Kernel: Move RTC to Timer directory

PIT ms counter seems to be off by multiple seconds/minute. I will
be probably changing to HPET for system time

kernel/CMakeLists.txt

@@ -41,7 +41,6 @@ set(KERNEL_SOURCES
 	kernel/PCI.cpp
 	kernel/PIC.cpp
 	kernel/Process.cpp
-	kernel/RTC.cpp
 	kernel/Scheduler.cpp
 	kernel/Semaphore.cpp
 	kernel/Serial.cpp
@@ -58,6 +57,7 @@ set(KERNEL_SOURCES
 	kernel/Terminal/VesaTerminalDriver.cpp
 	kernel/Thread.cpp
 	kernel/Timer/PIT.cpp
+	kernel/Timer/RTC.cpp
 	kernel/Timer/Timer.cpp
 	icxxabi.cpp
 )

kernel/include/kernel/RTC.h

@@ -1,10 +0,0 @@
-#pragma once
-
-#include <BAN/Time.h>
-
-namespace RTC
-{
-
-	BAN::Time get_current_time();
-
-}

kernel/include/kernel/Timer/RTC.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <BAN/Time.h>
+
+namespace Kernel
+{
+
+	class RTC
+	{
+	public:
+		BAN::Time get_current_time();
+	
+	private:
+		bool is_update_in_progress();
+		uint8_t read_register8(uint8_t reg);
+		void get_time(BAN::Time& out);
+	};
+
+}

kernel/include/kernel/Timer/Timer.h

@@ -2,6 +2,7 @@
 
 #include <BAN/UniqPtr.h>
 #include <BAN/Vector.h>
+#include <kernel/Timer/RTC.h>
 
 namespace Kernel
 {
@@ -24,12 +25,16 @@ namespace Kernel
 		uint64_t ms_since_boot() const;
 		void sleep(uint64_t) const;
 
+		uint64_t get_unix_timestamp();
+
 	private:
 		TimerHandler() = default;
 
 		void initialize_timers();
 
 	private:
+		uint64_t m_boot_time { 0 };
+		BAN::UniqPtr<RTC> m_rtc;
 		BAN::Vector<BAN::UniqPtr<Timer>> m_timers;
 	};
 

kernel/kernel/FS/Ext2.cpp

@@ -1,7 +1,7 @@
 #include <BAN/ScopeGuard.h>
 #include <BAN/StringView.h>
 #include <kernel/FS/Ext2.h>
-#include <kernel/RTC.h>
+#include <kernel/Timer/Timer.h>
 
 #define EXT2_DEBUG_PRINT 0
 #define VERIFY_INODE_EXISTANCE 1
@@ -384,7 +384,7 @@ namespace Kernel
 		if (error_or.error().get_error_code() != ENOENT)
 			return error_or.error();
 
-		uint64_t current_time = BAN::to_unix_time(RTC::get_current_time());
+		uint64_t current_time = TimerHandler::get().get_unix_timestamp();
 
 		Ext2::Inode ext2_inode;
 		ext2_inode.mode			= mode;

kernel/kernel/FS/Pipe.cpp

@@ -1,6 +1,6 @@
 #include <kernel/FS/Pipe.h>
 #include <kernel/LockGuard.h>
-#include <kernel/RTC.h>
+#include <kernel/Timer/Timer.h>
 
 namespace Kernel
 {
@@ -17,7 +17,7 @@ namespace Kernel
 		: m_uid(credentials.euid())
 		, m_gid(credentials.egid())
 	{
-		uint64_t current_time = BAN::to_unix_time(RTC::get_current_time());
+		uint64_t current_time = TimerHandler::get().get_unix_timestamp();
 		m_atime = { .tv_sec = current_time, .tv_nsec = 0 };
 		m_mtime = { .tv_sec = current_time, .tv_nsec = 0 };
 		m_ctime = { .tv_sec = current_time, .tv_nsec = 0 };
@@ -57,7 +57,7 @@ namespace Kernel
 		memmove(m_buffer.data(), m_buffer.data() + to_copy, m_buffer.size() - to_copy);
 		MUST(m_buffer.resize(m_buffer.size() - to_copy));
 
-		uint64_t current_time = BAN::to_unix_time(RTC::get_current_time());
+		uint64_t current_time = TimerHandler::get().get_unix_timestamp();
 		m_atime = { .tv_sec = current_time, .tv_nsec = 0 };
 
 		m_semaphore.unblock();
@@ -76,7 +76,7 @@ namespace Kernel
 		TRY(m_buffer.resize(old_size + count));
 		memcpy(m_buffer.data() + old_size, buffer, count);
 
