PCI_BRIDGE_BUS_SUBORDINATE
v &= ~(PCI_BRIDGE_BUS_SUBORDINATE | PCI_BRIDGE_BUS_SECONDARY |
__SHIFTIN(1, PCI_BRIDGE_BUS_SUBORDINATE));
__SHIFTIN(0xff, PCI_BRIDGE_BUS_SUBORDINATE));
__SHIFTIN(*maxbus & 0xff, PCI_BRIDGE_BUS_SUBORDINATE));
busreg |= __SHIFTIN(sub, PCI_BRIDGE_BUS_SUBORDINATE);
__SHIFTIN(pb->next_busno, PCI_BRIDGE_BUS_SUBORDINATE);
((uint32_t)__SHIFTOUT((reg), PCI_BRIDGE_BUS_SUBORDINATE))