src/gb/gb.c (view raw)
1/* Copyright (c) 2013-2016 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#include <mgba/internal/gb/gb.h>
7
8#include <mgba/internal/gb/io.h>
9#include <mgba/internal/gb/mbc.h>
10#include <mgba/internal/lr35902/lr35902.h>
11
12#include <mgba/core/core.h>
13#include <mgba/core/cheats.h>
14#include <mgba-util/crc32.h>
15#include <mgba-util/memory.h>
16#include <mgba-util/math.h>
17#include <mgba-util/patch.h>
18#include <mgba-util/vfs.h>
19
20#define CLEANUP_THRESHOLD 15
21
22const uint32_t CGB_LR35902_FREQUENCY = 0x800000;
23const uint32_t SGB_LR35902_FREQUENCY = 0x418B1E;
24
25const uint32_t GB_COMPONENT_MAGIC = 0x400000;
26
27static const uint8_t _knownHeader[4] = { 0xCE, 0xED, 0x66, 0x66};
28
29#define DMG_BIOS_CHECKSUM 0xC2F5CC97
30#define DMG_2_BIOS_CHECKSUM 0x59C8598E
31#define MGB_BIOS_CHECKSUM 0xE6920754
32#define SGB_BIOS_CHECKSUM 0xEC8A83B9
33#define CGB_BIOS_CHECKSUM 0x41884E46
34
35mLOG_DEFINE_CATEGORY(GB, "GB", "gb");
36
37static void GBInit(void* cpu, struct mCPUComponent* component);
38static void GBDeinit(struct mCPUComponent* component);
39static void GBInterruptHandlerInit(struct LR35902InterruptHandler* irqh);
40static void GBProcessEvents(struct LR35902Core* cpu);
41static void GBSetInterrupts(struct LR35902Core* cpu, bool enable);
42static uint16_t GBIRQVector(struct LR35902Core* cpu);
43static void GBIllegal(struct LR35902Core* cpu);
44static void GBStop(struct LR35902Core* cpu);
45
46static void _enableInterrupts(struct mTiming* timing, void* user, uint32_t cyclesLate);
47
48#ifdef FIXED_ROM_BUFFER
49extern uint32_t* romBuffer;
50extern size_t romBufferSize;
51#endif
52
53void GBCreate(struct GB* gb) {
54 gb->d.id = GB_COMPONENT_MAGIC;
55 gb->d.init = GBInit;
56 gb->d.deinit = GBDeinit;
57}
58
59static void GBInit(void* cpu, struct mCPUComponent* component) {
60 struct GB* gb = (struct GB*) component;
61 gb->cpu = cpu;
62 gb->sync = NULL;
63
64 GBInterruptHandlerInit(&gb->cpu->irqh);
65 GBMemoryInit(gb);
66
67 gb->video.p = gb;
68 GBVideoInit(&gb->video);
69
70 gb->audio.p = gb;
71 GBAudioInit(&gb->audio, 2048, &gb->memory.io[REG_NR52], GB_AUDIO_DMG); // TODO: Remove magic constant
72
73 gb->sio.p = gb;
74 GBSIOInit(&gb->sio);
75
76 gb->timer.p = gb;
77
78 gb->model = GB_MODEL_AUTODETECT;
79
80 gb->biosVf = NULL;
81 gb->romVf = NULL;
82 gb->sramVf = NULL;
83 gb->sramRealVf = NULL;
84
85 gb->isPristine = false;
86 gb->pristineRomSize = 0;
87 gb->yankedRomSize = 0;
88
89 mCoreCallbacksListInit(&gb->coreCallbacks, 0);
90 gb->stream = NULL;
91
92 mTimingInit(&gb->timing, &gb->cpu->cycles, &gb->cpu->nextEvent);
93 gb->audio.timing = &gb->timing;
94
95 gb->eiPending.name = "GB EI";
96 gb->eiPending.callback = _enableInterrupts;
97 gb->eiPending.context = gb;
98 gb->eiPending.priority = 0;
99}
100
101static void GBDeinit(struct mCPUComponent* component) {
102 struct GB* gb = (struct GB*) component;
103 mTimingDeinit(&gb->timing);
104}
105
106bool GBLoadROM(struct GB* gb, struct VFile* vf) {
