z80/ym2612 reset handling improved
[picodrive.git] / Pico / Pico.c
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CommitLineData
1// PicoDrive\r
2\r
3// (c) Copyright 2004 Dave, All rights reserved.\r
4// (c) Copyright 2006-2008 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#include "sound/ym2612.h"\r
12\r
13int PicoVer=0x0133;\r
14struct Pico Pico;\r
15int PicoOpt = 0;\r
16int PicoSkipFrame = 0; // skip rendering frame?\r
17int emustatus = 0; // rapid_ym2612, multi_ym_updates\r
18int PicoPad[2]; // Joypads, format is SACB RLDU\r
19int PicoAHW = 0; // active addon hardware: scd_active, 32x_active, svp_active, pico_active\r
20int PicoRegionOverride = 0; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe\r
21int PicoAutoRgnOrder = 0;\r
22struct PicoSRAM SRam = {0,};\r
23\r
24void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware\r
25void (*PicoResetHook)(void) = NULL;\r
26void (*PicoLineHook)(void) = NULL;\r
27\r
28// to be called once on emu init\r
29void PicoInit(void)\r
30{\r
31 // Blank space for state:\r
32 memset(&Pico,0,sizeof(Pico));\r
33 memset(&PicoPad,0,sizeof(PicoPad));\r
34\r
35 // Init CPUs:\r
36 SekInit();\r
37 z80_init(); // init even if we aren't going to use it\r
38\r
39 PicoInitMCD();\r
40 PicoSVPInit();\r
41\r
42 SRam.data=0;\r
43}\r
44\r
45// to be called once on emu exit\r
46void PicoExit(void)\r
47{\r
48 if (PicoAHW & PAHW_MCD)\r
49 PicoExitMCD();\r
50 z80_exit();\r
51\r
52 if (SRam.data) free(SRam.data); SRam.data=0;\r
53}\r
54\r
55void PicoPower(void)\r
56{\r
57 unsigned char sram_reg=Pico.m.sram_reg; // must be preserved\r
58\r
59 Pico.m.frame_count = 0;\r
60\r
61 // clear all memory of the emulated machine\r
62 memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);\r
63\r
64 memset(&Pico.video,0,sizeof(Pico.video));\r
65 memset(&Pico.m,0,sizeof(Pico.m));\r
66\r
67 Pico.video.pending_ints=0;\r
68 z80_reset();\r
69\r
70 // default VDP register values (based on Fusion)\r
71 Pico.video.reg[0] = Pico.video.reg[1] = 0x04;\r
72 Pico.video.reg[0xc] = 0x81;\r
73 Pico.video.reg[0xf] = 0x02;\r
74\r
75 if (PicoAHW & PAHW_MCD)\r
76 PicoPowerMCD();\r
77\r
78 Pico.m.sram_reg=sram_reg;\r
79 PicoReset();\r
80}\r
81\r
82PICO_INTERNAL void PicoDetectRegion(void)\r
83{\r
84 int support=0, hw=0, i;\r
85 unsigned char pal=0;\r
86\r
87 if (PicoRegionOverride)\r
88 {\r
89 support = PicoRegionOverride;\r
90 }\r
91 else\r
92 {\r
93 // Read cartridge region data:\r
94 int region=PicoRead32(0x1f0);\r
95\r
96 for (i=0;i<4;i++)\r
97 {\r
98 int c=0;\r
99\r
100 c=region>>(i<<3); c&=0xff;\r
101 if (c<=' ') continue;\r
102\r
103 if (c=='J') support|=1;\r
104 else if (c=='U') support|=4;\r
105 else if (c=='E') support|=8;\r
106 else if (c=='j') {support|=1; break; }\r
107 else if (c=='u') {support|=4; break; }\r
108 else if (c=='e') {support|=8; break; }\r
109 else\r
110 {\r
111 // New style code:\r
