() const;
-	std::optional<std::span<const uint8_t>> find_section(std::string_view name) const;
-
-	bool success() const { return m_success; }
-
-	std::string_view path() const { return m_path; }
-
-private:
-	const LibELF::ElfNativeSectionHeader& section_header(std::size_t index) const;
-	std::string_view section_name(const LibELF::ElfNativeSectionHeader&) const;
-	bool validate_elf_header() const;
-
-private:
-	const std::string	m_path;
-	bool				m_success	{ false };
-	int					m_fd		{ -1 };
-	struct stat			m_stat		{ };
-	uint8_t*			m_mmap		{ nullptr };
-};

bootloader/installer/GPT.cpp

@@ -1,250 +0,0 @@
-#include "crc32.h"
-#include "GPT.h"
-
-#include <cassert>
-#include <cerrno>
-#include <cstring>
-#include <fcntl.h>
-#include <iostream>
-#include <sys/mman.h>
-#include <unistd.h>
-
-// FIXME: don't assume 512 byte sectors
-#define SECTOR_SIZE 512
-
-GPTFile::GPTFile(std::string_view path)
-	: m_path(path)
-{
-	m_fd = open(m_path.c_str(), O_RDWR);
-	if (m_fd == -1)
-	{
-		std::cerr << "Could not open '" << m_path << "': " << std::strerror(errno) << std::endl;
-		return;
-	}
-
-	if (fstat(m_fd, &m_stat) == -1)
-	{
-		std::cerr << "Could not stat '" << m_path << "': " << std::strerror(errno) << std::endl;
-		return;
-	}
-
-	void* mmap_addr = mmap(nullptr, m_stat.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, m_fd, 0);
-	if (mmap_addr == MAP_FAILED)
-	{
-		std::cerr << "Could not mmap '" << m_path << "': " << std::strerror(errno) << std::endl;
-		return;
-	}
-	m_mmap = reinterpret_cast<uint8_t*>(mmap_addr);
-
-	if (!validate_gpt_header())
-		return;
-
-	m_success = true;
-}
-
-GPTFile::~GPTFile()
-{
-	if (m_mmap)
-		munmap(m_mmap, m_stat.st_size);
-	m_mmap = nullptr;
-
-	if (m_fd != -1)
-		close(m_fd);
-	m_fd = -1;
-}
-
-MBR& GPTFile::mbr()
-{
-	return *reinterpret_cast<MBR*>(m_mmap);
-}
-
-const GPTHeader& GPTFile::gpt_header() const
-{
-    return *reinterpret_cast<GPTHeader*>(m_mmap + SECTOR_SIZE);
-}
-
-bool GPTFile::install_stage1(std::span<const uint8_t> stage1)
-{
-	auto& mbr = this->mbr();
-
-	if (stage1.size() > sizeof(mbr.boot_code))
-	{
-		std::cerr << m_path << ": can't fit " << stage1.size() << " bytes of boot code in mbr (max is " << sizeof(mbr.boot_code) << ")" << std::endl;
-		return false;
-	}
-
-	// copy boot code
-	memcpy(mbr.boot_code, stage1.data(), stage1.size());
-
-	// setup mbr
-	mbr.unique_mbr_disk_signature = 0xdeadbeef;
-	mbr.unknown = 0;
-	mbr.signature = 0xAA55;
-
-	// setup mbr partition records
-	mbr.partition_records[0].boot_indicator = 0x00;
-	mbr.partition_records[0].starting_chs[0] = 0x00;
-	mbr.partition_records[0].starting_chs[1] = 0x02;
-	mbr.partition_records[0].starting_chs[2] = 0x00;
-	mbr.partition_records[0].os_type = 0xEE;
-	mbr.partition_records[0].ending_chs[0] = 0xFF;
-	mbr.partition_records[0].ending_chs[1] = 0xFF;
-	mbr.partition_records[0].ending_chs[2] = 0xFF;
-	mbr.partition_records[0].starting_lba = 1;
-	mbr.partition_records[0].size_in_lba = 0xFFFFFFFF;
-	memset(&mbr.partition_records[1], 0x00, sizeof(MBRPartitionRecord));
-	memset(&mbr.partition_records[2], 0x00, sizeof(MBRPartitionRecord));
-	memset(&mbr.partition_records[3], 0x00, sizeof(MBRPartitionRecord));
-
-	return true;
-}
-
-bool GPTFile::install_stage2(std::span<const uint8_t> stage2, std::span<const uint8_t> data, const GUID& root_partition_guid)
-{
-	if (data.size() < 16)
-	{
-		std::cerr << m_path << ": contains invalid .data section, too small for patches" << std::endl;
-		return false;
-	}
-
-	// find GUID patch offsets
-	std::size_t disk_guid_offset(-1);
-	std::size_t part_guid_offset(-1);
-	for (std::size_t i = 0; i < data.size() - 16; i++)
-	{
-		if (memcmp(data.data() + i, "root disk guid  ", 16) == 0)
-		{
-			if (disk_guid_offset != std::size_t(-1))
-			{
-				std::cerr << m_path << ": contains invalid .data section, multiple patchable disk guids" << std::endl;
-				return false;
-			}
-			disk_guid_offset = i;
-		}
-		if (memcmp(data.data() + i, "root part guid  ", 16) == 0)
-		{
-			if (part_guid_offset != std::size_t(-1))
-			{
-				std::cerr << m_path << ": contains invalid .data section, multiple patchable partition guids" << std::endl;
-				return false;
-			}
-			part_guid_offset = i;
-		}
-	}
-	if (disk_guid_offset == std::size_t(-1))
-	{
-		std::cerr << m_path << ": contains invalid .data section, no patchable disk guid" << std::endl;
-		return false;
-	}
-	if (part_guid_offset == std::size_t(-1))
-	{
-		std::cerr << m_path << ": contains invalid .data section, no patchable partition guid" << std::endl;
-		return false;
-	}
-
-	auto partition = find_partition_with_type(bios_boot_guid);
-	if (!partition.has_value())
-	{
-		std::cerr << m_path << ": could not find partition with type " << bios_boot_guid << std::endl;
-		return false;
-	}
-
-	const std::size_t partition_size = (partition->ending_lba - partition->starting_lba + 1) * SECTOR_SIZE;
-
-	std::size_t data_offset = stage2.size();
-	if (std::size_t rem = data_offset % 512)
-		data_offset += 512 - rem;
-
-	if (data_offset + data.size() > partition_size)
-	{
-		std::cerr << m_path << ": can't fit " << stage2.size() + data.size() << " bytes of data to partition of size " << partition_size << std::endl;
-		return false;
-	}
-
-	uint8_t* partition_start = m_mmap + partition->starting_lba * SECTOR_SIZE;
-	memcpy(partition_start, stage2.data(), stage2.size());
-	memcpy(partition_start + data_offset, data.data(), data.size());
-
-	// patch GUIDs
-	*reinterpret_cast<GUID*>(partition_start + data_offset + disk_guid_offset) = gpt_header().disk_guid;
-	*reinterpret_cast<GUID*>(partition_start + data_offset + part_guid_offset) = root_partition_guid;
-
-	return true;
-}
-
-bool GPTFile::install_bootloader(std::span<const uint8_t> stage1, std::span<const uint8_t> stage2, std::span<const uint8_t> data, const GUID& root_partition_guid)
-{
-	if (!find_partition_with_guid(root_partition_guid).has_value())
-	{
-		std::cerr << m_path << ": no partition with GUID " << root_partition_guid << std::endl;
-		return false;
-	}
-	if (!install_stage1(stage1))
-		return false;
-	if (!install_stage2(stage2, data, root_partition_guid))
-		return false;
-	return true;
-}
-
-std::optional<GPTPartitionEntry> GPTFile::find_partition_with_guid(const GUID& guid) const
-{
-	const auto& gpt_header = this->gpt_header();
-	const uint8_t* partition_entry_array_start = m_mmap + gpt_header.partition_entry_lba * SECTOR_SIZE;
-	for (std::size_t i = 0; i < gpt_header.number_of_partition_entries; i++)
-	{
-		const auto& partition_entry = *reinterpret_cast<const GPTPartitionEntry*>(partition_entry_array_start + i * gpt_header.size_of_partition_entry);
-		if (partition_entry.partition_guid != guid)
-			continue;
-		return partition_entry;
-	}
-	return {};
-}
-
-std::optional<GPTPartitionEntry> GPTFile::find_partition_with_type(const GUID& type_guid) const
-{
-	const auto& gpt_header = this->gpt_header();
-	const uint8_t* partition_entry_array_start = m_mmap + gpt_header.partition_entry_lba * SECTOR_SIZE;
-	for (std::size_t i = 0; i < gpt_header.number_of_partition_entries; i++)
-	{
-		const auto& partition_entry = *reinterpret_cast<const GPTPartitionEntry*>(partition_entry_array_start + i * gpt_header.size_of_partition_entry);
-		if (partition_entry.type_guid != type_guid)
-			continue;
-		return partition_entry;
-	}
-	return {};
-}
-
-bool GPTFile::validate_gpt_header() const
-{
-    if (SECTOR_SIZE + m_stat.st_size < sizeof(GPTHeader))
-    {
-		std::cerr << m_path << " is too small to have GPT header" << std::endl;
-        return false;
-    }
-
-    auto gpt_header = this->gpt_header();
-
-    if (std::memcmp(gpt_header.signature, "EFI PART", 8) != 0)
-    {
-		std::cerr << m_path << " doesn't contain GPT partition header signature" << std::endl;
-		return false;
-    }
-
-	const uint32_t header_crc32 = gpt_header.header_crc32;
-
-	gpt_header.header_crc32 = 0;
-	if (header_crc32 != crc32_checksum(reinterpret_cast<uint8_t*>(&gpt_header), gpt_header.header_size))
-	{
-		std::cerr << m_path << " has non-matching header crc32" << std::endl;
-		return false;
-	}
-
-	const std::size_t partition_array_size = gpt_header.number_of_partition_entries * gpt_header.size_of_partition_entry;
-	if (gpt_header.partition_entry_array_crc32 != crc32_checksum(m_mmap + gpt_header.partition_entry_lba * SECTOR_SIZE, partition_array_size))
-	{
-		std::cerr << m_path << " has non-matching partition entry crc32" << std::endl;
-		return false;
-	}
-
-    return true;
-}

