TCR_WIE
mtspr(SPRN_TCR, mfspr(SPRN_TCR) & ~TCR_WIE);
if ((vcpu->arch.tcr & TCR_WIE) && (vcpu->arch.tsr & TSR_WIS))
val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(sec_to_period(wdog->timeout)));
val &= ~(TCR_WIE | WDTP_MASK);