-- ./include/sched.h #define HZ 100 -- ./src/process.c #define LATCH (1193180/HZ) static void init_timer() { outb_p(0x36,0x43); outb_p(LATCH & 0xff,0x40); outb(LATCH >> 8,0x40); } add_idt(0x20,&switch_task); outb(inb_p(0x21)&~0x01,0x21);