bootloader/installer/GPT.h

@@ -1,91 +0,0 @@
-#pragma once
-
-#include "GUID.h"
-
-#include <cstdint>
-#include <optional>
-#include <span>
-#include <string_view>
-#include <string>
-#include <sys/stat.h>
-
-struct MBRPartitionRecord
-{
-	uint8_t boot_indicator;
-	uint8_t starting_chs[3];
-	uint8_t os_type;
-	uint8_t ending_chs[3];
-	uint32_t starting_lba;
-	uint32_t size_in_lba;
-} __attribute__((packed));
-
-struct MBR
-{
-	uint8_t boot_code[440];
-	uint32_t unique_mbr_disk_signature;
-	uint16_t unknown;
-	MBRPartitionRecord partition_records[4];
-	uint16_t signature;
-} __attribute__((packed));
-static_assert(sizeof(MBR) == 512);
-
-struct GPTPartitionEntry
-{
-	GUID type_guid;
-	GUID partition_guid;
-	uint64_t starting_lba;
-	uint64_t ending_lba;
-	uint64_t attributes;
-	uint16_t name[36];
-};
-static_assert(sizeof(GPTPartitionEntry) == 128);
-
-struct GPTHeader
-{
-	char signature[8];
-	uint32_t revision;
-	uint32_t header_size;
-	uint32_t header_crc32;
-	uint32_t reserved;
-	uint64_t my_lba;
-	uint64_t alternate_lba;
-	uint64_t first_usable_lba;
-	uint64_t last_usable_lba;
-	GUID disk_guid;
-	uint64_t partition_entry_lba;
-	uint32_t number_of_partition_entries;
-	uint32_t size_of_partition_entry;
-	uint32_t partition_entry_array_crc32;
-} __attribute__((packed));
-static_assert(sizeof(GPTHeader) == 92);
-
-class GPTFile
-{
-public:
-	GPTFile(std::string_view path);
-	~GPTFile();
-
-	bool install_bootloader(std::span<const uint8_t> stage1, std::span<const uint8_t> stage2, std::span<const uint8_t> data, const GUID& root_partition_guid);
-
-	const GPTHeader& gpt_header() const;
-
-	bool success() const { return m_success; }
-
-	std::string_view path() const { return m_path; }
-
-private:
-	MBR& mbr();
-	bool validate_gpt_header() const;
-	std::optional<GPTPartitionEntry> find_partition_with_guid(const GUID& guid) const;
-	std::optional<GPTPartitionEntry> find_partition_with_type(const GUID& type_guid) const;
-
-	bool install_stage1(std::span<const uint8_t> stage1);
-	bool install_stage2(std::span<const uint8_t> stage2, std::span<const uint8_t> data, const GUID& root_partition_guid);
-
-private:
-	const std::string	m_path;
-	bool				m_success	{ false };
-	int					m_fd		{ -1 };
-	struct stat			m_stat		{ };
-	uint8_t*			m_mmap		{ nullptr };
-};

bootloader/installer/GUID.cpp

@@ -1,74 +0,0 @@
-#include "GUID.h"
-
-#include <iomanip>
-#include <cstring>
-
-std::optional<uint64_t> parse_hex(std::string_view hex_string)
-{
-	uint64_t result = 0;
-	for (char c : hex_string)
-	{
-		if (!isxdigit(c))
-			return {};
-
-		uint8_t nibble = 0;
-		if ('0' <= c && c <= '9')
-			nibble = c - '0';
-		else if ('a' <= c && c <= 'f')
-			nibble = c - 'a' + 10;
-		else
-			nibble = c - 'A' + 10;
-		result = (result << 4) | nibble;
-	}
-	return result;
-}
-
-std::optional<GUID> GUID::from_string(std::string_view guid_string)
-{
-	if (guid_string.size() != 36)
-		return {};
-
-	if (guid_string[8] != '-' || guid_string[13] != '-' || guid_string[18] != '-' || guid_string[23] != '-')
-		return {};
-
-	auto comp1 = parse_hex(guid_string.substr(0, 8));
-	auto comp2 = parse_hex(guid_string.substr(9, 4));
-	auto comp3 = parse_hex(guid_string.substr(14, 4));
-	auto comp4 = parse_hex(guid_string.substr(19, 4));
-	auto comp5 = parse_hex(guid_string.substr(24, 12));
-
-	if (!comp1.has_value() || !comp2.has_value() || !comp3.has_value() || !comp4.has_value() || !comp5.has_value())
-		return {};
-
-	GUID result;
-	result.component1 = *comp1;
-	result.component2 = *comp2;
-	result.component3 = *comp3;
-	for (int i = 0; i < 2; i++)
-		result.component45[i + 0] = *comp4 >> ((2-1) * 8 - i * 8);
-	for (int i = 0; i < 6; i++)
-		result.component45[i + 2] = *comp5 >> ((6-1) * 8 - i * 8);
-	return result;
-}
-
-bool GUID::operator==(const GUID& other) const
-{
-	return std::memcmp(this, &other, sizeof(GUID)) == 0;
-}
-
-std::ostream& operator<<(std::ostream& out, const GUID& guid)
-{
-	auto flags = out.flags();
-	out << std::hex << std::setfill('0');
-	out << std::setw(8) << guid.component1 << '-';
-	out << std::setw(4) << guid.component2 << '-';
-	out << std::setw(4) << guid.component3 << '-';
-
-	out << std::setw(2);
-	for (int i = 0; i < 2; i++) out << +guid.component45[i];
-	out << '-';
-	for (int i = 2; i < 8; i++) out << +guid.component45[i];
-
-	out.flags(flags);
-	return out;
-}

bootloader/installer/GUID.h

@@ -1,37 +0,0 @@
-#pragma once
-
-#include <cstdint>
-#include <optional>
-#include <ostream>
-#include <string_view>
-
-struct GUID
-{
-	static std::optional<GUID> from_string(std::string_view);
-
-	uint32_t component1;
-	uint16_t component2;
-	uint16_t component3;
-	// last 2 components are combined so no packed needed
-	uint8_t component45[8];
-
-	bool operator==(const GUID& other) const;
-};
-
-std::ostream& operator<<(std::ostream& out, const GUID& guid);
-
-// unused		00000000-0000-0000-0000-000000000000
-static constexpr GUID unused_guid = {
-	0x00000000,
-	0x0000,
-	0x0000,
-	{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
-};
-
-// bios boot	21686148-6449-6E6F-744E-656564454649
-static constexpr GUID bios_boot_guid = {
-	0x21686148,
-	0x6449,
-	0x6E6F,
-	{ 0x74, 0x4E, 0x65, 0x65, 0x64, 0x45, 0x46, 0x49 }
-};

