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1 | // This is part of Pico Library\r |
2 | \r |
3 | // (c) Copyright 2004 Dave, All rights reserved.\r |
4 | // (c) Copyright 2006 notaz, All rights reserved.\r |
5 | // Free for non-commercial use.\r |
6 | \r |
7 | // For commercial use, separate licencing terms must be obtained.\r |
8 | \r |
9 | \r |
10 | #include "PicoInt.h"\r |
11 | \r |
12 | \r |
13 | int SekCycleCnt=0; // cycles done in this frame\r |
14 | int SekCycleAim=0; // cycle aim\r |
15 | unsigned int SekCycleCntT=0;\r |
16 | \r |
17 | #ifdef EMU_C68K\r |
18 | // ---------------------- Cyclone 68000 ----------------------\r |
19 | struct Cyclone PicoCpu;\r |
20 | #endif\r |
21 | \r |
22 | #ifdef EMU_M68K\r |
23 | // ---------------------- MUSASHI 68000 ----------------------\r |
24 | m68ki_cpu_core PicoM68kCPU; // MD's CPU\r |
25 | #endif\r |
26 | \r |
27 | #ifdef EMU_A68K\r |
28 | // ---------------------- A68K ----------------------\r |
29 | \r |
30 | void __cdecl M68000_RESET();\r |
31 | int m68k_ICount=0;\r |
32 | unsigned int mem_amask=0xffffff; // 24-bit bus\r |
33 | unsigned int mame_debug=0,cur_mrhard=0,m68k_illegal_opcode=0,illegal_op=0,illegal_pc=0,opcode_entry=0; // filler\r |
34 | \r |
35 | static int IrqCallback(int i) { i; return -1; }\r |
36 | static int DoReset() { return 0; }\r |
37 | static int (*ResetCallback)()=DoReset;\r |
38 | \r |
39 | #pragma warning (disable:4152)\r |
40 | #endif\r |
41 | \r |
42 | \r |
43 | \r |
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44 | #ifdef EMU_C68K\r |
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45 | // interrupt acknowledgment\r |
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46 | static int SekIntAck(int level)\r |
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47 | {\r |
48 | // try to emulate VDP's reaction to 68000 int ack\r |
49 | if (level == 4) Pico.video.pending_ints = 0;\r |
50 | else if(level == 6) Pico.video.pending_ints &= ~0x20;\r |
51 | PicoCpu.irq = 0;\r |
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52 | return CYCLONE_INT_ACK_AUTOVECTOR;\r |
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53 | }\r |
54 | \r |
55 | static void SekResetAck()\r |
56 | {\r |
57 | #if defined(__DEBUG_PRINT) || defined(WIN32)\r |
58 | dprintf("Reset encountered @ %06x", SekPc);\r |
59 | #endif\r |
60 | }\r |
61 | \r |
62 | static int SekUnrecognizedOpcode()\r |
63 | {\r |
64 | unsigned int pc, op;\r |
65 | pc = SekPc;\r |
66 | op = PicoCpu.read16(pc);\r |
67 | #if defined(__DEBUG_PRINT) || defined(WIN32)\r |
68 | dprintf("Unrecognized Opcode %04x @ %06x", op, pc);\r |
69 | #endif\r |
70 | // see if we are not executing trash\r |
71 | if (pc < 0x200 || (pc > Pico.romsize+4 && (pc&0xe00000)!=0xe00000)) {\r |
72 | PicoCpu.cycles = 0;\r |
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73 | PicoCpu.state_flags |= 1;\r |
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74 | return 1;\r |
75 | }\r |
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76 | #ifdef EMU_M68K // debugging cyclone\r |
77 | {\r |
78 | extern int have_illegal;\r |
79 | have_illegal = 1;\r |
80 | }\r |
81 | #endif\r |
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82 | //exit(1);\r |
83 | return 0;\r |
84 | }\r |
85 | #endif\r |
86 | \r |
87 | \r |
88 | #ifdef EMU_M68K\r |
89 | static int SekIntAckM68K(int level)\r |
90 | {\r |
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91 | if (level == 4) { Pico.video.pending_ints = 0; dprintf("hack: [%i|%i]", Pico.m.scanline, SekCyclesDone()); }\r |
92 | else if(level == 6) { Pico.video.pending_ints &= ~0x20; dprintf("vack: [%i|%i]", Pico.m.scanline, SekCyclesDone()); }\r |
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93 | CPU_INT_LEVEL = 0;\r |
94 | return M68K_INT_ACK_AUTOVECTOR;\r |
95 | }\r |
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96 | \r |
97 | static int SekTasCallback(void)\r |
98 | {\r |
99 | return 0; // no writeback\r |
100 | }\r |
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101 | #endif\r |
102 | \r |
103 | \r |
104 | \r |
105 | int SekInit()\r |
106 | {\r |
