MASKREG_M1        179 drivers/scsi/arm/acornscsi.h #define MASK_ON		(MASKREG_M3|MASKREG_M2|MASKREG_M1|MASKREG_M0)
MASKREG_M1        180 drivers/scsi/arm/acornscsi.h #define MASK_OFF	(MASKREG_M3|MASKREG_M2|MASKREG_M1)