/
startup.i
192 lines (154 loc) · 4.07 KB
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startup.i
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INTENASET = %1100000000100000
; ab-------cdefg--
; a: SET/CLR Bit
; b: Master Bit
; c: Blitter Int
; d: Vert Blank Int
; e: Copper Int
; f: IO Ports/Timers
; g: Software Int
DMASET = %1000001111000000
; a----bcdefghi--j
; a: SET/CLR Bit
; b: Blitter Priority
; c: Enable DMA
; d: Bit Plane DMA
; e: Copper DMA
; f: Blitter DMA
; g: Sprite DMA
; h: Disk DMA
; i..j: Audio Channel 0-3
; PRINTT
; PRINTT "MINI STARTUP BY STINGRAY/[S]CARAB^SCOOPEX"
; PRINTT " .oO LAST CHANGE: THU, 02-JAN-2020 Oo."
; PRINTT
***************************************************
*** MACRO DEFINITION ***
***************************************************
WAITBLIT MACRO
tst.b $02(a6)
.\@ btst #6,$02(a6)
bne.b .\@
ENDM
***************************************************
*** CLOSE DOWN SYSTEM - INIT PROGRAM ***
***************************************************
START movem.l d0-a6,-(a7)
move.l $4.w,a6
lea .VARS_HW(pc),a5
move.l a5,a1
moveq #0,d0
jsr -552(a6) ; OpenLibrary()
move.l d0,.GFXbase-.VARS_HW(a5)
beq.b .END
move.l d0,a6
move.l 34(a6),.OldView-.VARS_HW(a5)
sub.l a1,a1
bsr.w .DoView
move.l $26(a6),.OldCop1-.VARS_HW(a5) ; Store old CL 1
move.l $32(a6),.OldCop2-.VARS_HW(a5) ; Store old CL 2
bsr .GetVBR
move.l d0,.VBRptr-.VARS_HW(a5)
move.l d0,a0
*** Store Custom Regs ***
lea $dff000,a6 ; base address
move.w $10(a6),.ADK-.VARS_HW(a5) ; Store old ADKCON
move.w $1C(a6),.INTENA-.VARS_HW(a5) ; Store old INTENA
move.w $02(a6),.DMA-.VARS_HW(a5) ; Store old DMA
move.w #$7FFF,d0
bsr WaitRaster
move.w d0,$9A(a6) ; Disable Interrupts
move.w d0,$96(a6) ; Clear all DMA channels
move.w d0,$9C(a6) ; Clear all INT requests
move.l $6c(a0),.OldVBI-.VARS_HW(a5)
lea .NewVBI(pc),a1
move.l a1,$6c(a0)
; move.w #INTENASET!$C000,$9A(a6) ; set Interrupts+ BIT 14/15
; move.w #DMASET!$8200,$96(a6) ; set DMA + BIT 09/15
bsr MAIN
***************************************************
*** Restore Sytem Parameter etc. ***
***************************************************
.END lea .VARS_HW(pc),a5
lea $dff000,a6
clr.l VBIptr-.VARS_HW(a5)
move.w #$8000,d0
or.w d0,.INTENA-.VARS_HW(a5) ; SET/CLR-Bit to 1
or.w d0,.DMA-.VARS_HW(a5) ; SET/CLR-Bit to 1
or.w d0,.ADK-.VARS_HW(a5) ; SET/CLR-Bit to 1
subq.w #1,d0
bsr WaitRaster
move.w d0,$9A(a6) ; Clear all INT bits
move.w d0,$96(a6) ; Clear all DMA channels
move.w d0,$9C(a6) ; Clear all INT requests
move.l .VBRptr(pc),a0
move.l .OldVBI(pc),$6c(a0)
move.l .OldCop1(pc),$80(a6) ; Restore old CL 1
move.l .OldCop2(pc),$84(a6) ; Restore old CL 2
move.w d0,$88(a6) ; start copper1
move.w .INTENA(pc),$9A(a6) ; Restore INTENA
move.w .DMA(pc),$96(a6) ; Restore DMAcon
move.w .ADK(pc),$9E(a6) ; Restore ADKcon
move.l .GFXbase(pc),a6
move.l .OldView(pc),a1 ; restore old viewport
bsr.b .DoView
move.l a6,a1
move.l $4.w,a6
jsr -414(a6) ; Closelibrary()
movem.l (a7)+,d0-a6
moveq #0,d0
rts
.DoView jsr -222(a6) ; LoadView()
jsr -270(a6) ; WaitTOF()
jmp -270(a6)
*******************************************
*** Get Address of the VBR ***
*******************************************
.GetVBR move.l a5,-(a7)
moveq #0,d0 ; default at $0
move.l $4.w,a6
btst #0,296+1(a6) ; 68010+?
beq.b .is68k ; nope.
lea .getit(pc),a5
jsr -30(a6) ; SuperVisor()
.is68k move.l (a7)+,a5
rts
.getit movec vbr,d0
rte ; back to user state code
*******************************************
*** VERTICAL BLANK (VBI) ***
*******************************************
.NewVBI movem.l d0-a6,-(a7)
move.l VBIptr(pc),d0
beq.b .noVBI
move.l d0,a0
jsr (a0)
.noVBI lea $dff09c,a6
moveq #$20,d0
move.w d0,(a6)
move.w d0,(a6) ; twice to avoid a4k hw bug
movem.l (a7)+,d0-a6
rte
*******************************************
*** DATA AREA FAST ***
*******************************************
.VARS_HW
.GFXname dc.b 'graphics.library',0,0
.GFXbase dc.l 0
.OldView dc.l 0
.OldCop1 dc.l 0
.OldCop2 dc.l 0
.VBRptr dc.l 0
.OldVBI dc.l 0
.ADK dc.w 0
.INTENA dc.w 0
.DMA dc.w 0
VBIptr dc.l 0
WaitRaster
.wait btst #0,$dff004+1
bne.b .wait
rts
WaitRasterEnd
.wait btst #0,$dff004+1
beq.b .wait
rts