107 if (!vf) {
108 return false;
109 }
110 GBUnloadROM(gb);
111 gb->romVf = vf;
112 gb->pristineRomSize = vf->size(vf);
113 vf->seek(vf, 0, SEEK_SET);
114 gb->isPristine = true;
115#ifdef FIXED_ROM_BUFFER
116 if (gb->pristineRomSize <= romBufferSize) {
117 gb->memory.rom = romBuffer;
118 vf->read(vf, romBuffer, gb->pristineRomSize);
119 }
120#else
121 gb->memory.rom = vf->map(vf, gb->pristineRomSize, MAP_READ);
122#endif
123 if (!gb->memory.rom) {
124 return false;
125 }
126 gb->yankedRomSize = 0;
127 gb->memory.romBase = gb->memory.rom;
128 gb->memory.romSize = gb->pristineRomSize;
129 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
130 GBMBCInit(gb);
131
132 if (gb->cpu) {
133 struct LR35902Core* cpu = gb->cpu;
134 cpu->memory.setActiveRegion(cpu, cpu->pc);
135 }
136
137 // TODO: error check
138 return true;
139}
140
141static void GBSramDeinit(struct GB* gb) {
142 if (gb->sramVf) {
143 gb->sramVf->unmap(gb->sramVf, gb->memory.sram, gb->sramSize);
144 if (gb->memory.mbcType == GB_MBC3_RTC && gb->sramVf == gb->sramRealVf) {
145 GBMBCRTCWrite(gb);
146 }
147 gb->sramVf = NULL;
148 } else if (gb->memory.sram) {
149 mappedMemoryFree(gb->memory.sram, gb->sramSize);
150 }
151 gb->memory.sram = 0;
152}
153
154bool GBLoadSave(struct GB* gb, struct VFile* vf) {
155 GBSramDeinit(gb);
156 gb->sramVf = vf;
157 gb->sramRealVf = vf;
158 if (gb->sramSize) {
159 GBResizeSram(gb, gb->sramSize);
160 GBMBCSwitchSramBank(gb, gb->memory.sramCurrentBank);
161 }
162 return vf;
163}
164
165void GBResizeSram(struct GB* gb, size_t size) {
166 if (gb->memory.sram && size <= gb->sramSize) {
167 return;
168 }
169 struct VFile* vf = gb->sramVf;
170 if (vf) {
171 if (vf == gb->sramRealVf) {
172 ssize_t vfSize = vf->size(vf);
173 if (vfSize >= 0 && (size_t) vfSize < size) {
174 uint8_t extdataBuffer[0x100];
175 if (vfSize & 0xFF) {
176 vf->seek(vf, -(vfSize & 0xFF), SEEK_END);
177 vf->read(vf, extdataBuffer, vfSize & 0xFF);
178 }
179 if (gb->memory.sram) {
180 vf->unmap(vf, gb->memory.sram, gb->sramSize);
181 }
182 vf->truncate(vf, size + (vfSize & 0xFF));
183 if (vfSize & 0xFF) {
184 vf->seek(vf, size, SEEK_SET);
185 vf->write(vf, extdataBuffer, vfSize & 0xFF);
186 }
187 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
188 memset(&gb->memory.sram[gb->sramSize], 0xFF, size - gb->sramSize);
189 } else if (size > gb->sramSize || !gb->memory.sram) {
190 if (gb->memory.sram) {
191 vf->unmap(vf, gb->memory.sram, gb->sramSize);
192 }
193 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
194 }
195 } else {
196 if (gb->memory.sram) {
197 vf->unmap(vf, gb->memory.sram, gb->sramSize);
198 }
199 gb->memory.sram = vf->map(vf, size, MAP_READ);
200 }
201 if (gb->memory.sram == (void*) -1) {
202 gb->memory.sram = NULL;
203 }
204 } else {
205 uint8_t* newSram = anonymousMemoryMap(size);
206 if (gb->memory.sram) {
207 if (size > gb->sramSize) {
208 memcpy(newSram, gb->memory.sram, gb->sramSize);
209 memset(&newSram[gb->sramSize], 0xFF, size - gb->sramSize);
210 } else {
211 memcpy(newSram, gb->memory.sram, size);
212 }
213 mappedMemoryFree(gb->memory.sram, gb->sramSize);
214 } else {
215 memset(newSram, 0xFF, size);
216 }
217 gb->memory.sram = newSram;
218 }
219 if (gb->sramSize < size) {
220 gb->sramSize = size;
221 }
222}
223
224void GBSramClean(struct GB* gb, uint32_t frameCount) {
225 // TODO: Share with GBASavedataClean
226 if (!gb->sramVf) {
227 return;
228 }
229 if (gb->sramDirty & GB_SRAM_DIRT_NEW) {
230 gb->sramDirtAge = frameCount;
231 gb->sramDirty &= ~GB_SRAM_DIRT_NEW;
232 if (!(gb->sramDirty & GB_SRAM_DIRT_SEEN)) {
233 gb->sramDirty |= GB_SRAM_DIRT_SEEN;
234 }
235 } else if ((gb->sramDirty & GB_SRAM_DIRT_SEEN) && frameCount - gb->sramDirtAge > CLEANUP_THRESHOLD) {
236 if (gb->sramMaskWriteback) {
237 GBSavedataUnmask(gb);
238 }
239 if (gb->memory.mbcType == GB_MBC3_RTC) {
240 GBMBCRTCWrite(gb);
241 }
242 gb->sramDirty = 0;
243 if (gb->memory.sram && gb->sramVf->sync(gb->sramVf, gb->memory.sram, gb->sramSize)) {
244 mLOG(GB_MEM, INFO, "Savedata synced");
245 } else {
246 mLOG(GB_MEM, INFO, "Savedata failed to sync!");
247 }
248 }
249}
250
251void GBSavedataMask(struct GB* gb, struct VFile* vf, bool writeback) {
252 GBSramDeinit(gb);
253 gb->sramVf = vf;
254 gb->sramMaskWriteback = writeback;
255 gb->memory.sram = vf->map(vf, gb->sramSize, MAP_READ);
256 GBMBCSwitchSramBank(gb, gb->memory.sramCurrentBank);
257}
258
259void GBSavedataUnmask(struct GB* gb) {
260 if (!gb->sramRealVf || gb->sramVf == gb->sramRealVf) {
261 return;
262 }
263 struct VFile* vf = gb->sramVf;
264 GBSramDeinit(gb);
265 gb->sramVf = gb->sramRealVf;
266 gb->memory.sram = gb->sramVf->map(gb->sramVf, gb->sramSize, MAP_WRITE);
267 if (gb->sramMaskWriteback) {
268 vf->seek(vf, 0, SEEK_SET);
269 vf->read(vf, gb->memory.sram, gb->sramSize);
270 gb->sramMaskWriteback = false;
271 }
272 GBMBCSwitchSramBank(gb, gb->memory.sramCurrentBank);
273 vf->close(vf);
274}
275
276void GBUnloadROM(struct GB* gb) {
277 // TODO: Share with GBAUnloadROM
278 if (gb->memory.rom && gb->memory.romBase != gb->memory.rom && !gb->isPristine) {
279 free(gb->memory.romBase);
280 }
281 if (gb->memory.rom && !gb->isPristine) {
282 if (gb->yankedRomSize) {
283 gb->yankedRomSize = 0;
284 }
285 mappedMemoryFree(gb->memory.rom, GB_SIZE_CART_MAX);
286 }
287
288 if (gb->romVf) {
289#ifndef FIXED_ROM_BUFFER
290 gb->romVf->unmap(gb->romVf, gb->memory.rom, gb->pristineRomSize);
291#endif
292 gb->romVf->close(gb->romVf);
293 gb->romVf = NULL;
294 }
295 gb->memory.rom = NULL;
296 gb->memory.mbcType = GB_MBC_AUTODETECT;
297 gb->isPristine = false;
298
299 gb->sramMaskWriteback = false;
300 GBSramDeinit(gb);
301 if (gb->sramRealVf) {
302 gb->sramRealVf->close(gb->sramRealVf);
303 }
304 gb->sramRealVf = NULL;
305 gb->sramVf = NULL;
306 if (gb->memory.cam && gb->memory.cam->stopRequestImage) {
307 gb->memory.cam->stopRequestImage(gb->memory.cam);
308 }
309}
310
311void GBSynthesizeROM(struct VFile* vf) {
312 if (!vf) {
313 return;
314 }
315 const struct GBCartridge cart = {
