sa1regs.asm

linux下的任天堂模拟器代码。供大家参考。

    popad
    ret
.cumulativesum
    popad
    ret

sa12300r:
    mov al,[SA1Message+1]
    test byte[SA1IRQExec],1
    jz .notexecuted
    or al,80h
.notexecuted
    test byte[SA1IRQExec],2
    jz .notexecutedi
    or al,20h
.notexecutedi
    mov bl,[SA1IRQData+1]
    and bl,50h
    or al,bl
    ret
sa12301r:
    mov al,[SA1Message]
    test byte[SA1IRQExec+1],1
    jz .notexecuted
    or al,80h
.notexecuted
    ret
sa12306r:
;    call UpdateArithStuff
    mov al,[SA1ARR1]
    ret
sa12307r:
;    call UpdateArithStuff
    mov al,[SA1ARR1+1]
    ret
sa12308r:
;    call UpdateArithStuff
    mov al,[SA1ARR1+2]
    ret
sa12309r:
;    call UpdateArithStuff
    mov al,[SA1ARR1+3]
    ret
sa1230Ar:
;    call UpdateArithStuff
    mov al,[SA1ARR2]
    ret
sa1230Br:
    mov al,[SA1Overflow]
    ret

NEWSYM IRamRead
    mov al,[IRAM+ecx-3000h]
    ret

NEWSYM IRamWrite
    mov [IRAM+ecx-3000h],al
    ret
NEWSYM IRamWrite2
    mov [IRAM+ecx-3000h],al
    xor dh,dh
    ret

NEWSYM sa1223Fw
    mov [SA1Overflow+1],al
    ret

; Variable Length Data
NEWSYM sa12258w
    mov [VarLenBarrel+2],al
    mov bl,al
    and bl,0Fh
    cmp bl,0
    jne .not0
    mov bl,16
.not0
    mov [VarLenBarrel+3],bl
    test al,80h
    jz .notchange
    mov [VarLenBarrel],bl
    mov [VarLenBarrel+1],bl
.notchange
    ret
NEWSYM sa12259w
    mov [VarLenAddr],al
    mov [VarLenAddrB],al
    mov byte[VarLenBarrel],0
    mov byte[VarLenBarrel+1],0
    ret
NEWSYM sa1225Aw
    mov [VarLenAddr+1],al
    mov [VarLenAddrB+1],al
    mov byte[VarLenBarrel],0
    mov byte[VarLenBarrel+1],0
    ret
NEWSYM sa1225Bw
    mov [VarLenAddr+2],al
    mov [VarLenAddrB+2],al
    mov byte[VarLenBarrel],0
    mov byte[VarLenBarrel+1],0
    ret

; Variable Length Read
NEWSYM sa1230Cr
    push ecx
    xor ebx,ebx
    xor ecx,ecx
    mov bl,[VarLenAddr+2]
    mov cx,[VarLenAddr]
    test ecx,8000h
    jz .loweraddr
    add ecx,[snesmmap+ebx*4]
    jmp .upperaddr
.loweraddr
    add ecx,[snesmap2+ebx*4]
.upperaddr
    mov ebx,[ecx]
    mov cl,[VarLenBarrel+1]
    shr ebx,cl
    mov al,bl
    pop ecx
    test byte[VarLenBarrel+2],80h
    jnz .autoinc
    ret
.autoinc
    mov bl,[VarLenBarrel+3]
    add [VarLenBarrel],bl
    mov bl,[VarLenBarrel]
    cmp bl,16
    jbe .notover
    sub byte[VarLenBarrel],16
    add dword[VarLenAddr],2
    mov byte[VarLenAddr+3],0
.notover
    ret

