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Partial hack for earthworm jim 2 spc transfers

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z_demo_z
2002-06-02 01:44:39 +00:00
parent 695a0e6aa2
commit 9672fc4074
2 changed files with 64 additions and 130 deletions
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185
zsnes/src/cpu/dma.asm
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@@ -1137,7 +1137,62 @@ NEWSYM indirectaddr
.tempdecr db 0
.fname2 db 9,'vram2.dat',0
EXTSYM spcRam
NEWSYM ewj2hack, dd 0
NEWSYM hdmatype2indirect
cmp dword [ewj2hack],1
jne near .notend
cmp byte [esi+1],40h ; Writing to spc
jne near .notend
cmp byte [esi+10],0DAh ; first transfer
jne near .notend
; EWJ2 HACK
; int 3h
push eax
push ebx
push ecx
push edx
xor eax,eax
xor ebx,ebx
xor ecx,ecx
xor edx,edx
mov ax,word[spcRam+021h] ; load dest offset
mov dword [.dest],spcRam
add [.dest],eax
mov dl,byte[esi+10] ; number of bytes to transfer
sub dl,80h
.inloop
xor ebx,ebx
xor ecx,ecx
mov bl,[esi+7]
mov cx,[esi+5]
inc word[esi+5]
call dword near [memtabler8+ebx*4]
mov ebx,[.dest]
mov byte [ebx],al
inc ebx
mov [.dest],ebx
xor ebx,ebx
xor ecx,ecx
mov bl,[esi+7]
mov cx,[esi+5]
inc word[esi+5]
call dword near [memtabler8+ebx*4]
mov ebx,[.dest]
mov byte [ebx],al
inc ebx
mov [.dest],ebx
dec edx
jnz .inloop
sub word[esi+5],5Ah
sub word[esi+5],5Ah
pop edx
pop ecx
pop ebx
pop eax
.notend
mov al,[edx+16]
mov [.tempdecr],al
xor ebx,ebx
@@ -1176,135 +1231,7 @@ NEWSYM hdmatype2indirect
dec byte[esi+10]
ret
.tempdecr db 0
NEWSYM dohdma2
; new hdma routines
xor ebx,ebx
push eax
test [hdmatype],ah
jz .nostart
xor ah,0FFh
xor ecx,ecx
and [hdmatype],ah
test byte[esi],40h
jnz near .indir
mov bl,[esi+4]
mov cx,[esi+8]
call dword near [memtabler8+ebx*4]
inc word[esi+8]
xor ebx,ebx
mov [esi+10],al
jmp .nostart
.indir
mov bl,[esi+4]
mov [esi+7],bl
mov cx,[esi+2]
mov [esi+5],cx
call dword near [memtabler8+ebx*4]
xor ebx,ebx
inc word[esi+5]
mov bl,[esi+7]
mov [esi+10],al
mov cx,[esi+5]
call dword near [memtabler8+ebx*4]
xor ebx,ebx
inc word[esi+5]
mov bl,[esi+7]
mov [esi+8],al
mov cx,[esi+5]
call dword near [memtabler8+ebx*4]
inc word[esi+5]
mov [esi+9],al
xor ebx,ebx
.nostart
cmp byte[esi+10],0
je near .endhdma
mov bl,[esi+4]
mov al,[edx+16]
mov [.tempdecr],al
xor ecx,ecx
mov bl,[esi+4]
mov cx,[esi+8] ; increment/decrement/keep pointer location
call dword near [memtabler8+ebx*4]
call dword near [edx]
dec byte[.tempdecr]
jz .nomorehdma
xor ebx,ebx
mov cx,[esi+8] ; increment/decrement/keep pointer location
mov bl,[esi+4]
inc cx
call dword near [memtabler8+ebx*4]
call dword near [edx+4]
dec byte[.tempdecr]
jz .nomorehdma
xor ebx,ebx
mov cx,[esi+8] ; increment/decrement/keep pointer location
mov bl,[esi+4]
add cx,2
call dword near [memtabler8+ebx*4]
call dword near [edx+8]
dec byte[.tempdecr]
jz .nomorehdma
xor ebx,ebx
mov cx,[esi+8] ; increment/decrement/keep pointer location
mov bl,[esi+4]
add cx,3
call dword near [memtabler8+ebx*4]
call dword near [edx+12]
.nomorehdma
dec byte[esi+10]
test byte[esi+10],7Fh
jz .zeroed
test byte[esi+10],80h
jz .noadd
xor ebx,ebx
mov bl,[edx+16]
add [esi+8],bx
.noadd
pop eax
ret
.zeroed
test byte[esi],40h
jnz near .indirzero
xor ebx,ebx
mov bl,[edx+16]
add [esi+8],bx
mov bl,[esi+4]
mov cx,[esi+8]
call dword near [memtabler8+ebx*4]
inc word[esi+8]
mov [esi+10],al
pop eax
ret
.indirzero
xor ebx,ebx
mov bl,[esi+7]
mov cx,[esi+5]
call dword near [memtabler8+ebx*4]
xor ebx,ebx
inc word[esi+5]
mov bl,[esi+7]
mov [esi+10],al
mov cx,[esi+5]
call dword near [memtabler8+ebx*4]
xor ebx,ebx
inc word[esi+5]
mov bl,[esi+7]
mov [esi+8],al
mov cx,[esi+5]
call dword near [memtabler8+ebx*4]
inc word[esi+5]
mov [esi+9],al
pop eax
ret
.endhdma
pop eax
xor [nexthdma],ah
ret
.dest dd 0
.tempdecr db 0
NEWSYM exechdma