bootloader/installer/crc32.cpp

@@ -1,80 +0,0 @@
-#include "crc32.h"
-
-static constexpr uint32_t crc32_table[256] =
-{
-	0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
-	0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
-	0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
-	0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
-	0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
-	0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
-	0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
-	0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
-	0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
-	0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
-	0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
-	0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
-	0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
-	0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
-	0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
-	0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
-	0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
-	0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
-	0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
-	0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
-	0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
-	0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
-	0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
-	0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
-	0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
-	0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
-	0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
-	0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
-	0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
-	0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
-	0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
-	0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
-	0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
-	0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
-	0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
-	0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
-	0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
-	0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
-	0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
-	0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
-	0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
-	0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
-	0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
-	0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
-	0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
-	0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
-	0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
-	0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
-	0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
-	0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
-	0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
-	0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
-	0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
-	0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
-	0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
-	0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
-	0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
-	0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
-	0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
-	0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
-	0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
-	0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
-	0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
-	0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D,
-};
-
-uint32_t crc32_checksum(const uint8_t* data, std::size_t count)
-{
-	uint32_t crc32 = 0xFFFFFFFF;
-	for (size_t i = 0; i < count; i++)
-	{
-		uint8_t index = (crc32 ^ data[i]) & 0xFF;
-		crc32 = (crc32 >> 8) ^ crc32_table[index];
-	}
-	return crc32 ^ 0xFFFFFFFF;
-}

bootloader/installer/crc32.h

@@ -1,6 +0,0 @@
-#pragma once
-
-#include <cstddef>
-#include <cstdint>
-
-uint32_t crc32_checksum(const uint8_t* data, std::size_t count);

bootloader/installer/main.cpp

@@ -1,45 +0,0 @@
-#include "ELF.h"
-#include "GPT.h"
-
-#include <iostream>
-
-int main(int argc, char** argv)
-{
-	using namespace std::string_view_literals;
-
-	if (argc != 4)
-	{
-		std::fprintf(stderr, "usage: %s BOOTLOADER DISK_IMAGE ROOT_PARTITION_GUID\n", argv[0]);
-		return 1;
-	}
-
-	auto root_partition_guid = GUID::from_string(argv[3]);
-	if (!root_partition_guid.has_value())
-	{
-		std::cerr << "invalid guid '" << argv[3] << '\'' << std::endl;
-		return 1;
-	}
-
-	ELFFile bootloader(argv[1]);
-	if (!bootloader.success())
-		return 1;
-
-	auto stage1 = bootloader.find_section(".stage1"sv);
-	auto stage2 = bootloader.find_section(".stage2"sv);
-	auto data = bootloader.find_section(".data"sv);
-	if (!stage1.has_value() || !stage2.has_value() || !data.has_value())
-	{
-		std::cerr << bootloader.path() << " doesn't contain .stage1, .stage2 and .data sections" << std::endl;
-		return 1;
-	}
-
-	GPTFile disk_image(argv[2]);
-	if (!disk_image.success())
-		return 1;
-
-	if (!disk_image.install_bootloader(*stage1, *stage2, *data, *root_partition_guid))
-		return 1;
-	std::cout << "bootloader installed" << std::endl;
-
-	return 0;
-}

bos

@@ -1 +0,0 @@
-script/build.sh

check-fs.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -e
+
+LOOP_DEV=$(sudo losetup -f --show $DISK_IMAGE_PATH)
+sudo partprobe $LOOP_DEV
+
+sudo fsck.ext2 -fn ${LOOP_DEV}p2 || true
+
+sudo losetup -d $LOOP_DEV

image-full.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+set -e
+
+DISK_SIZE=$[50 * 1024 * 1024]
+MOUNT_DIR=/mnt
+
+truncate -s 0 $DISK_IMAGE_PATH
+truncate -s $DISK_SIZE $DISK_IMAGE_PATH
+
+sed -e 's/\s*\([-\+[:alnum:]]*\).*/\1/' << EOF | fdisk $DISK_IMAGE_PATH > /dev/null
+  g     # gpt
+  n     # new partition
+  1     # partition number 1
+        # default (from the beginning of the disk)
+  +1MiB # bios boot partiton size
+  n     # new partition
+  2     # partition number 2
+        # default (right after bios boot partition)
+		# default (to the end of disk)
+  t     # set type
+  1     # ... of partition 1
+  4     # bios boot partition
+  t     # set type
+  2     # ... of partition 2
+  20    # Linux filesystem
+  w     # write changes
+EOF
+
+LOOP_DEV=$(sudo losetup -f --show $DISK_IMAGE_PATH)
+sudo partprobe $LOOP_DEV
+
+PARTITION1=${LOOP_DEV}p1
+PARTITION2=${LOOP_DEV}p2
+
+sudo mkfs.ext2 -d $SYSROOT -b 1024 -q $PARTITION2
+
+sudo mount $PARTITION2 $MOUNT_DIR
+sudo grub-install --no-floppy --target=i386-pc --modules="normal ext2 multiboot" --boot-directory=${MOUNT_DIR}/boot $LOOP_DEV
+sudo umount $MOUNT_DIR
+
+sudo losetup -d $LOOP_DEV

image.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+if [ ! -f $DISK_IMAGE_PATH ]; then
+	$(dirname "$0")/image-full.sh
+	exit 0
+fi
+
+MOUNT_DIR=/mnt
+
+LOOP_DEV=$(sudo losetup -f --show $DISK_IMAGE_PATH)
+sudo partprobe $LOOP_DEV
+
+ROOT_PARTITON=${LOOP_DEV}p2
+
+sudo mount $ROOT_PARTITON $MOUNT_DIR
+
+sudo rsync -a ${SYSROOT}/* ${MOUNT_DIR}/
+
+sudo umount $MOUNT_DIR
+
+sudo losetup -d $LOOP_DEV

