cc68a136 |
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 |
70357ce5 |
17 | \r |
18 | /* context */\r |
19 | // Cyclone 68000\r |
cc68a136 |
20 | #ifdef EMU_C68K\r |
cc68a136 |
21 | struct Cyclone PicoCpu;\r |
22 | #endif\r |
70357ce5 |
23 | // MUSASHI 68000\r |
cc68a136 |
24 | #ifdef EMU_M68K\r |
70357ce5 |
25 | m68ki_cpu_core PicoM68kCPU;\r |
cc68a136 |
26 | #endif\r |
70357ce5 |
27 | // FAME 68000\r |
28 | #ifdef EMU_F68K\r |
29 | M68K_CONTEXT PicoCpuM68k;\r |
cc68a136 |
30 | #endif\r |
31 | \r |
32 | \r |
70357ce5 |
33 | /* callbacks */\r |
cc68a136 |
34 | #ifdef EMU_C68K\r |
b837b69b |
35 | // interrupt acknowledgment\r |
0af33fe0 |
36 | static int SekIntAck(int level)\r |
cc68a136 |
37 | {\r |
38 | // try to emulate VDP's reaction to 68000 int ack\r |
69996cb7 |
39 | if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }\r |
40 | else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }\r |
cc68a136 |
41 | PicoCpu.irq = 0;\r |
0af33fe0 |
42 | return CYCLONE_INT_ACK_AUTOVECTOR;\r |
cc68a136 |
43 | }\r |
44 | \r |
69996cb7 |
45 | static void SekResetAck(void)\r |
cc68a136 |
46 | {\r |
69996cb7 |
47 | elprintf(EL_ANOMALY, "Reset encountered @ %06x", SekPc);\r |
cc68a136 |
48 | }\r |
49 | \r |
50 | static int SekUnrecognizedOpcode()\r |
51 | {\r |
52 | unsigned int pc, op;\r |
53 | pc = SekPc;\r |
54 | op = PicoCpu.read16(pc);\r |
69996cb7 |
55 | elprintf(EL_ANOMALY, "Unrecognized Opcode %04x @ %06x", op, pc);\r |
cc68a136 |
56 | // see if we are not executing trash\r |
57 | if (pc < 0x200 || (pc > Pico.romsize+4 && (pc&0xe00000)!=0xe00000)) {\r |
58 | PicoCpu.cycles = 0;\r |
0af33fe0 |
59 | PicoCpu.state_flags |= 1;\r |
cc68a136 |
60 | return 1;\r |
61 | }\r |
2d0b15bb |
62 | #ifdef EMU_M68K // debugging cyclone\r |
63 | {\r |
64 | extern int have_illegal;\r |
65 | have_illegal = 1;\r |
66 | }\r |
67 | #endif\r |
cc68a136 |
68 | return 0;\r |
69 | }\r |
70 | #endif\r |
71 | \r |
72 | \r |
73 | #ifdef EMU_M68K\r |
74 | static int SekIntAckM68K(int level)\r |
75 | {\r |
69996cb7 |
76 | if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }\r |
77 | else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }\r |
cc68a136 |
78 | CPU_INT_LEVEL = 0;\r |
79 | return M68K_INT_ACK_AUTOVECTOR;\r |
80 | }\r |
0af33fe0 |
81 | \r |
82 | static int SekTasCallback(void)\r |
83 | {\r |
84 | return 0; // no writeback\r |
85 | }\r |
cc68a136 |
86 | #endif\r |
87 | \r |
88 | \r |
70357ce5 |
89 | #ifdef EMU_F68K\r |
90 | static void setup_fame_fetchmap(void)\r |
91 | {\r |
92 | int i;\r |
93 | \r |
94 | // be default, point everything to fitst 64k of ROM\r |
