k-chow/k/events/pic/pit.c

#include "pit.h"
#include "io.h"
#include "stdio.h"

static unsigned long ticks = 0;

void pit_handler(void)
{
    ++ticks;
}

unsigned long gettick(void)
{
    return ticks;
}

void init_pit(void)
{
    outb(PIT_CONTROL_REG, PIT_MODE_2 | PIT_RW_LSB | PIT_RW_MSB);

    outb(PIT_COUNTER_0, PIT_DIVIDER & 0xff);
    outb(PIT_COUNTER_0, PIT_DIVIDER >> 8);
}