ERRCTL_PE
write_c0_errctl(cp0_ectl | ERRCTL_PE);
!(cp0_ectl & ERRCTL_PE)) {
cp0_ectl |= ERRCTL_PE;
cp0_ectl &= ~ERRCTL_PE;
WARN_ON(!!(read_c0_errctl() & ERRCTL_PE) != l1parity);
errctl &= ~(ERRCTL_PE|ERRCTL_L2P);
write_c0_errctl(errctl | ERRCTL_PE);
l1parity_present = (read_c0_errctl() & ERRCTL_PE);
errctl |= ERRCTL_PE;
errctl |= ERRCTL_PE;
str_enabled_disabled(errctl & ERRCTL_PE));