95 | for (i = 0; i < M68K_FETCHBANK1; i++)\r |
96 | PicoCpuM68k.Fetch[i] = (unsigned int)Pico.rom - (i<<(24-FAMEC_FETCHBITS));\r |
97 | // now real ROM\r |
98 | for (i = 0; i < M68K_FETCHBANK1 && (i<<(24-FAMEC_FETCHBITS)) < Pico.romsize; i++)\r |
99 | PicoCpuM68k.Fetch[i] = (unsigned int)Pico.rom;\r |
100 | elprintf(EL_ANOMALY, "ROM end @ #%i %06x", i, (i<<(24-FAMEC_FETCHBITS)));\r |
101 | // .. and RAM (TODO)\r |
102 | for (i = M68K_FETCHBANK1*14/16; i < M68K_FETCHBANK1; i++)\r |
103 | PicoCpuM68k.Fetch[i] = (unsigned int)Pico.ram - (i<<(24-FAMEC_FETCHBITS));\r |
104 | \r |
105 | elprintf(EL_ANOMALY, "rom = %p, ram = %p", Pico.rom, Pico.ram);\r |
106 | for (i = 0; i < M68K_FETCHBANK1; i++)\r |
107 | elprintf(EL_ANOMALY, "Fetch[%i] = %p", i, PicoCpuM68k.Fetch[i]);\r |
108 | }\r |
109 | \r |
110 | void SekIntAckF68K(unsigned level)\r |
111 | {\r |
112 | if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%i]", SekPc, SekCycleCnt); }\r |
113 | else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%i]", SekPc, SekCycleCnt); }\r |
114 | PicoCpuM68k.interrupts[0] = 0;\r |
115 | }\r |
116 | #endif\r |
117 | \r |
cc68a136 |
118 | \r |
eff55556 |
119 | PICO_INTERNAL int SekInit()\r |
cc68a136 |
120 | {\r |
121 | #ifdef EMU_C68K\r |
122 | CycloneInit();\r |
123 | memset(&PicoCpu,0,sizeof(PicoCpu));\r |
124 | PicoCpu.IrqCallback=SekIntAck;\r |
125 | PicoCpu.ResetCallback=SekResetAck;\r |
126 | PicoCpu.UnrecognizedCallback=SekUnrecognizedOpcode;\r |
127 | #endif\r |
cc68a136 |
128 | #ifdef EMU_M68K\r |
129 | {\r |
130 | void *oldcontext = m68ki_cpu_p;\r |
131 | m68k_set_context(&PicoM68kCPU);\r |
132 | m68k_set_cpu_type(M68K_CPU_TYPE_68000);\r |
133 | m68k_init();\r |
134 | m68k_set_int_ack_callback(SekIntAckM68K);\r |
0af33fe0 |
135 | m68k_set_tas_instr_callback(SekTasCallback);\r |
cc68a136 |
136 | m68k_pulse_reset(); // Init cpu emulator\r |
137 | m68k_set_context(oldcontext);\r |
138 | }\r |
139 | #endif\r |
70357ce5 |
140 | #ifdef EMU_F68K\r |
141 | {\r |
142 | void *oldcontext = g_m68kcontext;\r |
143 | g_m68kcontext = &PicoCpuM68k;\r |
144 | memset(&PicoCpuM68k, 0, sizeof(PicoCpuM68k));\r |
145 | m68k_init();\r |
146 | PicoCpuM68k.iack_handler = SekIntAckF68K;\r |
147 | g_m68kcontext = oldcontext;\r |
148 | }\r |
149 | #endif\r |
cc68a136 |
150 | \r |
151 | return 0;\r |
152 | }\r |
153 | \r |
70357ce5 |
154 | \r |
cc68a136 |
155 | // Reset the 68000:\r |
eff55556 |
156 | PICO_INTERNAL int SekReset()\r |
cc68a136 |
157 | {\r |
158 | if (Pico.rom==NULL) return 1;\r |
159 | \r |
160 | #ifdef EMU_C68K\r |
0af33fe0 |
