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 "gb.h"
7
8#include "gb/io.h"
9#include "gb/mbc.h"
10
11#include "core/core.h"
12#include "core/cheats.h"
13#include "util/crc32.h"
14#include "util/memory.h"
15#include "util/math.h"
16#include "util/patch.h"
17#include "util/vfs.h"
18
19#define CLEANUP_THRESHOLD 15
20
21const uint32_t CGB_LR35902_FREQUENCY = 0x800000;
22const uint32_t SGB_LR35902_FREQUENCY = 0x418B1E;
23
24const uint32_t GB_COMPONENT_MAGIC = 0x400000;
25
26static const uint8_t _knownHeader[4] = { 0xCE, 0xED, 0x66, 0x66};
27
28#define DMG_BIOS_CHECKSUM 0xC2F5CC97
29#define DMG_2_BIOS_CHECKSUM 0x59C8598E
30#define CGB_BIOS_CHECKSUM 0x41884E46
31
32mLOG_DEFINE_CATEGORY(GB, "GB");
33
34static void GBInit(void* cpu, struct mCPUComponent* component);
35static void GBDeinit(struct mCPUComponent* component);
36static void GBInterruptHandlerInit(struct LR35902InterruptHandler* irqh);
37static void GBProcessEvents(struct LR35902Core* cpu);
38static void GBSetInterrupts(struct LR35902Core* cpu, bool enable);
39static void GBIllegal(struct LR35902Core* cpu);
40static void GBStop(struct LR35902Core* cpu);
41
42static void _enableInterrupts(struct mTiming* timing, void* user, uint32_t cyclesLate);
43
44#ifdef _3DS
45extern uint32_t* romBuffer;
46extern size_t romBufferSize;
47#endif
48
49void GBCreate(struct GB* gb) {
50 gb->d.id = GB_COMPONENT_MAGIC;
51 gb->d.init = GBInit;
52 gb->d.deinit = GBDeinit;
53}
54
55static void GBInit(void* cpu, struct mCPUComponent* component) {
56 struct GB* gb = (struct GB*) component;
57 gb->cpu = cpu;
58 gb->sync = NULL;
59
60 GBInterruptHandlerInit(&gb->cpu->irqh);
61 GBMemoryInit(gb);
62
63 gb->video.p = gb;
64 GBVideoInit(&gb->video);
65
66 gb->audio.p = gb;
67 GBAudioInit(&gb->audio, 2048, &gb->memory.io[REG_NR52], GB_AUDIO_DMG); // TODO: Remove magic constant
68
69 gb->sio.p = gb;
70 GBSIOInit(&gb->sio);
71
72 gb->timer.p = gb;
73
74 gb->model = GB_MODEL_AUTODETECT;
75
76 gb->biosVf = NULL;
77 gb->romVf = NULL;
78 gb->sramVf = NULL;
79 gb->sramRealVf = NULL;
80
81 gb->pristineRom = 0;
82 gb->pristineRomSize = 0;
83 gb->yankedRomSize = 0;
84
85 gb->coreCallbacks = NULL;
86 gb->stream = NULL;
87
88 mTimingInit(&gb->timing, &gb->cpu->cycles, &gb->cpu->nextEvent);
89 gb->audio.timing = &gb->timing;
90
91 gb->eiPending.name = "GB EI";
92 gb->eiPending.callback = _enableInterrupts;
93 gb->eiPending.context = gb;
94}
95
96static void GBDeinit(struct mCPUComponent* component) {
97 struct GB* gb = (struct GB*) component;
98 mTimingDeinit(&gb->timing);
99}
100
101bool GBLoadROM(struct GB* gb, struct VFile* vf) {
102 if (!vf) {
103 return false;
104 }
105 GBUnloadROM(gb);
106 gb->romVf = vf;
107 gb->pristineRomSize = vf->size(vf);
108 vf->seek(vf, 0, SEEK_SET);
109#ifdef _3DS
110 gb->pristineRom = 0;
111 if (gb->pristineRomSize <= romBufferSize) {
112 gb->pristineRom = romBuffer;
113 vf->read(vf, romBuffer, gb->pristineRomSize);
114 }
115#else
116 gb->pristineRom = vf->map(vf, gb->pristineRomSize, MAP_READ);
117#endif
118 if (!gb->pristineRom) {
119 return false;
120 }
121 gb->yankedRomSize = 0;
122 gb->memory.rom = gb->pristineRom;
123 gb->memory.romBase = gb->memory.rom;
