sram handling refactored

[picodrive.git] / Pico / Area.c

// This is part of Pico Library\r
\r
// (c) Copyright 2004 Dave, All rights reserved.\r
// (c) Copyright 2006 notaz, All rights reserved.\r
// Free for non-commercial use.\r
\r
// For commercial use, separate licencing terms must be obtained.\r
\r
\r
#include "PicoInt.h"\r
\r
// ym2612\r
#include "sound/ym2612.h"\r
\r
// sn76496\r
extern int *sn76496_regs;\r
\r
\r
struct PicoArea { void *data; int len; char *name; };\r
\r
// strange observation on Symbian OS 9.1, m600 organizer fw r3a06:\r
// taking an address of fread or fwrite causes "application could't be started" error\r
// on startup randomly depending on binary layout of executable file.\r
\r
arearw    *areaRead  = (arearw *) 0; // fread;  // read and write function pointers for\r
arearw    *areaWrite = (arearw *) 0; // fwrite; // gzip save state ability\r
areaeof   *areaEof   = (areaeof *) 0;\r
areaseek  *areaSeek  = (areaseek *) 0;\r
areaclose *areaClose = (areaclose *) 0;\r
\r
\r
// Scan one variable and callback\r
static int ScanVar(void *data,int len,char *name,void *PmovFile,int PmovAction)\r
{\r
  int ret = 0;\r
  if ((PmovAction&3)==1) ret = areaWrite(data,1,len,PmovFile);\r
  if ((PmovAction&3)==2) ret = areaRead (data,1,len,PmovFile);\r
  return (ret != len);\r
}\r
\r
#define SCAN_VAR(x,y) ScanVar(&x,sizeof(x),y,PmovFile,PmovAction);\r
#define SCANP(x)      ScanVar(&Pico.x,sizeof(Pico.x),#x,PmovFile,PmovAction);\r
\r
// Pack the cpu into a common format:\r
PICO_INTERNAL int PicoAreaPackCpu(unsigned char *cpu, int is_sub)\r
{\r
  unsigned int pc=0;\r
\r
#ifdef EMU_A68K\r
  memcpy(cpu,M68000_regs.d,0x40);\r
  pc=M68000_regs.pc;\r
  *(unsigned char *)(cpu+0x44)=(unsigned char)M68000_regs.ccr;\r
  *(unsigned char *)(cpu+0x45)=(unsigned char)M68000_regs.srh;\r
  *(unsigned int  *)(cpu+0x48)=M68000_regs.isp;\r
  cpu[0x4c] = M68000_regs.irq;\r
  // stop flag?\r
#endif\r
\r
#ifdef EMU_C68K\r
  struct Cyclone *context = is_sub ? &PicoCpuS68k : &PicoCpu;\r
  memcpy(cpu,context->d,0x40);\r
  pc=context->pc-context->membase;\r
  *(unsigned int *)(cpu+0x44)=CycloneGetSr(context);\r
  *(unsigned int *)(cpu+0x48)=context->osp;\r
  cpu[0x4c] = context->irq;\r
  cpu[0x4d] = context->state_flags & 1;\r
#endif\r
\r
#ifdef EMU_M68K\r
  void *oldcontext = m68ki_cpu_p;\r
  m68k_set_context(is_sub ? &PicoS68kCPU : &PicoM68kCPU);\r
  memcpy(cpu,m68ki_cpu_p->dar,0x40);\r
  pc=m68ki_cpu_p->pc;\r
  *(unsigned int  *)(cpu+0x44)=m68k_get_reg(NULL, M68K_REG_SR);\r
  *(unsigned int  *)(cpu+0x48)=m68ki_cpu_p->sp[0];\r
  cpu[0x4c] = CPU_INT_LEVEL>>8;\r
  cpu[0x4d] = CPU_STOPPED;\r
  m68k_set_context(oldcontext);\r
#endif\r
\r
  *(unsigned int *)(cpu+0x40)=pc;\r
  return 0;\r
}\r
\r
PICO_INTERNAL int PicoAreaUnpackCpu(unsigned char *cpu, int is_sub)\r
{\r
#ifdef EMU_A68K\r
  memcpy(M68000_regs.d,cpu,0x40);\r
  M68000_regs.pc=pc;\r
  M68000_regs.ccr=*(unsigned char *)(cpu+0x44);\r
  M68000_regs.srh=*(unsigned char *)(cpu+0x45);\r
  M68000_regs.isp=*(unsigned int  *)(cpu+0x48);\r
  M68000_regs.irq = cpu[0x4c];\r
  // stop flag?\r
#endif\r
\r
#ifdef EMU_C68K\r
  struct Cyclone *context = is_sub ? &PicoCpuS68k : &PicoCpu;\r
  CycloneSetSr(context, *(unsigned int  *)(cpu+0x44));\r
  context->osp=*(unsigned int  *)(cpu+0x48);\r
