AHCI_P_CI
AHCI_READ(AHCI_CH2SC(chp), AHCI_P_CI(chp->ch_channel))),
AHCI_READ(sc, AHCI_P_CI(chp->ch_channel)),
AHCI_WRITE(sc, AHCI_P_CI(chp->ch_channel), 1U << slot);
AHCI_READ(sc, AHCI_P_CI(chp->ch_channel))),
AHCI_READ(AHCI_CH2SC(chp), AHCI_P_CI(chp->ch_channel))),
AHCI_READ(AHCI_CH2SC(chp), AHCI_P_CI(chp->ch_channel))),
AHCI_READ(sc, AHCI_P_CI(chp->ch_channel))), DEBUG_XFERS);
AHCI_WRITE(sc, AHCI_P_CI(chp->ch_channel), 1U << xfer->c_slot);
AHCI_READ(sc, AHCI_P_CI(chp->ch_channel))),
AHCI_READ(sc, AHCI_P_CI(chp->ch_channel))), DEBUG_XFERS);
AHCI_WRITE(sc, AHCI_P_CI(chp->ch_channel), 1U << xfer->c_slot);
AHCI_READ(sc, AHCI_P_CI(chp->ch_channel))),
AHCI_READ(sc, AHCI_P_CI(chp->ch_channel)),
sact = AHCI_READ(sc, AHCI_P_CI(chp->ch_channel));
AHCI_WRITE(sc, AHCI_P_CI(chp->ch_channel), 1U << slot);
if ((AHCI_READ(sc, AHCI_P_CI(chp->ch_channel)) & (1U << slot)) ==