kernel/CMakeLists.txt

@@ -1,130 +1,77 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(kernel CXX C ASM)
+
+if("${BANAN_ARCH}" STREQUAL "x86_64")
+	set(ELF_FORMAT elf64-x86-64)
+elseif("${BANAN_ARCH}" STREQUAL "i386")
+	set(ELF_FORMAT elf32-i386)
+endif()
+
 set(KERNEL_SOURCES
 	font/prefs.psf.o
-	kernel/ACPI/ACPI.cpp
+	kernel/ACPI.cpp
-	kernel/ACPI/AML/Namespace.cpp
-	kernel/ACPI/AML/Node.cpp
-	kernel/ACPI/AML/OpRegion.cpp
-	kernel/ACPI/BatterySystem.cpp
-	kernel/ACPI/EmbeddedController.cpp
 	kernel/APIC.cpp
-	kernel/Audio/AC97/Controller.cpp
-	kernel/Audio/Controller.cpp
-	kernel/Audio/HDAudio/AudioFunctionGroup.cpp
-	kernel/Audio/HDAudio/Controller.cpp
-	kernel/BootInfo.cpp
 	kernel/CPUID.cpp
-	kernel/Credentials.cpp
 	kernel/Debug.cpp
-	kernel/Device/DebugDevice.cpp
 	kernel/Device/Device.cpp
-	kernel/Device/FramebufferDevice.cpp
 	kernel/Device/NullDevice.cpp
-	kernel/Device/RandomDevice.cpp
 	kernel/Device/ZeroDevice.cpp
-	kernel/ELF.cpp
-	kernel/Epoll.cpp
 	kernel/Errors.cpp
+	kernel/Font.cpp
 	kernel/FS/DevFS/FileSystem.cpp
-	kernel/FS/EventFD.cpp
 	kernel/FS/Ext2/FileSystem.cpp
 	kernel/FS/Ext2/Inode.cpp
-	kernel/FS/FAT/FileSystem.cpp
-	kernel/FS/FAT/Inode.cpp
-	kernel/FS/FileSystem.cpp
 	kernel/FS/Inode.cpp
 	kernel/FS/Pipe.cpp
 	kernel/FS/ProcFS/FileSystem.cpp
 	kernel/FS/ProcFS/Inode.cpp
-	kernel/FS/TmpFS/FileSystem.cpp
+	kernel/FS/RamFS/FileSystem.cpp
-	kernel/FS/TmpFS/Inode.cpp
+	kernel/FS/RamFS/Inode.cpp
-	kernel/FS/USTARModule.cpp
 	kernel/FS/VirtualFileSystem.cpp
-	kernel/GDT.cpp
+	kernel/Input/PS2Controller.cpp
-	kernel/IDT.cpp
+	kernel/Input/PS2Keyboard.cpp
-	kernel/Input/InputDevice.cpp
+	kernel/Input/PS2Keymap.cpp
-	kernel/Input/PS2/Controller.cpp
-	kernel/Input/PS2/Device.cpp
-	kernel/Input/PS2/Keyboard.cpp
-	kernel/Input/PS2/Keymap.cpp
-	kernel/Input/PS2/Mouse.cpp
-	kernel/Interruptable.cpp
 	kernel/InterruptController.cpp
 	kernel/kernel.cpp
-	kernel/Lock/SpinLock.cpp
-	kernel/Memory/ByteRingBuffer.cpp
-	kernel/Memory/DMARegion.cpp
 	kernel/Memory/FileBackedRegion.cpp
+	kernel/Memory/GeneralAllocator.cpp
 	kernel/Memory/Heap.cpp
 	kernel/Memory/kmalloc.cpp
 	kernel/Memory/MemoryBackedRegion.cpp
 	kernel/Memory/MemoryRegion.cpp
 	kernel/Memory/PhysicalRange.cpp
-	kernel/Memory/SharedMemoryObject.cpp
 	kernel/Memory/VirtualRange.cpp
-	kernel/Networking/ARPTable.cpp
+	kernel/Networking/E1000.cpp
-	kernel/Networking/E1000/E1000.cpp
-	kernel/Networking/E1000/E1000E.cpp
-	kernel/Networking/IPv4Layer.cpp
-	kernel/Networking/Loopback.cpp
-	kernel/Networking/NetworkInterface.cpp
-	kernel/Networking/NetworkLayer.cpp
-	kernel/Networking/NetworkManager.cpp
-	kernel/Networking/NetworkSocket.cpp
-	kernel/Networking/RTL8169/RTL8169.cpp
-	kernel/Networking/TCPSocket.cpp
-	kernel/Networking/UDPSocket.cpp
-	kernel/Networking/UNIX/Socket.cpp
 	kernel/OpenFileDescriptorSet.cpp
 	kernel/Panic.cpp
 	kernel/PCI.cpp
 	kernel/PIC.cpp
 	kernel/Process.cpp
-	kernel/Processor.cpp
-	kernel/Random.cpp
 	kernel/Scheduler.cpp
+	kernel/Semaphore.cpp
+	kernel/SpinLock.cpp
 	kernel/SSP.cpp
-	kernel/Storage/ATA/AHCI/Controller.cpp
+	kernel/Storage/ATABus.cpp
-	kernel/Storage/ATA/AHCI/Device.cpp
+	kernel/Storage/ATAController.cpp
-	kernel/Storage/ATA/ATABus.cpp
+	kernel/Storage/ATADevice.cpp
-	kernel/Storage/ATA/ATAController.cpp
-	kernel/Storage/ATA/ATADevice.cpp
 	kernel/Storage/DiskCache.cpp
-	kernel/Storage/NVMe/Controller.cpp
-	kernel/Storage/NVMe/Namespace.cpp
-	kernel/Storage/NVMe/Queue.cpp
-	kernel/Storage/Partition.cpp
-	kernel/Storage/SCSI.cpp
 	kernel/Storage/StorageDevice.cpp
 	kernel/Syscall.cpp
-	kernel/Terminal/FramebufferTerminal.cpp
+	kernel/Syscall.S
-	kernel/Terminal/PseudoTerminal.cpp
 	kernel/Terminal/Serial.cpp
-	kernel/Terminal/TerminalDriver.cpp
-	kernel/Terminal/TextModeTerminal.cpp
 	kernel/Terminal/TTY.cpp
+	kernel/Terminal/VesaTerminalDriver.cpp
 	kernel/Terminal/VirtualTTY.cpp
 	kernel/Thread.cpp
-	kernel/ThreadBlocker.cpp
 	kernel/Timer/HPET.cpp
 	kernel/Timer/PIT.cpp
 	kernel/Timer/RTC.cpp
 	kernel/Timer/Timer.cpp
-	kernel/USB/Controller.cpp
-	kernel/USB/Device.cpp
-	kernel/USB/HID/HIDDriver.cpp
-	kernel/USB/HID/Joystick.cpp
-	kernel/USB/HID/Keyboard.cpp
-	kernel/USB/HID/Mouse.cpp
-	kernel/USB/Hub/HubDriver.cpp
-	kernel/USB/MassStorage/MassStorageDriver.cpp
-	kernel/USB/MassStorage/SCSIDevice.cpp
-	kernel/USB/USBManager.cpp
-	kernel/USB/XHCI/Controller.cpp
-	kernel/USB/XHCI/Device.cpp
 	icxxabi.cpp
 )
 
-set(ENABLE_KERNEL_UBSAN False)
+#set(ENABLE_KERNEL_UBSAN True)
 
 if(ENABLE_KERNEL_UBSAN)
 	set(KERNEL_SOURCES ${KERNEL_SOURCES} ubsan.cpp)
@@ -134,153 +81,127 @@ if("${BANAN_ARCH}" STREQUAL "x86_64")
 	set(KERNEL_SOURCES
 		${KERNEL_SOURCES}
 		arch/x86_64/boot.S
+		arch/x86_64/GDT.cpp
+		arch/x86_64/IDT.cpp
 		arch/x86_64/interrupts.S
 		arch/x86_64/PageTable.cpp
 		arch/x86_64/Signal.S
-		arch/x86_64/Syscall.S
 		arch/x86_64/Thread.S
-		arch/x86_64/User.S
-		arch/x86_64/Yield.S
 	)
-elseif("${BANAN_ARCH}" STREQUAL "i686")
+elseif("${BANAN_ARCH}" STREQUAL "i386")
 	set(KERNEL_SOURCES
 		${KERNEL_SOURCES}
-		arch/i686/boot.S
+		arch/i386/boot.S
-		arch/i686/interrupts.S
+		arch/i386/GDT.cpp
-		arch/i686/PageTable.cpp
+		arch/i386/IDT.cpp
-		arch/i686/Signal.S
+		arch/i386/MMU.cpp
-		arch/i686/Syscall.S
+		arch/i386/SpinLock.S
-		arch/i686/Thread.S
+		arch/i386/Thread.S
-		arch/i686/User.S
-		arch/i686/Yield.S
 	)
 else()
 	message(FATAL_ERROR "unsupported architecure ${BANAN_ARCH}")
 endif()
 
+file(GLOB_RECURSE LAI_SOURCES
+	lai/*.c
+)
+set(LAI_SOURCES
+	${LAI_SOURCES}
+	kernel/lai_host.cpp
+)
+
 set(BAN_SOURCES
-	../BAN/BAN/Assert.cpp
 	../BAN/BAN/New.cpp
+	../BAN/BAN/String.cpp
 	../BAN/BAN/StringView.cpp
 	../BAN/BAN/Time.cpp
 )
 
-set(KLIBC_SOURCES
+set(LIBC_SOURCES
-	klibc/ctype.cpp
+	../libc/ctype.cpp
-	klibc/string.cpp
+	../libc/string.cpp
-
-	# Ehhh don't do this but for now libc uses the same stuff kernel can use
-	# This won't work after libc starts using sse implemetations tho
-	../userspace/libraries/LibC/arch/${BANAN_ARCH}/string.S
 )
 
-set(LIBDEFLATE_SOURCE
+set(LIBELF_SOURCES
-	../userspace/libraries/LibDEFLATE/Compressor.cpp
+	../LibELF/LibELF/LoadableELF.cpp
-	../userspace/libraries/LibDEFLATE/Decompressor.cpp
-	../userspace/libraries/LibDEFLATE/HuffmanTree.cpp
-)
-
-set(LIBFONT_SOURCES
-	../userspace/libraries/LibFont/Font.cpp
-	../userspace/libraries/LibFont/PSF.cpp
-)
-
-set(LIBINPUT_SOURCE
-	../userspace/libraries/LibInput/KeyboardLayout.cpp
-	../userspace/libraries/LibInput/KeyEvent.cpp
-)
-
-set(LIBQR_SOURCE
-	../userspace/libraries/LibQR/QRCode.cpp
 )
 
 set(KERNEL_SOURCES
 	${KERNEL_SOURCES}
+	${LAI_SOURCES}
 	${BAN_SOURCES}
-	${KLIBC_SOURCES}
+	${LIBC_SOURCES}
-	${LIBDEFLATE_SOURCE}
+	${LIBELF_SOURCES}
-	${LIBFONT_SOURCES}
-	${LIBINPUT_SOURCE}
-	${LIBQR_SOURCE}
 )
 
 add_executable(kernel ${KERNEL_SOURCES})
+add_dependencies(kernel headers)
 
-target_compile_definitions(kernel PRIVATE __is_kernel)
+target_compile_definitions(kernel PUBLIC __is_kernel)
-target_compile_definitions(kernel PRIVATE __arch=${BANAN_ARCH})
+target_compile_definitions(kernel PUBLIC __arch=${BANAN_ARCH})
-target_compile_definitions(kernel PRIVATE LIBDEFLATE_AVOID_STACK=1)
 
