TIMER_MODE
if (port == TIMER_MODE) {
[TIMER_MODE] = vatpit_handler,
outb(TIMER_MODE, TIMER_SEL2 | (mode & 0x3f));
outb(TIMER_MODE, TIMER_SEL2 | TIMER_SQWAVE | TIMER_16BIT);
outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
outb(TIMER_MODE, new_mode);
outb(TIMER_MODE, new_mode);
outb(TIMER_MODE, new_mode);
outb(TIMER_MODE, new_mode);
outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);