MP_ISA_BUS
mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
set_bit(MP_ISA_BUS, mp_bus_not_pci);
pr_debug("Bus #%d is ISA (nIRQs: %d)\n", MP_ISA_BUS, nr_legacy_irqs());
if (irq->srcbus == MP_ISA_BUS && irq->srcbusirq == i)
mp_irq.srcbus = MP_ISA_BUS;
mp_irq.srcbus = MP_ISA_BUS;