MTRR_TYPE_WT
mtrrp->type = MTRR_TYPE_WT;
case MTRR_TYPE_WT:
if ((type1 == MTRR_TYPE_WT && type2 == MTRR_TYPE_WB) ||
(type1 == MTRR_TYPE_WB && type2 == MTRR_TYPE_WT))