PCI_MSI_DATA_32
msi_data_off = PCI_MSI_DATA_32;
reg = ep_func->msi_cap + PCI_MSI_DATA_32;
pci_read_config_word(dev, pos + PCI_MSI_DATA_32, &data);
pci_write_config_word(dev, pos + PCI_MSI_DATA_32, msg->data);
p_setw(perm, PCI_MSI_DATA_32, (u16)ALL_VIRT, (u16)ALL_WRITE);