  memcpy(context->d,cpu,0x40);\r
  context->membase=0;\r
  context->pc = context->checkpc(*(unsigned int *)(cpu+0x40)); // Base pc\r
  context->irq = cpu[0x4c];\r
  context->state_flags = 0;\r
  if (cpu[0x4d])\r
    context->state_flags |= 1;\r
#endif\r
\r
#ifdef EMU_M68K\r
  void *oldcontext = m68ki_cpu_p;\r
  m68k_set_context(is_sub ? &PicoS68kCPU : &PicoM68kCPU);\r
  memcpy(m68ki_cpu_p->dar,cpu,0x40);\r
  m68ki_cpu_p->pc=*(unsigned int *)(cpu+0x40);\r
  m68k_set_reg(M68K_REG_SR, *(unsigned int *)(cpu+0x44));\r
  m68ki_cpu_p->sp[0]=*(unsigned int *)(cpu+0x48);\r
  CPU_INT_LEVEL = cpu[0x4c] << 8;\r
  CPU_STOPPED = cpu[0x4d];\r
  m68k_set_context(oldcontext);\r
#endif\r
  return 0;\r
}\r
\r
// Scan the contents of the virtual machine's memory for saving or loading\r
static int PicoAreaScan(int PmovAction,unsigned int ver, void *PmovFile)\r
{\r
  void *ym2612_regs;\r
  unsigned char cpu[0x60];\r
  unsigned char cpu_z80[0x60];\r
  int ret;\r
\r
  memset(&cpu,0,sizeof(cpu));\r
  memset(&cpu_z80,0,sizeof(cpu_z80));\r
\r
  ym2612_regs = YM2612GetRegs();\r
\r
  if (PmovAction&4)\r
  {\r
    Pico.m.scanline=0;\r
\r
    // Scan all the memory areas:\r
    SCANP(ram) SCANP(vram) SCANP(zram) SCANP(cram) SCANP(vsram)\r
\r
    // Pack, scan and unpack the cpu data:\r
    if((PmovAction&3)==1) PicoAreaPackCpu(cpu, 0);\r
    //SekInit();     // notaz: do we really have to do this here?\r
    //PicoMemInit();\r
    SCAN_VAR(cpu,"cpu")\r
    if((PmovAction&3)==2) PicoAreaUnpackCpu(cpu, 0);\r
\r
    SCAN_VAR(Pico.m    ,"misc")\r
    SCAN_VAR(Pico.video,"video")\r
\r
    // notaz: save/load z80, YM2612, sn76496 states instead of Pico.s (which is unused anyway)\r
    if(PicoOpt&7) {\r
      if((PmovAction&3)==1) z80_pack(cpu_z80);\r
      ret = SCAN_VAR(cpu_z80,"cpu_z80")\r
      // do not unpack if we fail to load z80 state\r
      if((PmovAction&3)==2) {\r
        if(ret) z80_reset();\r
        else    z80_unpack(cpu_z80);\r
      }\r
    }\r
    if(PicoOpt&3)\r
      ScanVar(sn76496_regs,28*4,"SN76496state", PmovFile, PmovAction); // regs and other stuff\r
    if(PicoOpt&1) {\r
      ScanVar(ym2612_regs, 0x200+4, "YM2612state", PmovFile, PmovAction); // regs + addr line\r
      if((PmovAction&3)==2) YM2612PicoStateLoad(); // reload YM2612 state from it's regs\r
    }\r
  }\r
\r
  return 0;\r
}\r
\r
// ---------------------------------------------------------------------------\r
// Helper code to save/load to a file handle\r
\r
// Save or load the state from PmovFile:\r
int PmovState(int PmovAction, void *PmovFile)\r
{\r
  int minimum=0;\r
  unsigned char head[32];\r
\r
  if (PicoMCD & 1)\r
  {\r
    if (PmovAction&1) return PicoCdSaveState(PmovFile);\r
    if (PmovAction&2) return PicoCdLoadState(PmovFile);\r
  }\r
\r
  memset(head,0,sizeof(head));\r
\r
  // Find out minimal compatible version:\r
  //PicoAreaScan(PmovAction&0xc,&minimum);\r
  minimum = 0x0021;\r
\r
  memcpy(head,"Pico",4);\r
  *(unsigned int *)(head+0x8)=PicoVer;\r
  *(unsigned int *)(head+0xc)=minimum;\r
\r
  // Scan header:\r
  if (PmovAction&1) areaWrite(head,1,sizeof(head),PmovFile);\r
  if (PmovAction&2) areaRead (head,1,sizeof(head),PmovFile);\r
\r
  // Scan memory areas:\r
  PicoAreaScan(PmovAction, *(unsigned int *)(head+0x8), PmovFile);\r
\r
  return 0;\r
}\r
\r