mirror of
https://github.com/RaySollium99/picodrive.git
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fa283c9a38
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@265 be3aeb3a-fb24-0410-a615-afba39da0efa
764 lines
22 KiB
C
764 lines
22 KiB
C
// This is part of Pico Library
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// (c) Copyright 2004 Dave, All rights reserved.
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// (c) Copyright 2006 notaz, All rights reserved.
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// Free for non-commercial use.
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// For commercial use, separate licencing terms must be obtained.
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#define __debug_io
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#include "PicoInt.h"
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#include "sound/ym2612.h"
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#include "sound/sn76496.h"
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#ifndef UTYPES_DEFINED
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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#define UTYPES_DEFINED
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#endif
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extern unsigned int lastSSRamWrite; // used by serial SRAM code
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#ifdef _ASM_MEMORY_C
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u32 PicoRead8(u32 a);
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u32 PicoRead16(u32 a);
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void PicoWrite8(u32 a,u8 d);
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void PicoWriteRomHW_SSF2(u32 a,u32 d);
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void PicoWriteRomHW_in1 (u32 a,u32 d);
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#endif
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#if defined(EMU_C68K) && defined(EMU_M68K)
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// cyclone debug mode
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u32 lastread_a, lastread_d[16]={0,}, lastwrite_cyc_d[16]={0,}, lastwrite_mus_d[16]={0,};
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int lrp_cyc=0, lrp_mus=0, lwp_cyc=0, lwp_mus=0;
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extern unsigned int ppop;
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#endif
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#ifdef IO_STATS
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void log_io(unsigned int addr, int bits, int rw);
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#else
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#define log_io(...)
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#endif
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#if defined(EMU_C68K) || defined(EMU_A68K)
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static __inline int PicoMemBase(u32 pc)
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{
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int membase=0;
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if (pc<Pico.romsize+4)
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{
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membase=(int)Pico.rom; // Program Counter in Rom
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}
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else if ((pc&0xe00000)==0xe00000)
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{
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membase=(int)Pico.ram-(pc&0xff0000); // Program Counter in Ram
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}
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else
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{
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// Error - Program Counter is invalid
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membase=(int)Pico.rom;
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}
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return membase;
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}
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#endif
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#ifdef EMU_A68K
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extern u8 *OP_ROM=NULL,*OP_RAM=NULL;
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#endif
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static u32 CPU_CALL PicoCheckPc(u32 pc)
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{
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u32 ret=0;
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#if defined(EMU_C68K)
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pc-=PicoCpu.membase; // Get real pc
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// pc&=0xfffffe;
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pc&=~1;
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if ((pc<<8) == 0)
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{
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printf("%i:%03i: game crash detected @ %06x\n", Pico.m.frame_count, Pico.m.scanline, SekPc);
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return (int)Pico.rom + Pico.romsize; // common crash condition, can happen if acc timing is off
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}
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PicoCpu.membase=PicoMemBase(pc&0x00ffffff);
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PicoCpu.membase-=pc&0xff000000;
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ret = PicoCpu.membase+pc;
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#elif defined(EMU_A68K)
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OP_ROM=(u8 *)PicoMemBase(pc);
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// don't bother calling us back unless it's outside the 64k segment
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M68000_regs.AsmBank=(pc>>16);
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#endif
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return ret;
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}
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PICO_INTERNAL int PicoInitPc(u32 pc)
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{
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PicoCheckPc(pc);
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return 0;
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}
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#ifndef _ASM_MEMORY_C
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PICO_INTERNAL_ASM void PicoMemReset(void)
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{
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}
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#endif
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// -----------------------------------------------------------------
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int PadRead(int i)
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{
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int pad,value,data_reg;
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pad=~PicoPad[i]; // Get inverse of pad MXYZ SACB RLDU
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data_reg=Pico.ioports[i+1];
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// orr the bits, which are set as output
