Kernel: Add function to retrieve boot time as timespec

kernel/kernel/Timer/HPET.cpp

@@ -22,7 +22,10 @@
 #define HPET_Tn_PER_INT_CAP	(1 << 4)
 #define HPET_Tn_VAL_SET_CNF	(1 << 6)
 
-#define FS_PER_MS 1'000'000'000'000
+#define FS_PER_S	1'000'000'000'000'000
+#define FS_PER_MS	1'000'000'000'000
+#define FS_PER_US	1'000'000'000
+#define FS_PER_NS	1'000'000
 
 namespace Kernel
 {
@@ -66,6 +69,18 @@ namespace Kernel
 		m_counter_tick_period_fs = read_register(HPET_REG_CAPABILIES) >> 32;
 
 		uint64_t ticks_per_ms = FS_PER_MS / m_counter_tick_period_fs;
+		
+		{
+			const char* units[] = { "fs", "ps", "ns", "us", "ms", "s" };
+			int index = 0;
+			uint64_t temp = m_counter_tick_period_fs;
+			while (temp >= 1000)
+			{
+				temp /= 1000;
+				index++;
+			}
+			dprintln("HPET percision {} {}", temp, units[index]);
+		}
 
 		uint64_t timer0_config = read_register(HPET_REG_TIMER_CONFIG(0));
 		if (!(timer0_config & HPET_Tn_PER_INT_CAP))
@@ -100,6 +115,15 @@ namespace Kernel
 		return read_register(HPET_REG_COUNTER) * m_counter_tick_period_fs / FS_PER_MS;
 	}
 
+	timespec HPET::time_since_boot() const
+	{
+		uint64_t time_fs = read_register(HPET_REG_COUNTER) * m_counter_tick_period_fs;
+		return timespec {
+			.tv_sec = time_fs / FS_PER_S,
+			.tv_nsec = (long)((time_fs % FS_PER_S) / FS_PER_NS)
+		};
+	}
+
 	void HPET::write_register(ptrdiff_t reg, uint64_t value) const
 	{
 		MMIO::write64(m_mmio_base + reg, value);

kernel/kernel/Timer/PIT.cpp

@@ -21,6 +21,9 @@
 #define BASE_FREQUENCY		1193182
 #define TICKS_PER_SECOND	1000
 
+#define MS_PER_S			1'000
+#define NS_PER_S			1'000'000'000
+
 namespace Kernel
 {
 
@@ -34,7 +37,7 @@ namespace Kernel
 
 	BAN::ErrorOr<BAN::UniqPtr<PIT>> PIT::create()
 	{
-		PIT* pit = new PIT;
+		PIT* pit = new PIT();
 		if (pit == nullptr)
 			return BAN::Error::from_errno(ENOMEM);
 		pit->initialize();
@@ -57,7 +60,16 @@ namespace Kernel
 
 	uint64_t PIT::ms_since_boot() const
 	{
-		return s_system_time;
+		return s_system_time * (MS_PER_S / TICKS_PER_SECOND);
+	}
+
+	timespec PIT::time_since_boot() const
+	{
+		uint64_t ticks = s_system_time;
+		return timespec {
+			.tv_sec = ticks / TICKS_PER_SECOND,
+			.tv_nsec = (long)((ticks % TICKS_PER_SECOND) * (NS_PER_S / TICKS_PER_SECOND))
+		};
 	}
 
 }

kernel/kernel/Timer/Timer.cpp

@@ -59,6 +59,11 @@ namespace Kernel
 		return m_timer->ms_since_boot();
 	}
 
+	timespec TimerHandler::time_since_boot() const
+	{
+		return m_timer->time_since_boot();
+	}
+
 	void TimerHandler::sleep(uint64_t ms) const
 	{
 		if (ms == 0)