107 | #ifdef EMU_C68K\r |
108 | CycloneInit();\r |
109 | memset(&PicoCpu,0,sizeof(PicoCpu));\r |
110 | PicoCpu.IrqCallback=SekIntAck;\r |
111 | PicoCpu.ResetCallback=SekResetAck;\r |
112 | PicoCpu.UnrecognizedCallback=SekUnrecognizedOpcode;\r |
113 | #endif\r |
114 | #ifdef EMU_A68K\r |
115 | memset(&M68000_regs,0,sizeof(M68000_regs));\r |
116 | M68000_regs.IrqCallback=IrqCallback;\r |
117 | M68000_regs.pResetCallback=ResetCallback;\r |
118 | M68000_RESET(); // Init cpu emulator\r |
119 | #endif\r |
120 | #ifdef EMU_M68K\r |
121 | {\r |
122 | void *oldcontext = m68ki_cpu_p;\r |
123 | m68k_set_context(&PicoM68kCPU);\r |
124 | m68k_set_cpu_type(M68K_CPU_TYPE_68000);\r |
125 | m68k_init();\r |
126 | m68k_set_int_ack_callback(SekIntAckM68K);\r |
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127 | m68k_set_tas_instr_callback(SekTasCallback);\r |
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128 | m68k_pulse_reset(); // Init cpu emulator\r |
129 | m68k_set_context(oldcontext);\r |
130 | }\r |
131 | #endif\r |
132 | \r |
133 | return 0;\r |
134 | }\r |
135 | \r |
136 | // Reset the 68000:\r |
137 | int SekReset()\r |
138 | {\r |
139 | if (Pico.rom==NULL) return 1;\r |
140 | \r |
141 | #ifdef EMU_C68K\r |
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142 | PicoCpu.state_flags=0;\r |
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143 | PicoCpu.osp=0;\r |
144 | PicoCpu.srh =0x27; // Supervisor mode\r |
145 | PicoCpu.flags=4; // Z set\r |
146 | PicoCpu.irq=0;\r |
147 | PicoCpu.a[7]=PicoCpu.read32(0); // Stack Pointer\r |
148 | PicoCpu.membase=0;\r |
149 | PicoCpu.pc=PicoCpu.checkpc(PicoCpu.read32(4)); // Program Counter\r |
150 | #endif\r |
151 | #ifdef EMU_A68K\r |
152 | // Reset CPU: fetch SP and PC\r |
153 | M68000_regs.srh=0x27; // Supervisor mode\r |
154 | M68000_regs.a[7]=PicoRead32(0);\r |
155 | M68000_regs.pc =PicoRead32(4);\r |
156 | PicoInitPc(M68000_regs.pc);\r |
157 | #endif\r |
158 | #ifdef EMU_M68K\r |
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159 | m68k_set_context(&PicoM68kCPU); // if we ever reset m68k, we always need it's context to be set\r |
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160 | m68ki_cpu.sp[0]=0;\r |
161 | m68k_set_irq(0);\r |
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162 | m68k_pulse_reset();\r |
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163 | #endif\r |
164 | \r |
165 | return 0;\r |
166 | }\r |
167 | \r |
168 | \r |
169 | int SekInterrupt(int irq)\r |
170 | {\r |
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171 | #if defined(EMU_C68K) && defined(EMU_M68K)\r |
172 | {\r |
173 | extern unsigned int dbg_irq_level;\r |
174 | dbg_irq_level=irq;\r |
175 | return 0;\r |
176 | }\r |
177 | #endif\r |
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178 | #ifdef EMU_C68K\r |
179 | PicoCpu.irq=irq;\r |
180 | #endif\r |
181 | #ifdef EMU_A68K\r |
182 | M68000_regs.irq=irq; // raise irq (gets lowered after taken)\r |
183 | #endif\r |
184 | #ifdef EMU_M68K\r |
185 | {\r |
186 | void *oldcontext = m68ki_cpu_p;\r |
187 | m68k_set_context(&PicoM68kCPU);\r |
188 | m68k_set_irq(irq); // raise irq (gets lowered after taken or must be done in ack)\r |
189 | m68k_set_context(oldcontext);\r |
190 | }\r |
191 | #endif\r |
192 | return 0;\r |
193 | }\r |
194 | \r |
195 | //int SekPc() { return PicoCpu.pc-PicoCpu.membase; }\r |
196 | //int SekPc() { return M68000_regs.pc; }\r |
197 | //int SekPc() { return m68k_get_reg(NULL, M68K_REG_PC); }\r |
198 | \r |
199 | void SekState(unsigned char *data)\r |
200 | {\r |
201 | #ifdef EMU_C68K\r |
202 | memcpy(data,PicoCpu.d,0x44);\r |
203 | #elif defined(EMU_A68K)\r |
204 | memcpy(data, M68000_regs.d, 0x40);\r |
205 | memcpy(data+0x40,&M68000_regs.pc,0x04);\r |
206 | #elif defined(EMU_M68K)\r |
207 | memcpy(data, PicoM68kCPU.dar,0x40);\r |
208 | memcpy(data+0x40,&PicoM68kCPU.pc, 0x04);\r |
209 | #endif\r |
210 | }\r |
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211 | \r |
212 | void SekSetRealTAS(int use_real)\r |
213 | {\r |
214 | #ifdef EMU_C68K\r |
215 | CycloneSetRealTAS(use_real);\r |
216 | #endif\r |
217 | }\r |
218 | \r |