PCI_BRIDGE_IOHIGH_LIMIT
limith = __SHIFTOUT(iohigh, PCI_BRIDGE_IOHIGH_LIMIT);
ioend |= __SHIFTOUT(reshigh, PCI_BRIDGE_IOHIGH_LIMIT) << 16;
limit_h = PCIREG_SHIFTOUT(rval, PCI_BRIDGE_IOHIGH_LIMIT);
__SHIFTIN(io_limit >> 16, PCI_BRIDGE_IOHIGH_LIMIT);
limit |= __SHIFTOUT(reg, PCI_BRIDGE_IOHIGH_LIMIT) <<16;