-		uint64_t current_time = BAN::to_unix_time(RTC::get_current_time());
+		uint64_t current_time = TimerHandler::get().get_unix_timestamp();
 		m_mtime = { .tv_sec = current_time, .tv_nsec = 0 };
 		m_ctime = { .tv_sec = current_time, .tv_nsec = 0 };
 

kernel/kernel/FS/RamFS/FileSystem.cpp

@@ -2,7 +2,6 @@
 #include <kernel/FS/RamFS/FileSystem.h>
 #include <kernel/FS/RamFS/Inode.h>
 #include <kernel/LockGuard.h>
-#include <kernel/RTC.h>
 
 namespace Kernel
 {

kernel/kernel/FS/RamFS/Inode.cpp

@@ -1,6 +1,6 @@
 #include <kernel/FS/RamFS/FileSystem.h>
 #include <kernel/FS/RamFS/Inode.h>
-#include <kernel/RTC.h>
+#include <kernel/Timer/Timer.h>
 
 namespace Kernel
 {
@@ -23,7 +23,7 @@ namespace Kernel
 	RamInode::RamInode(RamFileSystem& fs, mode_t mode, uid_t uid, gid_t gid)
 			: m_fs(fs)
 	{
-		uint64_t current_unix_time = BAN::to_unix_time(RTC::get_current_time());
+		uint64_t current_unix_time = TimerHandler::get().get_unix_timestamp();
 		timespec current_timespec;
 		current_timespec.tv_sec = current_unix_time;
 		current_timespec.tv_nsec = 0;

kernel/kernel/Input/PS2Keyboard.cpp

@@ -2,6 +2,7 @@
 #include <kernel/CriticalScope.h>
 #include <kernel/FS/DevFS/FileSystem.h>
 #include <kernel/Input/PS2Keyboard.h>
+#include <kernel/Timer/Timer.h>
 
 #include <sys/sysmacros.h>
 

kernel/kernel/Timer/RTC.cpp

@@ -1,5 +1,5 @@
 #include <kernel/IO.h>
-#include <kernel/RTC.h>
+#include <kernel/Timer/RTC.h>
 
 #include <string.h>
 
@@ -18,38 +18,38 @@
 #define CMOS_REGISTER_STATUS_1	0x0A
 #define CMOS_REGISTER_STATUS_2	0x0B
 
-namespace RTC
+namespace Kernel
 {
 
-	static bool get_update_in_progress()
+	bool RTC::is_update_in_progress()
 	{
 		IO::outb(CMOS_ADDRESS, CMOS_REGISTER_STATUS_1);
 		return IO::inb(CMOS_DATA) & 0x80;
 	}
 
-	static uint8_t get_rtc_register(uint8_t reg)
+	uint8_t RTC::read_register8(uint8_t reg)
 	{
 		IO::outb(CMOS_ADDRESS, reg);
 		return IO::inb(CMOS_DATA);
 	}
 
-	static void get_time(BAN::Time& out)
+	void RTC::get_time(BAN::Time& out)
 	{
-		out.second		= get_rtc_register(CMOS_REGISTER_SECOND);
-		out.minute		= get_rtc_register(CMOS_REGISTER_MINUTE);
-		out.hour		= get_rtc_register(CMOS_REGISTER_HOUR);
-		out.week_day	= get_rtc_register(CMOS_REGISTER_WEEK_DAY);
-		out.day			= get_rtc_register(CMOS_REGISTER_DAY);
-		out.month		= get_rtc_register(CMOS_REGISTER_MONTH);
-		out.year		= get_rtc_register(CMOS_REGISTER_YEAR);
+		out.second		= read_register8(CMOS_REGISTER_SECOND);
+		out.minute		= read_register8(CMOS_REGISTER_MINUTE);
+		out.hour		= read_register8(CMOS_REGISTER_HOUR);
+		out.week_day	= read_register8(CMOS_REGISTER_WEEK_DAY);
+		out.day			= read_register8(CMOS_REGISTER_DAY);
+		out.month		= read_register8(CMOS_REGISTER_MONTH);
+		out.year		= read_register8(CMOS_REGISTER_YEAR);
 	}
 
