| #include "timer.h" | |
| #include "io.h" | |
| #include "log.h" | |
| #include "pic.h" | |
| #include "registers.h" | |
| #include "task.h" | |
| static ulong tick = 0; | |
| static void timer_cb(struct registers *regs) | |
| { | |
| if (tasks_initialized) | |
| { | |
| // Preemptive multitasking! | |
| switch_task(); | |
| } | |
| } | |
| void init_timer(uint hz) | |
| { | |
| add_interrupt_handler(IRQ_TO_INT(0), timer_cb); | |
| uint divisor = TIMER_FREQ / hz; | |
| outb(0x43, 0x36); | |
| uchar l = divisor & 0xff, h = (divisor >> 8) & 0xff; | |
| outb(0x40, l); | |
| outb(0x40, h); | |
| } |