| 1 | \r |
| 2 | // This file is part of the PicoDrive Megadrive Emulator\r |
| 3 | \r |
| 4 | // Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\r |
| 5 | \r |
| 6 | // This code is licensed under the GNU General Public License version 2.0 and the MAME License.\r |
| 7 | // You can choose the license that has the most advantages for you.\r |
| 8 | \r |
| 9 | // SVN repository can be found at http://code.google.com/p/cyclone68000/\r |
| 10 | \r |
| 11 | #include "PicoInt.h"\r |
| 12 | \r |
| 13 | char PicoStatus[128]=""; // 68000 state for debug\r |
| 14 | \r |
| 15 | #ifdef EMU_C68K\r |
| 16 | // ---------------------- Cyclone 68000 ----------------------\r |
| 17 | \r |
| 18 | struct Cyclone PicoCpu;\r |
| 19 | \r |
| 20 | int SekInit()\r |
| 21 | {\r |
| 22 | memset(&PicoCpu,0,sizeof(PicoCpu));\r |
| 23 | return 0;\r |
| 24 | }\r |
| 25 | \r |
| 26 | // Reset the 68000:\r |
| 27 | int SekReset()\r |
| 28 | {\r |
| 29 | if (Pico.rom==NULL) return 1;\r |
| 30 | \r |
| 31 | PicoCpu.srh =0x27; // Supervisor mode\r |
| 32 | PicoCpu.a[7]=PicoCpu.read32(0); // Stack Pointer\r |
| 33 | PicoCpu.membase=0;\r |
| 34 | PicoCpu.pc=PicoCpu.checkpc(PicoCpu.read32(4)); // Program Counter\r |
| 35 | \r |
| 36 | return 0;\r |
| 37 | }\r |
| 38 | \r |
| 39 | \r |
| 40 | // Run the 68000 for 'cyc' number of cycles and return the number of cycles actually executed\r |
| 41 | static inline int DoRun(int cyc)\r |
| 42 | {\r |
| 43 | PicoCpu.cycles=cyc;\r |
| 44 | CycloneRun(&PicoCpu);\r |
| 45 | return cyc-PicoCpu.cycles;\r |
| 46 | }\r |
| 47 | \r |
| 48 | int SekInterrupt(int irq)\r |
| 49 | {\r |
| 50 | PicoCpu.irq=(unsigned char)irq;\r |
| 51 | return 0;\r |
| 52 | }\r |
| 53 | \r |
| 54 | int SekPc() { return PicoCpu.pc-PicoCpu.membase; }\r |
| 55 | \r |
| 56 | void SekState(unsigned char *data)\r |
| 57 | {\r |
| 58 | memcpy(data,PicoCpu.d,0x44);\r |
| 59 | }\r |
| 60 | \r |
| 61 | #endif\r |
| 62 | \r |
| 63 | #ifdef EMU_A68K\r |
| 64 | // ---------------------- A68K ----------------------\r |
| 65 | \r |
| 66 | extern "C" void __cdecl M68000_RUN();\r |
| 67 | extern "C" void __cdecl M68000_RESET();\r |
| 68 | extern "C" int m68k_ICount=0;\r |
| 69 | extern "C" unsigned int mem_amask=0xffffff; // 24-bit bus\r |
| 70 | extern "C" unsigned int mame_debug=0,cur_mrhard=0,m68k_illegal_opcode=0,illegal_op=0,illegal_pc=0,opcode_entry=0; // filler\r |
| 71 | \r |
| 72 | static int IrqCallback(int) { return -1; }\r |
| 73 | static int DoReset() { return 0; }\r |
| 74 | static int (*ResetCallback)()=DoReset;\r |
| 75 | \r |
| 76 | int SekInit()\r |
| 77 | {\r |
| 78 | memset(&M68000_regs,0,sizeof(M68000_regs));\r |
| 79 | M68000_regs.IrqCallback=IrqCallback;\r |
| 80 | M68000_regs.pResetCallback=ResetCallback;\r |
| 81 | M68000_RESET(); // Init cpu emulator\r |
| 82 | return 0;\r |
| 83 | }\r |
| 84 | \r |
| 85 | int SekReset()\r |
| 86 | {\r |
| 87 | // Reset CPU: fetch SP and PC\r |
| 88 | M68000_regs.srh=0x27; // Supervisor mode\r |
| 89 | M68000_regs.a[7]=PicoRead32(0);\r |
| 90 | M68000_regs.pc =PicoRead32(4);\r |
| 91 | PicoInitPc(M68000_regs.pc);\r |
| 92 | \r |
| 93 | return 0;\r |
| 94 | }\r |
| 95 | \r |
| 96 | static inline int DoRun(int cyc)\r |
| 97 | {\r |
| 98 | m68k_ICount=cyc;\r |
| 99 | M68000_RUN();\r |
| 100 | return cyc-m68k_ICount;\r |
| 101 | }\r |
| 102 | \r |
| 103 | int SekInterrupt(int irq)\r |
| 104 | {\r |
| 105 | M68000_regs.irq=irq; // raise irq (gets lowered after taken)\r |
| 106 | return 0;\r |
| 107 | }\r |
| 108 | \r |
| 109 | int SekPc() { return M68000_regs.pc; }\r |
| 110 | \r |
| 111 | void SekState(unsigned char *data)\r |
| 112 | {\r |
| 113 | memcpy(data, M68000_regs.d, 0x40);\r |
| 114 | memcpy(data+0x40,&M68000_regs.pc,0x04);\r |
| 115 | }\r |
| 116 | \r |
| 117 | #endif\r |
| 118 | \r |
| 119 | #ifdef EMU_NULL\r |
| 120 | // -----------------------------------------------------------\r |
| 121 | int SekInit() { return 0; }\r |
| 122 | int SekReset() { return 0; }\r |
| 123 | static inline int DoRun(int cyc) { return cyc; }\r |
| 124 | int SekInterrupt(int) { return 0; }\r |
| 125 | \r |
| 126 | int SekPc()\r |
| 127 | {\r |
| 128 | return 0;\r |
| 129 | }\r |
| 130 | \r |
| 131 | void SekState(unsigned char *) { }\r |
| 132 | \r |
| 133 | #endif\r |
| 134 | \r |
| 135 | int SekRun(int cyc)\r |
| 136 | {\r |
| 137 | int did=0;\r |
| 138 | \r |
| 139 | did=DoRun(cyc);\r |
| 140 | \r |
| 141 | return did;\r |
| 142 | }\r |