license info added to Pico directory

[cyclone68000.git] / Pico / Area.cpp

\r
// This file is part of the PicoDrive Megadrive Emulator\r
\r
// This code is licensed under the GNU General Public License version 2.0 and the MAME License.\r
// You can choose the license that has the most advantages for you.\r
\r
// SVN repository can be found at http://code.google.com/p/cyclone68000/\r
\r
#include "PicoInt.h"\r
\r
int (*PicoAcb)(struct PicoArea *)=NULL; // Area callback for each block of memory\r
FILE *PmovFile=NULL;\r
int PmovAction=0;\r
\r
// Scan one variable and callback\r
static void ScanVar(void *data,int len,char *name)\r
{\r
  struct PicoArea pa={NULL,0,NULL};\r
  pa.data=data; pa.len=len; pa.name=name;\r
  if (PicoAcb) PicoAcb(&pa);\r
}\r
\r
#define SCAN_VAR(x,y) ScanVar(&x,sizeof(x),y);\r
#define SCANP(x)      ScanVar(&Pico.x,sizeof(Pico.x),#x);\r
\r
// Pack the cpu into a common format:\r
static int PackCpu(unsigned char *cpu)\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
#endif\r
\r
#ifdef EMU_C68K\r
  memcpy(cpu,PicoCpu.d,0x40);\r
  pc=PicoCpu.pc-PicoCpu.membase;\r
  *(unsigned char *)(cpu+0x44)=PicoCpu.ccr;\r
  *(unsigned char *)(cpu+0x45)=PicoCpu.srh;\r
  *(unsigned int  *)(cpu+0x48)=PicoCpu.osp;\r
#endif\r
\r
  *(unsigned int *)(cpu+0x40)=pc;\r
  return 0;\r
}\r
\r
static int UnpackCpu(unsigned char *cpu)\r
{\r
  unsigned int pc=0;\r
\r
  pc=*(unsigned int *)(cpu+0x40);\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
#endif\r
\r
#ifdef EMU_C68K\r
  memcpy(PicoCpu.d,cpu,0x40);\r
  PicoCpu.membase=0;\r
  PicoCpu.pc =PicoCpu.checkpc(pc); // Base pc\r
  PicoCpu.ccr=*(unsigned char *)(cpu+0x44);\r
  PicoCpu.srh=*(unsigned char *)(cpu+0x45);\r
  PicoCpu.osp=*(unsigned int  *)(cpu+0x48);\r
#endif\r
  return 0;\r
}\r
\r
// Scan the contents of the virtual machine's memory for saving or loading\r
int PicoAreaScan(int action,int *pmin)\r
{\r
  unsigned char cpu[0x60];\r
\r
  memset(&cpu,0,sizeof(cpu));\r
\r
  if (action&4)\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
    PackCpu(cpu);\r
    SekInit();\r
    PicoMemInit();\r
    SCAN_VAR(cpu,"cpu")\r
    UnpackCpu(cpu);\r
\r
    SCAN_VAR(Pico.m    ,"misc")\r
    SCAN_VAR(Pico.video,"video")\r
    SCAN_VAR(Pico.s    ,"sound")\r
\r
    Pico.m.scanline=0;\r
    if (action&2)\r
    {\r
      memset(Pico.highpal,0,sizeof(Pico.highpal));\r
      Pico.m.dirtyPal=1; // Recalculate palette\r
    }\r
  }\r
\r
  if (pmin) *pmin=0x0021;\r
\r
  return 0;\r
}\r
\r
// ---------------------------------------------------------------------------\r
// Helper code to save/load to a file handle\r
\r
// Area callback for each piece of Megadrive memory, read or write to the file:\r
static int StateAcb(struct PicoArea *pa)\r
{\r
  if (PmovFile==NULL) return 1;\r
\r
  if ((PmovAction&3)==1) fwrite(pa->data,1,pa->len,PmovFile);\r
  if ((PmovAction&3)==2) fread (pa->data,1,pa->len,PmovFile);\r
  return 0;\r
}\r
\r
// Save or load the state from PmovFile:\r
int PmovState()\r
{\r
  int minimum=0;\r
  unsigned char head[32];\r
\r
  memset(head,0,sizeof(head));\r
\r
  // Find out minial compatible version:\r
  PicoAreaScan(PmovAction&0xc,&minimum);  \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) fwrite(head,1,sizeof(head),PmovFile);\r
  if (PmovAction&2) fread (head,1,sizeof(head),PmovFile);\r
\r
  // Scan memory areas:\r
  PicoAcb=StateAcb;\r
  PicoAreaScan(PmovAction,NULL);\r
  PicoAcb=NULL;\r
  return 0;\r
}\r
\r
int PmovUpdate()\r
{\r
  int ret=0;\r
  if (PmovFile==NULL) return 1;\r
  \r
  if ((PmovAction&3)==0) return 0;\r
\r
  PicoPad[1]=0; // Make sure pad #2 is blank\r
  if (PmovAction&1) ret=fwrite(PicoPad,1,2,PmovFile);\r
  if (PmovAction&2) ret=fread (PicoPad,1,2,PmovFile);\r
\r
  if (ret!=2)\r
  {\r
    // End of file\r
    fclose(PmovFile); PmovFile=NULL;\r
    PmovAction=0;\r
  }\r
\r
  return 0;\r
}\r