initial libretro port
[picodrive.git] / pico / pico.c
CommitLineData
cff531af 1/*\r
2 * PicoDrive\r
3 * (c) Copyright Dave, 2004\r
4 * (C) notaz, 2006-2010\r
5 *\r
6 * This work is licensed under the terms of MAME license.\r
7 * See COPYING file in the top-level directory.\r
8 */\r
cc68a136 9\r
efcba75f 10#include "pico_int.h"\r
cc68a136 11#include "sound/ym2612.h"\r
12\r
cc68a136 13struct Pico Pico;\r
5e128c6d 14int PicoOpt; \r
15int PicoSkipFrame; // skip rendering frame?\r
2b02d6e5 16int PicoPad[2]; // Joypads, format is MXYZ SACB RLDU\r
5f9a0d16 17int PicoPadInt[2]; // internal copy\r
5e128c6d 18int PicoAHW; // active addon hardware: PAHW_*\r
19int PicoRegionOverride; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe\r
20int PicoAutoRgnOrder;\r
21\r
22struct PicoSRAM SRam;\r
23int emustatus; // rapid_ym2612, multi_ym_updates\r
24int scanlines_total;\r
602133e1 25\r
f3a57b2d 26int p32x_msh2_multiplier = MSH2_MULTI_DEFAULT;\r
27int p32x_ssh2_multiplier = SSH2_MULTI_DEFAULT;\r
28\r
f8ef8ff7 29void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware\r
30void (*PicoResetHook)(void) = NULL;\r
b0677887 31void (*PicoLineHook)(void) = NULL;\r
cc68a136 32\r
cc68a136 33// to be called once on emu init\r
2aa27095 34void PicoInit(void)\r
cc68a136 35{\r
36 // Blank space for state:\r
37 memset(&Pico,0,sizeof(Pico));\r
38 memset(&PicoPad,0,sizeof(PicoPad));\r
5f9a0d16 39 memset(&PicoPadInt,0,sizeof(PicoPadInt));\r
cc68a136 40\r
41 // Init CPUs:\r
42 SekInit();\r
43 z80_init(); // init even if we aren't going to use it\r
44\r
cc68a136 45 PicoInitMCD();\r
e807ac75 46 PicoSVPInit();\r
be2c4208 47 Pico32xInit();\r
cc68a136 48}\r
49\r
50// to be called once on emu exit\r
51void PicoExit(void)\r
52{\r
602133e1 53 if (PicoAHW & PAHW_MCD)\r
4f265db7 54 PicoExitMCD();\r
ca482e5d 55 PicoCartUnload();\r
cc68a136 56 z80_exit();\r
57\r
45f2f245 58 if (SRam.data)\r
59 free(SRam.data);\r
cc68a136 60}\r
61\r
1cb1584b 62void PicoPower(void)\r
63{\r
053fd9b4 64 Pico.m.frame_count = 0;\r
65\r
1cb1584b 66 // clear all memory of the emulated machine\r
b8a1c09a 67 memset(&Pico.ram,0,(unsigned char *)&Pico.rom - Pico.ram);\r
1cb1584b 68\r
69 memset(&Pico.video,0,sizeof(Pico.video));\r
70 memset(&Pico.m,0,sizeof(Pico.m));\r
71\r
72 Pico.video.pending_ints=0;\r
73 z80_reset();\r
74\r
75 // default VDP register values (based on Fusion)\r
76 Pico.video.reg[0] = Pico.video.reg[1] = 0x04;\r
77 Pico.video.reg[0xc] = 0x81;\r
78 Pico.video.reg[0xf] = 0x02;\r
79\r
602133e1 80 if (PicoAHW & PAHW_MCD)\r
1cb1584b 81 PicoPowerMCD();\r
82\r
db1d3564 83 if (PicoOpt & POPT_EN_32X)\r
974fdb5b 84 PicoPower32x();\r
85\r
1cb1584b 86 PicoReset();\r
87}\r
88\r
1e6b5e39 89PICO_INTERNAL void PicoDetectRegion(void)\r
cc68a136 90{\r
1e6b5e39 91 int support=0, hw=0, i;\r
cc68a136 92 unsigned char pal=0;\r
cc68a136 93\r
1e6b5e39 94 if (PicoRegionOverride)\r
cc68a136 95 {\r
96 support = PicoRegionOverride;\r
97 }\r
98 else\r
99 {\r
100 // Read cartridge region data:\r
af37bca8 101 unsigned short *rd = (unsigned short *)(Pico.rom + 0x1f0);\r
