PCI_MSI_MDATA64
pci_conf_write(pc, tag, off + PCI_MSI_MDATA64, data);
pci_conf_write(pc, tag, off + PCI_MSI_MDATA64, data);
pci_conf_write(pc, tag, off + PCI_MSI_MDATA64, data);
pci_conf_write(pc, tag, off + PCI_MSI_MDATA64, data);
off + (bit64 ? PCI_MSI_MDATA64 : PCI_MSI_MDATA));
off + (bit64 ? PCI_MSI_MDATA64 : PCI_MSI_MDATA),