PCIR_INTPIN
pci_write_config(dev, PCIR_INTPIN, dinfo->cfg.intpin, 1);
dinfo->cfg.intpin = pci_read_config(dev, PCIR_INTPIN, 1);
cfg->intpin = REG(PCIR_INTPIN, 1);
value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);