112 char s[2]={0,0};\r
113 s[0]=(char)c;\r
114 support|=strtol(s,NULL,16);\r
115 }\r
116 }\r
117 }\r
118\r
119 // auto detection order override\r
120 if (PicoAutoRgnOrder) {\r
121 if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;\r
122 else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;\r
123 else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf;\r
124 }\r
125\r
126 // Try to pick the best hardware value for English/50hz:\r
127 if (support&8) { hw=0xc0; pal=1; } // Europe\r
128 else if (support&4) hw=0x80; // USA\r
129 else if (support&2) { hw=0x40; pal=1; } // Japan PAL\r
130 else if (support&1) hw=0x00; // Japan NTSC\r
131 else hw=0x80; // USA\r
132\r
133 Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached\r
134 Pico.m.pal=pal;\r
135}\r
136\r
137int PicoReset(void)\r
138{\r
139 unsigned char sram_reg=Pico.m.sram_reg; // must be preserved\r
140\r
141 if (Pico.romsize<=0) return 1;\r
142\r
143 /* must call now, so that banking is reset, and correct vectors get fetched */\r
144 if (PicoResetHook) PicoResetHook();\r
145\r
146 PicoMemReset();\r
147 SekReset();\r
148 // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).\r
149 SekSetRealTAS(PicoAHW & PAHW_MCD);\r
150 SekCycleCntT=0;\r
151\r
152 if (PicoAHW & PAHW_MCD)\r
153 // needed for MCD to reset properly, probably some bug hides behind this..\r
154 memset(Pico.ioports,0,sizeof(Pico.ioports));\r
155 emustatus = 0;\r
156\r
157 Pico.m.dirtyPal = 1;\r
158\r
159 Pico.m.z80_bank68k = 0;\r
160 memset(Pico.zram, 0, sizeof(Pico.zram)); // ??\r
161\r
162 PicoDetectRegion();\r
163 Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal\r
164\r
165 PsndReset(); // pal must be known here\r
166\r
167 // create an empty "dma" to cause 68k exec start at random frame location\r
168 if (Pico.m.dma_xfers == 0 && !(PicoOpt&POPT_DIS_VDP_FIFO))\r
169 Pico.m.dma_xfers = rand() & 0x1fff;\r
170\r
171 if (PicoAHW & PAHW_MCD) {\r
172 PicoResetMCD();\r
173 return 0;\r
174 }\r
175 else {\r
176 // reinit, so that checksum checks pass\r
177 SekFinishIdleDet();\r
178 if (!(PicoOpt & POPT_DIS_IDLE_DET))\r
179 SekInitIdleDet();\r
180 }\r
181\r
182 // reset sram state; enable sram access by default if it doesn't overlap with ROM\r
183 Pico.m.sram_reg=sram_reg&0x14;\r
184 if (!(Pico.m.sram_reg&4) && Pico.romsize <= SRam.start) Pico.m.sram_reg |= 1;\r
185\r
186 elprintf(EL_STATUS, "sram: det: %i; eeprom: %i; start: %06x; end: %06x",\r
187 (Pico.m.sram_reg>>4)&1, (Pico.m.sram_reg>>2)&1, SRam.start, SRam.end);\r
188\r
189 return 0;\r
190}\r
191\r
192\r
193// dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)\r
194// same for Outrunners (92-121, when active is set to 24)\r
195// 96 is VR hack\r
196static const int dma_timings[] = {\r
197 96, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy\r
198 102, 205, 204, 102, // vblank: 40cell:\r
