MD_TCR_FIELDS
if ((tcr & MD_TCR_FIELDS) != TCR_TBI0) {
tcr &= ~MD_TCR_FIELDS;
if ((tcr & MD_TCR_FIELDS) != proc_tcr) {
tcr &= ~MD_TCR_FIELDS;
if ((tcr & MD_TCR_FIELDS) != new_tcr) {
tcr &= ~MD_TCR_FIELDS;
if ((tcr & MD_TCR_FIELDS) != new_tcr) {
tcr &= ~MD_TCR_FIELDS;