pci_conf_io
#define PCIOCGETCONF_OLD _IOWR('p', 1, struct pci_conf_io)
struct pci_conf_io *cio;
cio = (struct pci_conf_io *)ap->a_data;
#define PCIOCGETCONF _IOWR('p', 5, struct pci_conf_io)
struct pci_conf_io pc;
bzero(&pc, sizeof(struct pci_conf_io));