LAPIC_MODE_X2APIC
if (old_mode == LAPIC_MODE_X2APIC && new_mode == LAPIC_MODE_XAPIC)
if (old_mode == LAPIC_MODE_DISABLED && new_mode == LAPIC_MODE_X2APIC)
apic_base = APIC_DEFAULT_PHYS_BASE | LAPIC_MODE_X2APIC |
case LAPIC_MODE_X2APIC: