mac-rom/Internal/Asm/VectorTableInit.a

;
;	File:		VectorTableInit.a
;
;	Contains:	This contains macros used to create the code that initilizes
;				the ROM vectors. The user needs to assemble this file directly,
;				and pass in the name of the of the vector table source file
;				( VectorTable.a ) and the value of ROMBASE on the command
;				line with:
;
;				Asm VectorTableInit.a -d ROMBASE=$40800000 -d "&VectorTable='filename'"
;
;	Written by:	Kurt Clark
;
;	Copyright:	© 1992-1993 by Apple Computer, Inc., all rights reserved.
;
;	Change History (most recent first):
;
;	   <SM3>	 2/25/93	kc		Added a table listing all of the low memory vectors, and rewrote
;									the macros to simplify things a little.
;	   <SM2>	 2/21/93	kc		Change to case on and add nonVectorizedRom conditional.
;		 <1>	 12/2/92	kc		first checked in
;	To Do:
;

		Machine mc68020

		Case On
		

kInfoTableFormat	Equ		1			; info table format version
kDescTableFormat	Equ		1			; descriptor table format version
kDirectVector		Equ		1			; direct vector type
kIndirectVector		Equ		2			; indirect vector type

DescriptorVect		Equ		$2000		; address of table descriptor vector


		macro							; Nothing to do here.
&Name	vDataTable						
		endmacro						


		macro
&Name	vNoVector						; ibid.
		endmacro


		macro							; ibid.
&Name	vATrap		&TNum				; ( At some point we may decide to administer atraps
		endmacro						;   with the same technique we use for ROM vectors. )


		macro							; ibid.
&Name	vDirect		&TVec, &CVec, &AReg	; ( At some point we may decide to direct vectors
		endmacro						;   with the same technique we use for ROM vectors. )


		macro
&Name	vIndirect	&TVec, &CVec, &AReg, &Cond

		If &Name = '' Then					; check name
		
		  AError 'Name missing from vIndirect Macro'
		  
		  Exitm
		  
		Endif
		
		If &Cond ­ '' Then					; check conditional
		
		  If &Type(&Cond) = 'UNDEFINED' Or Not &Eval(&Cond) Then
		  
			Exitm
			
		  Endif
		  
		Endif

		gblc	&tables[$1000]				; list of tables
		gbla	&tableCnt					; number of tables
		gbla	&sizes[$1000]				; number of entries in each table
		gbla	&lastTVect					; last table vector
		gbla	&thisTVect					; this table vector
		gbla	&lastCVect					; last code vector
		gbla	&thisCVect					; this code vector
		
		&thisTVect: seta &eval(&TVec)		; convert from string to int
		&thisCVect: seta &eval(&CVec)		; convert from string to int
	
		If &lastTVect ­ &thisTVect Then		; check for new vector table

InitVec&TVec	proc	export					; initialize the vector table vector
				import	BASEOFROM				; import rom base
				import	VecInfo&TVec			; import vector table info
				lea		@VecTable(pc),a0		; load address the vector table
				move.l	a0,&TVec				; stuff address of vector table into table vector
				rts								; and return to sender
				align	16						
@VecTable		dc.l	VecInfo&TVec-BASEOFROM+ROMBASE; this will point to the table info rec				

		  &lastTVect: seta &thisTVect
		
		  &lastCVect: seta 0
		
		  &tables[&tableCnt + 1]: setc &TVec
		  
		  &tableCnt: seta &tableCnt + 1
		
	 	Endif ; new vector table

		; verify that the vector table offsets are sorted
	
		If &thisCVect < &lastCVect Then
	  
		  AError 'Code vectors are not sorted by offset'
		
		  ExitM
		
		Endif

		; fill in the unused "holes" with the address of BADTRAP
	
		If (&thisCVect - &lastCVect) > 4 Then
	  
				import	BADTRAP
		
				dcb.l	(&thisCVect - &lastCVect - 4)/4 ,BADTRAP-BASEOFROM+ROMBASE
		
		Endif
		
		; Create the vector table
		
				import	__v__&Name				; import mangled name
		
				dc.l	__v__&Name-BASEOFROM+ROMBASE
  
		&sizes[&thisTVect - $2000]: seta &thisCVect / 4 ; keep track of the table size

		&lastCVect: seta &thisCVect

		endmacro


		macro
		InitDescriptors
		gbla	&sizes[$1000]				; number of entries in each table
		gblc	&tables[$1000]				; list of tables
		gbla	&tableCnt					; number of tables
		lcla	&index						; loop index
		lcla	&vnum						; vector table number
		lclc	&vname						; vector table name
		
&index	seta	1
		while	&index <= &tableCnt Do			; for each table

&vnum	seta	&eval ( &tables[&index] )
&vname	setc	&tables[&index]
		 
VecInfo&vname	Proc	Export
				dc.l	kInfoTableFormat		; info table format version
				dc.l	kDirectVector			; vector type
				dc.l	&sizes[&vnum - $2000]	; number of entries in vector table
				
&index	seta	&index + 1
		endw


InitDescriptors	Proc	Export
				lea		@descriptor(pc),a0		; load address the table descriptor
				move.l	a0,DescriptorVect		; stuff address of table descriptor into vector
				rts								; and return to sender
@descriptor		dc.l	kDescTableFormat		; descriptor table format version
				dc.l	&tableCnt				; number of entries in vector table

&index	seta	1
		while	&index <= &tableCnt Do			; for each table	
		 
				dc.l	&tables[&index]			; stuff the address
				
&index	seta	&index + 1
		endw
		endmacro


		macro
		InitRomVectors
		gblc	&tables[$1000]				; list of tables
		gbla	&tableCnt					; number of tables
		lcla	&index						; loop index
		
INITROMVECTORS	Proc	Export
				bsr.l	InitDescriptors			; call routine to init descriptor

&index	seta	1

		while	&index <= &tableCnt Do		; for each table	

				bsr.l	InitVec&tables[&index]	; call the table's init routines
				
&index	seta	&index + 1

		endw

			 	rts								; return to startinit

		endmacro


	IF	NOT nonVectorizedRom Then

			Include &VectorTable		; create the vector tables			
		
	ENDIF
			InitDescriptors				; create the vector table descriptors
			
			InitRomVectors				; create code to init the vectors
			
			End