1 files changed, 86 insertions, 0 deletions
diff --git a/dev/Kernel/HALKit/AMD64/HalTimerAMD64.cc b/dev/Kernel/HALKit/AMD64/HalTimerAMD64.cc
new file mode 100644
index 00000000..bedbb237
--- /dev/null
+++ b/dev/Kernel/HALKit/AMD64/HalTimerAMD64.cc
@@ -0,0 +1,86 @@
+/* -------------------------------------------
+
+	Copyright (C) 2024, Amlal EL Mahrouss, all rights reserved.
+
+	File: HalTimer.cc
+	Purpose: HAL timer
+
+	Revision History:
+
+	07/07/24: Added file (amlel)
+
+------------------------------------------- */
+
+#include <Mod/ACPI/ACPIFactoryInterface.h>
+#include <ArchKit/ArchKit.h>
+#include <KernelKit/Timer.h>
+
+// timer slot 0
+
+#define cHPETCounterRegValue   (0x00)
+#define cHPETConfigRegValue	   (0x20)
+#define cHPETCompRegValue	   (0x24)
+#define cHPETInterruptRegValue (0x2C)
+
+///! BUGS: 0
+///! @file HalTimer.cc
+///! @brief Hardware Timer (HPET)
+
+namespace Kernel::Detail
+{
+	struct HPET_BLOCK : public Kernel::SDT
+	{
+		Kernel::UInt8  hardware_rev_id;
+		Kernel::UInt8  comparator_count : 5;
+		Kernel::UInt8  counter_size : 1;
+		Kernel::UInt8  reserved : 1;
+		Kernel::UInt8  legacy_replacement : 1;
+		Kernel::UInt16 pci_vendor_id;
+		ACPI_ADDRESS   address;
+		Kernel::UInt8  hpet_number;
+		Kernel::UInt16 minimum_tick;
+		Kernel::UInt8  page_protection;
+	} PACKED;
+} // namespace Kernel::Detail
+
+using namespace Kernel;
+
+HardwareTimer::HardwareTimer(Int64 ms)
+	: fWaitFor(ms)
+{
+	auto power = PowerFactoryInterface(kHandoverHeader->f_HardwareTables.f_VendorPtr);
+
+	auto hpet = (Detail::HPET_BLOCK*)power.Find("HPET").Leak().Leak();
+	MUST_PASS(hpet);
+
+	fDigitalTimer = (IntPtr*)hpet->address.Address;
+}
+
+HardwareTimer::~HardwareTimer()
+{
+	fDigitalTimer = nullptr;
+	fWaitFor	  = 0;
+}
+
+BOOL HardwareTimer::Wait() noexcept
+{
+	if (fWaitFor < 1)
+		return NO;
+
+	// if not enabled yet.
+	if (!(*(fDigitalTimer + cHPETConfigRegValue) & (1 << 0)))
+	{
+		*(fDigitalTimer + cHPETConfigRegValue) |= (1 << 0); // enable it
+		*(fDigitalTimer + cHPETConfigRegValue) |= (1 << 3); // one shot conf
+	}
+
+	UInt64 ticks = fWaitFor / ((*(fDigitalTimer) >> 32) & __UINT32_MAX__);
+	UInt64 prev	 = *(fDigitalTimer + cHPETCounterRegValue);
+
+	prev += ticks;
+
+	while (*(fDigitalTimer + cHPETCounterRegValue) < (ticks))
+		;
+
+	return YES;
+}