PCI_BRIDGE_BUS_PRIMARY
PCI_BRIDGE_BUS_PRIMARY);
__SHIFTIN(0, PCI_BRIDGE_BUS_PRIMARY) |
busreg = __SHIFTIN(prim, PCI_BRIDGE_BUS_PRIMARY);
__SHIFTIN(pb->busno, PCI_BRIDGE_BUS_PRIMARY) |
((uint32_t)__SHIFTOUT((reg), PCI_BRIDGE_BUS_PRIMARY))