diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt index 441505f56c..14a2c771be 100644 --- a/kernel/CMakeLists.txt +++ b/kernel/CMakeLists.txt @@ -117,9 +117,6 @@ elseif("${BANAN_ARCH}" STREQUAL "i386") set(KERNEL_SOURCES ${KERNEL_SOURCES} arch/i386/boot.S - arch/i386/GDT.cpp - arch/i386/IDT.cpp - arch/i386/MMU.cpp arch/i386/SpinLock.S arch/i386/Thread.S ) diff --git a/kernel/arch/i386/GDT.cpp b/kernel/arch/i386/GDT.cpp deleted file mode 100644 index d5ada22b79..0000000000 --- a/kernel/arch/i386/GDT.cpp +++ /dev/null @@ -1,147 +0,0 @@ -#include -#include - -#include - -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); - } - -} diff --git a/kernel/arch/i386/IDT.cpp b/kernel/arch/i386/IDT.cpp deleted file mode 100644 index 33626a567a..0000000000 --- a/kernel/arch/i386/IDT.cpp +++ /dev/null @@ -1,270 +0,0 @@ -#include -#include -#include -#include -#include -#include - -#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(); - } - -} diff --git a/kernel/arch/i386/MMU.cpp b/kernel/arch/i386/MMU.cpp deleted file mode 100644 index 4946a7eddf..0000000000 --- a/kernel/arch/i386/MMU.cpp +++ /dev/null @@ -1,227 +0,0 @@ -#include -#include -#include -#include - -#include - -#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; - } - -}