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value = data_reg&(Pico.ioports[i+4]|0x80);
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if(PicoOpt & 0x20) { // 6 button gamepad enabled
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int phase = Pico.m.padTHPhase[i];
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if(phase == 2 && !(data_reg&0x40)) { // TH
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value|=(pad&0xc0)>>2; // ?0SA 0000
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return value;
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} else if(phase == 3) {
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if(data_reg&0x40)
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value|=(pad&0x30)|((pad>>8)&0xf); // ?1CB MXYZ
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else
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value|=((pad&0xc0)>>2)|0x0f; // ?0SA 1111
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return value;
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}
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}
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if(data_reg&0x40) // TH
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value|=(pad&0x3f); // ?1CB RLDU
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else value|=((pad&0xc0)>>2)|(pad&3); // ?0SA 00DU
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return value; // will mirror later
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}
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#ifndef _ASM_MEMORY_C
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static
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#endif
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u32 SRAMRead(u32 a)
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{
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unsigned int sreg = Pico.m.sram_reg;
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if(!(sreg & 0x10) && (sreg & 1) && a > 0x200001) { // not yet detected SRAM
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elprintf(EL_SRAMIO, "normal sram detected.");
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Pico.m.sram_reg|=0x10; // should be normal SRAM
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}
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if(sreg & 4) // EEPROM read
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return SRAMReadEEPROM();
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else // if(sreg & 1) // (sreg&5) is one of prerequisites
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return *(u8 *)(SRam.data-SRam.start+a);
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}
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static void SRAMWrite(u32 a, u32 d)
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{
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unsigned int sreg = Pico.m.sram_reg;
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if(!(sreg & 0x10)) {
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// not detected SRAM
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if((a&~1)==0x200000) {
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elprintf(EL_SRAMIO, "eeprom detected.");
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sreg|=4; // this should be a game with EEPROM (like NBA Jam)
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SRam.start=0x200000; SRam.end=SRam.start+1;
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} else
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elprintf(EL_SRAMIO, "normal sram detected.");
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sreg|=0x10;
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Pico.m.sram_reg=sreg;
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}
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if(sreg & 4) { // EEPROM write
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// this diff must be at most 16 for NBA Jam to work
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if(SekCyclesDoneT()-lastSSRamWrite < 16) {
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// just update pending state
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elprintf(EL_EEPROM, "eeprom: skip because cycles=%i", SekCyclesDoneT()-lastSSRamWrite);
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SRAMUpdPending(a, d);
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} else {
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int old=sreg;
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SRAMWriteEEPROM(sreg>>6); // execute pending
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SRAMUpdPending(a, d);
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if ((old^Pico.m.sram_reg)&0xc0) // update time only if SDA/SCL changed
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lastSSRamWrite = SekCyclesDoneT();
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}
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} else if(!(sreg & 2)) {
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u8 *pm=(u8 *)(SRam.data-SRam.start+a);
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if(*pm != (u8)d) {
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SRam.changed = 1;
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*pm=(u8)d;
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}
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}
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}
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// for nonstandard reads
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#ifndef _ASM_MEMORY_C
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static
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#endif
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u32 OtherRead16End(u32 a, int realsize)
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{
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u32 d=0;
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// for games with simple protection devices, discovered by Haze
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// some dumb detection is used, but that should be enough to make things work
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if ((a>>22) == 1 && Pico.romsize >= 512*1024) {
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if (*(int *)(Pico.rom+0x123e4) == 0x00550c39 && *(int *)(Pico.rom+0x123e8) == 0x00000040) { // Super Bubble Bobble (Unl) [!]
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if (a == 0x400000) { d=0x55<<8; goto end; }
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else if (a == 0x400002) { d=0x0f<<8; goto end; }
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}
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else if (*(int *)(Pico.rom+0x008c4) == 0x66240055 && *(int *)(Pico.rom+0x008c8) == 0x00404df9) { // Smart Mouse (Unl)
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if (a == 0x400000) { d=0x55<<8; goto end; }
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else if (a == 0x400002) { d=0x0f<<8; goto end; }
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else if (a == 0x400004) { d=0xaa<<8; goto end; }
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else if (a == 0x400006) { d=0xf0<<8; goto end; }
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}
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else if (*(int *)(Pico.rom+0x00404) == 0x00a90600 && *(int *)(Pico.rom+0x00408) == 0x6708b013) { // King of Fighters '98, The (Unl) [!]
