APICID_TO_CPUID
if (APICID_TO_CPUID(i) == -1)
APICID_TO_CPUID(i) = -1;
APICID_TO_CPUID(apic_id) = cpu_id;
return APICID_TO_CPUID(apicid);
cpu_id = APICID_TO_CPUID(LAPIC_READID);