NEWSYM sa1230Dr
    push ecx
    xor ebx,ebx
    xor ecx,ecx
    mov bl,[VarLenAddrB+2]
    mov cx,[VarLenAddrB]
    test ecx,8000h
    jz .loweraddr
    add ecx,[snesmmap+ebx*4]
    jmp .upperaddr
.loweraddr
    add ecx,[snesmap2+ebx*4]
.upperaddr
    mov ebx,[ecx]
    mov cl,[VarLenBarrel+1]
    shr ebx,cl
    mov al,bh
    pop ecx
    test byte[VarLenBarrel+2],80h
    jnz .autoinc
    ret
.autoinc
    mov bl,[VarLenBarrel+3]
    add [VarLenBarrel+1],bl
    mov bl,[VarLenBarrel+1]
    cmp bl,16
    jbe .notover
    sub byte[VarLenBarrel+1],16
    add dword[VarLenAddrB],2
    mov byte[VarLenAddrB+3],0
.notover
    ret

NEWSYM sa1230Er
    mov al,10h
    ret

; Approximate H loc
NEWSYM sa12302r
    test byte[SA1TimerSet],80h
    jnz .timeron
    mov al,[CurrentExecSA1]
    shl al,2
    add al,dh
    ret
.timeron
    mov al,[SA1TimerCount]
    ret
NEWSYM sa12303r
    test byte[SA1TimerSet],80h
    jnz .timeron
    mov al,[CurrentExecSA1]
    shr al,3
    ret
.timeron
    mov al,[SA1TimerCount+1]
    and al,1
    ret
NEWSYM sa12304r
    test byte[SA1TimerSet],80h
    jnz .timeron
    mov al,[curypos]
    ret
.timeron
    mov bx,[SA1TimerCount+1]
    shr bx,1
    mov al,bl
    ret
NEWSYM sa12305r
    test byte[SA1TimerSet],80h
    jnz .timeron
    mov al,[curypos+1]
    ret
.timeron
    mov bx,[SA1TimerCount+2]
    shr bx,1
    mov al,bl
    and al,1
    ret

NEWSYM sa12210w ; Timer Settings
   mov [SA1TimerSet],al
   ret
NEWSYM sa12211w ; Timer Clear
   mov dword[SA1TimerVal],0
   ret
NEWSYM sa12212w
   mov [SA1TimerCount],al
   ret
NEWSYM sa12213w
   mov [SA1TimerCount+1],al
   ret
NEWSYM sa12214w
   mov [SA1TimerCount+2],al
   ret
NEWSYM sa12215w
   mov [SA1TimerCount+3],al
   ret

NEWSYM sa12230w
    mov [SA1DMAInfo],al
    ret
NEWSYM sa12231w
    mov [SA1DMAChar],al
    ; if b7=1, then end of chdma process
    ret
SA1QuickF sa12232w, SA1DMASource
SA1QuickF sa12233w, SA1DMASource+1
SA1QuickF sa12234w, SA1DMASource+2
SA1QuickF sa12235w, SA1DMADest
NEWSYM sa12236w
    mov [SA1DMADest+1],al
    test byte[SA1DMAInfo],10h
    jnz near sa1chconv
    test byte[SA1DMAInfo],4
    jnz .noiram
    jmp sa1dmairam
.noiram
    ret
NEWSYM sa12237w
    mov [SA1DMADest+2],al
    test byte[SA1DMAInfo],10h
    jnz .nobwram
    test byte[SA1DMAInfo],4
    jz .nobwram
    jmp sa1dmabwram
.nobwram
    ret
NEWSYM sa12238w
    mov [SA1DMACount],al
    ret
NEWSYM sa12239w
    mov [SA1DMACount+1],al
    ret

