APIC_ID_MASK
vioapic->id = data & APIC_ID_MASK;
#define IOART_DEST APIC_ID_MASK /* broadcast addr: all APICs */
high = intpin->io_cpu << APIC_ID_SHIFT & APIC_ID_MASK;
(dest & ~(APIC_ID_MASK >> APIC_ID_SHIFT)) == 0,
(dest & ~(APIC_ID_MASK >> APIC_ID_SHIFT)) == 0,