199 16, 16, 15, 8, // active: 32cell:\r
200 24, 18, 17, 9 // ...\r
201};\r
202\r
203static const int dma_bsycles[] = {\r
204 (488<<8)/96, (488<<8)/167, (488<<8)/166, (488<<8)/83,\r
205 (488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,\r
206 (488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8,\r
207 (488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9\r
208};\r
209\r
210PICO_INTERNAL int CheckDMA(void)\r
211{\r
212 int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes\r
213 int xfers = Pico.m.dma_xfers;\r
214 int dma_op1;\r
215\r
216 if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens\r
217 dma_op1 = dma_op;\r
218 if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?\r
219 if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?\r
220 xfers_can = dma_timings[dma_op];\r
221 if(xfers <= xfers_can)\r
222 {\r
223 if(dma_op&2) Pico.video.status&=~2; // dma no longer busy\r
224 else {\r
225 burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..\r
226 }\r
227 Pico.m.dma_xfers = 0;\r
228 } else {\r
229 if(!(dma_op&2)) burn = 488;\r
230 Pico.m.dma_xfers -= xfers_can;\r
231 }\r
232\r
233 elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%i]", Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());\r
234 //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);\r
235 return burn;\r
236}\r
237\r
238static __inline void SekRunM68k(int cyc)\r
239{\r
240 int cyc_do;\r
241 SekCycleAim+=cyc;\r
242 if ((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;\r
243#if defined(EMU_CORE_DEBUG)\r
244 // this means we do run-compare\r
245 SekCycleCnt+=CM_compareRun(cyc_do, 0);\r
246#elif defined(EMU_C68K)\r
247 PicoCpuCM68k.cycles=cyc_do;\r
248 CycloneRun(&PicoCpuCM68k);\r
249 SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;\r
250#elif defined(EMU_M68K)\r
251 SekCycleCnt+=m68k_execute(cyc_do);\r
252#elif defined(EMU_F68K)\r
253 SekCycleCnt+=fm68k_emulate(cyc_do+1, 0, 0);\r
254#endif\r
255}\r
256\r
257\r
258// to be called on 224 or line_sample scanlines only\r
259static __inline void getSamples(int y)\r
260{\r
261#if SIMPLE_WRITE_SOUND\r
262 if (y != 224) return;\r
263 PsndRender(0, PsndLen);\r
264 if (PicoWriteSound) PicoWriteSound(PsndLen);\r
265 PsndClear();\r
266#else\r
267 static int curr_pos = 0;\r
268\r
269 if(y == 224) {\r
270 if(emustatus & 2)\r
271 curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);\r
272 else curr_pos = PsndRender(0, PsndLen);\r
273 if (emustatus&1) emustatus|=2; else emustatus&=~2;\r
274 if (PicoWriteSound) PicoWriteSound(curr_pos);\r
275 // clear sound buffer\r
276 PsndClear();\r
277 }\r
278 else if(emustatus & 3) {\r
279 emustatus|= 2;\r
280 emustatus&=~1;\r
281 curr_pos = PsndRender(0, PsndLen/2);\r
282 }\r
283#endif\r
284}\r
285\r
286\r
287#include "PicoFrameHints.c"\r
288\r
289\r
290int z80stopCycle;\r
291int z80_cycle_cnt; /* 'done' z80 cycles before z80_run() */\r