161 | PicoCpu.state_flags=0;\r |
cc68a136 |
162 | PicoCpu.osp=0;\r |
163 | PicoCpu.srh =0x27; // Supervisor mode\r |
164 | PicoCpu.flags=4; // Z set\r |
165 | PicoCpu.irq=0;\r |
166 | PicoCpu.a[7]=PicoCpu.read32(0); // Stack Pointer\r |
167 | PicoCpu.membase=0;\r |
168 | PicoCpu.pc=PicoCpu.checkpc(PicoCpu.read32(4)); // Program Counter\r |
169 | #endif\r |
cc68a136 |
170 | #ifdef EMU_M68K\r |
b837b69b |
171 | m68k_set_context(&PicoM68kCPU); // if we ever reset m68k, we always need it's context to be set\r |
2d0b15bb |
172 | m68ki_cpu.sp[0]=0;\r |
173 | m68k_set_irq(0);\r |
b837b69b |
174 | m68k_pulse_reset();\r |
cc68a136 |
175 | #endif\r |
70357ce5 |
176 | #ifdef EMU_F68K\r |
177 | {\r |
178 | unsigned ret;\r |
179 | g_m68kcontext = &PicoCpuM68k;\r |
180 | setup_fame_fetchmap();\r |
181 | ret = m68k_reset();\r |
182 | /*if (ret)*/ elprintf(EL_ANOMALY, "m68k_reset returned %u", ret);\r |
183 | }\r |
184 | #endif\r |
cc68a136 |
185 | \r |
186 | return 0;\r |
187 | }\r |
188 | \r |
189 | \r |
eff55556 |
190 | PICO_INTERNAL int SekInterrupt(int irq)\r |
cc68a136 |
191 | {\r |
0af33fe0 |
192 | #if defined(EMU_C68K) && defined(EMU_M68K)\r |
193 | {\r |
194 | extern unsigned int dbg_irq_level;\r |
195 | dbg_irq_level=irq;\r |
196 | return 0;\r |
197 | }\r |
198 | #endif\r |
cc68a136 |
199 | #ifdef EMU_C68K\r |
200 | PicoCpu.irq=irq;\r |
201 | #endif\r |
cc68a136 |
202 | #ifdef EMU_M68K\r |
203 | {\r |
204 | void *oldcontext = m68ki_cpu_p;\r |
205 | m68k_set_context(&PicoM68kCPU);\r |
206 | m68k_set_irq(irq); // raise irq (gets lowered after taken or must be done in ack)\r |
207 | m68k_set_context(oldcontext);\r |
208 | }\r |
209 | #endif\r |
70357ce5 |
210 | #ifdef EMU_F68K\r |
211 | PicoCpuM68k.interrupts[0]=irq;\r |
212 | #endif\r |
213 | \r |
cc68a136 |
214 | return 0;\r |
215 | }\r |
216 | \r |
eff55556 |
217 | PICO_INTERNAL void SekState(unsigned char *data)\r |
cc68a136 |
218 | {\r |
219 | #ifdef EMU_C68K\r |
220 | memcpy(data,PicoCpu.d,0x44);\r |
cc68a136 |
221 | #elif defined(EMU_M68K)\r |
70357ce5 |
222 | memcpy(data, PicoM68kCPU.dar, 0x40);\r |
223 | *(int *)(data+0x40) = PicoM68kCPU.pc;\r |
224 | #elif defined(EMU_F68K)\r |
225 | memcpy(data, PicoCpuM68k.dreg, 0x40);\r |
226 | *(int *)(data+0x40) = PicoCpuM68k.pc;\r |
cc68a136 |
227 | #endif\r |
228 | }\r |
2433f409 |
229 | \r |
eff55556 |
230 | PICO_INTERNAL void SekSetRealTAS(int use_real)\r |
2433f409 |
231 | {\r |
232 | #ifdef EMU_C68K\r |
233 | CycloneSetRealTAS(use_real);\r |
234 | #endif\r |
70357ce5 |
235 | #ifdef EMU_F68K\r |
236 | // TODO\r |
237 | #endif\r |
2433f409 |
238 | }\r |
239 | \r |