316 .logo = { _knownHeader[0], _knownHeader[1], _knownHeader[2], _knownHeader[3]}
317 };
318
319 vf->seek(vf, 0x100, SEEK_SET);
320 vf->write(vf, &cart, sizeof(cart));
321}
322
323void GBLoadBIOS(struct GB* gb, struct VFile* vf) {
324 gb->biosVf = vf;
325}
326
327void GBApplyPatch(struct GB* gb, struct Patch* patch) {
328 size_t patchedSize = patch->outputSize(patch, gb->memory.romSize);
329 if (!patchedSize) {
330 return;
331 }
332 if (patchedSize > GB_SIZE_CART_MAX) {
333 patchedSize = GB_SIZE_CART_MAX;
334 }
335 void* newRom = anonymousMemoryMap(GB_SIZE_CART_MAX);
336 if (!patch->applyPatch(patch, gb->memory.rom, gb->pristineRomSize, newRom, patchedSize)) {
337 mappedMemoryFree(newRom, GB_SIZE_CART_MAX);
338 return;
339 }
340 if (gb->romVf) {
341#ifndef FIXED_ROM_BUFFER
342 gb->romVf->unmap(gb->romVf, gb->memory.rom, gb->pristineRomSize);
343#endif
344 gb->romVf->close(gb->romVf);
345 gb->romVf = NULL;
346 }
347 gb->isPristine = false;
348 if (gb->memory.romBase == gb->memory.rom) {
349 gb->memory.romBase = newRom;
350 }
351 gb->memory.rom = newRom;
352 gb->memory.romSize = patchedSize;
353 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
354 gb->cpu->memory.setActiveRegion(gb->cpu, gb->cpu->pc);
355}
356
357void GBDestroy(struct GB* gb) {
358 GBUnloadROM(gb);
359
360 if (gb->biosVf) {
361 gb->biosVf->close(gb->biosVf);
362 gb->biosVf = 0;
363 }
364
365 GBMemoryDeinit(gb);
366 GBAudioDeinit(&gb->audio);
367 GBVideoDeinit(&gb->video);
368 GBSIODeinit(&gb->sio);
369 mCoreCallbacksListDeinit(&gb->coreCallbacks);
370}
371
372void GBInterruptHandlerInit(struct LR35902InterruptHandler* irqh) {
373 irqh->reset = GBReset;
374 irqh->processEvents = GBProcessEvents;
375 irqh->setInterrupts = GBSetInterrupts;
376 irqh->irqVector = GBIRQVector;
377 irqh->hitIllegal = GBIllegal;
378 irqh->stop = GBStop;
379 irqh->halt = GBHalt;
380}
381
382static uint32_t _GBBiosCRC32(struct VFile* vf) {
383 ssize_t size = vf->size(vf);
384 if (size <= 0 || size > GB_SIZE_CART_BANK0) {
385 return 0;
386 }
387 void* bios = vf->map(vf, size, MAP_READ);
388 uint32_t biosCrc = doCrc32(bios, size);
389 vf->unmap(vf, bios, size);
390 return biosCrc;
391}
392
393bool GBIsBIOS(struct VFile* vf) {
394 switch (_GBBiosCRC32(vf)) {
395 case DMG_BIOS_CHECKSUM:
396 case DMG_2_BIOS_CHECKSUM:
397 case MGB_BIOS_CHECKSUM:
398 case SGB_BIOS_CHECKSUM:
399 case CGB_BIOS_CHECKSUM:
400 return true;
401 default:
402 return false;
403 }
404}
405
406void GBReset(struct LR35902Core* cpu) {
407 struct GB* gb = (struct GB*) cpu->master;
408 gb->memory.romBase = gb->memory.rom;
409 GBDetectModel(gb);
410
411 if (gb->biosVf) {
412 if (!GBIsBIOS(gb->biosVf)) {
413 gb->biosVf->close(gb->biosVf);
414 gb->biosVf = NULL;
415 } else {
416 gb->biosVf->seek(gb->biosVf, 0, SEEK_SET);
417 gb->memory.romBase = malloc(GB_SIZE_CART_BANK0);
418 ssize_t size = gb->biosVf->read(gb->biosVf, gb->memory.romBase, GB_SIZE_CART_BANK0);
419 memcpy(&gb->memory.romBase[size], &gb->memory.rom[size], GB_SIZE_CART_BANK0 - size);