102 int region = (rd[0] << 16) | rd[1];\r
cc68a136 103\r
af37bca8 104 for (i = 0; i < 4; i++)\r
cc68a136 105 {\r
af37bca8 106 int c;\r
cc68a136 107\r
af37bca8 108 c = region >> (i<<3);\r
109 c &= 0xff;\r
110 if (c <= ' ') continue;\r
cc68a136 111\r
51a902ae 112 if (c=='J') support|=1;\r
113 else if (c=='U') support|=4;\r
114 else if (c=='E') support|=8;\r
115 else if (c=='j') {support|=1; break; }\r
116 else if (c=='u') {support|=4; break; }\r
117 else if (c=='e') {support|=8; break; }\r
cc68a136 118 else\r
119 {\r
120 // New style code:\r
121 char s[2]={0,0};\r
122 s[0]=(char)c;\r
123 support|=strtol(s,NULL,16);\r
124 }\r
125 }\r
126 }\r
127\r
51a902ae 128 // auto detection order override\r
129 if (PicoAutoRgnOrder) {\r
130 if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;\r
131 else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;\r
132 else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf;\r
133 }\r
134\r
cc68a136 135 // Try to pick the best hardware value for English/50hz:\r
136 if (support&8) { hw=0xc0; pal=1; } // Europe\r
137 else if (support&4) hw=0x80; // USA\r
138 else if (support&2) { hw=0x40; pal=1; } // Japan PAL\r
139 else if (support&1) hw=0x00; // Japan NTSC\r
140 else hw=0x80; // USA\r
141\r
142 Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached\r
143 Pico.m.pal=pal;\r
1e6b5e39 144}\r
145\r
146int PicoReset(void)\r
147{\r
2ec9bec5 148 if (Pico.romsize <= 0)\r
149 return 1;\r
1e6b5e39 150\r
151 /* must call now, so that banking is reset, and correct vectors get fetched */\r
2ec9bec5 152 if (PicoResetHook)\r
153 PicoResetHook();\r
1e6b5e39 154\r
5f9a0d16 155 memset(&PicoPadInt,0,sizeof(PicoPadInt));\r
2ec9bec5 156 emustatus = 0;\r
157\r
158 if (PicoAHW & PAHW_SMS) {\r
159 PicoResetMS();\r
160 return 0;\r
161 }\r
162\r
163 SekReset();\r
1e6b5e39 164 // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).\r
165 SekSetRealTAS(PicoAHW & PAHW_MCD);\r
166 SekCycleCntT=0;\r
167\r
168 if (PicoAHW & PAHW_MCD)\r
169 // needed for MCD to reset properly, probably some bug hides behind this..\r
170 memset(Pico.ioports,0,sizeof(Pico.ioports));\r
1e6b5e39 171\r
172 Pico.m.dirtyPal = 1;\r
173\r
1832075e 174 Pico.m.z80_bank68k = 0;\r
af37bca8 175 Pico.m.z80_reset = 1;\r
1832075e 176 memset(Pico.zram, 0, sizeof(Pico.zram)); // ??\r
177\r
1e6b5e39 178 PicoDetectRegion();\r
e5fa9817 179 Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal\r
cc68a136 180\r
9d917eea 181 PsndReset(); // pal must be known here\r
cc68a136 182\r
1cb1584b 183 // create an empty "dma" to cause 68k exec start at random frame location\r
2ec9bec5 184 if (Pico.m.dma_xfers == 0 && !(PicoOpt & POPT_DIS_VDP_FIFO))\r
1cb1584b 185 Pico.m.dma_xfers = rand() & 0x1fff;\r
186\r
5ed2a20e 187 SekFinishIdleDet();\r
188\r
602133e1 189 if (PicoAHW & PAHW_MCD) {\r
1cb1584b 190 PicoResetMCD();\r
cc68a136 191 return 0;\r
192 }\r
5ed2a20e 193\r
194 // reinit, so that checksum checks pass\r
195 if (!(PicoOpt & POPT_DIS_IDLE_DET))\r
196 SekInitIdleDet();\r
cc68a136 197\r
