AHCI_CMDH_F_WR
((ata_c->flags & AT_WRITE) ? AHCI_CMDH_F_WR : 0) |
((ata_bio->flags & ATA_READ) ? 0 : AHCI_CMDH_F_WR) |
((sc_xfer->xs_control & XS_CTL_DATA_OUT) ? AHCI_CMDH_F_WR : 0) |