pci_mech1_putw
pci_putw_func = pci_mech1_putw;
pci_putw_func = pci_mech1_putw;
pci_mech1_putw(bus, device, function, reg, val);
pci_mech1_putw(bus, device, function, reg, val);
extern void pci_mech1_putw(int bus, int dev, int func, int reg, uint16_t val);