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scheduler timer

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abstraction of a timer that is local to each cpu and is used for scheduling
This commit is contained in:
Matheus
2022-08-07 12:50:17 -03:00
parent 50243cc540
commit 1a2486cadd
12 changed files with 107 additions and 11 deletions
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src/arch/x86_64/apic.c
+36 -3
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@@ -9,7 +9,10 @@
#define APIC_REGISTER_ID 0x20
#define APIC_REGISTER_EOI 0xB0
#define APIC_REGISTER_SPURIOUS 0xF0
#define APIC_TIMER_LVT 0x320
#define APIC_TIMER_INITIALCOUNT 0x380
#define APIC_TIMER_COUNT 0x390
#define APIC_TIMER_DIVIDE 0x3E0
#define TYPE_LAPIC 0
#define TYPE_IOAPIC 1
@@ -148,11 +151,38 @@ static void ioapic_writeiored(ioapic_descriptor* ioapic, uint8_t irq, uint8_t ve
}
static inline uint32_t lapic_readreg(size_t reg){
return *(uint32_t* volatile)(lapicaddr + reg);
return *(uint32_t volatile*)(lapicaddr + reg);
}
static inline void lapic_writereg(size_t reg, uint32_t data){
*(uint32_t* volatile)(lapicaddr + reg) = data;
*(uint32_t volatile*)(lapicaddr + reg) = data;
}
void apic_timerstart(size_t ticks){
lapic_writereg(APIC_TIMER_INITIALCOUNT, ticks);
}
void apic_timerinterruptset(uint8_t vector){
lapic_writereg(APIC_TIMER_LVT, vector);
}
void apic_timerstop(){
lapic_writereg(APIC_TIMER_INITIALCOUNT, 0);
}
size_t apic_timercalibrate(size_t ms){
lapic_writereg(APIC_TIMER_INITIALCOUNT, 0xFFFFFFFF);
lapic_writereg(APIC_TIMER_DIVIDE, 0b111); // no divider
hpet_wait_ms(ms);
size_t ticks = 0xFFFFFFFF - lapic_readreg(APIC_TIMER_COUNT);
apic_timerstop();
return ticks;
}
void apic_lapicinit(){
@@ -161,7 +191,10 @@ void apic_lapicinit(){
arch_getcls()->lapicid >>= 24;
lapic_writereg(APIC_REGISTER_SPURIOUS, 0x1FF);
lapic_writereg(APIC_TIMER_LVT, 1 << 16); // mask timer interrupt off
}
void apic_init(){