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Implement lock IRQ nesting via stack variables/contexts
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This commit is contained in:
Kamil Kowalczyk
2026-01-14 22:11:56 +01:00
parent 55166f9d5f
commit 270ff507d4
22 changed files with 197 additions and 145 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 amd64_ioapic_read (struct ioapic* ioapic, uint32_t reg) {
rw_spin_read_lock (&ioapic->lock);
spin_lock_ctx_t ctxioar;
rw_spin_read_lock (&ioapic->lock, &ctxioar);
*(volatile uint32_t*)ioapic->mmio_base = reg;
uint32_t ret = *(volatile uint32_t*)(ioapic->mmio_base + 0x10);
rw_spin_read_unlock (&ioapic->lock);
rw_spin_read_unlock (&ioapic->lock, &ctxioar);
return ret;
}
/* Write IOAPIC */
static void amd64_ioapic_write (struct ioapic* ioapic, uint32_t reg, uint32_t value) {
rw_spin_write_lock (&ioapic->lock);
spin_lock_ctx_t ctxioaw;
rw_spin_write_lock (&ioapic->lock, &ctxioaw);
*(volatile uint32_t*)ioapic->mmio_base = reg;
*(volatile uint32_t*)(ioapic->mmio_base + 0x10) = value;
rw_spin_write_unlock (&ioapic->lock);
rw_spin_write_unlock (&ioapic->lock, &ctxioaw);
}
/* Find an IOAPIC corresposting to provided IRQ */
@@ -201,7 +205,9 @@ void amd64_lapic_eoi (void) { amd64_lapic_write (LAPIC_EOI, 0); }
* us - Period length in microseconds
*/
static uint32_t amd64_lapic_calibrate (uint32_t us) {
spin_lock (&lapic_calibration_lock);
spin_lock_ctx_t ctxlacb;
spin_lock (&lapic_calibration_lock, &ctxlacb);
amd64_lapic_write (LAPIC_DCR, DIVIDER_VALUE);
@@ -214,7 +220,7 @@ static uint32_t amd64_lapic_calibrate (uint32_t us) {
uint32_t ticks = 0xFFFFFFFF - amd64_lapic_read (LAPIC_TIMCCT);
DEBUG ("timer ticks = %u\n", ticks);
spin_unlock (&lapic_calibration_lock);
spin_unlock (&lapic_calibration_lock, &ctxlacb);
return ticks;
}