-target_compile_options(kernel PRIVATE
+target_compile_options(kernel PUBLIC -O2 -g)
-	-O2 -g
+target_compile_options(kernel PUBLIC $<$<COMPILE_LANGUAGE:CXX>:-Wno-literal-suffix -fno-rtti -fno-exceptions>)
-	-fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=.
+target_compile_options(kernel PUBLIC -fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=.)
-	-fstack-protector
+target_compile_options(kernel PUBLIC -fstack-protector -ffreestanding -Wall -Werror=return-type -Wstack-usage=1024 -fno-omit-frame-pointer -mgeneral-regs-only)
-	-ffreestanding
-	-fno-omit-frame-pointer
-	-fstrict-volatile-bitfields
-	-mgeneral-regs-only
-	-Wall -Wextra -Werror -Wstack-usage=1024
-)
-
-# C++ specific
-target_compile_options(kernel PRIVATE
-	-Wno-literal-suffix
-	-Wno-invalid-offsetof
-	-fno-rtti
-	-fno-exceptions
-)
 
 if(ENABLE_KERNEL_UBSAN)
-	target_compile_options(kernel PRIVATE -fsanitize=undefined)
+	target_compile_options(kernel PUBLIC -fsanitize=undefined)
 endif()
 
 if("${BANAN_ARCH}" STREQUAL "x86_64")
-	target_compile_options(kernel PRIVATE -mcmodel=kernel -mno-red-zone)
+	target_compile_options(kernel PUBLIC -mcmodel=kernel -mno-red-zone -mno-mmx)
-	target_link_options(kernel PRIVATE LINKER:-z,max-page-size=4096)
+	target_link_options(kernel PUBLIC LINKER:-z,max-page-size=4096)
-	target_link_options(kernel PRIVATE LINKER:-T,${CMAKE_CURRENT_SOURCE_DIR}/arch/x86_64/linker.ld)
+	target_link_options(kernel PUBLIC LINKER:-T,${CMAKE_CURRENT_SOURCE_DIR}/arch/x86_64/linker.ld)
-elseif("${BANAN_ARCH}" STREQUAL "i686")
+elseif("${BANAN_ARCH}" STREQUAL "i386")
-	target_link_options(kernel PRIVATE LINKER:-T,${CMAKE_CURRENT_SOURCE_DIR}/arch/i686/linker.ld)
+	target_link_options(kernel PUBLIC LINKER:-T,${CMAKE_CURRENT_SOURCE_DIR}/arch/i386/linker.ld)
 endif()
 
-target_link_options(kernel PRIVATE -ffreestanding -nostdlib -orphan-handling=error)
+target_link_options(kernel PUBLIC -ffreestanding -nostdlib)
 
-get_target_property(KERNEL_COMPILE_OPTIONS kernel COMPILE_OPTIONS)
+add_custom_target(crt0
-execute_process(COMMAND ${CMAKE_CXX_COMPILER} ${KERNEL_COMPILE_OPTIONS} -print-file-name=crtbegin.o OUTPUT_VARIABLE CRTBEGIN OUTPUT_STRIP_TRAILING_WHITESPACE)
+	COMMAND ${CMAKE_CXX_COMPILER} -c ${CMAKE_CURRENT_SOURCE_DIR}/arch/${BANAN_ARCH}/crt0.S -o ${CMAKE_CURRENT_BINARY_DIR}/crt0.o
-execute_process(COMMAND ${CMAKE_CXX_COMPILER} ${KERNEL_COMPILE_OPTIONS} -print-file-name=crtend.o OUTPUT_VARIABLE CRTEND OUTPUT_STRIP_TRAILING_WHITESPACE)
+	DEPENDS headers
+)
+
+add_custom_command(
+	TARGET crt0
+	POST_BUILD
+	COMMAND sudo cp ${CMAKE_CURRENT_BINARY_DIR}/crt0.o ${BANAN_LIB}/
+)
+
+add_custom_target(kernel-headers
+	COMMAND sudo rsync -a ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
+	COMMAND sudo rsync -a ${CMAKE_CURRENT_SOURCE_DIR}/lai/include/ ${BANAN_INCLUDE}/
+	DEPENDS sysroot
+	USES_TERMINAL
+)
+
+add_custom_target(kernel-install
+	COMMAND sudo cp ${CMAKE_CURRENT_BINARY_DIR}/kernel ${BANAN_BOOT}/banan-os.kernel
+	DEPENDS kernel
+	USES_TERMINAL
+)
+
+execute_process(COMMAND ${CMAKE_CXX_COMPILER} -print-file-name=crtbegin.o OUTPUT_VARIABLE CRTBEGIN OUTPUT_STRIP_TRAILING_WHITESPACE)
+execute_process(COMMAND ${CMAKE_CXX_COMPILER} -print-file-name=crtend.o OUTPUT_VARIABLE CRTEND OUTPUT_STRIP_TRAILING_WHITESPACE)
 
 add_custom_command(
 	TARGET kernel PRE_LINK
 	COMMAND ${CMAKE_CXX_COMPILER} -MD -c ${CMAKE_CURRENT_SOURCE_DIR}/arch/${BANAN_ARCH}/crti.S ${COMPILE_OPTIONS}
 	COMMAND ${CMAKE_CXX_COMPILER} -MD -c ${CMAKE_CURRENT_SOURCE_DIR}/arch/${BANAN_ARCH}/crtn.S ${COMPILE_OPTIONS}
-	COMMAND ${CMAKE_COMMAND} -E copy ${CRTBEGIN} .
+	COMMAND cp ${CRTBEGIN} .
-	COMMAND ${CMAKE_COMMAND} -E copy ${CRTEND} .
+	COMMAND cp ${CRTEND} .
 )
 
-#add_custom_command(
+add_custom_command(
-#	TARGET kernel POST_BUILD
+	TARGET kernel POST_BUILD
-#	COMMAND x86_64-banan_os-strip ${CMAKE_CURRENT_BINARY_DIR}/kernel
+	COMMAND x86_64-banan_os-strip ${CMAKE_CURRENT_BINARY_DIR}/kernel
-#)
+)
-
-banan_include_headers(kernel ban)
-banan_include_headers(kernel libc)
-banan_include_headers(kernel libdeflate)
-banan_include_headers(kernel libelf)
-banan_include_headers(kernel libfont)
-banan_include_headers(kernel libinput)
-banan_include_headers(kernel libqr)
-
-banan_install_headers(kernel)
-set_target_properties(kernel PROPERTIES OUTPUT_NAME banan-os.kernel)
-install(TARGETS kernel DESTINATION ${BANAN_BOOT} OPTIONAL)
-
-if("${BANAN_ARCH}" STREQUAL "x86_64")
-	set(ELF_FORMAT elf64-x86-64)
-elseif("${BANAN_ARCH}" STREQUAL "i686")
-	set(ELF_FORMAT elf32-i386)
-endif()
 
 add_custom_command(
 	OUTPUT font/prefs.psf.o
-	COMMAND cd ${CMAKE_CURRENT_SOURCE_DIR} && mkdir -p ${CMAKE_CURRENT_BINARY_DIR}/font && objcopy -O ${ELF_FORMAT} -B i386 -I binary font/prefs.psf ${CMAKE_CURRENT_BINARY_DIR}/font/prefs.psf.o
+	COMMAND cd ${CMAKE_CURRENT_SOURCE_DIR} && objcopy -O ${ELF_FORMAT} -B i386 -I binary font/prefs.psf ${CMAKE_CURRENT_BINARY_DIR}/font/prefs.psf.o
 )
 
 set(CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_COMPILER} <CMAKE_CXX_LINK_FLAGS> <FLAGS> <LINK_FLAGS> -o <TARGET> ${CMAKE_CURRENT_BINARY_DIR}/crti.o ${CMAKE_CURRENT_BINARY_DIR}/crtbegin.o <OBJECTS> ${CMAKE_CURRENT_BINARY_DIR}/crtend.o ${CMAKE_CURRENT_BINARY_DIR}/crtn.o -lgcc ")

