pci_bar_start
mmio_start = pci_bar_start(p, PCI_BASE_ADDRESS_0);
hw.io_base = pci_bar_start(p, i);
addr = pci_bar_start(pci, PCI_BASE_ADDRESS_0);
addr = pci_bar_start(pci, PCI_BASE_ADDRESS_1);
extern unsigned long pci_bar_start(struct pci_device *dev, unsigned int bar);
rtreg_base = pci_bar_start(pdev, PCI_BASE_ADDRESS_1);
tg3reg_base = pci_bar_start(pdev, PCI_BASE_ADDRESS_0);