TCSTATUS_IXMT
tmp |= TCSTATUS_IXMT; /* interrupt exempt */
write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A);
tmp |= TCSTATUS_IXMT; /* interrupt exempt */
tmp |= TCSTATUS_IXMT; /* interrupt exempt */
val = (val & ~(TCSTATUS_DA | TCSTATUS_IXMT)) | TCSTATUS_A;