pci_find_bar
pm = pci_find_bar(pdev->dev.bsddev, PCIR_BAR(bar));
pm = pci_find_bar(dev, PCIR_BAR(bar));
pm = pci_find_bar(dev, reg);
pm = pci_find_bar(child, rid);
pci_write_bar(child, pci_find_bar(child, rid),
pci_write_bar(child, pci_find_bar(child, rid),
map = pci_find_bar(child, rid);
pm = pci_find_bar(pcidev, bar);
pm = pci_find_bar(pcidev, bio->pbi_reg);
pm = pci_find_bar(pcidev, pbm->pbm_reg);
struct pci_map *pci_find_bar(device_t dev, int reg);