1f1ff763 198 if (PicoOpt & POPT_EN_32X)\r
be2c4208 199 PicoReset32x();\r
be2c4208 200\r
1dceadae 201 // reset sram state; enable sram access by default if it doesn't overlap with ROM\r
45f2f245 202 Pico.m.sram_reg = 0;\r
203 if ((SRam.flags & SRF_EEPROM) || Pico.romsize <= SRam.start)\r
204 Pico.m.sram_reg |= SRR_MAPPED;\r
cc68a136 205\r
45f2f245 206 if (SRam.flags & SRF_ENABLED)\r
207 elprintf(EL_STATUS, "sram: %06x - %06x; eeprom: %i", SRam.start, SRam.end,\r
208 !!(SRam.flags & SRF_EEPROM));\r
cc68a136 209\r
210 return 0;\r
211}\r
212\r
46bcb899 213// flush config changes before emu loop starts\r
5e128c6d 214void PicoLoopPrepare(void)\r
215{\r
216 if (PicoRegionOverride)\r
217 // force setting possibly changed..\r
218 Pico.m.pal = (PicoRegionOverride == 2 || PicoRegionOverride == 8) ? 1 : 0;\r
219\r
220 // FIXME: PAL has 313 scanlines..\r
221 scanlines_total = Pico.m.pal ? 312 : 262;\r
db1d3564 222\r
2446536b 223 Pico.m.dirtyPal = 1;\r
224 rendstatus_old = -1;\r
225\r
db1d3564 226 if (PicoAHW & PAHW_32X)\r
1d7a28a7 227 p32x_timers_recalc();\r
5e128c6d 228}\r
229\r
1dceadae 230\r
69996cb7 231// dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)\r
232// same for Outrunners (92-121, when active is set to 24)\r
48df6e9e 233// 96 is VR hack\r
69996cb7 234static const int dma_timings[] = {\r
053fd9b4 235 96, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy\r
236 102, 205, 204, 102, // vblank: 40cell:\r
237 16, 16, 15, 8, // active: 32cell:\r
238 24, 18, 17, 9 // ...\r
4f672280 239};\r
240\r
69996cb7 241static const int dma_bsycles[] = {\r
053fd9b4 242 (488<<8)/96, (488<<8)/167, (488<<8)/166, (488<<8)/83,\r
243 (488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,\r
244 (488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8,\r
245 (488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9\r
312e9ce1 246};\r
247\r
eff55556 248PICO_INTERNAL int CheckDMA(void)\r
4f672280 249{\r
69996cb7 250 int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes\r
251 int xfers = Pico.m.dma_xfers;\r
312e9ce1 252 int dma_op1;\r
4f672280 253\r
312e9ce1 254 if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens\r
255 dma_op1 = dma_op;\r
256 if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?\r
257 if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?\r
69996cb7 258 xfers_can = dma_timings[dma_op];\r
9761a7d0 259 if(xfers <= xfers_can)\r
260 {\r
4f672280 261 if(dma_op&2) Pico.video.status&=~2; // dma no longer busy\r
262 else {\r
69996cb7 263 burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..\r
4f672280 264 }\r
69996cb7 265 Pico.m.dma_xfers = 0;\r
4f672280 266 } else {\r
267 if(!(dma_op&2)) burn = 488;\r
69996cb7 268 Pico.m.dma_xfers -= xfers_can;\r
4f672280 269 }\r
270\r
69996cb7 271 elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%i]", Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());\r
312e9ce1 272 //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);\r
273 return burn;\r
4f672280 274}\r
275\r
bf5fbbb4 276static __inline void SekRunM68k(int cyc)\r
cc68a136 277{\r
