--- /dev/null
+\r
+#include "PicoInt.h"\r
+\r
+typedef unsigned char u8;\r
+typedef unsigned short u16;\r
+typedef unsigned int u32;\r
+\r
+static int PicoMemBase(u32 pc)\r
+{\r
+ int membase=0;\r
+\r
+ if (pc<Pico.romsize)\r
+ {\r
+ membase=(int)Pico.rom; // Program Counter in Rom\r
+ }\r
+ else if ((pc&0xe00000)==0xe00000)\r
+ {\r
+ membase=(int)Pico.ram-(pc&0xff0000); // Program Counter in Ram\r
+ }\r
+ else\r
+ {\r
+ // Error - Program Counter is invalid\r
+ membase=(int)Pico.rom;\r
+ }\r
+\r
+ return membase;\r
+}\r
+\r
+#ifdef EMU_A68K\r
+extern "C" u8 *OP_ROM=NULL,*OP_RAM=NULL;\r
+\r
+static void CPU_CALL PicoCheckPc(u32 pc)\r
+{\r
+ OP_ROM=(u8 *)PicoMemBase(pc);\r
+\r
+ // don't bother calling us back unless it's outside the 64k segment\r
+ M68000_regs.AsmBank=(pc>>16);\r
+}\r
+#endif\r
+\r
+#ifdef EMU_C68K\r
+static u32 PicoCheckPc(u32 pc)\r
+{\r
+ pc-=PicoCpu.membase; // Get real pc\r
+ pc&=0xffffff;\r
+\r
+ PicoCpu.membase=PicoMemBase(pc);\r
+\r
+ return PicoCpu.membase+pc;\r
+}\r
+#endif\r
+\r
+#ifdef EMU_NULL\r
+static u32 PicoCheckPc(u32) { return 0; }\r
+#endif\r
+\r
+\r
+int PicoInitPc(u32 pc)\r
+{\r
+ PicoCheckPc(pc);\r
+ return 0;\r
+}\r
+\r
+// -----------------------------------------------------------------\r
+static int PadRead(int i)\r
+{\r
+ int pad=0,value=0;\r
+ pad=~PicoPad[i]; // Get inverse of pad\r
+\r
+ if (Pico.m.padSelect[i]) value=0x40|(pad&0x3f); // 01CB RLDU\r
+ else value=((pad&0xc0)>>2)|(pad&3); // 00SA 00DU\r
+\r
+ return (value<<8)|value; // Mirror bytes\r
+}\r
+\r
+static u32 OtherRead16(u32 a)\r
+{\r
+ u32 d=0;\r
+\r
+ if ((a&0xffe000)==0xa00000)\r
+ {\r
+ // Z80 ram\r
+ d=*(u16 *)(Pico.zram+(a&0x1fff));\r
+\r
+ if (Pico.m.rotate&2) { d=(Pico.m.rotate>>2)&0xff; d|=d<<8; } // Fake z80\r
+ Pico.m.rotate++;\r
+\r
+ goto end;\r
+ }\r
+\r
+ if ((a&0xffe000)==0xa00000)\r
+ {\r
+ // Fake Z80 ram\r
+ d=((Pico.m.rotate++)>>2)&0xff; d|=d<<8;\r
+ goto end;\r
+ }\r
+ \r
+ if (a==0xa04000) { d=Pico.m.rotate&3; Pico.m.rotate++; goto end; } // Fudge\r
+ if (a==0xa10000) { d=Pico.m.hardware; goto end; } // Hardware value\r
+ if (a==0xa10002) { d=PadRead(0); goto end; }\r
+ if (a==0xa10004) { d=PadRead(1); goto end; }\r
+ if (a==0xa11100) { d=((Pico.m.rotate++)&4)<<6; goto end; } // Fudge z80 reset\r
+\r
+ if ((a&0xffffe0)==0xc00000) { d=PicoVideoRead(a); goto end; }\r
+\r
+end:\r
+ return d;\r
+}\r
+\r
+static void OtherWrite8(u32 a,u32 d)\r
+{\r
+ if ((a&0xffe000)==0xa00000) { Pico.zram[(a^1)&0x1fff]=(u8)d; return; } // Z80 ram\r
+ if ((a&0xfffffc)==0xa04000) { PsndFm(a,d); return; } // FM Sound\r
+\r
+ if (a==0xa11100) { Pico.m.z80Run=(u8)(d^1); return; }\r
+ if (a==0xa10003) { Pico.m.padSelect[0]=(u8)((d>>6)&1); return; } // Joypad 1 select\r
+ if (a==0xa10005) { Pico.m.padSelect[1]=(u8)((d>>6)&1); return; } // Joypad 2 select\r
+\r
+ if ((a&0xffffe0)==0xc00000) { PicoVideoWrite(a,d|(d<<8)); return; } // Byte access gets mirrored\r
+}\r
+\r
+static void OtherWrite16(u32 a,u32 d)\r
+{\r
+ if ((a&0xffffe0)==0xc00000) { PicoVideoWrite(a,d); return; }\r
+ if ((a&0xffe000)==0xa00000) { *(u16 *)(Pico.zram+(a&0x1ffe))=(u16)d; return; } // Z80 ram\r
+\r
+ OtherWrite8(a, d>>8);\r