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if (a == 0x480000 || a == 0x4800e0 || a == 0x4824a0 || a == 0x488880) { d=0xaa<<8; goto end; }
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else if (a == 0x4a8820) { d=0x0a<<8; goto end; }
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// there is also a read @ 0x4F8820 which needs 0, but that is returned in default case
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}
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else if (*(int *)(Pico.rom+0x01b24) == 0x004013f9 && *(int *)(Pico.rom+0x01b28) == 0x00ff0000) { // Mahjong Lover (Unl) [!]
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if (a == 0x400000) { d=0x90<<8; goto end; }
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else if (a == 0x401000) { d=0xd3<<8; goto end; } // this one doesn't seem to be needed, the code does 2 comparisons and only then
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// checks the result, which is of the above one. Left it just in case.
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}
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else if (*(int *)(Pico.rom+0x05254) == 0x0c3962d0 && *(int *)(Pico.rom+0x05258) == 0x00400055) { // Elf Wor (Unl)
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if (a == 0x400000) { d=0x55<<8; goto end; }
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else if (a == 0x400004) { d=0xc9<<8; goto end; } // this check is done if the above one fails
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else if (a == 0x400002) { d=0x0f<<8; goto end; }
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else if (a == 0x400006) { d=0x18<<8; goto end; } // similar to above
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}
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// our default behaviour is to return whatever was last written a 0x400000-0x7fffff range (used by Squirrel King (R) [!])
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// Lion King II, The (Unl) [!] writes @ 400000 and wants to get that val @ 400002 and wites another val
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// @ 400004 which is expected @ 400006, so we really remember 2 values here
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d = Pico.m.prot_bytes[(a>>2)&1]<<8;
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}
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else if (a == 0xa13000 && Pico.romsize >= 1024*1024) {
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if (*(int *)(Pico.rom+0xc8af0) == 0x30133013 && *(int *)(Pico.rom+0xc8af4) == 0x000f0240) { // Rockman X3 (Unl) [!]
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d=0x0c; goto end;
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}
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else if (*(int *)(Pico.rom+0x28888) == 0x07fc0000 && *(int *)(Pico.rom+0x2888c) == 0x4eb94e75) { // Bug's Life, A (Unl) [!]
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d=0x28; goto end; // does the check from RAM
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}
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else if (*(int *)(Pico.rom+0xc8778) == 0x30133013 && *(int *)(Pico.rom+0xc877c) == 0x000f0240) { // Super Mario Bros. (Unl) [!]
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d=0x0c; goto end; // seems to be the same code as in Rockman X3 (Unl) [!]
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}
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else if (*(int *)(Pico.rom+0xf20ec) == 0x30143013 && *(int *)(Pico.rom+0xf20f0) == 0x000f0200) { // Super Mario 2 1998 (Unl) [!]
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d=0x0a; goto end;
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}
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}
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else if (a == 0xa13002) { // Pocket Monsters (Unl)
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d=0x01; goto end;
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}
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else if (a == 0xa1303E) { // Pocket Monsters (Unl)
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d=0x1f; goto end;
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}
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else if (a == 0x30fe02) {
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// Virtua Racing - just for fun
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// this seems to be some flag that SVP is ready or something similar
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d=1; goto end;
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}
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end:
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elprintf(EL_UIO, "strange r%i: [%06x] %04x @%06x", realsize, a&0xffffff, d, SekPc);
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return d;
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}
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//extern UINT32 mz80GetRegisterValue(void *, UINT32);
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static void OtherWrite8End(u32 a,u32 d,int realsize)
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{
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// sram
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if(a >= SRam.start && a <= SRam.end) {
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elprintf(EL_SRAMIO, "sram w8 [%06x] %02x @ %06x", a, d, SekPc);
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SRAMWrite(a, d);
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return;
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}
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#ifdef _ASM_MEMORY_C
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// special ROM hardware (currently only banking and sram reg supported)
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if((a&0xfffff1) == 0xA130F1) {
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PicoWriteRomHW_SSF2(a, d); // SSF2 or SRAM
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return;
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}
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#else
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// sram access register
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if(a == 0xA130F1) {
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elprintf(EL_SRAMIO, "sram reg=%02x", d);
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Pico.m.sram_reg &= ~3;
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Pico.m.sram_reg |= (u8)(d&3);
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return;
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}
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#endif
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elprintf(EL_UIO, "strange w%i: %06x, %08x @%06x", realsize, a&0xffffff, d, SekPc);
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if(a >= 0xA13004 && a < 0xA13040) {
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// dumb 12-in-1 or 4-in-1 banking support
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int len;
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a &= 0x3f; a <<= 16;
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len = Pico.romsize - a;
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if (len <= 0) return; // invalid/missing bank
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if (len > 0x200000) len = 0x200000; // 2 megs
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memcpy(Pico.rom, Pico.rom+a, len); // code which does this is in RAM so this is safe.
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return;
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}
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// for games with simple protection devices, discovered by Haze
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else if ((a>>22) == 1)
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Pico.m.prot_bytes[(a>>2)&1] = (u8)d;
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}
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#include "MemoryCmn.c"
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// -----------------------------------------------------------------
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// Read Rom and read Ram
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#ifndef _ASM_MEMORY_C
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PICO_INTERNAL_ASM u32 CPU_CALL PicoRead8(u32 a)
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{
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u32 d=0;
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if ((a&0xe00000)==0xe00000) { d = *(u8 *)(Pico.ram+((a^1)&0xffff)); goto end; } // Ram
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a&=0xffffff;
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#if !(defined(EMU_C68K) && defined(EMU_M68K))
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// sram
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if(a >= SRam.start && a <= SRam.end && (Pico.m.sram_reg&5)) {
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d = SRAMRead(a);
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elprintf(EL_SRAMIO, "sram r8 [%06x] %02x @ %06x", a, d, SekPc);
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goto end;
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}
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#endif
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if (a<Pico.romsize) { d = *(u8 *)(Pico.rom+(a^1)); goto end; } // Rom
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log_io(a, 8, 0);
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if ((a&0xff4000)==0xa00000) { d=z80Read8(a); goto end; } // Z80 Ram
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d=OtherRead16(a&~1, 8); if ((a&1)==0) d>>=8;
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end:
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#ifdef __debug_io
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dprintf("r8 : %06x, %02x @%06x", a&0xffffff, (u8)d, SekPc);
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#endif
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#if defined(EMU_C68K) && defined(EMU_M68K)
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if(a>=Pico.romsize/*&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b*/) {
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lastread_a = a;
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lastread_d[lrp_cyc++&15] = (u8)d;
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}
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#endif
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return d;
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}
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PICO_INTERNAL_ASM u32 CPU_CALL PicoRead16(u32 a)
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{
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u32 d=0;
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if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram
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a&=0xfffffe;
