SCB_GET_TARGET_OFFSET
(0x01 << (SCB_GET_TARGET_OFFSET(ahd, scb)))
target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
(0x01 << (SCB_GET_TARGET_OFFSET(ahc, scb)))