1 line
9.5 KiB
Plaintext
1 line
9.5 KiB
Plaintext
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;*******************************************************
;
; SCSI Driver 'Shutdown' filter.
;
; Written by Matt Gulick. Started August 9,1988
;
; Copyright Apple Computer, Inc. 1988,89
;
;*******************************************************
;*******************************************************
;
; This file contains the 'Shutdown' filter as defined
; in the ERS.
;
;*******************************************************
;*******************************************************
;
; Revision History:
;
;*******************************************************
;
; Aug 9, 1988 File started.
; Mar 8, 1989 Modified to support Warm/Cold
; Shutdown.
STRING PASCAL
BLANKS OFF
PAGESIZE 70
PRINT NOGEN
PRINT NOMDIR
MACHINE M65816
IMPORT direct_page
IMPORT default_dib
IMPORT tot_dib_cnt
IMPORT active_starts
IMPORT stop_unit
PRINT OFF
INCLUDE 'scsihd.equates'
INCLUDE 'M16.MEMORY'
INCLUDE 'M16.UTIL'
PRINT ON
EJECT
;*******************************************************
;
; Main Entry point to the 'Shutdown' filter. This
; "Filter" is called when a Device is no longer
; desired in the tables. The following code segment
; first checks to see if the DIB being shut down is
; the default dib (it will only be shutdown durring
; startup). If it is the default dib we will do
; nothing and exit with no error. If on the other
; hand it is a valid DIB, we will clear some key
; fields within the dib and then we will alter the
; links to skip this DIB, then we update a field in the
; first DIB of this memory segment. This count tells
; how many active dibs there are in that segment. If
; this reaches zero we will then dispose this handle
; because it is unused. If we later need space to
; bring new devices online and we don't have the space,
; we'll get it at that time. If on exit there are
; still any active dibs that use this code segment then
; a DRVR_BUSY error will be returned. If no DIBs are
; active then no error will be returned.
;
; Inputs: [dib_ptr] = Last DIB built (LONG)
; Acc = Unspecified
; Carry = Unspecified
; Y register = Unspecified
; X register = Unspecified
; P register = 0=M=X=e
; Direct Page = Ours
; Data Bank = Ours
;
; Outputs: Acc = DRVR_BUSY
; Carry = 1
; unless we have no more dibs then
; 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: See Spec.
;
;*******************************************************
EXPORT shutdown
shutdown PROC
;
; Check to see if this is for the
; 'default_dib'. If it is, then we
; need to exit with a DRVR_BUSY Error.
;
lda <dib_ptr
cmp #default_dib
bne @real_dib
lda <dib_ptr+2
cmp #^default_dib
bne @real_dib
;
; Return a DRVR BUSY error and take
; no action.
;
lda #drvr_busy
sec
rts
@real_dib
;-------------------------------------------------------------------------------
IF warm_ss_suprt = true THEN
;
; It's a real DIB. Is it a COLD
; SHUTDOWN?
;
lda >warm_cold_flag
and #$0001
beq @do_cold ;It's Cold
;
; Yeah, so it's a warm shutdown. But
; does this device know what that
; means? We'll see!
;
ldy #dib.dvcchar
lda [dib_ptr],y
and #restartable
beq @do_cold ;Not restartable.
;
; Mark as OFFLINE and Relaxing
;
ldy #dib.dvcflag
lda [dib_ptr],y
and #dvc_online--\
$ffff
ora #relaxing
sta [dib_ptr],y
;
; Is the device removable?
;
; ldy #dib.dvcchar
; lda [dib_ptr],y
; and #removable
; beq @continue ;Not removable.
;
; Reinitialise DIB Device Number to
; zero.
;
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