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#if !(defined(EMU_C68K) && defined(EMU_M68K))
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// sram
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if(a >= SRam.start && a <= SRam.end && (Pico.m.sram_reg&5)) {
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d = SRAMRead(a);
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d |= d<<8;
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elprintf(EL_SRAMIO, "sram r16 [%06x] %04x @ %06x", a, d, SekPc);
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goto end;
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}
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#endif
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if (a<Pico.romsize) { d = *(u16 *)(Pico.rom+a); goto end; } // Rom
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log_io(a, 16, 0);
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d = OtherRead16(a, 16);
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end:
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#ifdef __debug_io
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dprintf("r16: %06x, %04x @%06x", a&0xffffff, d, SekPc);
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#endif
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#if defined(EMU_C68K) && defined(EMU_M68K)
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if(a>=Pico.romsize/*&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b*/) {
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lastread_a = a;
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lastread_d[lrp_cyc++&15] = d;
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}
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#endif
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return d;
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}
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PICO_INTERNAL_ASM u32 CPU_CALL PicoRead32(u32 a)
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{
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u32 d=0;
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if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); d = (pm[0]<<16)|pm[1]; goto end; } // Ram
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a&=0xfffffe;
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// sram
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if(a >= SRam.start && a <= SRam.end && (Pico.m.sram_reg&5)) {
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d = (SRAMRead(a)<<16)|SRAMRead(a+2);
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d |= d<<8;
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elprintf(EL_SRAMIO, "sram r32 [%06x] %08x @ %06x", a, d, SekPc);
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goto end;
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}
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if (a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+a); d = (pm[0]<<16)|pm[1]; goto end; } // Rom
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log_io(a, 32, 0);
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d = (OtherRead16(a, 32)<<16)|OtherRead16(a+2, 32);
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end:
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#ifdef __debug_io
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dprintf("r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
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#endif
