RREAD4
RWRITE4((sc), (reg), RREAD4((sc), (reg)) | (bits))
RWRITE4((sc), (reg), RREAD4((sc), (reg)) & ~(bits))
stat = RREAD4(sc, PCIE_CORE_LANE_CONF(portno));
stat = RREAD4(sc, PCIE_CORE_LANE_CONF(portno));