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KimisOS
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Chose a good frequency

This commit is contained in:
notsomeidiot123 2025-09-21 09:22:25 -04:00
parent 09fa845774
commit 85aadeb902
1 changed files with 13 additions and 3 deletions
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16
src/kernel/arch_i386/interrupts.c
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@ -128,16 +128,25 @@ void pit_reload(uint8_t mode, uint16_t reload){
outb(PIT_DATA, reload & 0xff); outb(PIT_DATA, reload & 0xff);
return; return;
} }
void pit_init(uint32_t freq){ uint32_t pit_init(uint32_t freq){
uint32_t reload_value = 0x10000; uint32_t reload_value = 0x10000;
if(freq <= 18){ if(freq <= 18){
pit_reload(0b100, reload_value); pit_reload(0b100, reload_value);
uint32_t ms = (reload_value * 3000)/3579545;
return ms;
} }
if(freq >= 1193181){ if(freq >= 1193181){
pit_reload(0b100, reload_value >> 16); pit_reload(0b100, reload_value >> 16);
uint32_t ms = (reload_value * 3000)/3579545;
return ms;
} }
reload_value = ((3579545 * 256)/(3 * 256))/(freq);
reload_value = ((3579545)/(freq));
reload_value /= 3;
pit_reload(0b100, reload_value); pit_reload(0b100, reload_value);
printf("%d\n", reload_value);
uint32_t ms = (reload_value * 3000)/3579545;
return ms;
} }
void idt_load(){ void idt_load(){
@ -190,7 +199,8 @@ void idt_load(){
interrupt_handlers[i] = 0; interrupt_handlers[i] = 0;
} }
pit_init(1193181); uint32_t hz_ms = pit_init(50000);
printf("%d\n", hz_ms);
// asm volatile("lidt (%0)" : : "m"(&idt_desc)); // asm volatile("lidt (%0)" : : "m"(&idt_desc));
// outb(0x20, 0x11 ); // outb(0x20, 0x11 );
// outb(0xa0, 0x11); // outb(0xa0, 0x11);