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#if defined(EMU_C68K) && defined(EMU_M68K)
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if(a>=Pico.romsize/*&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b*/) {
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lastread_a = a;
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lastread_d[lrp_cyc++&15] = d;
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}
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#endif
|
|
return d;
|
|
}
|
|
#endif
|
|
|
|
// -----------------------------------------------------------------
|
|
// Write Ram
|
|
|
|
#ifndef _ASM_MEMORY_C
|
|
PICO_INTERNAL_ASM void CPU_CALL PicoWrite8(u32 a,u8 d)
|
|
{
|
|
#ifdef __debug_io
|
|
dprintf("w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
|
|
#endif
|
|
#if defined(EMU_C68K) && defined(EMU_M68K)
|
|
lastwrite_cyc_d[lwp_cyc++&15] = d;
|
|
#endif
|
|
//if ((a&0xe0ffff)==0xe0a9ba+0x69c)
|
|
//if(a==0x200000||a==0x200001) printf("w8 : %02x [%06x] @ %06x [%i]\n", d, a, SekPc, SekCyclesDoneT());
|
|
// dprintf("w8 : %06x, %02x @%06x", a&0xffffff, d, SekPc);
|
|
|
|
if ((a&0xe00000)==0xe00000) { *(u8 *)(Pico.ram+((a^1)&0xffff))=d; return; } // Ram
|
|
log_io(a, 8, 1);
|
|
|
|
a&=0xffffff;
|
|
OtherWrite8(a,d);
|
|
}
|
|
#endif
|
|
|
|
void CPU_CALL PicoWrite16(u32 a,u16 d)
|
|
{
|
|
#ifdef __debug_io
|
|
dprintf("w16: %06x, %04x", a&0xffffff, d);
|
|
#endif
|
|
#if defined(EMU_C68K) && defined(EMU_M68K)
|
|
lastwrite_cyc_d[lwp_cyc++&15] = d;
|
|
#endif
|
|
|
|
if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram
|
|
log_io(a, 16, 1);
|
|
|
|
a&=0xfffffe;
|
|
OtherWrite16(a,d);
|
|
}
|
|
|
|
static void CPU_CALL PicoWrite32(u32 a,u32 d)
|
|
{
|
|
#ifdef __debug_io
|
|
dprintf("w32: %06x, %08x", a&0xffffff, d);
|
|
#endif
|
|
#if defined(EMU_C68K) && defined(EMU_M68K)
|
|
lastwrite_cyc_d[lwp_cyc++&15] = d;
|
|
#endif
|
|
|
|
if ((a&0xe00000)==0xe00000)
|
|
{
|
|
// Ram:
|
|
u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));
|
|
pm[0]=(u16)(d>>16); pm[1]=(u16)d;
|
|
return;
|
|
}
|
|
log_io(a, 32, 1);
|
|
|
|
a&=0xfffffe;
|
|
OtherWrite16(a, (u16)(d>>16));
|
|
OtherWrite16(a+2,(u16)d);
|
|
}
|
|
|
|
|
|
// -----------------------------------------------------------------
|
|
PICO_INTERNAL void PicoMemSetup(void)
|
|
{
|
|
#ifdef EMU_C68K
|
|
// Setup memory callbacks:
|
|
PicoCpu.checkpc=PicoCheckPc;
|
|
PicoCpu.fetch8 =PicoCpu.read8 =PicoRead8;
|
|
PicoCpu.fetch16=PicoCpu.read16=PicoRead16;
|
|
PicoCpu.fetch32=PicoCpu.read32=PicoRead32;
|
|
PicoCpu.write8 =PicoWrite8;
|
|
PicoCpu.write16=PicoWrite16;
|
|
PicoCpu.write32=PicoWrite32;
|
|
#endif
|
|
}
|
|
|
|
#ifdef EMU_A68K
|
|
struct A68KInter
|
|
{
|
|
u32 unknown;
|
|
u8 (__fastcall *Read8) (u32 a);
|
|
u16 (__fastcall *Read16)(u32 a);
|
|
u32 (__fastcall *Read32)(u32 a);
|
|
void (__fastcall *Write8) (u32 a,u8 d);
|
|
void (__fastcall *Write16) (u32 a,u16 d);
|
|
void (__fastcall *Write32) (u32 a,u32 d);
|
|
void (__fastcall *ChangePc)(u32 a);
|
|
u8 (__fastcall *PcRel8) (u32 a);
|
|
u16 (__fastcall *PcRel16)(u32 a);
|
|
u32 (__fastcall *PcRel32)(u32 a);
|
|
u16 (__fastcall *Dir16)(u32 a);
|
|
u32 (__fastcall *Dir32)(u32 a);
|
|
};
|
|
|
|
struct A68KInter a68k_memory_intf=
|
|
{
|
|
0,
|
|
PicoRead8,
|
|
PicoRead16,
|
|
PicoRead32,
|
|
PicoWrite8,
|
|
PicoWrite16,
|
|
PicoWrite32,
|
|
PicoCheckPc,
|
|
PicoRead8,
|
|
PicoRead16,
|
|
PicoRead32,
|
|
PicoRead16, // unused
|
|
PicoRead32, // unused
|
|
};
|
|
#endif
|
|
|
|
#ifdef EMU_M68K
|
|
unsigned int m68k_read_pcrelative_CD8 (unsigned int a);
|
|
