apic_ioapic_read
apic_ioapic_read(ioapic_ix, APIC_RDT_CMD + (2 * (ipin)))
apic_ioapic_read(ioapic_ix, APIC_RDT_CMD2 + (2 * (ipin)))
reg_max = apic_ioapic_read(i, APIC_VERS_CMD);