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Spinlock save cpu flags

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This commit is contained in:
Kamil Kowalczyk
2026-03-12 22:48:34 +01:00
parent 19793e9126
commit 4760818118
50 changed files with 704 additions and 461 deletions
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18
kernel/amd64/apic.c
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@@ -57,19 +57,23 @@ static spin_lock_t lapic_calibration_lock = SPIN_LOCK_INIT;
/* Read IOAPIC */
static uint32_t ioapic_read (struct ioapic* ioapic, uint32_t reg) {
spin_lock (&ioapic->lock);
uint64_t fia;
spin_lock (&ioapic->lock, &fia);
*(volatile uint32_t*)ioapic->mmio_base = reg;
uint32_t ret = *(volatile uint32_t*)(ioapic->mmio_base + 0x10);
spin_unlock (&ioapic->lock);
spin_unlock (&ioapic->lock, fia);
return ret;
}
/* Write IOAPIC */
static void ioapic_write (struct ioapic* ioapic, uint32_t reg, uint32_t value) {
spin_lock (&ioapic->lock);
uint64_t fia;
spin_lock (&ioapic->lock, &fia);
*(volatile uint32_t*)ioapic->mmio_base = reg;
*(volatile uint32_t*)(ioapic->mmio_base + 0x10) = value;
spin_unlock (&ioapic->lock);
spin_unlock (&ioapic->lock, fia);
}
/* Find an IOAPIC corresposting to provided IRQ */
@@ -197,7 +201,9 @@ void lapic_eoi (void) { lapic_write (LAPIC_EOI, 0); }
* us - Period length in microseconds
*/
static uint32_t lapic_calibrate (uint32_t us) {
spin_lock (&lapic_calibration_lock);
uint64_t flc;
spin_lock (&lapic_calibration_lock, &flc);
lapic_write (LAPIC_DCR, DIVIDER_VALUE);
@@ -210,7 +216,7 @@ static uint32_t lapic_calibrate (uint32_t us) {
uint32_t ticks = 0xFFFFFFFF - lapic_read (LAPIC_TIMCCT);
DEBUG ("timer ticks = %u\n", ticks);
spin_unlock (&lapic_calibration_lock);
spin_unlock (&lapic_calibration_lock, flc);
return ticks;
}