SECTION .bss
NEWSYM sa1dmaptr, resd 1
NEWSYM sa1dmaptrs, resd 1

SECTION .text

NEWSYM sa1dmairam
    mov ebx,[SA1DMADest]
    and ebx,7FFh
    add ebx,IRAM
    mov [sa1dmaptr],ebx
    jmp executesa1dma
NEWSYM sa1dmabwram
    mov ebx,[SA1DMADest]
    and ebx,3FFFFh
    add ebx,[SA1RAMArea]
    mov [sa1dmaptr],ebx
executesa1dma:
    test byte[SA1DMAInfo],1
    jz .nobwram
    mov ebx,[SA1DMASource]
    and ebx,3FFFFh
    add ebx,[SA1RAMArea]
    mov [sa1dmaptrs],ebx
    jmp .doneram
.nobwram
    test byte[SA1DMAInfo],2
    jz .noiram
    mov ebx,[SA1DMASource]
    and ebx,7FFh
    add ebx,IRAM
    mov [sa1dmaptrs],ebx
    jmp .doneram
.noiram
    xor ebx,ebx
    mov bl,[SA1DMASource+2]
    mov ebx,[snesmmap+ebx*4]
    push ecx
    xor ecx,ecx
    mov cx,[SA1DMASource]
    add ebx,ecx
    mov [sa1dmaptrs],ebx
    pop ecx
.doneram
    push edx
    push eax
    push ecx
    mov ecx,[SA1DMACount]
    or ecx,ecx
    jz .notransfer
    mov ebx,[sa1dmaptrs]
    mov edx,[sa1dmaptr]
.loop
    mov al,[ebx]
    mov [edx],al
    inc ebx
    inc edx
    dec ecx
    jnz .loop
.notransfer
    pop ecx
    pop eax
    pop edx
    ret

SECTION .bss
tempblah resb 1

SECTION .text

%macro setbit2b 2
    test al,%1
    jz %%nosb
    or word[ebx],%2
%%nosb
%endmacro

%macro setbit2b2 2
    test al,%1
    jz %%nosb
    or word[ebx+16],%2
%%nosb
%endmacro

; Character Conversion DMA
sa1chconv:
;    or byte[SA1DoIRQ],4
    or byte[SA1DoIRQ],8
;    mov byte[debstop3],1


    mov ebx,[SA1DMADest]
%ifndef NO_DEBUGGER
    mov byte[debstop4],1
%endif
;    and ebx,7FFh
    and ebx,3FFFFh
    add ebx,[SA1RAMArea]
    mov [sa1dmaptr],ebx
    mov ebx,[SA1DMASource]
    and ebx,3FFFFh
    add ebx,[SA1RAMArea]
    mov [sa1dmaptrs],ebx
    ; 4 colors = 32 bytes, 16 colors = 64 bytes, 256 colors = 128 bytes
    ; SA1DMAChar,bit 2-4 = # of 8x8 tiles/horizontal row (0=1,1=2,2=3,..,5=32)
    ; SA1DMAChar,bit 0-1 = Color Mode (0=8b,1=4b,2=2b,3=?)
    test byte[SA1DMAChar],1
    jnz .4bit
    test byte[SA1DMAChar],2
    jnz near .2bit
    mov ebx,[sa1dmaptr]
    push ecx
    pop ecx
    ret
.4bit
    pushad
    mov edx,[sa1dmaptrs]
    mov ebx,[romdata]
    add ebx,4096*1024+1024*1024
    mov edi,16
.loop34b
    push ebx
    push edx
    mov ecx,32
.loop4b
    mov esi,8
    push ebx
    push edx
.loop24b
    mov word[ebx],0
    mov al,[edx+3]
    setbit2b 10h,0001h
    setbit2b 20h,0100h
    setbit2b2 40h,0001h
    setbit2b2 80h,0100h
    setbit2b 01h,0002h
    setbit2b 02h,0200h
    setbit2b2 04h,0002h
    setbit2b2 08h,0200h
    mov al,[edx+2]
    setbit2b 10h,0004h
    setbit2b 20h,0400h
    setbit2b2 40h,0004h
    setbit2b2 80h,0400h
    setbit2b 01h,0008h
    setbit2b 02h,0800h
    setbit2b2 04h,0008h
    setbit2b2 08h,0800h
    mov al,[edx+1]
    setbit2b 10h,0010h
    setbit2b 20h,1000h
    setbit2b2 40h,0010h
    setbit2b2 80h,1000h
    setbit2b 01h,0020h
    setbit2b 02h,2000h
    setbit2b2 04h,0020h
    setbit2b2 08h,2000h
    mov al,[edx]
    setbit2b 10h,0040h
    setbit2b 20h,4000h
    setbit2b2 40h,0040h
    setbit2b2 80h,4000h
    setbit2b 01h,0080h
    setbit2b 02h,8000h
    setbit2b2 04h,0080h
    setbit2b2 08h,8000h
    add ebx,2
    add edx,128
    dec esi
    jnz near .loop24b
    pop edx
    pop ebx
    add edx,4
    add ebx,32
    dec ecx
    jnz near .loop4b
    pop edx
    pop ebx
    add edx,128*8
    add ebx,128*8
    dec edi
    jnz near .loop34b

