AHCI_P_CLB
AHCI_READ(sc, AHCI_P_CLB(chp->ch_channel)),
AHCI_READ(sc, AHCI_P_CLB(chp->ch_channel)),
AHCI_READ(sc, AHCI_P_CLB(chp->ch_channel)),
AHCI_WRITE(sc, AHCI_P_CLB(i), BUS_ADDR_LO32(achp->ahcic_bus_cmdh));