PCIM_MSICTRL_MME_MASK
ctrl &= ~PCIM_MSICTRL_MME_MASK;
msi->msi_ctrl &= ~PCIM_MSICTRL_MME_MASK;
rwmask = PCIM_MSICTRL_MME_MASK | PCIM_MSICTRL_MSI_ENABLE;
mme = msgctrl & PCIM_MSICTRL_MME_MASK;
msgnum = 1 << ((ctrl & PCIM_MSICTRL_MME_MASK) >> 4);