kernel/arch/i386/GDT.cpp

@@ -0,0 +1,147 @@
+#include <BAN/Assert.h>
+#include <kernel/GDT.h>
+
+#include <string.h>
+
+extern "C" uintptr_t g_boot_stack_top[0];
+
+namespace Kernel::GDT
+{
+
+	struct TaskStateSegment
+	{
+		uint16_t link;
+		uint16_t reserved1;
+		uint32_t esp0;
+		uint16_t ss0;
+		uint16_t reserved2;
+		uint32_t esp1;
+		uint16_t ss1;
+		uint16_t reserved3;
+		uint32_t esp2;
+		uint16_t ss2;
+		uint16_t reserved4;
+		uint32_t cr3;
+		uint32_t eip;
+		uint32_t eflags;
+		uint32_t eax;
+		uint32_t ecx;
+		uint32_t edx;
+		uint32_t ebx;
+		uint32_t esp;
+		uint32_t ebp;
+		uint32_t esi;
+		uint32_t edi;
+		uint16_t es;
+		uint16_t reserved5;
+		uint16_t cs;
+		uint16_t reserved6;
+		uint16_t ss;
+		uint16_t reserved7;
+		uint16_t ds;
+		uint16_t reserved8;
+		uint16_t fs;
+		uint16_t reserved9;
+		uint16_t gs;
+		uint16_t reserved10;
+		uint16_t ldtr;
+		uint16_t reserved11;
+		uint16_t reserved12;
+		uint16_t iopb;
+		uint32_t ssp;
+	} __attribute__((packed));
+
+	union SegmentDescriptor
+	{
+		struct
+		{
+			uint16_t	limit1;
+			uint16_t	base1;
+			uint8_t		base2;
+			uint8_t		access;
+			uint8_t		limit2 : 4;
+			uint8_t		flags  : 4;
+			uint8_t		base3;
+		} __attribute__((packed));
+		
+		struct
+		{
+			uint32_t low;
+			uint32_t high;
+		} __attribute__((packed));
+
+	} __attribute__((packed));
+
+	struct GDTR
+	{
+		uint16_t size;
+		uint32_t address;
+	} __attribute__((packed));
+
+	static TaskStateSegment* s_tss = nullptr;
+	static SegmentDescriptor* s_gdt = nullptr;
+	static GDTR s_gdtr;
+
+	static void write_entry(uint8_t offset, uint32_t base, uint32_t limit, uint8_t access, uint8_t flags)
+	{
+		SegmentDescriptor& desc = *(SegmentDescriptor*)((uintptr_t)s_gdt + offset);
+		desc.base1 = base;
+		desc.base2 = base >> 16;
+		desc.base3 = base >> 24;
+
+		desc.limit1 = limit;
+		desc.limit2 = limit >> 16;
+
+		desc.access = access;
+
+		desc.flags = flags;
+	}
+
+	static void write_tss(uint8_t offset)
+	{
+		s_tss = new TaskStateSegment();
+		ASSERT(s_tss);
+		
+		memset(s_tss, 0x00, sizeof(TaskStateSegment));
+		s_tss->ss0 = 0x10;
+		s_tss->esp0 = (uintptr_t)g_boot_stack_top;
+
+		write_entry(offset, (uint32_t)s_tss, sizeof(TaskStateSegment), 0x89, 0x0);
+	}
+
+	void set_tss_stack(uintptr_t esp)
+	{
+		s_tss->esp0 = esp;
+	}
+
+	static void flush_gdt()
+	{
+		asm volatile("lgdt %0" :: "m"(s_gdtr));
+	}
+
+	extern "C" void flush_tss(uint16_t offset)
+	{
+		asm volatile("ltr %0" :: "m"(offset));
+	}
+
+	void initialize()
+	{
+		constexpr uint32_t descriptor_count = 6;
+		s_gdt = new SegmentDescriptor[descriptor_count]; 
+		ASSERT(s_gdt);
+
+		s_gdtr.address = (uint64_t)s_gdt;
+		s_gdtr.size = descriptor_count * sizeof(SegmentDescriptor) - 1;
+
+		write_entry(0x00, 0x00000000, 0x00000, 0x00, 0x0); // null
+		write_entry(0x08, 0x00000000, 0xFFFFF, 0x9A, 0xC); // kernel code
+		write_entry(0x10, 0x00000000, 0xFFFFF, 0x92, 0xC); // kernel data
+		write_entry(0x18, 0x00000000, 0xFFFFF, 0xFA, 0xC); // user code
+		write_entry(0x20, 0x00000000, 0xFFFFF, 0xF2, 0xC); // user data
+		write_tss(0x28);
+
+		flush_gdt();
+		flush_tss(0x28);
+	}
+
+}

