diff options
| author | Amlal El Mahrouss <amlal@nekernel.org> | 2025-07-21 08:51:41 +0100 |
|---|---|---|
| committer | Amlal El Mahrouss <amlal@nekernel.org> | 2025-07-21 09:07:20 +0100 |
| commit | 4e61e22c3da59b259741e57298725330791aed3e (patch) | |
| tree | b81e078defa58d1fcae570fa72b403606ae596b8 /dev/kernel/HALKit/AMD64 | |
| parent | 1e12163836e649da0d67fc8f17bc9a415554efe4 (diff) | |
feat: NeKernel Semaphore API.
includes:
- New semaphore API for the kernel, we also make use of the HardwareTimer class here.
- Defined header only for now.
- New HAL HW Timer API in AMD64.
Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>
Diffstat (limited to 'dev/kernel/HALKit/AMD64')
| -rw-r--r-- | dev/kernel/HALKit/AMD64/HalTimer.cc | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/dev/kernel/HALKit/AMD64/HalTimer.cc b/dev/kernel/HALKit/AMD64/HalTimer.cc index 13573880..ae3271f6 100644 --- a/dev/kernel/HALKit/AMD64/HalTimer.cc +++ b/dev/kernel/HALKit/AMD64/HalTimer.cc @@ -61,11 +61,8 @@ HardwareTimer::HardwareTimer(UInt64 ms) : fWaitFor(ms) { // if not enabled yet.
if (!(*((volatile UInt64*) ((UInt8*) fDigitalTimer + kHPETConfigRegValue)) & (1 << 0))) {
*((volatile UInt64*) ((UInt8*) fDigitalTimer + kHPETConfigRegValue)) =
- *((volatile UInt64*) ((UInt8*) fDigitalTimer + kHPETConfigRegValue)) |
- (1 << 0); // enable timer
- *((volatile UInt64*) ((UInt8*) fDigitalTimer + kHPETConfigRegValue)) =
- *((volatile UInt64*) ((UInt8*) fDigitalTimer + kHPETConfigRegValue)) |
- (1 << 3); // one shot conf
+ *((volatile UInt64*) ((UInt8*) fDigitalTimer + kHPETConfigRegValue)) | (1 << 0) |
+ (1 << 3); // enable timer
}
}
@@ -80,18 +77,21 @@ HardwareTimer::~HardwareTimer() { 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 + kHPETCounterRegValue));
+ 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 prev = now + (fWaitFor / femtoseconds_per_tick);
+ UInt64 now = *timer;
+
+ UInt64 fs_wait = fWaitFor * 1'000'000'000'000ULL;
+ UInt64 stop_at = now + (fs_wait / femtoseconds_per_tick);
- while (*timer < (prev)) asm volatile("pause");
+ while (*timer < (stop_at)) asm volatile("pause");
return YES;
}
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