MSR_X2APIC_BASE
movl $(MSR_X2APIC_BASE + MSR_X2APIC_EOI),%ecx ; \
movl $(MSR_X2APIC_BASE + MSR_X2APIC_EOI),%ecx ; \
return rdmsr(MSR_X2APIC_BASE + (reg >> 4));
wrmsr(MSR_X2APIC_BASE + (reg >> 4), val);
wrmsr(MSR_X2APIC_BASE + (reg >> 4), val);