173 lines
3.0 KiB
ArmAsm
173 lines
3.0 KiB
ArmAsm
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XREF _custom
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; write this from scratch and get it working
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; then plug it into C
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FUNC_CNT SET -30
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FUNCDEF MACRO
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_LVO\1 EQU FUNC_CNT
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FUNC_CNT SET FUNC_CNT-6
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ENDM
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INCDIR "include_i_39:"
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INCDIR "extra_lvos_39:"
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INCLUDE "exec/exec_lib.i"
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INCLUDE "exec/types.i"
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INCLUDE "exec/execbase.i"
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INCLUDE "exec/libraries.i" # get the CALLLIB macro
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INCLUDE "graphics/gfxbase.i"
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INCLUDE "graphics_lvo.i"
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INCLUDE "hardware/custom.i"
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INCLUDE "hardware/dmabits.i"
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START:
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BSR _takeOverSystem
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BSR _giveBackSystem
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MOVE.L #0,D0
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RTS
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OpenGraphicsLibrary MACRO
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LEA GraphicsLibrary,A1
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MOVEQ #0,D0
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CALLLIB _LVOOpenLibrary
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MOVE.L D0,GraphicsBase
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ENDM
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TakeOverView MACRO
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MOVE.L GraphicsBase,A6
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MOVE.L gb_ActiView(A6),OldView
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MOVEQ #0,D0
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CALLLIB _LVOLoadView
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CALLLIB _LVOWaitTOF
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CALLLIB _LVOWaitTOF
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ENDM
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PreserveOldCopper MACRO
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MOVE.L $26(A6),OldCopper1
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MOVE.L $32(A6),OldCopper2
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ENDM
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GetVBRPointer MACRO
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BSR getVBR
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MOVE.L D0,VBRPtr
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ENDM
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PreserveOldRegisters MACRO
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LEA _custom,A6
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MOVE.W adkconr(A6),Oldadkcon
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MOVE.W intenar(A6),Oldintena
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MOVE.W dmaconr(A6),Olddmacon
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ENDM
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ClearRegisters MACRO
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MOVE.W #$7FFF,D0
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BSR waitRaster
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MOVE.W D0,intena(A6)
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MOVE.W D0,dmacon(A6)
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MOVE.W D0,intreq(A6)
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ENDM
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SetRegisters MACRO
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MOVE.W #$C000,intena(A6) ; enable master interrupt
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MOVE.W #$3FFF,intena(A6) ; disable every other interrupt
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MOVE.W #DMAF_SETCLR|DMAF_COPPER|DMAF_RASTER|DMAF_BLITTER,dmacon(A6)
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MOVE.W #DMAF_AUDIO|DMAF_DISK|DMAF_SPRITE,dmacon(A6)
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ENDM
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_takeOverSystem:
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MOVEM.L A6,-(SP)
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CLR.W $100
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MOVE.L $4,A6
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CALLLIB _LVOForbid
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OpenGraphicsLibrary
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PreserveOldCopper
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CALLLIB _LVOOwnBlitter
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CALLLIB _LVOWaitBlit
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PreserveOldRegisters
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SetRegisters
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TakeOverView
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MOVEM.L (SP)+,A6
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RTS
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waitRaster:
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MOVE.L D0,-(SP)
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.loop:
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MOVE.L $DFF004,D0
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AND.L #$1FF00,D0
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CMP.L #303<<8,D0
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BNE .loop
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MOVE.L (SP)+,D0
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RTS
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_giveBackSystem:
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CLR.W $100
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MOVEM.L A6,-(SP)
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LEA _custom,A6
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MOVE.W #$8000,d0
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OR.W D0,Olddmacon
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OR.W D0,Oldintena
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OR.W D0,Oldadkcon
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SUBQ #1,D0
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;ClearRegisters
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MOVE.L OldCopper1,cop1lc(A6)
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MOVE.L OldCopper2,cop2lc(A6)
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MOVE.W #1,copjmp1(A6)
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MOVE.W Olddmacon,intena(A6)
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MOVE.W Olddmacon,dmacon(A6)
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MOVE.W Oldadkcon,adkcon(A6)
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MOVE.L OldView,A1
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MOVE.L GraphicsBase,A6
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CALLLIB _LVOLoadView
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CALLLIB _LVOWaitTOF
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CALLLIB _LVOWaitTOF
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MOVE.L $4,A6
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MOVE.L GraphicsBase,D0
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MOVE.L D0,A1
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CALLLIB _LVOCloseLibrary
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CALLLIB _LVOPermit
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MOVEM.L (SP)+,A6
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RTS
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getVBR:
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MOVE.L A5,-(SP)
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MOVEQ #0,D0
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MOVE.L $4,A6
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BTST #0,AttnFlags+1(A6)
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BEQ .is68K
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LEA .get010VBR(pc),A5
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CALLLIB _LVOSupervisor
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.is68K:
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MOVE.L (SP)+,A5
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RTS
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.get010VBR:
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dc.l $4E7A0801 ; movec vcr,d0
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RTE
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CNOP 0,4
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GraphicsLibrary dc.b 'graphics.library',0
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CNOP 0,4
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GraphicsBase dc.l 1
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OldView dc.l 1
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OldCopper1 dc.l 1
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OldCopper2 dc.l 1
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VBRPtr dc.l 1
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Oldadkcon dc.w 0
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Oldintena dc.w 0
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Olddmacon dc.w 0
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