420 if (size > 0x100) {
421 memcpy(&gb->memory.romBase[0x100], &gb->memory.rom[0x100], sizeof(struct GBCartridge));
422 }
423
424 cpu->a = 0;
425 cpu->f.packed = 0;
426 cpu->c = 0;
427 cpu->e = 0;
428 cpu->h = 0;
429 cpu->l = 0;
430 cpu->sp = 0;
431 cpu->pc = 0;
432 }
433 }
434
435 cpu->b = 0;
436 cpu->d = 0;
437
438 gb->timer.internalDiv = 0;
439
440 gb->cpuBlocked = false;
441 gb->earlyExit = false;
442 gb->doubleSpeed = 0;
443
444 if (gb->yankedRomSize) {
445 gb->memory.romSize = gb->yankedRomSize;
446 gb->yankedRomSize = 0;
447 }
448
449 gb->sgbBit = -1;
450 gb->sgbControllers = 0;
451 gb->sgbCurrentController = 0;
452 gb->currentSgbBits = 0;
453 memset(gb->sgbPacket, 0, sizeof(gb->sgbPacket));
454
455 mTimingClear(&gb->timing);
456
457 GBMemoryReset(gb);
458 GBVideoReset(&gb->video);
459 GBTimerReset(&gb->timer);
460 if (!gb->biosVf) {
461 GBSkipBIOS(gb);
462 } else {
463 mTimingSchedule(&gb->timing, &gb->timer.event, 0);
464 }
465
466 GBIOReset(gb);
467 GBAudioReset(&gb->audio);
468 GBSIOReset(&gb->sio);
469
470 cpu->memory.setActiveRegion(cpu, cpu->pc);
471
472 gb->sramMaskWriteback = false;
473 GBSavedataUnmask(gb);
474}
475
476void GBSkipBIOS(struct GB* gb) {
477 struct LR35902Core* cpu = gb->cpu;
478 int nextDiv = 0;
479
480 switch (gb->model) {
481 case GB_MODEL_AUTODETECT: // Silence warnings
482 gb->model = GB_MODEL_DMG;
483 // Fall through
484 case GB_MODEL_DMG:
485 cpu->a = 1;
486 cpu->f.packed = 0xB0;
487 cpu->c = 0x13;
488 cpu->e = 0xD8;
489 cpu->h = 1;
490 cpu->l = 0x4D;
491 gb->timer.internalDiv = 0xABC;
492 nextDiv = 4;
493 break;
494 case GB_MODEL_SGB:
495 cpu->a = 1;
496 cpu->f.packed = 0x00;
497 cpu->c = 0x14;
498 cpu->e = 0x00;
499 cpu->h = 0xC0;
500 cpu->l = 0x60;
501 gb->timer.internalDiv = 0xABC;
502 nextDiv = 4;
503 break;
504 case GB_MODEL_MGB:
505 cpu->a = 0xFF;
506 cpu->f.packed = 0xB0;
507 cpu->c = 0x13;
508 cpu->e = 0xD8;
509 cpu->h = 1;
510 cpu->l = 0x4D;
511 gb->timer.internalDiv = 0xABC;
512 nextDiv = 4;
513 break;
514 case GB_MODEL_SGB2:
515 cpu->a = 0xFF;
516 cpu->f.packed = 0x00;
517 cpu->c = 0x14;
518 cpu->e = 0x00;
519 cpu->h = 0xC0;
520 cpu->l = 0x60;
521 gb->timer.internalDiv = 0xABC;
522 nextDiv = 4;
523 break;
524 case GB_MODEL_AGB:
525 cpu->a = 0x11;
526 cpu->b = 1;
527 cpu->f.packed = 0x00;
528 cpu->c = 0;
529 cpu->e = 0x08;
530 cpu->h = 0;
531 cpu->l = 0x7C;
532 gb->timer.internalDiv = 0x1EA;
533 nextDiv = 0xC;
534 break;
535 case GB_MODEL_CGB:
536 cpu->a = 0x11;
537 cpu->f.packed = 0x80;
538 cpu->c = 0;
539 cpu->e = 0x08;
540 cpu->h = 0;
541 cpu->l = 0x7C;
542 gb->timer.internalDiv = 0x1EA;
543 nextDiv = 0xC;
544 break;
545 }
546
547 cpu->sp = 0xFFFE;
548 cpu->pc = 0x100;
549
550 mTimingDeschedule(&gb->timing, &gb->timer.event);
551 mTimingSchedule(&gb->timing, &gb->timer.event, 0);
552
553 GBIOWrite(gb, REG_LCDC, 0x91);
554
555 if (gb->biosVf) {
556 GBUnmapBIOS(gb);
557 }
558}
559
560void GBUnmapBIOS(struct GB* gb) {
561 if (gb->memory.romBase < gb->memory.rom || gb->memory.romBase > &gb->memory.rom[gb->memory.romSize - 1]) {