    mov ecx,10*128*8
    mov edx,[sa1dmaptrs]
    mov ebx,[romdata]
    add ebx,4096*1024+1024*1024
.next4b
    mov al,[ebx]
    mov [edx],al
    inc ebx
    inc edx
    dec ecx
    jnz .next4b

    popad
    ret

.2bit
    pushad
    mov edx,[sa1dmaptrs]
    mov ebx,[romdata]
    add ebx,4096*1024+1024*1024
    mov edi,16
.loop3
    push ebx
    push edx
    mov ecx,32
.loop
    mov esi,8
    push ebx
    push edx
.loop2
    mov word[ebx],0
    mov al,[edx+1]
    setbit2b 40h,0001h
    setbit2b 80h,0100h
    setbit2b 10h,0002h
    setbit2b 20h,0200h
    setbit2b 04h,0004h
    setbit2b 08h,0400h
    setbit2b 01h,0008h
    setbit2b 02h,0800h
    mov al,[edx]
    setbit2b 40h,0010h
    setbit2b 80h,1000h
    setbit2b 10h,0020h
    setbit2b 20h,2000h
    setbit2b 04h,0040h
    setbit2b 08h,4000h
    setbit2b 01h,0080h
    setbit2b 02h,8000h
    add ebx,2
    add edx,64
    dec esi
    jnz near .loop2
    pop edx
    pop ebx
    add edx,2
    add ebx,16
    dec ecx
    jnz near .loop
    pop edx
    pop ebx
    add edx,64*8
    add ebx,64*8
    dec edi
    jnz near .loop3

    mov ecx,10*64*8
    mov edx,[sa1dmaptrs]
    mov ebx,[romdata]
    add ebx,4096*1024+1024*1024
.next
    mov al,[ebx]
    mov [edx],al
    inc ebx
    inc edx
    dec ecx
    jnz .next

    popad
    ret
SECTION .bss
.numrows resd 1

SECTION .text

NEWSYM initSA1regs
    setreg 2300h*4,sa12300r
    setreg 2301h*4,sa12301r
    setreg 2302h*4,sa12302r
    setreg 2303h*4,sa12303r
    setreg 2304h*4,sa12304r
    setreg 2305h*4,sa12305r
    setreg 2306h*4,sa12306r
    setreg 2307h*4,sa12307r
    setreg 2308h*4,sa12308r
    setreg 2309h*4,sa12309r
    setreg 230Ah*4,sa1230Ar
    setreg 230Bh*4,sa1230Br
    setreg 230Ch*4,sa1230Cr
    setreg 230Dh*4,sa1230Dr
    setreg 230Eh*4,sa1230Er
    ; Set IRam, memory address 3000-37FF

    mov edi,3000h*4
    add edi,[regptr]
    mov eax,IRamRead
    mov ecx,800h
.loopr
    mov [edi],eax
    add edi,4
    dec ecx
    jnz .loopr
    ret