292int z80_cycle_aim;\r
293int z80_scanline;\r
294int z80_scanline_cycles; /* cycles done until z80_scanline */\r
295\r
296/* sync z80 to 68k */\r
297PICO_INTERNAL void PicoSyncZ80(int m68k_cycles_done)\r
298{\r
299 int cnt;\r
300 z80_cycle_aim = cycles_68k_to_z80(m68k_cycles_done);\r
301 cnt = z80_cycle_aim - z80_cycle_cnt;\r
302\r
303 elprintf(EL_BUSREQ, "z80 sync %i (%i|%i -> %i|%i)", cnt, z80_cycle_cnt, z80_cycle_cnt / 228,\r
304 z80_cycle_aim, z80_cycle_aim / 228);\r
305\r
306 if (cnt > 0)\r
307 z80_cycle_cnt += z80_run(cnt);\r
308}\r
309\r
310\r
311void PicoFrame(void)\r
312{\r
313 Pico.m.frame_count++;\r
314\r
315 if (PicoAHW & PAHW_MCD) {\r
316 PicoFrameMCD();\r
317 return;\r
318 }\r
319\r
320 //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode\r
321\r
322 if (!(PicoOpt&POPT_ALT_RENDERER))\r
323 PicoFrameStart();\r
324\r
325 PicoFrameHints();\r
326}\r
327\r
328void PicoFrameDrawOnly(void)\r
329{\r
330 PicoFrameStart();\r
331 PicoDrawSync(223, 0);\r
332}\r
333\r
334void PicoGetInternal(pint_t which, pint_ret_t *r)\r
335{\r
336 switch (which)\r
337 {\r
338 case PI_ROM: r->vptr = Pico.rom; break;\r
339 case PI_ISPAL: r->vint = Pico.m.pal; break;\r
340 case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break;\r
341 case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break;\r
342 }\r
343}\r
344\r
345// callback to output message from emu\r
346void (*PicoMessage)(const char *msg)=NULL;\r
347\r
348#if 1 // defined(__DEBUG_PRINT)\r
349#define bit(r, x) ((r>>x)&1)\r
350void z80_debug(char *dstr);\r
351char *debugString(void)\r
352{\r
353#if 1\r
354 static char dstr[1024];\r
355 struct PicoVideo *pv=&Pico.video;\r
356 unsigned char *reg=pv->reg, r;\r
357 extern int HighPreSpr[];\r
358 int i, sprites_lo, sprites_hi;\r
359 char *dstrp;\r
360\r
361 sprites_lo = sprites_hi = 0;\r
362 for (i = 0; HighPreSpr[i] != 0; i+=2)\r
363 if (HighPreSpr[i+1] & 0x8000)\r
364 sprites_hi++;\r
365 else sprites_lo++;\r
366\r
367 dstrp = dstr;\r
368 sprintf(dstrp, "mode set 1: %02x spr lo: %2i, spr hi: %2i\n", (r=reg[0]), sprites_lo, sprites_hi);\r
369 dstrp+=strlen(dstrp);\r
370 sprintf(dstrp, "display_disable: %i, M3: %i, palette: %i, ?, hints: %i\n", bit(r,0), bit(r,1), bit(r,2), bit(r,4));\r
371 dstrp+=strlen(dstrp);\r
372 sprintf(dstrp, "mode set 2: %02x hcnt: %i\n", (r=reg[1]), pv->reg[10]); dstrp+=strlen(dstrp);\r
373 sprintf(dstrp, "SMS/gen: %i, pal: %i, dma: %i, vints: %i, disp: %i, TMS: %i\n", bit(r,2), bit(r,3), bit(r,4),\r
374 bit(r,5), bit(r,6), bit(r,7)); dstrp+=strlen(dstrp);\r
375 sprintf(dstrp, "mode set 3: %02x\n", (r=reg[0xB])); dstrp+=strlen(dstrp);\r
376 sprintf(dstrp, "LSCR: %i, HSCR: %i, 2cell vscroll: %i, IE2: %i\n", bit(r,0), bit(r,1), bit(r,2), bit(r,3)); dstrp+=strlen(dstrp);\r
377 sprintf(dstrp, "mode set 4: %02x\n", (r=reg[0xC])); dstrp+=strlen(dstrp);\r
