PCICONF_BUS_DEVICE
pd = PCICONF_BUS_DEVICE(pb, devno, funcno);
pd = PCICONF_BUS_DEVICE(pb, devno, 0);
pd = PCICONF_BUS_DEVICE(parent_bus, devno, funcno);
pd = PCICONF_BUS_DEVICE(pb, devno, funcno);