diff options
| author | Amlal El Mahrouss <amlal@nekernel.org> | 2025-11-23 21:06:27 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-11-23 21:06:27 -0500 |
| commit | 23040fad647634c08697451fc22ee2ca999629c8 (patch) | |
| tree | 72888f88c7728c82f3f6df1f4f70591de15eab36 /src/kernel/HALKit/AMD64/HalTimer.cc | |
| parent | e5cc7351f0577b54c528fb827a7c7e6306c3e843 (diff) | |
| parent | 83d870e58457a1d335a1d9b9966a6a1887cc297b (diff) | |
Merge pull request #81 from nekernel-org/dev
feat! breaking changes on kernel sources.
Diffstat (limited to 'src/kernel/HALKit/AMD64/HalTimer.cc')
| -rw-r--r-- | src/kernel/HALKit/AMD64/HalTimer.cc | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/kernel/HALKit/AMD64/HalTimer.cc b/src/kernel/HALKit/AMD64/HalTimer.cc new file mode 100644 index 00000000..f6488b05 --- /dev/null +++ b/src/kernel/HALKit/AMD64/HalTimer.cc @@ -0,0 +1,101 @@ +/* ========================================
+
+ Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
+
+ File: HalTimer.cc
+ Purpose: HAL timer
+
+ Revision History:
+
+ 07/07/24: Added file (amlel)
+
+======================================== */
+
+#include <ArchKit/ArchKit.h>
+#include <KernelKit/Timer.h>
+#include <modules/ACPI/ACPIFactoryInterface.h>
+
+/// ================================================================================
+/// @note timer slot 0
+/// ================================================================================
+
+#define kHPETSignature ("HPET")
+
+#define kHPETCounterRegValue (0x00)
+#define kHPETConfigRegValue (0x20)
+#define kHPETCompRegValue (0x24)
+#define kHPETInterruptRegValue (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(UInt64 ms) : fWaitFor(ms) {
+ auto power = PowerFactoryInterface(kHandoverHeader->f_HardwareTables.f_VendorPtr);
+
+ auto hpet = (Detail::HPET_BLOCK*) power.Find(kHPETSignature).Leak().Leak();
+ MUST_PASS(hpet);
+
+ fDigitalTimer = (UInt8*) hpet->address.Address;
+
+ if (hpet->page_protection) {
+ HAL::mm_map_page((VoidPtr) fDigitalTimer, (VoidPtr) fDigitalTimer,
+ HAL::kMMFlagsWr | HAL::kMMFlagsPCD | HAL::kMMFlagsPwt);
+ }
+
+ // if not enabled yet.
+ if (!(*((volatile UInt64*) ((UInt8*) fDigitalTimer + kHPETConfigRegValue)) & (1 << 0))) {
+ *((volatile UInt64*) ((UInt8*) fDigitalTimer + kHPETConfigRegValue)) =
+ *((volatile UInt64*) ((UInt8*) fDigitalTimer + kHPETConfigRegValue)) | (1 << 0) |
+ (1 << 3); // enable timer & one shot conf
+ }
+}
+
+HardwareTimer::~HardwareTimer() {
+ fDigitalTimer = nullptr;
+ fWaitFor = 0;
+}
+
+/***********************************************************************************/
+/// @brief Wait for the timer to stop spinning.
+/***********************************************************************************/
+
+BOOL HardwareTimer::Wait() noexcept {
+ if (fWaitFor < 1) return NO;
+ if (fWaitFor > 1'000'000) return NO; // max 1000s = 16 minutes
+
+ UInt64 hpet_cap = *((volatile UInt64*) (fDigitalTimer));
+ UInt64 femtoseconds_per_tick = (hpet_cap >> 32);
+
+ if (femtoseconds_per_tick == 0) return NO;
+
+ volatile UInt64* timer = (volatile UInt64*) (fDigitalTimer + kHPETCounterRegValue);
+
+ UInt64 now = *timer;
+
+ UInt64 fs_wait = fWaitFor * 1'000'000'000'000ULL;
+ UInt64 stop_at = now + (fs_wait / femtoseconds_per_tick);
+
+ while (*timer < (stop_at)) asm volatile("pause");
+
+ return YES;
+}
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