1 line
5.9 KiB
Plaintext
1 line
5.9 KiB
Plaintext
|
;*******************************************************
;
; SCSI Driver 'Close' Filter
;
; Written by Matt Gulick. Started June 8,1988
;
; Copyright Apple Computer, Inc. 1988,89
;
;*******************************************************
;*******************************************************
;
; This file contains the subroutines needed by the
; SCSI Driver to respond to the Close call number
; $0004. In a Block Device Driver this will return no
; error and perform no function. In the case of a
; Character device however, this will need to reset
; the state of the target device to what it was prior
; to the Open Call..
;
;*******************************************************
;*******************************************************
;
; Revision History:
;
;*******************************************************
; June 8, 1988 File started.
; June 20 1988 Registers in and out are
; described and changes from Code
; review inserted.
; April 11, 1989 Added Code for Scanner.
STRING PASCAL
BLANKS OFF
PAGESIZE 70
PRINT NOGEN
PRINT NOMDIR
MACHINE M65816
IMPORT test_unit_rdy
IMPORT auto_sense_data
IMPORT release_unit
IMPORT open_flag
PRINT OFF
INCLUDE 'scsihd.equates'
INCLUDE 'M16.MEMORY'
INCLUDE 'M16.UTIL'
PRINT ON
EJECT
IF block_dvc = true\
AND character_dvc = false THEN
;*******************************************************
;
; This routine is used as the Close code for a Block
; Device Driver.
;
; Inputs: None.
;
; Outputs: Acc = 0
; Carry = 0
; Y register = Unspecified
; X register = Unspecified
; P register = 0=M=X=e
; Direct Page = GS/OS Direct Page
; Data Bank = Ours
;
; Errors: None
;
;*******************************************************
ENDIF
;-------------------------------------------------------------------------------
IF character_dvc = true\
AND block_dvc = false THEN
;*******************************************************
;
; This routine is used as the Close code for a
; Character Device Driver. This code is commented out
; so that is available to any one who uses this SCSI
; Driver Skeleton.
;
; Inputs: None.
;
; Outputs: Acc = Error
; Carry = Set or Clear
; Y register = Unspecified
; X register = Unspecified
; P register = 0=M=X=e
; Direct Page = GS/OS Direct Page
; Data Bank = Ours
;
; Errors: Device not open Error $0023
; For other errors see Spec.
;
;*******************************************************
ENDIF
;-------------------------------------------------------------------------------
EXPORT close
close PROC
;-------------------------------------------------------------------------------
IF block_dvc = true\
AND character_dvc = false THEN
;
; Is the device online?
;
ldy #dib.dvcflag
lda [dib_ptr],y
and #dvc_online
bne @close ;Yes.
;
; Device is currently offline.
;
lda #drvr_off_line
sec
rts
;
; Return to caller
;
@close lda #$0000
clc
rts
ENDIF
;-------------------------------------------------------------------------------
IF character_dvc = true\
AND block_dvc = false THEN
;
; Is the device online?
;
ldy #dib.dvcflag
lda [dib_ptr],y
and #dvc_online
bne @close ;Yes.
;
; Device is currently offline.
;
lda #drvr_off_line
sec
rts
;
; Check if Open.
;
@close lda |open_flag
beq @dvc_closed
;
; Clear Open Flag Now incase we
; terminate from an I/O Problem.
;
lda #$0000
sta |open_flag
;-------------------------------------------------------------------------------
IF scsi_dtype = scanner\
OR scsi_dtype = appl_laser THEN
;
; It's a character device.
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