SLAVE
KASSERT(isrc->is_pic == &atpics[SLAVE].at_pic,
outb(atpics[SLAVE].at_ioaddr, OCW2_EOI);
i8259_init(ap, ap == &atpics[SLAVE]);
if (ap == &atpics[SLAVE] && elcr_found)
i8259_init(&atpics[SLAVE], 1);