+ OtherWrite8(a+1,d&0xff);\r
+}\r
+\r
+// -----------------------------------------------------------------\r
+// Read Rom and read Ram\r
+\r
+static u8 CPU_CALL PicoRead8(u32 a)\r
+{\r
+ u32 d=0;\r
+ a&=0xffffff;\r
+\r
+ if (a<Pico.romsize) return *(u8 *)(Pico.rom+(a^1)); // Rom\r
+ if ((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram\r
+\r
+ d=OtherRead16(a&~1); if ((a&1)==0) d>>=8;\r
+ return (u8)d;\r
+}\r
+\r
+u16 CPU_CALL PicoRead16(u32 a)\r
+{\r
+ a&=0xfffffe;\r
+\r
+ if (a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+a); return pm[0]; } // Rom\r
+ if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xffff)); return pm[0]; } // Ram\r
+\r
+ return (u16)OtherRead16(a);\r
+}\r
+\r
+u32 CPU_CALL PicoRead32(u32 a)\r
+{\r
+ a&=0xfffffe;\r
+\r
+ if (a<Pico.romsize) { u16 *pm=(u16 *)(Pico.rom+a); return (pm[0]<<16)|pm[1]; } // Rom\r
+ if ((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xffff)); return (pm[0]<<16)|pm[1]; } // Ram\r
+\r
+ return (OtherRead16(a)<<16)|OtherRead16(a+2);\r
+}\r
+\r
+// -----------------------------------------------------------------\r
+// Write Ram\r
+\r
+static void CPU_CALL PicoWrite8(u32 a,u8 d)\r
+{\r
+ if ((a&0xe00000)==0xe00000) { u8 *pm=(u8 *)(Pico.ram+((a^1)&0xffff)); pm[0]=d; return; } // Ram\r
+\r
+ a&=0xffffff;\r
+ OtherWrite8(a,d);\r
+}\r
+\r
+static void CPU_CALL PicoWrite16(u32 a,u16 d)\r
+{\r
+ if ((a&0xe00000)==0xe00000) { *(u16 *)(Pico.ram+(a&0xfffe))=d; return; } // Ram\r
+\r
+ a&=0xfffffe;\r
+ OtherWrite16(a,d);\r
+}\r
+\r
+static void CPU_CALL PicoWrite32(u32 a,u32 d)\r
+{\r
+ if ((a&0xe00000)==0xe00000)\r
+ {\r
+ // Ram:\r
+ u16 *pm=(u16 *)(Pico.ram+(a&0xfffe));\r
+ pm[0]=(u16)(d>>16); pm[1]=(u16)d;\r
+ return;\r
+ }\r
+\r
+ a&=0xfffffe;\r
+ OtherWrite16(a, (u16)(d>>16));\r
+ OtherWrite16(a+2,(u16)d);\r
+}\r
+\r
+\r
+// -----------------------------------------------------------------\r
+int PicoMemInit()\r
+{\r
+#ifdef EMU_C68K\r
+ // Setup memory callbacks:\r
+ PicoCpu.checkpc=PicoCheckPc;\r
+ PicoCpu.fetch8 =PicoCpu.read8 =PicoRead8;\r
+ PicoCpu.fetch16=PicoCpu.read16=PicoRead16;\r
+ PicoCpu.fetch32=PicoCpu.read32=PicoRead32;\r
+ PicoCpu.write8 =PicoWrite8;\r
+ PicoCpu.write16=PicoWrite16;\r
+ PicoCpu.write32=PicoWrite32;\r
+#endif\r
+ return 0;\r
+}\r
+\r
+#ifdef EMU_A68K\r
+struct A68KInter\r
+{\r
+ u32 unknown;\r
+ u8 (__fastcall *Read8) (u32 a);\r
+ u16 (__fastcall *Read16)(u32 a);\r
+ u32 (__fastcall *Read32)(u32 a);\r
+ void (__fastcall *Write8) (u32 a,u8 d);\r
+ void (__fastcall *Write16) (u32 a,u16 d);\r
+ void (__fastcall *Write32) (u32 a,u32 d);\r
+ void (__fastcall *ChangePc)(u32 a);\r
+ u8 (__fastcall *PcRel8) (u32 a);\r
+ u16 (__fastcall *PcRel16)(u32 a);\r
+ u32 (__fastcall *PcRel32)(u32 a);\r
+ u16 (__fastcall *Dir16)(u32 a);\r
+ u32 (__fastcall *Dir32)(u32 a);\r
+};\r
+\r
+extern "C" struct A68KInter a68k_memory_intf=\r
+{\r
+ 0,\r
+ PicoRead8,\r
+ PicoRead16,\r
+ PicoRead32,\r
+ PicoWrite8,\r
+ PicoWrite16,\r
+ PicoWrite32,\r
+ PicoCheckPc,\r
+ PicoRead8,\r
+ PicoRead16,\r
+ PicoRead32,\r
+ PicoRead16, // unused\r
+ PicoRead32, // unused\r
+};\r
+#endif\r
notaz.gp2x.de / cyclone68000.git / blobdiff