ASPEED_VUART_GCRB_HOST_SIRQ_MASK
reg &= ASPEED_VUART_GCRB_HOST_SIRQ_MASK;
if (sirq > (ASPEED_VUART_GCRB_HOST_SIRQ_MASK >> ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT))
sirq &= ASPEED_VUART_GCRB_HOST_SIRQ_MASK;
reg &= ~ASPEED_VUART_GCRB_HOST_SIRQ_MASK;