MTRR_DEF_TYPE_ENABLE
#define MTRR_DEF_TYPE_DISABLE ~(MTRR_DEF_TYPE_TYPE | MTRR_DEF_TYPE_ENABLE)
mtrr_state.enabled = (lo & MTRR_DEF_TYPE_ENABLE) >> MTRR_STATE_SHIFT;
((deftype_lo & MTRR_DEF_TYPE_ENABLE) >> MTRR_STATE_SHIFT) != mtrr_state.enabled) {