ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT
reg >>= ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT;
if (sirq > (ASPEED_VUART_GCRB_HOST_SIRQ_MASK >> ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT))
sirq <<= ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT;