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Copy pathMacros.asm
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Macros.asm
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; ===========================================================================
; Macros
; ===========================================================================
; ---------------------------------------------------------------------------
; simplifying macros and functions
; nameless temporary symbols should NOT be used inside macros because they can interfere with the surrounding code
; normal labels should be used instead (which automatically become local to the macro)
; ---------------------------------------------------------------------------
; makes a VDP address difference
vdpCommDelta function addr,((addr&$3FFF)<<16)|((addr&$C000)>>14)
; makes a VDP command
vdpComm function addr,type,rwd,(((type&rwd)&3)<<30)|((addr&$3FFF)<<16)|(((type&rwd)&$FC)<<2)|((addr&$C000)>>14)
; sign-extends a 32-bit integer to 64-bit
; all RAM addresses are run through this function to allow them to work in both 16-bit and 32-bit addressing modes
ramaddr function x,-(-x)&$FFFFFFFF
; function using these variables
id function ptr,((ptr-offset)/ptrsize+idstart)
; function to convert two separate nibble into a byte
nibbles_to_byte function nibble1,nibble2,(((nibble1)<<4)&$F0)|((nibble2)&$FF)
; function to convert two separate bytes into a word
bytes_to_word function byte1,byte2,(((byte1)<<8)&$FF00)|((byte2)&$FF)
; function to convert two separate word into a long
words_to_long function word1,word2,(((word1)<<16)&$FFFF0000)|((word2)&$FFFF)
; function to convert two separate bytes and word into a word
bytes_word_to_long function byte1,byte2,word,((((byte1)<<24)&$FF000000)|(((byte2)<<16)&$FF0000)|((word)&$FFFF))
; function to convert four separate bytes into a long
bytes_to_long function byte1,byte2,byte3,byte4,(((byte1)<<24)&$FF000000)|(((byte2)<<16)&$FF0000)|(((byte3)<<8)&$FF00)|((byte4)&$FF)
; ---------------------------------------------------------------------------
; values for the type argument
VRAM = %100001
CRAM = %101011
VSRAM = %100101
; values for the rwd argument
READ = %001100
WRITE = %000111
DMA = %100111
; ---------------------------------------------------------------------------
; tells the VDP to copy a region of 68k memory to VRAM or CRAM or VSRAM
dma68kToVDP macro source,dest,length,type
move.l #(($9400|((((length)>>1)&$FF00)>>8))<<16)|($9300|(((length)>>1)&$FF)),VDP_control_port-VDP_control_port(a5)
move.l #(($9600|((((source)>>1)&$FF00)>>8))<<16)|($9500|(((source)>>1)&$FF)),VDP_control_port-VDP_control_port(a5)
move.w #$9700|(((((source)>>1)&$FF0000)>>16)&$7F),VDP_control_port-VDP_control_port(a5)
move.w #(vdpComm(dest,type,DMA)>>16)&$FFFF,VDP_control_port-VDP_control_port(a5)
move.w #vdpComm(dest,type,DMA)&$FFFF,-(sp)
move.w (sp)+,VDP_control_port-VDP_control_port(a5)
; From ' § 7 DMA TRANSFER' of https://emu-docs.org/Genesis/sega2f.htm:
;
; "In the case of ROM to VRAM transfers,
; a hardware feature causes occasional failure of DMA unless the
; following two conditions are observed:
;
; --The destination address write (to address $C00004) must be a word
; write.
;
; --The final write must use the work RAM.
; There are two ways to accomplish this, by copying the DMA program
; into RAM or by doing a final "move.w ram address $C00004""
endm
; tells the VDP to fill a region of VRAM with a certain byte
dmaFillVRAM macro byte,addr,length
move.w #$8F01,VDP_control_port-VDP_control_port(a5) ; VRAM pointer increment: $0001
move.l #(($9400|((((length)-1)&$FF00)>>8))<<16)|($9300|(((length)-1)&$FF)),VDP_control_port-VDP_control_port(a5) ; DMA length ...
move.w #$9780,VDP_control_port-VDP_control_port(a5) ; VRAM fill
move.l #vdpComm(addr,VRAM,DMA),VDP_control_port-VDP_control_port(a5) ; start at ...
move.w #bytes_to_word(byte,byte),(VDP_data_port).l ; fill with byte
.loop:
moveq #2,d1
and.w VDP_control_port-VDP_control_port(a5),d1
bne.s .loop ; busy loop until the VDP is finished filling...
move.w #$8F02,VDP_control_port-VDP_control_port(a5) ; VRAM pointer increment: $0002
endm
; -------------------------------------------------------------
; Macro to check button presses
; Arguments:
; 1 - buttons to check
; -------------------------------------------------------------
tpress macro press,player
if player=2
move.b (Ctrl_2_pressed).w,d0
else
move.b (Ctrl_1_pressed).w,d0
endif
andi.b #(press),d0
endm
; -------------------------------------------------------------
; Macro to check if buttons are held
; Arguments:
; 1 - buttons to check
; -------------------------------------------------------------
theld macro press,player
if player=2
move.b (Ctrl_2_held).w,d0
else
move.b (Ctrl_1_held).w,d0
endif
andi.b #(press),d0
endm
; ---------------------------------------------------------------------------
; set a VRAM address via the VDP control port.
; input: 16-bit VRAM address, control port (default is (VDP_control_port).l)
; ---------------------------------------------------------------------------
locVRAM macro loc, controlport
if ("controlport"=="")
move.l #$40000000|vdpCommDelta(loc),(VDP_control_port).l
else
move.l #$40000000|vdpCommDelta(loc),controlport
endif
endm
; ---------------------------------------------------------------------------
; macro for a debug object list header
; must be on the same line as a label that has a corresponding _end label later
; ---------------------------------------------------------------------------
dbglistheader macro {INTLABEL}
__LABEL__ label *
dc.w ((__LABEL___end - __LABEL__ - 2) / $A)
endm
; macro to define debug list object data
dbglistobj macro obj, mapaddr, subtype, frame, vram, pal, pri
dc.l frame<<24|((obj)&$FFFFFF)
dc.l subtype<<24|((mapaddr)&$FFFFFF)
dc.w make_art_tile(vram,pal,pri)
endm
; ---------------------------------------------------------------------------
; macro for declaring a "main level load block" (MLLB)
; ---------------------------------------------------------------------------
levartptrs macro art1,art2,map16x16r,map16x161,map16x162,map128x128r,map128x1281,map128x1282,palette,wpalette,music
dc.l (palette)<<24|((art1)&$FFFFFF),art2
dc.l (wpalette)<<24|((map16x16r)&$FFFFFF),map16x161,map16x162
dc.l (music)<<24|((map128x128r)&$FFFFFF),map128x1281,map128x1282
endm
; ---------------------------------------------------------------------------
palptr macro ptr,lineno
dc.l ptr
dc.w (Normal_palette+lineno*palette_line_size)&$FFFF
dc.w bytesToLcnt(ptr_end-ptr)
endm
watpalptrs macro height,spal,kpal
dc.w height
dc.b spal, kpal
endm
; ---------------------------------------------------------------------------
; macro to declare sub-object data
subObjData macro mappings,vram,pal,pri,height,width,prio,frame,collision
dc.l mappings
dc.w make_art_tile(vram,pal,pri)
dc.b (height/2),(width/2)
dc.w sprite_priority(prio)
dc.b frame,collision
endm
; macro to declare sub-object data
subObjData2 macro vram,pal,pri,height,width,prio,frame,collision
dc.w make_art_tile(vram,pal,pri)
dc.b (height/2),(width/2)
dc.w sprite_priority(prio)
dc.b frame,collision
endm
; macro to declare sub-object data
subObjData3 macro height,width,prio,frame,collision
dc.b (height/2),(width/2)
dc.w sprite_priority(prio)
dc.b frame,collision
endm
; macro to declare sub-object slotted data
subObjSlotData macro slots,vram,pal,pri,offset,index,mappings,height,width,prio,frame,collision
dc.w slots,make_art_tile(vram,pal,pri),offset,index
dc.l mappings
dc.b (height/2),(width/2)
dc.w sprite_priority(prio)
dc.b frame,collision
endm
; macro to declare sub-object data
subObjMainData macro address,render,routine,height,width,prio,vram,pal,pri,mappings,frame,collision
dc.l address
dc.b render,routine,(height/2),(width/2)
dc.w sprite_priority(prio),make_art_tile(vram,pal,pri)
dc.l mappings
dc.b frame, collision
endm
; macro to declare sub-object data
subObjMainData2 macro address,render,routine,height,width,prio,vram,pal,pri,mappings
dc.l address
dc.b render,routine,(height/2),(width/2)
dc.w sprite_priority(prio),make_art_tile(vram,pal,pri)
dc.l mappings
endm
; macro to declare sub-object data
subObjMainData3 macro render,routine,height,width,prio,vram,pal,pri,mappings
dc.b render,routine,(height/2),(width/2)
dc.w sprite_priority(prio),make_art_tile(vram,pal,pri)
dc.l mappings
endm
; ---------------------------------------------------------------------------
zoneAnimals macro first,second
dc.ATTRIBUTE (Obj_Animal_Properties_first - Obj_Animal_Properties), (Obj_Animal_Properties_second - Obj_Animal_Properties)
endm
objanimaldecl macro mappings, address, xvel, yvel, {INTLABEL}
Obj_Animal_Properties___LABEL__: label *
dc.l mappings, address
dc.w xvel, yvel
endm
objanimalending macro address, mappings, vram, xvel, yvel
dc.l address, mappings
dc.w vram, xvel, yvel
dc.w 0 ; even
endm
; ---------------------------------------------------------------------------
titlecardresultsheader macro {INTLABEL}
__LABEL__ label *
dc.w ((__LABEL___end - __LABEL__) / $E)-1
endm
titlecardresultsobjdata macro address,xdest,xpos,ypos,frame,width,exit
dc.l address ; object address
dc.w 128+xdest,128+xpos,128+ypos ; x destination, xpos, ypos
dc.b frame,(width/2) ; mapping frame, width
dc.w exit ; place in exit queue
endm
; ---------------------------------------------------------------------------
; calculates initial loop counter value for a dbf loop
; that writes n bytes total at 4 bytes per iteration
bytesTo4Lcnt function n,n>>4
; calculates initial loop counter value for a dbf loop
; that writes n bytes total at 4 bytes per iteration
bytesTo2Lcnt function n,n>>2
; calculates initial loop counter value for a dbf loop
; that writes n bytes total at 4 bytes per iteration
bytesToLcnt function n,n>>2-1
; calculates initial loop counter value for a dbf loop
; that writes n bytes total at 2 bytes per iteration
bytesToWcnt function n,n>>1-1
; calculates initial loop counter value for a dbf loop
; that writes n bytes total at x bytes per iteration
bytesToXcnt function n,x,n/x-1
; ---------------------------------------------------------------------------
; fills a region of 68k RAM with 0
clearRAM macro startaddr,endaddr
if startaddr>endaddr
fatal "Starting address of clearRAM \{startaddr} is after ending address \{endaddr}."
elseif startaddr==endaddr
warning "clearRAM is clearing zero bytes. Turning this into a nop instead."
exitm
endif
if ((startaddr)&$8000)==0
lea (startaddr).l,a1
else
lea (startaddr).w,a1
endif
moveq #0,d0
if ((startaddr)&1)
move.b d0,(a1)+
endif
if ((bytesToLcnt((endaddr-startaddr) - ((startaddr)&1)))<=$7F)
moveq #bytesToLcnt((endaddr-startaddr) - ((startaddr)&1)),d1
else
move.w #bytesToLcnt((endaddr-startaddr) - ((startaddr)&1)),d1
endif
.clear:
move.l d0,(a1)+
dbf d1,.clear
if (((endaddr-startaddr) - ((startaddr)&1))&2)
move.w d0,(a1)+
endif
if (((endaddr-startaddr) - ((startaddr)&1))&1)
move.b d0,(a1)+
endif
endm
; fills a region of 68k RAM with 0
clearRAM2 macro startaddr,endaddr
if startaddr>endaddr
fatal "Starting address of clearRAM2 \{startaddr} is after ending address \{endaddr}."
elseif startaddr==endaddr
warning "clearRAM2 is clearing zero bytes. Turning this into a nop instead."
exitm
endif
if ((startaddr)&$8000)==0
lea (startaddr).l,a1
else
lea (startaddr).w,a1
endif
moveq #0,d0
if ((startaddr)&1)
move.b d0,(a1)+
endif
rept bytesTo2Lcnt((endaddr-startaddr) - ((startaddr)&1))
move.l d0,(a1)+
endr
if (((endaddr-startaddr) - ((startaddr)&1))&2)
move.w d0,(a1)+
endif
if (((endaddr-startaddr) - ((startaddr)&1))&1)
move.b d0,(a1)+
endif
endm
; fills a region of 68k RAM with 0
clearRAM3 macro startaddr,endaddr
if startaddr>endaddr
fatal "Starting address of clearRAM \{startaddr} is after ending address \{endaddr}."
elseif startaddr==endaddr
warning "clearRAM is clearing zero bytes. Turning this into a nop instead."
exitm
endif
if ((startaddr)&$8000)==0
lea (startaddr).l,a1
else
lea (startaddr).w,a1
endif
moveq #0,d0
if ((startaddr)&1)
move.b d0,(a1)+
endif
if ((bytesToXcnt(((endaddr-startaddr) - ((startaddr)&1)),(16*4)))<=$7F)
moveq #bytesToXcnt(((endaddr-startaddr) - ((startaddr)&1)),(16*4)),d1
else
move.w #bytesToXcnt(((endaddr-startaddr) - ((startaddr)&1)),(16*4)),d1
endif
.clear:
rept 16
move.l d0,(a1)+
endr
dbf d1,.clear
if (((endaddr-startaddr) - ((startaddr)&1))&2)
move.w d0,(a1)+
endif
if (((endaddr-startaddr) - ((startaddr)&1))&1)
move.b d0,(a1)+
endif
endm
; copy 68k RAM
copyRAM macro startaddr,endaddr,startaddr2
if startaddr>endaddr
fatal "Starting address of copyRAM \{startaddr} is after ending address \{endaddr}."
elseif startaddr==endaddr
warning "copyRAM is copy zero bytes. Turning this into a nop instead."
exitm
endif
if ((startaddr)&$8000)==0
lea (startaddr).l,a1
else
lea (startaddr).w,a1
endif
if ((startaddr2)&$8000)==0
lea (startaddr2).l,a2
else
lea (startaddr2).w,a2
endif
moveq #0,d0
if ((startaddr)&1)
move.b (a1)+,(a2)+
endif
if ((bytesToLcnt((endaddr-startaddr) - ((startaddr)&1)))<=$7F)
moveq #bytesToLcnt((endaddr-startaddr) - ((startaddr)&1)),d1
else
move.w #bytesToLcnt((endaddr-startaddr) - ((startaddr)&1)),d1
endif
.clear:
move.l (a1)+,(a2)+
dbf d1,.clear
if (((endaddr-startaddr) - ((startaddr)&1))&2)
move.w (a1)+,(a2)+
endif
if (((endaddr-startaddr) - ((startaddr)&1))&1)
move.b (a1)+,(a2)+
endif
endm
; copy 68k RAM
copyRAM2 macro startaddr,endaddr,startaddr2
if startaddr>endaddr
fatal "Starting address of copyRAM2 \{startaddr} is after ending address \{endaddr}."
elseif startaddr==endaddr
warning "copyRAM2 is copy zero bytes. Turning this into a nop instead."
exitm
endif
if ((startaddr)&$8000)==0
lea (startaddr).l,a1
else
lea (startaddr).w,a1
endif
if ((startaddr2)&$8000)==0
lea (startaddr2).l,a2
else
lea (startaddr2).w,a2
endif
moveq #0,d0
if ((startaddr)&1)
move.b (a1)+,(a2)+
endif
rept bytesTo2Lcnt((endaddr-startaddr) - ((startaddr)&1))
move.l (a1)+,(a2)+
endr
if (((endaddr-startaddr) - ((startaddr)&1))&2)
move.w (a1)+,(a2)+
endif
if (((endaddr-startaddr) - ((startaddr)&1))&1)
move.b (a1)+,(a2)+
endif
endm
; ---------------------------------------------------------------------------
; load Kosinski Plus and Kosinski Plus Moduled
; ---------------------------------------------------------------------------
; load Kosinski Plus data to RAM
QueueKosPlus macro data,ram,terminate
lea (data).l,a1
if ((ram)&$8000)==0
lea (ram).l,a2
else
lea (ram).w,a2
endif
if ("terminate"="0") || ("terminate"="")
jsr (Queue_KosPlus).w
else
jmp (Queue_KosPlus).w
endif
endm
; load Kosinski Plus Moduled art to VRAM
QueueKosPlusModule macro art,vram,terminate
lea (art).l,a1
if ((vram)<=3)
moveq #tiles_to_bytes(vram),d2
else
move.w #tiles_to_bytes(vram),d2
endif
if ("terminate"="0") || ("terminate"="")
jsr (Queue_KosPlus_Module).w
else
jmp (Queue_KosPlus_Module).w
endif
endm
; ---------------------------------------------------------------------------
; load Enigma
; ---------------------------------------------------------------------------
; load Enigma data to RAM
EniDecomp macro data,ram,vram,palette,pri,terminate
lea (data).l,a0
if ((ram)&$8000)==0
lea (ram).l,a1
else
lea (ram).w,a1
endif
move.w #make_art_tile(vram,palette,pri),d0
if ("terminate"="0") || ("terminate"="")
jsr (Eni_Decomp).w
else
jmp (Eni_Decomp).w
endif
endm
; ---------------------------------------------------------------------------
; load DMA
; ---------------------------------------------------------------------------
; load DMA
AddToDMAQueue macro art,vram,size,terminate
move.l #dmaSource(art),d1
move.w #tiles_to_bytes(vram),d2
if ((size/2)<=$7F)
moveq #(size/2),d3
else
move.w #(size/2),d3
endif
if ("terminate"="0") || ("terminate"="")
jsr (Add_To_DMA_Queue).w
else
jmp (Add_To_DMA_Queue).w
endif
endm
; ---------------------------------------------------------------------------
; check if object moves out of range
; input: location to jump to if out of range, x-axis pos (x_pos(a0) by default)
; ---------------------------------------------------------------------------
out_of_xrange macro exit, xpos
moveq #-$80,d0 ; round down to nearest $80
if ("xpos"<>"")
and.w xpos,d0 ; get object position (if specified as not x_pos)
else
and.w x_pos(a0),d0 ; get object position
endif
out_of_xrange2.ATTRIBUTE exit
endm
out_of_xrange2 macro exit
sub.w (Camera_X_pos_coarse_back).w,d0 ; get screen position
cmpi.w #$80+320+$40+$80,d0 ; this gives an object $80 pixels of room offscreen before being unloaded (the $40 is there to round up 320 to a multiple of $80)
bhi.ATTRIBUTE exit
endm
; ---------------------------------------------------------------------------
; check if object moves out of range
; input: location to jump to if out of range, x-axis pos (y_pos(a0) by default)
; ---------------------------------------------------------------------------
out_of_yrange macro exit, ypos
moveq #-$80,d0 ; round down to nearest $80
if ("ypos"<>"")
and.w ypos,d0 ; get object position (if specified as not y_pos)
else
and.w y_pos(a0),d0 ; get object position
endif
out_of_yrange2.ATTRIBUTE exit
endm
out_of_yrange2 macro exit
sub.w (Camera_Y_pos_coarse_back).w,d0
cmpi.w #$80+256+$80,d0
bhi.ATTRIBUTE exit
endm
; ---------------------------------------------------------------------------
; object respawn delete
; ---------------------------------------------------------------------------
respawn_delete macro terminate
move.w respawn_addr(a0),d0 ; get address in respawn table
beq.s .delete ; if it's zero, it isn't remembered
movea.w d0,a2 ; load address into a2
bclr #7,(a2)
.delete
if ("terminate"="0") <> ("terminate"="")
jmp (Delete_Current_Sprite).w
endif
endm
; ---------------------------------------------------------------------------
; macros for frequently used subroutines
; ---------------------------------------------------------------------------
getobjectRAMslot macro address
if ("address"=="")
fatal "Error! Empty value!"
endif
move.w #Dynamic_object_RAM_end,d0
sub.w a0,d0
lsr.w #6,d0 ; divide by $40... even though SSTs are $4A bytes long in this game
lea (Create_New_Sprite3.find_first_sprite_table).w,address
move.b (address,d0.w),d0 ; use a look-up table to get the right loop counter
endm
MoveSprite macro address, gravity, terminate
if ("address"=="")
fatal "Error! Empty value!"
endif
movem.w x_vel(address),d0/d2 ; load xy speed
asl.l #8,d0 ; shift velocity to line up with the middle 16 bits of the 32-bit position
asl.l #8,d2 ; shift velocity to line up with the middle 16 bits of the 32-bit position
add.l d0,x_pos(address) ; add to x-axis position ; note this affects the subpixel position x_sub(address) = 2+x_pos(address)
add.l d2,y_pos(address) ; add to y-axis position ; note this affects the subpixel position y_sub(address) = 2+y_pos(address)
if ("gravity"<>"")
addi.w #gravity,y_vel(address) ; increase vertical speed (apply gravity)
else
addi.w #$38,y_vel(address) ; increase vertical speed (apply gravity)
endif
if ("terminate"<>"")
rts
endif
endm
MoveSprite2 macro address, terminate
if ("address"=="")
fatal "Error! Empty value!"
endif
movem.w x_vel(address),d0/d2 ; load xy speed
asl.l #8,d0 ; shift velocity to line up with the middle 16 bits of the 32-bit position
asl.l #8,d2 ; shift velocity to line up with the middle 16 bits of the 32-bit position
add.l d0,x_pos(address) ; add to x-axis position ; note this affects the subpixel position x_sub(address) = 2+x_pos(address)
add.l d2,y_pos(address) ; add to y-axis position ; note this affects the subpixel position y_sub(address) = 2+y_pos(address)
if ("terminate"<>"")
rts
endif
endm
MoveSpriteXOnly macro address, terminate
if ("address"=="")
fatal "Error! Empty value!"
endif
move.w x_vel(address),d0 ; load x speed
ext.l d0
asl.l #8,d0 ; shift velocity to line up with the middle 16 bits of the 32-bit position
add.l d0,x_pos(address) ; add to x-axis position ; note this affects the subpixel position x_sub(address) = 2+x_pos(address)
if ("terminate"<>"")
rts
endif
endm
MoveSpriteYOnly macro address, gravity, terminate
if ("address"=="")
fatal "Error! Empty value!"
endif
move.w y_vel(address),d0 ; load y speed
ext.l d0
asl.l #8,d0 ; shift velocity to line up with the middle 16 bits of the 32-bit position
add.l d0,y_pos(address) ; add to y-axis position ; note this affects the subpixel position y_sub(a0) = 2+y_pos(a0)
if ("gravity"<>"")
addi.w #gravity,y_vel(address) ; increase vertical speed (apply gravity)
else
addi.w #$38,y_vel(address) ; increase vertical speed (apply gravity)
endif
if ("terminate"<>"")
rts
endif
endm
MoveSprite2YOnly macro address, terminate
if ("address"=="")
fatal "Error! Empty value!"
endif
move.w y_vel(address),d0 ; load y speed
ext.l d0
asl.l #8,d0 ; shift velocity to line up with the middle 16 bits of the 32-bit position
add.l d0,y_pos(address) ; add to y-axis position ; note this affects the subpixel position y_sub(a0) = 2+y_pos(a0)
if ("terminate"<>"")
rts
endif
endm
Add_SpriteToCollisionResponseList macro address, terminate
if ("address"=="")
fatal "Error! Empty value!"
endif
lea (Collision_response_list).w,address
move.w (address),d0 ; get list to d0
addq.b #2,d0 ; is list full? ($80)
bmi.s .full ; if so, return
move.w d0,(address) ; save list ($7E)
move.w a0,(address,d0.w) ; store RAM address in list
.full
if ("terminate"<>"")
rts
endif
endm
CreateNewSprite macro obj, terminate
jsr (Create_New_Sprite).w
bne.s .skip
move.l #obj,address(a1)
.skip
if ("terminate"<>"")
rts
endif
endm
CreateNewSprite3 macro obj, terminate
jsr (Create_New_Sprite3).w
bne.s .skip
move.l #obj,address(a1)
.skip
if ("terminate"<>"")
rts
endif
endm
; ---------------------------------------------------------------------------
; macro for marking the boundaries of an object layout file
; ---------------------------------------------------------------------------
ObjectLayoutBoundary macro
dc.w -1, 0, 0
endm
; ---------------------------------------------------------------------------
; macro for marking the boundaries of an ring layout file
; ---------------------------------------------------------------------------
RingLayoutBoundary macro
dc.w 0, 0, -1, -1
endm
; ---------------------------------------------------------------------------
; function to make a little-endian 16-bit pointer for the Z80 sound driver
; ---------------------------------------------------------------------------
z80_ptr function x,(x)<<8&$FF00|(x)>>8&$7F|$80
; ---------------------------------------------------------------------------
; macro to declare a little-endian 16-bit pointer for the Z80 sound driver
; ---------------------------------------------------------------------------
rom_ptr_z80 macro addr
dc.w z80_ptr(addr)
endm
; ---------------------------------------------------------------------------
; clear the Z80 RAM
; ---------------------------------------------------------------------------
clearZ80RAM macro
lea (Z80_RAM).l,a0
move.w #$1FFF,d0
.clear:
clr.b (a0)+
dbf d0,.clear
endm
paddingZ80RAM macro
moveq #0,d0
.clear:
move.b d0,(a1)+
cmpa.l #(Z80_RAM_end),a1
bne.s .clear
endm
; ---------------------------------------------------------------------------
; stop the Z80
; ---------------------------------------------------------------------------
; tells the Z80 to stop, and waits for it to finish stopping (acquire bus)
stopZ80 macro
if OptimiseStopZ80=0
move.w #$100,(Z80_bus_request).l ; stop the Z80
nop
nop
nop
.wait:
btst #0,(Z80_bus_request).l
bne.s .wait ; loop until it says it's stopped
endif
endm
; tells the Z80 to stop, and waits for it to finish stopping (acquire bus)
stopZ80a macro
if OptimiseStopZ80=0
move.w #$100,(Z80_bus_request).l ; stop the Z80
nop
nop
nop
endif
endm
; ---------------------------------------------------------------------------
; wait for Z80 to stop
; ---------------------------------------------------------------------------
; tells the Z80 to wait for it to finish stopping (acquire bus)
waitZ80 macro
if OptimiseStopZ80=0