kernel/arch/i386/IDT.cpp

@@ -0,0 +1,270 @@
+#include <BAN/Errors.h>
+#include <kernel/IDT.h>
+#include <kernel/InterruptController.h>
+#include <kernel/Memory/kmalloc.h>
+#include <kernel/Panic.h>
+#include <kernel/Scheduler.h>
+
+#define INTERRUPT_HANDLER____(i, msg)													\
+	static void interrupt ## i ()														\
+	{																					\
+		uint32_t eax, ebx, ecx, edx;													\
+		uint32_t esp, ebp;																\
+		uint32_t cr0, cr2, cr3, cr4;													\
+		asm volatile("":"=a"(eax),"=b"(ebx),"=c"(ecx),"=d"(edx));						\
+		asm volatile("movl %%esp, %%eax":"=a"(esp));									\
+		asm volatile("movl %%ebp, %%eax":"=a"(ebp));									\
+		asm volatile("movl %%cr0, %%eax":"=a"(cr0)); 									\
+		asm volatile("movl %%cr2, %%eax":"=a"(cr2)); 									\
+		asm volatile("movl %%cr3, %%eax":"=a"(cr3)); 									\
+		asm volatile("movl %%cr4, %%eax":"=a"(cr4)); 									\
+		Kernel::panic(msg "\r\nRegister dump\r\n"										\
+			"eax=0x{8H}, ebx=0x{8H}, ecx=0x{8H}, edx=0x{8H}\r\n" 						\
+			"esp=0x{8H}, ebp=0x{8H}\r\n" 												\
+			"CR0=0x{8H}, CR2=0x{8H}, CR3=0x{8H}, CR4=0x{8H}\r\n", 						\
+			eax, ebx, ecx, edx, esp, ebp, cr0, cr2, cr3, cr4);							\
+	}
+
+#define INTERRUPT_HANDLER_ERR(i, msg)													\
+	static void interrupt ## i ()														\
+	{																					\
+		uint32_t eax, ebx, ecx, edx;													\
+		uint32_t esp, ebp;																\
+		uint32_t cr0, cr2, cr3, cr4;													\
+		uint32_t error_code;															\
+		asm volatile("":"=a"(eax),"=b"(ebx),"=c"(ecx),"=d"(edx));						\
+		asm volatile("movl %%esp, %%eax":"=a"(esp));									\
+		asm volatile("movl %%ebp, %%eax":"=a"(ebp));									\
+		asm volatile("movl %%cr0, %%eax":"=a"(cr0)); 									\
+		asm volatile("movl %%cr2, %%eax":"=a"(cr2)); 									\
+		asm volatile("movl %%cr3, %%eax":"=a"(cr3)); 									\
+		asm volatile("movl %%cr4, %%eax":"=a"(cr4)); 									\
+		asm volatile("popl %%eax":"=a"(error_code));									\
+		Kernel::panic(msg " (error code: 0x{8H})\r\n"									\
+			"Register dump\r\n"															\
+			"eax=0x{8H}, ebx=0x{8H}, ecx=0x{8H}, edx=0x{8H}\r\n" 						\
+			"esp=0x{8H}, ebp=0x{8H}\r\n" 												\
+			"CR0=0x{8H}, CR2=0x{8H}, CR3=0x{8H}, CR4=0x{8H}\r\n", 						\
+			eax, ebx, ecx, edx, esp, ebp, cr0, cr2, cr3, cr4, error_code);				\
+	}
+
+#define REGISTER_HANDLER(i) register_interrupt_handler(i, interrupt ## i)
+
+namespace IDT
+{
+
+	struct GateDescriptor
+	{
+		uint16_t offset1;
+		uint16_t selector;
+		uint8_t reserved	: 5;
+		uint8_t zero1		: 3;
+		uint8_t type		: 4;
+		uint8_t zero2		: 1;
+		uint8_t DPL			: 2;
+		uint8_t present		: 1;
+		uint16_t offset2;
+	} __attribute__((packed));
+
+	struct IDTR
+	{
+		uint16_t size;
+		void* offset;
+	} __attribute((packed));
+
+	static IDTR				s_idtr;
+	static GateDescriptor*	s_idt = nullptr;
+
+	static void(*s_irq_handlers[16])() { nullptr };
+
+	INTERRUPT_HANDLER____(0x00, "Division Error")
+	INTERRUPT_HANDLER____(0x01, "Debug")
+	INTERRUPT_HANDLER____(0x02, "Non-maskable Interrupt")
+	INTERRUPT_HANDLER____(0x03, "Breakpoint")
+	INTERRUPT_HANDLER____(0x04, "Overflow")
+	INTERRUPT_HANDLER____(0x05, "Bound Range Exception")
+	INTERRUPT_HANDLER____(0x06, "Invalid Opcode")
+	INTERRUPT_HANDLER____(0x07, "Device Not Available")
+	INTERRUPT_HANDLER_ERR(0x08, "Double Fault")
+	INTERRUPT_HANDLER____(0x09, "Coprocessor Segment Overrun")
+	INTERRUPT_HANDLER_ERR(0x0A, "Invalid TSS")
+	INTERRUPT_HANDLER_ERR(0x0B, "Segment Not Present")
+	INTERRUPT_HANDLER_ERR(0x0C, "Stack-Segment Fault")
+	INTERRUPT_HANDLER_ERR(0x0D, "General Protection Fault")
+	INTERRUPT_HANDLER_ERR(0x0E, "Page Fault")
+	INTERRUPT_HANDLER____(0x0F, "Unknown Exception 0x0F")
+	INTERRUPT_HANDLER____(0x10, "x87 Floating-Point Exception")
+	INTERRUPT_HANDLER_ERR(0x11, "Alignment Check")
+	INTERRUPT_HANDLER____(0x12, "Machine Check")
+	INTERRUPT_HANDLER____(0x13, "SIMD Floating-Point Exception")
+	INTERRUPT_HANDLER____(0x14, "Virtualization Exception")
+	INTERRUPT_HANDLER_ERR(0x15, "Control Protection Exception")
+	INTERRUPT_HANDLER____(0x16, "Unknown Exception 0x16")
+	INTERRUPT_HANDLER____(0x17, "Unknown Exception 0x17")
+	INTERRUPT_HANDLER____(0x18, "Unknown Exception 0x18")
+	INTERRUPT_HANDLER____(0x19, "Unknown Exception 0x19")
+	INTERRUPT_HANDLER____(0x1A, "Unknown Exception 0x1A")
+	INTERRUPT_HANDLER____(0x1B, "Unknown Exception 0x1B")
+	INTERRUPT_HANDLER____(0x1C, "Hypervisor Injection Exception")
+	INTERRUPT_HANDLER_ERR(0x1D, "VMM Communication Exception")
+	INTERRUPT_HANDLER_ERR(0x1E, "Security Exception")
+	INTERRUPT_HANDLER____(0x1F, "Unkown Exception 0x1F")
+
+	extern "C" void handle_irq()
+	{
+		uint8_t irq;
+		for (uint32_t i = 0; i < 16; i++)
+		{
+			if (InterruptController::get().is_in_service(i))
+			{
+				irq = i;
+				goto found;
+			}
+		}
+
+		dprintln("Spurious irq");
+		return;	
+found:
+		if (s_irq_handlers[irq])
+			s_irq_handlers[irq]();
+		else
+			dprintln("no handler for irq 0x{2H}\n", irq);
+
+		// NOTE: Scheduler sends PIT eoi's
+		if (irq != PIT_IRQ)
+			InterruptController::get().eoi(irq);
+
+		Kernel::Scheduler::get().reschedule_if_idling();
+	}
+
+	extern "C" void handle_irq_common();
+	asm(
+	".globl handle_irq_common;"
+	"handle_irq_common:"
+		"pusha;"
+		"pushw %ds;"
+		"pushw %es;"
+		"pushw %ss;"
+		"pushw %ss;"
+		"popw %ds;"
+		"popw %es;"
+		"call handle_irq;"
+		"popw %es;"
+		"popw %ds;"
+		"popa;"
+		"iret;"
+	);
+
+	extern "C" void syscall_asm();
+	asm(
+	".global syscall_asm;"
+	"syscall_asm:"
+		"pusha;"
+		"pushw %ds;"
+		"pushw %es;"
+		"pushw %ss;"
+		"pushw %ss;"
+		"popw %ds;"
+		"popw %es;"
+		"pushl %edx;"
+		"pushl %ecx;"
+		"pushl %ebx;"
+		"pushl %eax;"
+		"call cpp_syscall_handler;"
+		"addl $16, %esp;"
+		"popw %es;"
+		"popw %ds;"
+		
+		// NOTE: following instructions are same as in 'popa', except we skip eax
+		//       since it holds the return value of the syscall.
+		"popl %edi;"
+		"popl %esi;"
+		"popl %ebp;"
+		"addl $4, %esp;"
+		"popl %ebx;"
+		"popl %edx;"
+		"popl %ecx;"
+		"addl $4, %esp;"
+		
+		"iret;"
+	);
+
+	static void flush_idt()
+	{
+		asm volatile("lidt %0"::"m"(s_idtr));
+	}
+
+	static void register_interrupt_handler(uint8_t index, void(*f)())
+	{
+		GateDescriptor& descriptor = s_idt[index];
+		descriptor.offset1 = (uint32_t)f & 0xFFFF;
+		descriptor.selector = 0x08;
+		descriptor.type = 0xE;
+		descriptor.DPL = 0;
+		descriptor.present = 1;
+		descriptor.offset2 = (uint32_t)f >> 16;
+	}
+
+	void register_irq_handler(uint8_t irq, void(*f)())
+	{
+		s_irq_handlers[irq] = f;
+		register_interrupt_handler(IRQ_VECTOR_BASE + irq, handle_irq_common);
+		flush_idt();
+	}
+
+	void register_syscall_handler(uint8_t offset, void(*handler)())
+	{
+		register_interrupt_handler(offset, handler);
+		s_idt[offset].DPL = 3;
+	}
+
+	void initialize()
+	{
+		constexpr size_t idt_size = 0x100 * sizeof(GateDescriptor);
+
+		s_idt = (GateDescriptor*)kmalloc(idt_size);
+		ASSERT(s_idt);
+		memset(s_idt, 0x00, idt_size);
+
+		s_idtr.offset = s_idt;
+		s_idtr.size = idt_size - 1;
+
+		REGISTER_HANDLER(0x00);
+		REGISTER_HANDLER(0x01);
+		REGISTER_HANDLER(0x02);
+		REGISTER_HANDLER(0x03);
+		REGISTER_HANDLER(0x04);
+		REGISTER_HANDLER(0x05);
+		REGISTER_HANDLER(0x06);
+		REGISTER_HANDLER(0x07);
+		REGISTER_HANDLER(0x08);
+		REGISTER_HANDLER(0x09);
+		REGISTER_HANDLER(0x0A);
+		REGISTER_HANDLER(0x0B);
+		REGISTER_HANDLER(0x0C);
+		REGISTER_HANDLER(0x0D);
+		REGISTER_HANDLER(0x0E);
+		REGISTER_HANDLER(0x0F);
+		REGISTER_HANDLER(0x10);
+		REGISTER_HANDLER(0x11);
+		REGISTER_HANDLER(0x12);
+		REGISTER_HANDLER(0x13);
+		REGISTER_HANDLER(0x14);
+		REGISTER_HANDLER(0x15);
+		REGISTER_HANDLER(0x16);
+		REGISTER_HANDLER(0x17);
+		REGISTER_HANDLER(0x18);
+		REGISTER_HANDLER(0x19);
+		REGISTER_HANDLER(0x1A);
+		REGISTER_HANDLER(0x1B);
+		REGISTER_HANDLER(0x1C);
+		REGISTER_HANDLER(0x1D);
+		REGISTER_HANDLER(0x1E);
+		REGISTER_HANDLER(0x1F);
+
+		register_syscall_handler(0x80, syscall_asm);
+
+		flush_idt();
+	}
+
+}