unsigned int m68k_read_pcrelative_CD16(unsigned int a);
|
|
unsigned int m68k_read_pcrelative_CD32(unsigned int a);
|
|
|
|
// these are allowed to access RAM
|
|
static unsigned int m68k_read_8 (unsigned int a, int do_fake) {
|
|
a&=0xffffff;
|
|
if(PicoMCD&1) return m68k_read_pcrelative_CD8(a);
|
|
if(a<Pico.romsize) return *(u8 *)(Pico.rom+(a^1)); // Rom
|
|
#ifdef EMU_C68K
|
|
if(do_fake&&((ppop&0x3f)==0x3a||(ppop&0x3f)==0x3b)) return lastread_d[lrp_mus++&15];
|
|
#endif
|
|
if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram
|
|
return 0;
|
|
}
|
|
static unsigned int m68k_read_16(unsigned int a, int do_fake) {
|
|
a&=0xffffff;
|
|
if(PicoMCD&1) return m68k_read_pcrelative_CD16(a);
|
|
if(a<Pico.romsize) return *(u16 *)(Pico.rom+(a&~1)); // Rom
|
|
#ifdef EMU_C68K
|
|
if(do_fake&&((ppop&0x3f)==0x3a||(ppop&0x3f)==0x3b)) return lastread_d[lrp_mus++&15];
|
|
#endif
|
|
if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram
|
|
return 0;
|
|
}
|
|
static unsigned int m68k_read_32(unsigned int a, int do_fake) {
|
|
a&=0xffffff;
|
|
if(PicoMCD&1) return m68k_read_pcrelative_CD32(a);
|
|
if(a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+(a&~1)); return (pm[0]<<16)|pm[1]; }
|
|
#ifdef EMU_C68K
|
|
if(do_fake&&((ppop&0x3f)==0x3a||(ppop&0x3f)==0x3b)) return lastread_d[lrp_mus++&15];
|
|
#endif
|
|
if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram
|
|
return 0;
|
|
}
|
|
|
|
unsigned int m68k_read_pcrelative_8 (unsigned int a) { return m68k_read_8 (a, 1); }
|
|
unsigned int m68k_read_pcrelative_16(unsigned int a) { return m68k_read_16(a, 1); }
|
|
unsigned int m68k_read_pcrelative_32(unsigned int a) { return m68k_read_32(a, 1); }
|
|
unsigned int m68k_read_immediate_16(unsigned int a) { return m68k_read_16(a, 0); }
|
|
unsigned int m68k_read_immediate_32(unsigned int a) { return m68k_read_32(a, 0); }
|
|
unsigned int m68k_read_disassembler_8 (unsigned int a) { return m68k_read_8 (a, 0); }
|
|
unsigned int m68k_read_disassembler_16(unsigned int a) { return m68k_read_16(a, 0); }
|
|
unsigned int m68k_read_disassembler_32(unsigned int a) { return m68k_read_32(a, 0); }
|
|
|
|
#ifdef EMU_C68K
|
|
// ROM only
|
|
unsigned int m68k_read_memory_8(unsigned int a)
|
|
{
|
|
u8 d;
|
|
if(a<Pico.romsize) d = *(u8 *) (Pico.rom+(a^1));
|
|
else d = (u8) lastread_d[lrp_mus++&15];
|
|
#ifdef __debug_io
|
|
dprintf("r8_mu : %06x, %02x @%06x", a&0xffffff, d, SekPc);
|
|
#endif
|
|
return d;
|
|
}
|
|
unsigned int m68k_read_memory_16(unsigned int a)
|
|
{
|
|
u16 d;
|
|
if(a<Pico.romsize) d = *(u16 *)(Pico.rom+(a&~1));
|
|
else d = (u16) lastread_d[lrp_mus++&15];
|
|
#ifdef __debug_io
|
|
dprintf("r16_mu: %06x, %04x @%06x", a&0xffffff, d, SekPc);
|
|
#endif
|
|
return d;
|
|
}
|
|
unsigned int m68k_read_memory_32(unsigned int a)
|
|
{
|
|
u32 d;
|
|
if(a<Pico.romsize) {u16 *pm=(u16 *)(Pico.rom+(a&~1));d=(pm[0]<<16)|pm[1];}
|
|
else d = lastread_d[lrp_mus++&15];
|
|
#ifdef __debug_io
|
|
dprintf("r32_mu: %06x, %08x @%06x", a&0xffffff, d, SekPc);
|
|
#endif
|
|
return d;
|
|
}
|
|
|
|
// ignore writes, Cyclone already done that
|
|
void m68k_write_memory_8(unsigned int address, unsigned int value) { lastwrite_mus_d[lwp_mus++&15] = value; }
|
|
void m68k_write_memory_16(unsigned int address, unsigned int value) { lastwrite_mus_d[lwp_mus++&15] = value; }
|
|
void m68k_write_memory_32(unsigned int address, unsigned int value) { lastwrite_mus_d[lwp_mus++&15] = value; }
|
|
#else
|
|
unsigned char PicoReadCD8w (unsigned int a);
|
|
unsigned short PicoReadCD16w(unsigned int a);
|
|
unsigned int PicoReadCD32w(unsigned int a);
|
|