.wait:
btst #0,(Z80_bus_request).l
bne.s .wait ; loop until
endif
endm
; ---------------------------------------------------------------------------
; reset the Z80
; ---------------------------------------------------------------------------
; tells the Z80 to reset
resetZ80 macro
if OptimiseStopZ80=0
move.w #$100,(Z80_reset).l
endif
endm
; tells the Z80 to reset
resetZ80a macro
if OptimiseStopZ80=0
move.w #0,(Z80_reset).l
endif
endm
; ---------------------------------------------------------------------------
; start the Z80
; ---------------------------------------------------------------------------
; tells the Z80 to start again
startZ80 macro
if OptimiseStopZ80=0
move.w #0,(Z80_bus_request).l ; start the Z80
endif
endm
; ---------------------------------------------------------------------------
; stop the Z80 (2)
; ---------------------------------------------------------------------------
; tells the Z80 to stop, and waits for it to finish stopping (acquire bus)
stopZ802 macro
if OptimiseStopZ80=2
move.w #$100,(Z80_bus_request).l ; stop the Z80
nop
nop
nop
.wait:
btst #0,(Z80_bus_request).l
bne.s .wait ; loop until it says it's stopped
endif
endm
; ---------------------------------------------------------------------------
; start the Z80 (2)
; ---------------------------------------------------------------------------
; tells the Z80 to start again
startZ802 macro
if OptimiseStopZ80=2
move.w #0,(Z80_bus_request).l ; start the Z80
endif
endm
; ---------------------------------------------------------------------------
; wait for the Z80
; ---------------------------------------------------------------------------
waitZ80time macro time
move.w #(time),d0
.wait:
nop
nop
nop
nop
dbf d0,.wait
endm
; ---------------------------------------------------------------------------
; disable interrupts
; ---------------------------------------------------------------------------
disableInts macro
move #$2700,sr
endm
; ---------------------------------------------------------------------------
; enable interrupts
; ---------------------------------------------------------------------------
enableInts macro
move #$2300,sr
endm
; ---------------------------------------------------------------------------
; disable interrupts
; ---------------------------------------------------------------------------
disableIntsSave macro
move.w sr,-(sp) ; save current interrupt mask
disableInts ; mask off interrupts
endm
; ---------------------------------------------------------------------------
; enable interrupts
; ---------------------------------------------------------------------------
enableIntsSave macro
move.w (sp)+,sr ; restore interrupts to previous state
endm
; ---------------------------------------------------------------------------
; disable screen
; ---------------------------------------------------------------------------
disableScreen macro
moveq #signextendB(%10111111),d0
and.w (VDP_reg_1_command).w,d0
move.w d0,(VDP_control_port).l
endm
; ---------------------------------------------------------------------------
; enable screen
; ---------------------------------------------------------------------------
enableScreen macro
moveq #%1000000,d0
or.w (VDP_reg_1_command).w,d0
move.w d0,(VDP_control_port).l
endm
; ---------------------------------------------------------------------------
; long conditional jumps
; ---------------------------------------------------------------------------
jhi macro loc
bls.s .nojump
jmp loc
.nojump:
endm
jcc macro loc
bcs.s .nojump
jmp loc
.nojump:
endm
jhs macro loc
jcc loc
endm
jls macro loc
bhi.s .nojump
jmp loc
.nojump:
endm
jcs macro loc
bcc.s .nojump
jmp loc
.nojump:
endm
jlo macro loc
jcs loc
endm
jeq macro loc
bne.s .nojump
jmp loc
.nojump:
endm
jne macro loc
beq.s .nojump
jmp loc
.nojump:
endm
jgt macro loc
ble.s .nojump
jmp loc
.nojump:
endm