kernel/arch/i386/MMU.cpp

@@ -0,0 +1,227 @@
+#include <BAN/Errors.h>
+#include <kernel/Debug.h>
+#include <kernel/Memory/MMU.h>
+#include <kernel/Memory/kmalloc.h>
+
+#include <string.h>
+
+#define MMU_DEBUG_PRINT 0
+
+// bits 31-12 set
+#define PAGE_MASK  0xfffff000
+#define FLAGS_MASK 0x00000fff
+
+namespace Kernel
+{
+
+	static MMU* s_instance = nullptr;
+
+	void MMU::initialize()
+	{
+		ASSERT(s_instance == nullptr);
+		s_instance = new MMU();
+		ASSERT(s_instance);
+		s_instance->initialize_kernel();
+		s_instance->load();
+	}
+
+	MMU& MMU::get()
+	{
+		ASSERT(s_instance);
+		return *s_instance;
+	}
+
+	static uint64_t* allocate_page_aligned_page()
+	{
+		uint64_t* page = (uint64_t*)kmalloc(PAGE_SIZE, PAGE_SIZE);
+		ASSERT(page);
+		ASSERT(((uintptr_t)page % PAGE_SIZE) == 0);
+		memset(page, 0, PAGE_SIZE);
+		return page;
+	}
+
+	void MMU::initialize_kernel()
+	{
+		m_highest_paging_struct = (uint64_t*)kmalloc(sizeof(uint64_t) * 4, 32);
+		ASSERT(m_highest_paging_struct);
+		ASSERT(((uintptr_t)m_highest_paging_struct % 32) == 0);
+
+		// allocate all page directories
+		for (int i = 0; i < 4; i++)
+		{
+			uint64_t* page_directory = allocate_page_aligned_page();
+			m_highest_paging_struct[i] = (uint64_t)page_directory | Flags::Present;
+		}
+
+		// FIXME: We should just identity map until g_kernel_end
+
+		// create and identity map first 6 MiB
+		uint64_t* page_directory1 = (uint64_t*)(m_highest_paging_struct[0] & PAGE_MASK);
+		for (uint64_t i = 0; i < 3; i++)
+		{
+			uint64_t* page_table = allocate_page_aligned_page();
+			for (uint64_t j = 0; j < 512; j++)
+				page_table[j] = (i << 21) | (j << 12) | Flags::ReadWrite | Flags::Present;
+
+			page_directory1[i] = (uint64_t)page_table | Flags::ReadWrite | Flags::Present;
+		}
+
+		// dont map first page (0 -> 4 KiB) so that nullptr dereference
+		// causes page fault :)
+		uint64_t* page_table1 = (uint64_t*)(page_directory1[0] & PAGE_MASK);
+		page_table1[0] = 0;
+	}
+
+	MMU::MMU()
+	{
+		if (s_instance == nullptr)
+			return;
+		
+		// Here we copy the s_instances paging structs since they are
+		// global for every process
+
+		uint64_t* global_pdpt = s_instance->m_highest_paging_struct;
+
+		uint64_t* pdpt = (uint64_t*)kmalloc(sizeof(uint64_t) * 4, 32);
+		ASSERT(pdpt);
+		
+		for (uint32_t pdpte = 0; pdpte < 4; pdpte++)
+		{
+			if (!(global_pdpt[pdpte] & Flags::Present))
+				continue;
+
+			uint64_t* global_pd = (uint64_t*)(global_pdpt[pdpte] & PAGE_MASK);
+
+			uint64_t* pd = allocate_page_aligned_page();
+			pdpt[pdpte] = (uint64_t)pd | (global_pdpt[pdpte] & ~PAGE_MASK);
+
+			for (uint32_t pde = 0; pde < 512; pde++)
+			{
+				if (!(global_pd[pde] & Flags::Present))
+					continue;
+
+				uint64_t* global_pt = (uint64_t*)(global_pd[pde] & PAGE_MASK);
+
+				uint64_t* pt = allocate_page_aligned_page();
+				pd[pde] = (uint64_t)pt | (global_pd[pde] & ~PAGE_MASK);
+
+				memcpy(pt, global_pt, PAGE_SIZE);
+			}
+		}
+
+		m_highest_paging_struct = pdpt;
+	}
+
+	MMU::~MMU()
+	{
+		uint64_t* pdpt = m_highest_paging_struct;
+		for (uint32_t pdpte = 0; pdpte < 512; pdpte++)
+		{
+			if (!(pdpt[pdpte] & Flags::Present))
+				continue;
+			uint64_t* pd = (uint64_t*)(pdpt[pdpte] & PAGE_MASK);
+			for (uint32_t pde = 0; pde < 512; pde++)
+			{
+				if (!(pd[pde] & Flags::Present))
+					continue;
+				kfree((void*)(pd[pde] & PAGE_MASK));
+			}
+			kfree(pd);
+		}
+		kfree(pdpt);
+	}
+
+	void MMU::load()
+	{
+		asm volatile("movl %0, %%cr3" :: "r"(m_highest_paging_struct));
+	}
+
+	void MMU::map_page_at(paddr_t paddr, vaddr_t vaddr, uint8_t flags)
+	{
+	#if MMU_DEBUG_PRINT
+		dprintln("AllocatePage(0x{8H})", address);
+	#endif
+		ASSERT(flags & Flags::Present);
+
+		ASSERT(!(paddr & ~PAGE_MASK));
+		ASSERT(!(vaddr & ~PAGE_MASK));
+
+		uint32_t pdpte = (vaddr & 0xC0000000) >> 30;
+		uint32_t pde   = (vaddr & 0x3FE00000) >> 21;
+		uint32_t pte   = (vaddr & 0x001FF000) >> 12;
+
+		uint64_t* page_directory = (uint64_t*)(m_highest_paging_struct[pdpte] & PAGE_MASK);
+		if (!(page_directory[pde] & Flags::Present))
+		{
+			uint64_t* page_table = allocate_page_aligned_page();
+			page_directory[pde] = (uint64_t)page_table;
+		}
+		page_directory[pde] |= flags;
+
+		uint64_t* page_table = (uint64_t*)(page_directory[pde] & PAGE_MASK);
+		page_table[pte] = paddr | flags;
+	}
+
+	void MMU::identity_map_page(paddr_t address, uint8_t flags)
+	{
+		address &= PAGE_MASK;
+		map_page_at(address, address, flags);
+	}
+
+	void MMU::identity_map_range(paddr_t address, ptrdiff_t size, uint8_t flags)
+	{
+		paddr_t s_page = address & PAGE_MASK;
+		paddr_t e_page = (address + size - 1) & PAGE_MASK;
+		for (paddr_t page = s_page; page <= e_page; page += PAGE_SIZE)
+			identity_map_page(page, flags);
+	}
+
+	void MMU::unmap_page(vaddr_t address)
+	{
+	#if MMU_DEBUG_PRINT
+		dprintln("UnAllocatePage(0x{8H})", address & PAGE_MASK);
+	#endif
+
+		uint32_t pdpte = (address & 0xC0000000) >> 30;
+		uint32_t pde   = (address & 0x3FE00000) >> 21;
+		uint32_t pte   = (address & 0x001FF000) >> 12;
+
+		uint64_t* page_directory = (uint64_t*)(m_highest_paging_struct[pdpte] & PAGE_MASK);
+		if (!(page_directory[pde] & Flags::Present))
+			return;
+
+		uint64_t* page_table = (uint64_t*)(page_directory[pde] & PAGE_MASK);
+		if (!(page_table[pte] & Flags::Present))
+			return;
+
+		page_table[pte] = 0;
+
+		// TODO: Unallocate the page table if this was the only allocated page
+	}
+
+	void MMU::unmap_range(vaddr_t address, ptrdiff_t size)
+	{
+		uintptr_t s_page = address & PAGE_MASK;
+		uintptr_t e_page = (address + size - 1) & PAGE_MASK;
+		for (uintptr_t page = s_page; page <= e_page; page += PAGE_SIZE)
+			unmap_page(page);
+	}
+
+	uint8_t MMU::get_page_flags(vaddr_t address) const
+	{
+		uint32_t pdpte = (address & 0xC0000000) >> 30;
+		uint32_t pde   = (address & 0x3FE00000) >> 21;
+		uint32_t pte   = (address & 0x001FF000) >> 12;
+
+		uint64_t* page_directory = (uint64_t*)(m_highest_paging_struct[pdpte] & PAGE_MASK);
+		if (!(page_directory[pde] & Flags::Present))
+			return 0;
+
+		uint64_t* page_table = (uint64_t*)(page_directory[pde] & PAGE_MASK);
+		if (!(page_table[pte] & Flags::Present))
+			return 0;
+
+		return page_table[pte] & FLAGS_MASK;
+	}
+
+}

kernel/arch/i386/SpinLock.S

@@ -0,0 +1,19 @@
+.global spinlock_lock_asm
+spinlock_lock_asm:
+	movl 4(%esp), %eax
+	lock; btsl $0, (%eax)
+	jnc .done
+.retry:
+	pause
+	testl $1, (%eax)
+	jne .retry
+	lock; btsl $0, (%eax)
+	jc .retry
+.done:
+	ret
+
+.global spinlock_unlock_asm
+spinlock_unlock_asm:
+	movl 4(%esp), %eax
+	movl $0, (%eax)
+	ret

kernel/arch/i386/Thread.S

@@ -0,0 +1,47 @@
+# uint32_t read_rip()
+.global read_rip
+read_rip:
+	popl %eax
+	jmp *%eax
+
+exit_thread_trampoline:
+	addl $4, %esp
+	pushl (%esp)
+	ret
+
+# void start_thread(uint32_t esp, uint32_t eip)
+.global start_thread
+start_thread:
+	movl 8(%esp), %ecx
+	movl 4(%esp), %esp
+	movl $0, %ebp
+	pushl $exit_thread_trampoline
+	sti
+	jmp *%ecx
+
+# void continue_thread(uint32_t rsp, uint32_t rip)
+.global continue_thread
+continue_thread:
+	movl 8(%esp), %ecx
+	movl 4(%esp), %esp
+	movl $0, %eax
+	jmp *%ecx
+
+# void thread_jump_userspace(uint32_t rsp, uint32_t rip)
+.global thread_jump_userspace
+thread_jump_userspace:
+	movl $0x23, %eax
+	movw %ax, %ds
+	movw %ax, %es
+	movw %ax, %fs
+	movw %ax, %gs
+
+	movl 8(%esp), %ecx
+	movl 4(%esp), %esp
+
+	pushl $0x23
+	pushl %esp
+	pushfl
+	pushl $0x1B
+	pushl %ecx
+	iret