mac-rom/QuickDraw/JacksonPollock/32ATInit.a

;
;	File:		32ATInit.a
;
;	Contains:	ArrowInit.a
;
;	Written by:	Jim Straus
;
;	Copyright:	<09> 1990 by Apple Computer, Inc., all rights reserved.
;
;	Change History (most recent first):
;
;		 <2>	 4/16/90	KON		Remove Duplicate definitions from HardwarePrivateEqu.a
;
;	To Do:
;

;	======================================================================
;	ArrowInit.a			<09> 1988-1990 by Apple Computer Inc
;						by Jim Straus					12/8/88
;	======================================================================

	BLANKS      ON
	PRINT		OFF
	
	INCLUDE		'Traps.a'
	INCLUDE		'SysEqu.a'
	INCLUDE		'QuickEqu.a'
	INCLUDE		'HardwarePrivateEqu.a'
	INCLUDE		'ToolEqu.a'
	INCLUDE		'SlotEqu.a'
	INCLUDE 	'VideoEqu.a'
	INCLUDE 	'ROMEqu.a'
	PRINT		ON
	BRANCH		SHORT
	STRING      ASIS
	
;	======================================================================
;	Header to main init code.
;	======================================================================

			MACHINE MC68020

Init		MAIN	EXPORT

;----------
; Hardware configuration bits.
;----------

HWCfgFlags	EQU 		$B22	  				; (word) HW Configuration flags

			MOVE.W		HwCfgFlags,D0			; check <20>em the compulsive way
			BTST		#hwCbAUX,D0				; is it A/UX time?			
			BEQ.S		PatchInit				; if not, go install patch
			RTS									; else do nothing


AppleShare	EQU		$FFD6				; one's complement of hard coded 41
KillArrows	EQU		$F9					; control code to kill the arrows



; This patch turns off the arrows in the corner when AppleShare is running.
			
OurOpen		CMP.L	#$0e2e4146,([18,A0])	; does name start with $#e'.AF'?
			BNE.S	NotOurs					; if not, just pass it on
MayBeOurs	CMP.L	#'PTra',([18,A0],4)		; compare the last character 'PTra'
			BNE.S	NotOurs

			; the driver is Appleshare, so make the call and return to us.
			
			PEA		MakeCtrl				; where we want to return to
NotOurs		JMP		([RealOpen])			; call RealOpen without disturbing registers
			
MakeCtrl	BNE.S	OutOfHere				; if error on open then return it
											; make the control call turning off the arrows
											; [reuse parameter block, ioRefNum is valid]
			MOVE.L	#0,csParam(A0)
			MOVE.W	#KillArrows,csCode(A0)
			MOVE.L	#0,ioCompletion(A0)
			MOVE.W	#0,ioVRefNum(A0)
			_Control						; turn off arrows
			
OutOfHere	RTS								; and we're done
			
RealOpen	DC.L	0						; a place for pointer to real Open

RealEnd		EQU		*


; This init installs the patch code into the system heap and patches
; the trap to point to the new code.  It also stores the old address
; of the trap into the patch so the patch may pass the call along.
; If the mouse button is down when the INIT happens, the code is not
; installed and the icon not shown.


f32BitMod 		EQU			2							; you probably don't have this equate

PatchInit
			WITH spBlock,vpBlock		; only do the test at init time.  If capable, make the patch
				
;
; allocate a spBlock (slot parameter block) on the stack
;
	
				SUB.w		#spBlockSize,SP				;
				MOVE.L		SP,A0						; save pointer to block
		
;
; initialize the fields for a sNextTypesRsrc call (see IM5, Ch24, p9 for more info)
;
	
				CLR.B		spID(A0)					; start at spID 0
				CLR.B		spExtDev(A0)				; set ext dev ID to 0 also
				MOVE.W		#CatDisplay, spCategory(A0)	; look for a Mac-style video card
				MOVE.W		#TypVideo, spCType(A0)		; 
				MOVE.W		#DrSwApple,spDrvrSw(A0)		; 
				MOVE.B		#1,spTBMask(A0)				; set sType masking field

				MOVE.B		#-1,spSlot(A0)				; put in first slot number
		
;
; now, call the slot manager to find the sRsrc list for this card
;
											
@NxtSlot		add.b		#1,spSlot(a0)
				_sNextTypesRsrc						
				BNE.S		Dead						; oh oh, something's seriously wrong
		
;
; now that you have the right sRsrcList in spsPointer, get the sRsrcFlags word
;	from the video sRsrc
;

				MOVE.B		#sRsrcFlags,spID(A0)		; look for sRsrcFlags
				_sReadWord								; spsPointer is still set up from before
				BNE.S		@NxtSlot					; ***can there be more than one?
				MOVE.l		spResult(A0),D0				; get the result in a reg
;
; test the flag word for 32-bit devices
;
				BTST		#f32BitMod,D0				; test it
				BEQ.S		@NxtSlot					; if not a 32-bit device, don't do init
							
   
				MOVE.L	#(RealEnd - OurOpen),D1	; get size of our code
				MOVE.L	D1,D0
				_NewPtr	,SYS				; get a pointer of the appropriate size
				TST.L	D0					; see if an error
				BNE		Dead				; if so, quit out
				MOVE.L	A0,A3				; save pointer to new block
				LEA		OurOpen,A0			; get address of code to install
				MOVE.L	A3,A1				; destination of the code
				MOVE.L	D1,D0				; and length of the code
				_BlockMove					; put the code into the system heap
				MOVE.L	#$A000,D0			; Open
				_GetTrapAddress				; get the real address
				MOVE.L	A0,RealOpen-OurOpen(A3)	; and save in special location
				MOVE.L	#$A000,D0			; Open
				MOVE.L	A3,A0				; this is the new code
				_SetTrapAddress				; and it is installed
	
;
; release the slot manager block
;
Dead			ADD.L	#spBlockSize,SP		; clean up the stack
				RTS

			END