562 free(gb->memory.romBase);
563 gb->memory.romBase = gb->memory.rom;
564 }
565 // XXX: Force AGB registers for AGB-mode
566 if (gb->model == GB_MODEL_AGB && gb->cpu->pc == 0x100) {
567 gb->cpu->b = 1;
568 }
569}
570
571void GBDetectModel(struct GB* gb) {
572 if (gb->model != GB_MODEL_AUTODETECT) {
573 return;
574 }
575 if (gb->biosVf) {
576 switch (_GBBiosCRC32(gb->biosVf)) {
577 case DMG_BIOS_CHECKSUM:
578 case DMG_2_BIOS_CHECKSUM:
579 gb->model = GB_MODEL_DMG;
580 break;
581 case MGB_BIOS_CHECKSUM:
582 gb->model = GB_MODEL_MGB;
583 break;
584 case SGB_BIOS_CHECKSUM:
585 gb->model = GB_MODEL_SGB;
586 break;
587 case CGB_BIOS_CHECKSUM:
588 gb->model = GB_MODEL_CGB;
589 break;
590 default:
591 gb->biosVf->close(gb->biosVf);
592 gb->biosVf = NULL;
593 }
594 }
595 if (gb->model == GB_MODEL_AUTODETECT && gb->memory.rom) {
596 const struct GBCartridge* cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
597 if (cart->cgb & 0x80) {
598 gb->model = GB_MODEL_CGB;
599 } else if (cart->sgb == 0x03 && cart->oldLicensee == 0x33) {
600 gb->model = GB_MODEL_SGB;
601 } else {
602 gb->model = GB_MODEL_DMG;
603 }
604 }
605
606 switch (gb->model) {
607 case GB_MODEL_DMG:
608 case GB_MODEL_SGB:
609 case GB_MODEL_AUTODETECT: //Silence warnings
610 gb->audio.style = GB_AUDIO_DMG;
611 break;
612 case GB_MODEL_MGB:
613 case GB_MODEL_SGB2:
614 gb->audio.style = GB_AUDIO_MGB;
615 break;
616 case GB_MODEL_AGB:
617 case GB_MODEL_CGB:
618 gb->audio.style = GB_AUDIO_CGB;
619 break;
620 }
621}
622
623void GBUpdateIRQs(struct GB* gb) {
624 int irqs = gb->memory.ie & gb->memory.io[REG_IF];
625 if (!irqs) {
626 gb->cpu->irqPending = false;
627 return;
628 }
629 gb->cpu->halted = false;
630
631 if (!gb->memory.ime) {
632 gb->cpu->irqPending = false;
633 return;
634 }
635 if (gb->cpu->irqPending) {
636 return;
637 }
638 LR35902RaiseIRQ(gb->cpu);
639}
640
641void GBProcessEvents(struct LR35902Core* cpu) {
642 struct GB* gb = (struct GB*) cpu->master;
643 do {
644 int32_t cycles = cpu->cycles;
645 int32_t nextEvent;
646
647 cpu->cycles = 0;
648 cpu->nextEvent = INT_MAX;
649
650 nextEvent = cycles;
651 do {
652 nextEvent = mTimingTick(&gb->timing, nextEvent);
653 } while (gb->cpuBlocked);
654 cpu->nextEvent = nextEvent;
655
656 if (cpu->halted) {
657 cpu->cycles = cpu->nextEvent;
658 if (!gb->memory.ie || !gb->memory.ime) {
659 break;
660 }
661 }
662 if (gb->earlyExit) {
663 break;
664 }
665 } while (cpu->cycles >= cpu->nextEvent);
666 gb->earlyExit = false;
667}
668
669void GBSetInterrupts(struct LR35902Core* cpu, bool enable) {
670 struct GB* gb = (struct GB*) cpu->master;
671 mTimingDeschedule(&gb->timing, &gb->eiPending);
672 if (!enable) {
673 gb->memory.ime = false;
674 GBUpdateIRQs(gb);
675 } else {
676 mTimingSchedule(&gb->timing, &gb->eiPending, 4);
677 }
678}
679
680uint16_t GBIRQVector(struct LR35902Core* cpu) {
681 struct GB* gb = (struct GB*) cpu->master;
682 int irqs = gb->memory.ie & gb->memory.io[REG_IF];
683
684 if (irqs & (1 << GB_IRQ_VBLANK)) {