-	BAN::Time get_current_time()
+	BAN::Time RTC::get_current_time()
 	{
 		BAN::Time last_time	= {};
 		BAN::Time time		= {};
 
-		while (get_update_in_progress())
+		while (is_update_in_progress())
 			continue;
 
 		get_time(time);
@@ -61,18 +61,18 @@ namespace RTC
 			get_time(time);
 		}
 		
-		uint8_t regB = get_rtc_register(0x0B);
+		uint8_t regB = read_register8(0x0B);
 
 		// Convert BCD to binary values if necessary
 		if (!(regB & 0x04))
 		{
-            time.second		=  (time.second		& 0x0F) + ((time.second		/ 16) * 10);
-            time.minute		=  (time.minute		& 0x0F) + ((time.minute		/ 16) * 10);
-            time.hour		= ((time.hour		& 0x0F) + (((time.hour & 0x70) / 16) * 10) ) | (time.hour & 0x80);
-            time.week_day	=  (time.week_day	& 0x0F) + ((time.week_day	/ 16) * 10);
-            time.day		=  (time.day		& 0x0F) + ((time.day		/ 16) * 10);
-            time.month		=  (time.month		& 0x0F) + ((time.month		/ 16) * 10);
-            time.year		=  (time.year		& 0x0F) + ((time.year		/ 16) * 10);
+			time.second		=  (time.second		& 0x0F) + ((time.second		/ 16) * 10);
+			time.minute		=  (time.minute		& 0x0F) + ((time.minute		/ 16) * 10);
+			time.hour		= ((time.hour		& 0x0F) + (((time.hour & 0x70) / 16) * 10) ) | (time.hour & 0x80);
+			time.week_day	=  (time.week_day	& 0x0F) + ((time.week_day	/ 16) * 10);
+			time.day		=  (time.day		& 0x0F) + ((time.day		/ 16) * 10);
+			time.month		=  (time.month		& 0x0F) + ((time.month		/ 16) * 10);
+			time.year		=  (time.year		& 0x0F) + ((time.year		/ 16) * 10);
 		}
 
 		// Convert 12 hour clock to 24 hour clock if necessary

kernel/kernel/Timer/Timer.cpp

@@ -9,9 +9,10 @@ namespace Kernel
 	void TimerHandler::initialize()
 	{
 		ASSERT(s_instance == nullptr);
-		s_instance = new TimerHandler;
-		ASSERT(s_instance);
-		s_instance->initialize_timers();
+		auto* temp = new TimerHandler;
+		ASSERT(temp);
+		temp->initialize_timers();
+		s_instance = temp;
 	}
 
 	TimerHandler& TimerHandler::get()
@@ -27,6 +28,9 @@ namespace Kernel
 
 	void TimerHandler::initialize_timers()
 	{
+		m_rtc = MUST(BAN::UniqPtr<RTC>::create());
+		m_boot_time = BAN::to_unix_time(m_rtc->get_current_time());
+
 		if (auto res = PIT::create(); res.is_error())
 			dwarnln("PIT: {}", res.error());
 		else
@@ -48,4 +52,9 @@ namespace Kernel
 		return m_timers.front()->sleep(ms);
 	}
 
+	uint64_t TimerHandler::get_unix_timestamp()
+	{
+		return m_boot_time + ms_since_boot() / 1000;
+	}
+
 }

kernel/kernel/kernel.cpp

@@ -138,6 +138,15 @@ extern "C" void kernel_main()
 	ASSERT(terminal_driver);
 	dprintln("VESA initialized");
 
+	MUST(ACPI::initialize());
+	dprintln("ACPI initialized");
+
+	InterruptController::initialize(cmdline.force_pic);
+	dprintln("Interrupt controller initialized");
+
+	TimerHandler::initialize();
+	dprintln("Timers initialized");
+
 	DevFileSystem::initialize();
 	dprintln("devfs initialized");
 
@@ -148,15 +157,6 @@ extern "C" void kernel_main()
 	parse_command_line();
 	dprintln("command line parsed, root='{}'", cmdline.root);
 
-	MUST(ACPI::initialize());
-	dprintln("ACPI initialized");
-
-	InterruptController::initialize(cmdline.force_pic);
-	dprintln("Interrupt controller initialized");
-
-	TimerHandler::initialize();
-	dprintln("Timers initialized");
-
 	MUST(Scheduler::initialize());
 	dprintln("Scheduler initialized");