void PicoWriteCD8w (unsigned int a, unsigned char d);
|
|
void PicoWriteCD16w(unsigned int a, unsigned short d);
|
|
void PicoWriteCD32w(unsigned int a, unsigned int d);
|
|
|
|
/* it appears that Musashi doesn't always mask the unused bits */
|
|
unsigned int m68k_read_memory_8(unsigned int address)
|
|
{
|
|
unsigned int d = (PicoMCD&1) ? PicoReadCD8w(address) : PicoRead8(address);
|
|
return d&0xff;
|
|
}
|
|
|
|
unsigned int m68k_read_memory_16(unsigned int address)
|
|
{
|
|
unsigned int d = (PicoMCD&1) ? PicoReadCD16w(address) : PicoRead16(address);
|
|
return d&0xffff;
|
|
}
|
|
|
|
unsigned int m68k_read_memory_32(unsigned int address)
|
|
{
|
|
return (PicoMCD&1) ? PicoReadCD32w(address) : PicoRead32(address);
|
|
}
|
|
|
|
void m68k_write_memory_8(unsigned int address, unsigned int value)
|
|
{
|
|
if (PicoMCD&1) PicoWriteCD8w(address, (u8)value); else PicoWrite8(address, (u8)value);
|
|
}
|
|
|
|
void m68k_write_memory_16(unsigned int address, unsigned int value)
|
|
{
|
|
if (PicoMCD&1) PicoWriteCD16w(address,(u16)value); else PicoWrite16(address,(u16)value);
|
|
}
|
|
|
|
void m68k_write_memory_32(unsigned int address, unsigned int value)
|
|
{
|
|
if (PicoMCD&1) PicoWriteCD32w(address, value); else PicoWrite32(address, value);
|
|
}
|
|
#endif
|
|
#endif // EMU_M68K
|
|
|
|
|
|
// -----------------------------------------------------------------
|
|
// z80 memhandlers
|
|
|
|
PICO_INTERNAL unsigned char z80_read(unsigned short a)
|
|
{
|
|
u8 ret = 0;
|
|
|
|
if ((a>>13)==2) // 0x4000-0x5fff (Charles MacDonald)
|
|
{
|
|
if(PicoOpt&1) ret = (u8) YM2612Read();
|
|
goto end;
|
|
}
|
|
|
|
if (a>=0x8000)
|
|
{
|
|
u32 addr68k;
|
|
addr68k=Pico.m.z80_bank68k<<15;
|
|
addr68k+=a&0x7fff;
|
|
|
|
ret = (u8) PicoRead8(addr68k);
|
|
elprintf(EL_Z80BNK, "z80->68k r8 [%06x] %02x", addr68k, ret);
|
|
goto end;
|
|
}
|
|
|
|
// should not be needed || dprintf("z80_read RAM");
|
|
if (a<0x4000) { ret = (u8) Pico.zram[a&0x1fff]; goto end; }
|
|
|
|
elprintf(EL_ANOMALY, "z80 invalid r8 [%06x] %02x", a, ret);
|
|
|
|
end:
|
|
return ret;
|
|
}
|
|
|
|
PICO_INTERNAL unsigned short z80_read16(unsigned short a)
|
|
{
|
|
//dprintf("z80_read16");
|
|
|
|
return (u16) ( (u16)z80_read(a) | ((u16)z80_read((u16)(a+1))<<8) );
|
|
}
|
|
|
|
PICO_INTERNAL_ASM void z80_write(unsigned char data, unsigned short a)
|
|
{
|
|
//if (a<0x4000)
|
|
// dprintf("z80 w8 : %06x, %02x @%04x", a, data, mz80GetRegisterValue(NULL, 0));
|
|
|
|
if ((a>>13)==2) // 0x4000-0x5fff (Charles MacDonald)
|
|
{
|
|
if(PicoOpt&1) emustatus|=YM2612Write(a, data) & 1;
|
|
return;
|
|
}
|
|
|
|
if ((a&0xfff9)==0x7f11) // 7f11 7f13 7f15 7f17
|
|
{
|
|
if(PicoOpt&2) SN76496Write(data);
|
|
return;
|
|
}
|
|
|
|
if ((a>>8)==0x60)
|
|
{
|
|
Pico.m.z80_bank68k>>=1;
|
|
Pico.m.z80_bank68k|=(data&1)<<8;
|
|
Pico.m.z80_bank68k&=0x1ff; // 9 bits and filled in the new top one
|
|
return;
|
|
}
|
|
|
|
if (a>=0x8000)
|
|
{
|
|
u32 addr68k;
|
|
addr68k=Pico.m.z80_bank68k<<15;
|
|
addr68k+=a&0x7fff;
|
|
elprintf(EL_Z80BNK, "z80->68k w8 [%06x] %02x", addr68k, data);
|
|
PicoWrite8(addr68k, data);
|
|
return;
|
|
}
|
|
|
|
// should not be needed, drZ80 knows how to access RAM itself || dprintf("z80_write RAM @ %08x", lr);
|
|
if (a<0x4000) { Pico.zram[a&0x1fff]=data; return; }
|
|
|
|
elprintf(EL_ANOMALY, "z80 invalid w8 [%06x] %02x", a, data);
|
|
}
|
|
|
|
PICO_INTERNAL void z80_write16(unsigned short data, unsigned short a)
|
|
{
|
|
//dprintf("z80_write16");
|
|
|
|
z80_write((unsigned char) data,a);
|
|
z80_write((unsigned char)(data>>8),(u16)(a+1));
|
|
}
|
|
|