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WRITING A DRIVER
5-12
5
******************************************************************
************
**
* THE CODE BELOW HANDLES FINAL RETURN CODES.
FINALSTAT:
BSR POSTSTAT POSTSTAT IS A SUBROUTINE THAT POSTS FINAL
STATUS
* POSTSTAT RETURNS THE Z BIT=1 IF STATUS IS O.K.
******************************************************************
************
**
* THE CODE BELOW IS A COMMON EXIT CODE FOR THIS DRIVER.
RET_OUT
BTST #13,D0 RTE REQUIRED?
IF <EQ> THEN
BSR RESTORE_REG A3 IS THE INPUT TO THIS REGISTER RESTORE
ROUTINE
RTE EXECUTE THE RTE FOR THE SCSI FIRMWARE
ENDI
* THERE ARE ONLY TWO WAYS TO ACTUALLY ’EXIT’ THIS CALLER ROUTINE.
* 1. IS TO EXIT VIA THE EXECUTION OF AN RTE. (A TASK WAS INTERRUPTED
BY THE
* SCSI BUS AND THE EXECUTION OF THE RTE WILL RESUME THAT TASK.)
*
* 2. A ROUTINE CALLED THIS DRIVER BY A SUBROUTINE CALL. IT IS RETURNED
TO WITH
* THE EXECUTION OF AN RTS.
*
* ALL OTHER ’EXITS’ GO BACK TO THE SCSI FIRMWARE (FOR THIS
EXAMPLE).
RTS