685 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_VBLANK);
686 return GB_VECTOR_VBLANK;
687 }
688 if (irqs & (1 << GB_IRQ_LCDSTAT)) {
689 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_LCDSTAT);
690 return GB_VECTOR_LCDSTAT;
691 }
692 if (irqs & (1 << GB_IRQ_TIMER)) {
693 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_TIMER);
694 return GB_VECTOR_TIMER;
695 }
696 if (irqs & (1 << GB_IRQ_SIO)) {
697 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_SIO);
698 return GB_VECTOR_SIO;
699 }
700 if (irqs & (1 << GB_IRQ_KEYPAD)) {
701 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_KEYPAD);
702 return GB_VECTOR_KEYPAD;
703 }
704 return 0;
705}
706
707static void _enableInterrupts(struct mTiming* timing, void* user, uint32_t cyclesLate) {
708 UNUSED(timing);
709 UNUSED(cyclesLate);
710 struct GB* gb = user;
711 gb->memory.ime = true;
712 GBUpdateIRQs(gb);
713}
714
715void GBHalt(struct LR35902Core* cpu) {
716 struct GB* gb = (struct GB*) cpu->master;
717 if (!(gb->memory.ie & gb->memory.io[REG_IF])) {
718 cpu->cycles = cpu->nextEvent;
719 cpu->halted = true;
720 } else if (gb->model < GB_MODEL_CGB) {
721 mLOG(GB, STUB, "Unimplemented HALT bug");
722 }
723}
724
725void GBStop(struct LR35902Core* cpu) {
726 struct GB* gb = (struct GB*) cpu->master;
727 if (cpu->bus) {
728 mLOG(GB, GAME_ERROR, "Hit illegal stop at address %04X:%02X", cpu->pc, cpu->bus);
729 }
730 if (gb->memory.io[REG_KEY1] & 1) {
731 gb->doubleSpeed ^= 1;
732 gb->audio.timingFactor = gb->doubleSpeed + 1;
733 gb->memory.io[REG_KEY1] = 0;
734 gb->memory.io[REG_KEY1] |= gb->doubleSpeed << 7;
735 } else if (cpu->bus) {
736#ifdef USE_DEBUGGERS
737 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
738 struct mDebuggerEntryInfo info = {
739 .address = cpu->pc - 1,
740 .type.bp.opcode = 0x1000 | cpu->bus
741 };
742 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
743 }
744#endif
745 // Hang forever
746 gb->memory.ime = 0;
747 cpu->pc -= 2;
748 }
749 // TODO: Actually stop
750}
751
752void GBIllegal(struct LR35902Core* cpu) {
753 struct GB* gb = (struct GB*) cpu->master;
754 mLOG(GB, GAME_ERROR, "Hit illegal opcode at address %04X:%02X", cpu->pc, cpu->bus);
755#ifdef USE_DEBUGGERS
756 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
757 struct mDebuggerEntryInfo info = {
758 .address = cpu->pc,
759 .type.bp.opcode = cpu->bus
760 };
761 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
762 }
763#endif
764 // Hang forever
765 gb->memory.ime = 0;
766 --cpu->pc;
767}
768
769bool GBIsROM(struct VFile* vf) {
770 if (!vf) {
771 return false;
772 }
773 vf->seek(vf, 0x104, SEEK_SET);
774 uint8_t header[4];
775
776 if (vf->read(vf, &header, sizeof(header)) < (ssize_t) sizeof(header)) {
777 return false;
778 }
779 if (memcmp(header, _knownHeader, sizeof(header))) {
780 return false;
781 }
782 return true;
783}
784
785void GBGetGameTitle(const struct GB* gb, char* out) {
786 const struct GBCartridge* cart = NULL;
787 if (gb->memory.rom) {
