PCI_CB_IOBASE0
io = pci_conf_read(pc, tag, PCI_CB_IOBASE0);
PCI_CB_IOBASE0, io, limit);
basereg = win * 8 + PCI_CB_IOBASE0;
basereg = win * 8 + PCI_CB_IOBASE0;
offs = PCI_CB_IOBASE0;
pci_conf_write(pc, tag, PCI_CB_IOBASE0, 0xffffffff);