ST0_MX
status_set |= ST0_MX;
change_c0_status(ST0_CU|ST0_MX|ST0_RE|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX,
UASM_i_LA(&p, GPR_AT, ~(ST0_CU0 | ST0_MX | ST0_SX | ST0_UX));
status |= (ST0_MX);