BarinkOS/source/kernel/timer.cpp

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#include "timer.h"
uint32_t tick = 0;
static void timer_callback (registers_t regs ){
tick ++ ;
kterm_writestring ("tick passed!");
}
void init_timer (uint32_t frequency){
// register timer callback
uint32_t divisor = 1193180 / frequency;
// Send the commmand byte
outb(0x43, 0x36);
// Divisor has to be sent byt-wise , so will send lower then upper bytes
uint8_t low = (uint8_t) (divisor & 0xFF);
uint8_t high = (uint8_t) ((divisor >> 8) & 0xFF);
outb(0x40, low);
outb(0x40, high);
}