#include <_stdio.h> #include <interrupts.h> #include <irqs.h> #include <ports.h> #include <stdint.h> #include <task.h> #define PIT_A 0x40 #define PIT_CONTROL 0x43 #define PIT_MASK 0xFF #define PIT_SCALE 1193180 #define PIT_SET 0x36 #define CMD_BINARY 0x00 #define CMD_MODE0 0x00 #define CMD_MODE1 0x02 #define CMD_MODE2 0x04 #define CMD_MODE3 0x06 #define CMD_MODE4 0x08 #define CMD_MODE5 0x0a #define CMD_RW_BOTH 0x30 #define CMD_COUNTER0 0x00 #define CMD_COUNTER2 0x80 void setTimerFreq(uint32_t hz) { int divisor = PIT_SCALE / hz; outb(PIT_CONTROL, CMD_BINARY | CMD_MODE3 | CMD_RW_BOTH | CMD_COUNTER0); outb(PIT_A, (uint8_t)divisor); outb(PIT_A, (uint8_t)(divisor >> 8)); } uint32_t timerMillis = 0; uint32_t time = 0; void timerHandler() { timerMillis++; if (timerMillis % 1000 == 0) { printf("\e[s\e[Htime since power on :0x%x seconds\e[u", ++time); } } void setupTimer() { printf("setting timer frequency to 1kHz\n"); setTimerFreq(1000); setIRQHandler(0, &timerHandler); }