378 sprintf(dstrp, "interlace: %i%i, cells: %i, shadow: %i\n", bit(r,2), bit(r,1), (r&0x80) ? 40 : 32, bit(r,3));\r
379 dstrp+=strlen(dstrp);\r
380 sprintf(dstrp, "scroll size: w: %i, h: %i SRAM: %i; eeprom: %i (%i)\n", reg[0x10]&3, (reg[0x10]&0x30)>>4,\r
381 bit(Pico.m.sram_reg, 4), bit(Pico.m.sram_reg, 2), SRam.eeprom_type); dstrp+=strlen(dstrp);\r
382 sprintf(dstrp, "sram range: %06x-%06x, reg: %02x\n", SRam.start, SRam.end, Pico.m.sram_reg); dstrp+=strlen(dstrp);\r
383 sprintf(dstrp, "pend int: v:%i, h:%i, vdp status: %04x\n", bit(pv->pending_ints,5), bit(pv->pending_ints,4), pv->status);\r
384 dstrp+=strlen(dstrp);\r
385#if defined(EMU_C68K)\r
386 sprintf(dstrp, "M68k: PC: %06x, st_flg: %x, cycles: %u\n", SekPc, PicoCpuCM68k.state_flags, SekCyclesDoneT());\r
387 dstrp+=strlen(dstrp);\r
388 sprintf(dstrp, "d0=%08x, a0=%08x, osp=%08x, irql=%i\n", PicoCpuCM68k.d[0], PicoCpuCM68k.a[0], PicoCpuCM68k.osp, PicoCpuCM68k.irq); dstrp+=strlen(dstrp);\r
389 sprintf(dstrp, "d1=%08x, a1=%08x, sr=%04x\n", PicoCpuCM68k.d[1], PicoCpuCM68k.a[1], CycloneGetSr(&PicoCpuCM68k)); dstrp+=strlen(dstrp);\r
390 for(r=2; r < 8; r++) {\r
391 sprintf(dstrp, "d%i=%08x, a%i=%08x\n", r, PicoCpuCM68k.d[r], r, PicoCpuCM68k.a[r]); dstrp+=strlen(dstrp);\r
392 }\r
393#elif defined(EMU_M68K)\r
394 sprintf(dstrp, "M68k: PC: %06x, cycles: %u, irql: %i\n", SekPc, SekCyclesDoneT(), PicoCpuMM68k.int_level>>8); dstrp+=strlen(dstrp);\r
395#elif defined(EMU_F68K)\r
396 sprintf(dstrp, "M68k: PC: %06x, cycles: %u, irql: %i\n", SekPc, SekCyclesDoneT(), PicoCpuFM68k.interrupts[0]); dstrp+=strlen(dstrp);\r
397#endif\r
398 sprintf(dstrp, "z80Run: %i, pal: %i, frame#: %i\n", Pico.m.z80Run, Pico.m.pal, Pico.m.frame_count); dstrp+=strlen(dstrp);\r
399 z80_debug(dstrp); dstrp+=strlen(dstrp);\r
400 if (strlen(dstr) > sizeof(dstr))\r
401 printf("warning: debug buffer overflow (%i/%i)\n", strlen(dstr), sizeof(dstr));\r
402\r
403#else\r
404 struct PicoVideo *pvid=&Pico.video;\r
405 int table=0;\r
406 int i,u,n,link=0;\r
407 static char dstr[1024*8];\r
408 dstr[0] = 0;\r
409\r
410 table=pvid->reg[5]&0x7f;\r
411 if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode\r
412 table<<=8; // Get sprite table address/2\r
413\r
414 for (i=u=n=0; u < 80 && n < 20; u++)\r
415 {\r
416 unsigned int *sprite;\r
417 int code, code2, sx, sy, height;\r
418\r
419 sprite=(unsigned int *)(Pico.vram+((table+(link<<2))&0x7ffc)); // Find sprite\r
420\r
421 // get sprite info\r
422 code = sprite[0];\r
423\r
424 // check if it is on this line\r
425 sy = (code&0x1ff);//-0x80;\r
426 height = ((code>>24)&3)+1;\r
427\r
428 // masking sprite?\r
429 code2 = sprite[1];\r
430 sx = (code2>>16)&0x1ff;\r
431\r
432 printf("#%02i x: %03i y: %03i %ix%i\n", u, sx, sy, ((code>>26)&3)+1, height);\r
433\r
434 link=(code>>16)&0x7f;\r
435 if(!link) break; // End of sprites\r
436 }\r
437#endif\r
438\r
439 return dstr;\r
440}\r
441#endif\r