IA32_MTRR_ENABLE
if ((defaultType & IA32_MTRR_ENABLE) == 0) {
(defaultType & ~0xff) | IA32_MTRR_ENABLE);
& ~IA32_MTRR_ENABLE;
x86_write_msr(IA32_MSR_MTRR_DEFAULT_TYPE, defaultType | IA32_MTRR_ENABLE);
(defaultType & IA32_MTRR_ENABLE) != 0 ? "en" : "dis");