788 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
789 }
790 if (!cart) {
791 return;
792 }
793 if (cart->oldLicensee != 0x33) {
794 memcpy(out, cart->titleLong, 16);
795 } else {
796 memcpy(out, cart->titleShort, 11);
797 }
798}
799
800void GBGetGameCode(const struct GB* gb, char* out) {
801 memset(out, 0, 8);
802 const struct GBCartridge* cart = NULL;
803 if (gb->memory.rom) {
804 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
805 }
806 if (!cart) {
807 return;
808 }
809 if (cart->cgb == 0xC0) {
810 memcpy(out, "CGB-????", 8);
811 } else {
812 memcpy(out, "DMG-????", 8);
813 }
814 if (cart->oldLicensee == 0x33) {
815 memcpy(&out[4], cart->maker, 4);
816 }
817}
818
819void GBFrameStarted(struct GB* gb) {
820 GBTestKeypadIRQ(gb);
821
822 size_t c;
823 for (c = 0; c < mCoreCallbacksListSize(&gb->coreCallbacks); ++c) {
824 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gb->coreCallbacks, c);
825 if (callbacks->videoFrameStarted) {
826 callbacks->videoFrameStarted(callbacks->context);
827 }
828 }
829}
830
831void GBFrameEnded(struct GB* gb) {
832 GBSramClean(gb, gb->video.frameCounter);
833
834 if (gb->cpu->components && gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
835 struct mCheatDevice* device = (struct mCheatDevice*) gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
836 size_t i;
837 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
838 struct mCheatSet* cheats = *mCheatSetsGetPointer(&device->cheats, i);
839 mCheatRefresh(device, cheats);
840 }
841 }
842
843 // TODO: Move to common code
844 if (gb->stream && gb->stream->postVideoFrame) {
845 const color_t* pixels;
846 size_t stride;
847 gb->video.renderer->getPixels(gb->video.renderer, &stride, (const void**) &pixels);
848 gb->stream->postVideoFrame(gb->stream, pixels, stride);
849 }
850
851 size_t c;
852 for (c = 0; c < mCoreCallbacksListSize(&gb->coreCallbacks); ++c) {
853 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gb->coreCallbacks, c);
854 if (callbacks->videoFrameEnded) {
855 callbacks->videoFrameEnded(callbacks->context);
856 }
857 }
858}
859
860enum GBModel GBNameToModel(const char* model) {
861 if (strcasecmp(model, "DMG") == 0) {
862 return GB_MODEL_DMG;
863 } else if (strcasecmp(model, "CGB") == 0) {
864 return GB_MODEL_CGB;
865 } else if (strcasecmp(model, "AGB") == 0) {
866 return GB_MODEL_AGB;
867 } else if (strcasecmp(model, "SGB") == 0) {
868 return GB_MODEL_SGB;
869 } else if (strcasecmp(model, "MGB") == 0) {
870 return GB_MODEL_MGB;
871 } else if (strcasecmp(model, "SGB2") == 0) {
872 return GB_MODEL_SGB2;
873 }
874 return GB_MODEL_AUTODETECT;
875}
876
877const char* GBModelToName(enum GBModel model) {
878 switch (model) {
879 case GB_MODEL_DMG:
880 return "DMG";
881 case GB_MODEL_SGB:
882 return "SGB";
883 case GB_MODEL_MGB:
884 return "MGB";
885 case GB_MODEL_SGB2:
886 return "SGB2";
887 case GB_MODEL_CGB:
888 return "CGB";
889 case GB_MODEL_AGB:
890 return "AGB";
891 default:
892 case GB_MODEL_AUTODETECT:
893 return NULL;
894 }
895}