NEWSYM initSA1regsw
    setregw 2200h*4,sa12200w
    setregw 2201h*4,sa12201w
    setregw 2202h*4,sa12202w
    setregw 2203h*4,sa12203w
    setregw 2204h*4,sa12204w
    setregw 2205h*4,sa12205w
    setregw 2206h*4,sa12206w
    setregw 2207h*4,sa12207w
    setregw 2208h*4,sa12208w
    setregw 2209h*4,sa12209w
    setregw 220Ah*4,sa1220Aw
    setregw 220Bh*4,sa1220Bw
    setregw 220Ch*4,sa1220Cw
    setregw 220Dh*4,sa1220Dw
    setregw 220Eh*4,sa1220Ew
    setregw 220Fh*4,sa1220Fw
    setregw 2210h*4,sa12210w
    setregw 2211h*4,sa12211w
    setregw 2212h*4,sa12212w
    setregw 2213h*4,sa12213w
    setregw 2214h*4,sa12214w
    setregw 2215h*4,sa12215w

    setregw 2220h*4,sa12220w
    setregw 2221h*4,sa12221w
    setregw 2222h*4,sa12222w
    setregw 2223h*4,sa12223w

    setregw 2224h*4,sa12224w
    setregw 2225h*4,sa12225w
    ; Missing 2226-222A
    ; Missing 2240-224F (Bitmap register file)

    setregw 2230h*4,sa12230w
    setregw 2231h*4,sa12231w
    setregw 2232h*4,sa12232w
    setregw 2233h*4,sa12233w
    setregw 2234h*4,sa12234w
    setregw 2235h*4,sa12235w
    setregw 2236h*4,sa12236w
    setregw 2237h*4,sa12237w
    setregw 2238h*4,sa12238w
    setregw 2239h*4,sa12239w
    setregw 223Fh*4,sa1223Fw

    setregw 2250h*4,sa12250w
    setregw 2251h*4,sa12251w
    setregw 2252h*4,sa12252w
    setregw 2253h*4,sa12253w
    setregw 2254h*4,sa12254w

    setregw 2259h*4,sa12259w
    setregw 225Ah*4,sa1225Aw
    setregw 225Bh*4,sa1225Bw

    mov edi,3000h*4
    add edi,[regptw]
    mov eax,IRamWrite
    mov ecx,800h
.loopw
    mov [edi],eax
    add edi,4
    dec ecx
    jnz .loopw
    setregw 3000h*4,IRamWrite2
    ret

NEWSYM SDD1Reset
    setregw 4801h*4,sdd14801w
    setregw 4802h*4,dbstop
    setregw 4803h*4,dbstop
    setregw 4804h*4,sdd14804w
    setregw 4805h*4,sdd14805w
    setregw 4806h*4,sdd14806w
    setregw 4807h*4,sdd14807w
    setregw 4808h*4,dbstop
    setregw 4809h*4,dbstop
    setregw 480Ah*4,dbstop
    setregw 480Bh*4,dbstop
    setregw 480Ch*4,dbstop
    setregw 480Dh*4,dbstop
    setregw 480Eh*4,dbstop
    setregw 480Fh*4,dbstop
    ret

NEWSYM initSDD1regs
    setreg 4804h*4,sdd14804
    setreg 4805h*4,sdd14805
    setreg 4806h*4,sdd14806
    setreg 4807h*4,sdd14807
    ret

dbstop:
;    mov byte[debstop3],1
    ret

NEWSYM sdd14801w
    cmp al,0
    jne .notzero
    ret
.notzero
    mov byte[AddrNoIncr],0
    ; set banks C0h-FFh to decompressing routine
    push eax
    push ebx
    mov eax,memtabler8+0C0h*4
    mov ebx,40h
.loop
    mov dword[eax],memaccessbankr8sdd1
    add eax,4
    dec ebx
    jnz .loop
    mov dword[Sdd1Mode],1
    pop ebx
    pop eax
    ret