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Resource forks are included only for .rsrc files. These are DeRezzed into their data fork. 'ckid' resources, from the Projector VCS, are not included. The Tools directory, containing mostly junk, is also excluded.
158 lines
4.8 KiB
Plaintext
158 lines
4.8 KiB
Plaintext
;__________________________________________________________________________________________________
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;
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; File: BrightnessPatches.a
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;
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; Contains: This routine will patch the .Screen driver on the Classic to return an
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; error to the caller when a status "GetScreenState" call is made. These
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; codes were supposed to return the state of the video. See XOScreenDriver.a
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; ON or OFF. This hardware feature was never implemented on the Classic.
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; The Backlight driver issues this call and since the driver does not return
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; an error, the Backlit driver makes assumptions based on the call succeeding.
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;
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; Written by: Gus Andrade & Gayle Wiesner
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;
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; Copyright: © 1991 by Apple Computer, Inc., All rights reserved.
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;
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; Change History (most recent first):
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;
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; <1> 10/24/91 SAM Rolled in Regatta file.
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; <0> 7/17/91 SAM (GAA & GW) First checked in..
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; To Do:
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;__________________________________________________________________________________________________
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STRING PASCAL
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print OFF, NOGEN
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load 'StandardEqu.d'
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include 'LinkedPatchMacros.a'
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include 'HardwarePrivateEqu.a'
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include 'ATalkEqu.a'
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include 'Traps.a'
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print ON
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;----------------------------
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; Entry: None
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; Exit: Patches the Status calls to return an error on "GetScreenState" call.
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; Uses: A0-A2, D0-D1.
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;
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JMPInst equ $4ef9 ; jmp.abs.l instruction
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StatScrnOnOff equ $5302 ; Status code to return screen on/off state
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Regs reg A0-A2/D1
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ClassicBrightPatch InstallProc (SE)
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IMPORT csCodeCheck
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IMPORT OldStatusPatch
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;
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; The following record is taken from the ScreenDriverEqu.a file.
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; Any changes to the record need to be reflected in both locations.
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;
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ScreenDrvrGlobs RECORD 0,increment
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setValue ds.w 1 ; current brightness value
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StatusPatch ds.w 3 ; allow patching Status here
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ControlPatch ds.w 3 ; allow patching Control here
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ScreenGlobSize EQU *
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ENDR
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WITH ScreenDrvrGlobs
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;
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; Open the .Screen driver
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;
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@openDrvr
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movem.l Regs,-(SP) ; Save work registers
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sub.w #ioQElSize,SP ; Allocate IO stack frame
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lea #'.Screen',A1 ; load pointer to driver name
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move.l sp,a0 ; set a0 to point to the pb
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move.l a1,ioVNPtr(A0) ; load pointer to name
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move.b #fsCurPerm,ioPermssn(A0) ; set permission (not used)
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_Open
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tst.w ioResult(a0) ; check for Open Success
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bne.s @OpenFailed
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;
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; Point to device control entry for the .Screen driver
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;
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move.w ioRefNum(a0),d1 ; form the unit table entry number
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addq.w #1,d1
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neg.w d1
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lsl.w #2,d1 ; calculate index into unit table
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movea.l utablebase,a1 ; get unit table address
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move.l (a1,d1.w),a1 ; point to dce for screen driver
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movea.l (a1),a1 ; dereference handle
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;
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; Install the patch into the Screen driver's StatusPatch area
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; (save the old StatusPatch into our code)
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;
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movea.l dctlStorage(a1),a1 ; point to driver's private storage
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lea OldStatusPatch, a2 ; point to patch save area <7/17/91 GW>
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move.w StatusPatch(a1),(a2)+ ; save the first word <7/17/91 GW>
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move.l StatusPatch+2(a1),(a2) ; save the next longword <7/17/91 GW>
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move.w #JMPInst,StatusPatch(a1) ; put a jmp instruction in first wd of patch area
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leaResident csCodeCheck,a2 ; get the address of our patch routine
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move.l a2,StatusPatch+2(a1) ; put it into the patch area
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@OpenFailed
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add.w #ioQElSize,SP ; Release stack frame
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movem.l (SP)+,Regs
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rts ; Sucess returned in status
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ENDWITH
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ENDP
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;_______________________________________________________________________
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;
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; Routine: csCodeCheck
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; Inputs: a0 - pointer to I/O ParamBlock
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; a1 - pointer to Device Control Entry (DCE)
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;
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; Outputs: d0 - Result Code
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;
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; Destroys: none
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;
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; Called by: Screen Driver ScreenStatus routine
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;
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; Function: Checks for csCode of StatScrnOnOff.
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;
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; If equal, returns StatusErr and exits through jIODone.
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; This removes support for Brightness Driver
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; status call to get state (on/off) of the screen, which is not
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; supported in the Classic hardware platform.
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;
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; If not equal, executes whatever code was copied by our InstallProc
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; from the Screen Driver's StatusPatch area. This will either
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; link to the next patch, or rts (the default).
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;_______________________________________________________________________
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csCodeCheck PROC EXPORT
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EXPORT OldStatusPatch
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cmpi.w #StatScrnOnOff,csCode(a0) ; if StatScrnOnOff, return an error
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beq errReturn
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OldStatusPatch nop ; our installproc saved the old patch <7/17/91 GW>
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nop ; here; if everyone plays by the <7/17/91 GW>
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nop ; rules, this should be either rts or <7/17/91 GW>
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; a jmp to the next patch <7/17/91 GW>
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rts ; Just in case the previous patch JSRed instead of JMP
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errReturn
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move.w #StatusErr,d0
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move.l jIODone,(sp) ; replace jsr return with IODone routine address
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rts
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ENDP
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END. |