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interrupts

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Andreas Abel
2021-12-22 20:43:57 +01:00
parent 1b69fd34bd
commit 632cbff848
1 changed files with 12 additions and 3 deletions
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15
kernel/nb_km.c
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@@ -506,6 +506,7 @@ uint32_t prev_LVTPC = 0;
uint32_t prev_LVT0 = 0;
uint32_t prev_LVT1 = 0;
uint32_t prev_LVTERR = 0;
uint32_t prev_APIC_TMICT = 0;
uint64_t prev_deadline = 0;
static void restore_interrupts_preemption(void) {
@@ -515,8 +516,12 @@ static void restore_interrupts_preemption(void) {
apic_write(APIC_LVT0, prev_LVT0);
apic_write(APIC_LVT1, prev_LVT1);
apic_write(APIC_LVTERR, prev_LVTERR);
if (supports_tsc_deadline) write_msr(MSR_IA32_TSC_DEADLINE, prev_deadline);
prev_LVTT = prev_LVTTHMR = prev_LVTPC = prev_LVT0 = prev_LVT1 = prev_LVTERR = prev_deadline = 0;
apic_write(APIC_TMICT, prev_APIC_TMICT);
if (supports_tsc_deadline) {
asm volatile("mfence");
write_msr(MSR_IA32_TSC_DEADLINE, max(1ULL, prev_deadline));
}
prev_LVTT = prev_LVTTHMR = prev_LVTPC = prev_LVT0 = prev_LVT1 = prev_LVTERR = prev_APIC_TMICT = prev_deadline = 0;
put_cpu();
}
@@ -539,7 +544,11 @@ static void disable_interrupts_preemption(void) {
prev_LVT0 = apic_read(APIC_LVT0);
prev_LVT1 = apic_read(APIC_LVT1);
prev_LVTERR = apic_read(APIC_LVTERR);
if (supports_tsc_deadline) prev_deadline = read_msr(MSR_IA32_TSC_DEADLINE);
prev_APIC_TMICT = apic_read(APIC_TMICT);
if (supports_tsc_deadline) {
prev_deadline = read_msr(MSR_IA32_TSC_DEADLINE);
write_msr(MSR_IA32_TSC_DEADLINE, 0);
}
apic_write(APIC_LVTT, prev_LVTT | APIC_LVT_MASKED);
apic_write(APIC_LVTTHMR, prev_LVTTHMR | APIC_LVT_MASKED);