278 int cyc_do;\r
f6c49d38 279 pprof_start(m68k);\r
280\r
cc68a136 281 SekCycleAim+=cyc;\r
053fd9b4 282 if ((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;\r
03e4f2a3 283#if defined(EMU_CORE_DEBUG)\r
284 // this means we do run-compare\r
b5e5172d 285 SekCycleCnt+=CM_compareRun(cyc_do, 0);\r
cc68a136 286#elif defined(EMU_C68K)\r
3aa1e148 287 PicoCpuCM68k.cycles=cyc_do;\r
288 CycloneRun(&PicoCpuCM68k);\r
289 SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;\r
cc68a136 290#elif defined(EMU_M68K)\r
291 SekCycleCnt+=m68k_execute(cyc_do);\r
70357ce5 292#elif defined(EMU_F68K)\r
c060a9ab 293 SekCycleCnt+=fm68k_emulate(cyc_do+1, 0, 0);\r
cc68a136 294#endif\r
f6c49d38 295\r
296 pprof_end(m68k);\r
cc68a136 297}\r
298\r
efcba75f 299#include "pico_cmn.c"\r
4b9c5888 300\r
301int z80stopCycle;\r
302int z80_cycle_cnt; /* 'done' z80 cycles before z80_run() */\r
303int z80_cycle_aim;\r
304int z80_scanline;\r
305int z80_scanline_cycles; /* cycles done until z80_scanline */\r
306\r
307/* sync z80 to 68k */\r
308PICO_INTERNAL void PicoSyncZ80(int m68k_cycles_done)\r
cc68a136 309{\r
4b9c5888 310 int cnt;\r
311 z80_cycle_aim = cycles_68k_to_z80(m68k_cycles_done);\r
312 cnt = z80_cycle_aim - z80_cycle_cnt;\r
cc68a136 313\r
f6c49d38 314 pprof_start(z80);\r
315\r
e5fa9817 316 elprintf(EL_BUSREQ, "z80 sync %i (%i|%i -> %i|%i)", cnt, z80_cycle_cnt, z80_cycle_cnt / 228,\r
4b9c5888 317 z80_cycle_aim, z80_cycle_aim / 228);\r
318\r
319 if (cnt > 0)\r
320 z80_cycle_cnt += z80_run(cnt);\r
f6c49d38 321\r
322 pprof_end(z80);\r
cc68a136 323}\r
324\r
4b9c5888 325\r
2aa27095 326void PicoFrame(void)\r
cc68a136 327{\r
f6c49d38 328 pprof_start(frame);\r
329\r
8c1952f0 330 Pico.m.frame_count++;\r
331\r
19954be1 332 if (PicoAHW & PAHW_SMS) {\r
333 PicoFrameMS();\r
f6c49d38 334 goto end;\r
cc68a136 335 }\r
19954be1 336\r
974fdb5b 337 // TODO: MCD+32X\r
19954be1 338 if (PicoAHW & PAHW_MCD) {\r
339 PicoFrameMCD();\r
f6c49d38 340 goto end;\r
3e49ffd0 341 }\r
cc68a136 342\r
974fdb5b 343 if (PicoAHW & PAHW_32X) {\r
344 PicoFrame32x();\r
f6c49d38 345 goto end;\r
974fdb5b 346 }\r
347\r
cc68a136 348 //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode\r
349\r
19954be1 350 PicoFrameStart();\r
2aa27095 351 PicoFrameHints();\r
f6c49d38 352\r
353end:\r
354 pprof_end(frame);\r
cc68a136 355}\r
356\r
a12e0116 357void PicoFrameDrawOnly(void)\r
358{\r
87b0845f 359 if (!(PicoAHW & PAHW_SMS)) {\r
360 PicoFrameStart();\r
361 PicoDrawSync(223, 0);\r
362 } else {\r
363 PicoFrameDrawOnlyMS();\r
364 }\r
a12e0116 365}\r
366\r
4609d0cd 367void PicoGetInternal(pint_t which, pint_ret_t *r)\r
8e5427a0 368{\r
369 switch (which)\r
370 {\r
4609d0cd 371 case PI_ROM: r->vptr = Pico.rom; break;\r
372 case PI_ISPAL: r->vint = Pico.m.pal; break;\r
373 case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break;\r
374 case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break;\r
8e5427a0 375 }\r
8e5427a0 376}\r
377\r
66fdc0f0 378// callback to output message from emu\r
379void (*PicoMessage)(const char *msg)=NULL;\r
cc68a136 380\r