124 gb->memory.romSize = gb->pristineRomSize;
125 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
126 GBMBCSwitchBank(&gb->memory, gb->memory.currentBank);
127
128 if (gb->cpu) {
129 struct LR35902Core* cpu = gb->cpu;
130 cpu->memory.setActiveRegion(cpu, cpu->pc);
131 }
132
133 // TODO: error check
134 return true;
135}
136
137bool GBLoadSave(struct GB* gb, struct VFile* vf) {
138 gb->sramVf = vf;
139 gb->sramRealVf = vf;
140 return vf;
141}
142
143static void GBSramDeinit(struct GB* gb) {
144 if (gb->sramVf) {
145 gb->sramVf->unmap(gb->sramVf, gb->memory.sram, gb->sramSize);
146 if (gb->memory.mbcType == GB_MBC3_RTC && gb->sramVf == gb->sramRealVf) {
147 GBMBCRTCWrite(gb);
148 }
149 gb->sramVf = NULL;
150 } else if (gb->memory.sram) {
151 mappedMemoryFree(gb->memory.sram, gb->sramSize);
152 }
153 gb->memory.sram = 0;
154}
155
156void GBResizeSram(struct GB* gb, size_t size) {
157 if (gb->memory.sram && size <= gb->sramSize) {
158 return;
159 }
160 mLOG(GB, INFO, "Resizing SRAM to %"PRIz"u bytes", size);
161 struct VFile* vf = gb->sramVf;
162 if (vf) {
163 if (vf == gb->sramRealVf) {
164 ssize_t vfSize = vf->size(vf);
165 if (vfSize >= 0 && (size_t) vfSize < size) {
166 uint8_t extdataBuffer[0x100];
167 if (vfSize & 0xFF) {
168 vf->seek(vf, -(vfSize & 0xFF), SEEK_END);
169 vf->read(vf, extdataBuffer, vfSize & 0xFF);
170 }
171 if (gb->memory.sram) {
172 vf->unmap(vf, gb->memory.sram, gb->sramSize);
173 }
174 vf->truncate(vf, size + (vfSize & 0xFF));
175 if (vfSize & 0xFF) {
176 vf->seek(vf, size, SEEK_SET);
177 vf->write(vf, extdataBuffer, vfSize & 0xFF);
178 }
179 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
180 memset(&gb->memory.sram[gb->sramSize], 0xFF, size - gb->sramSize);
181 } else if (size > gb->sramSize || !gb->memory.sram) {
182 if (gb->memory.sram) {
183 vf->unmap(vf, gb->memory.sram, gb->sramSize);
184 }
185 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
186 }
187 } else {
188 if (gb->memory.sram) {
189 vf->unmap(vf, gb->memory.sram, gb->sramSize);
190 }
191 gb->memory.sram = vf->map(vf, size, MAP_READ);
192 }
193 if (gb->memory.sram == (void*) -1) {
194 gb->memory.sram = NULL;
195 }
196 } else {
197 uint8_t* newSram = anonymousMemoryMap(size);
198 if (gb->memory.sram) {
199 if (size > gb->sramSize) {
200 memcpy(newSram, gb->memory.sram, gb->sramSize);
201 memset(&newSram[gb->sramSize], 0xFF, size - gb->sramSize);
202 } else {
203 memcpy(newSram, gb->memory.sram, size);
204 }
205 mappedMemoryFree(gb->memory.sram, gb->sramSize);
206 } else {
207 memset(newSram, 0xFF, size);
208 }
209 gb->memory.sram = newSram;
210 }
211 if (gb->sramSize < size) {
212 gb->sramSize = size;
213 }
214}
215
216void GBSramClean(struct GB* gb, uint32_t frameCount) {
217 // TODO: Share with GBASavedataClean
218 if (!gb->sramVf || gb->sramVf != gb->sramRealVf) {
219 return;
220 }
221 if (gb->sramDirty & GB_SRAM_DIRT_NEW) {
222 gb->sramDirtAge = frameCount;
223 gb->sramDirty &= ~GB_SRAM_DIRT_NEW;
224 if (!(gb->sramDirty & GB_SRAM_DIRT_SEEN)) {
225 gb->sramDirty |= GB_SRAM_DIRT_SEEN;
226 }
227 } else if ((gb->sramDirty & GB_SRAM_DIRT_SEEN) && frameCount - gb->sramDirtAge > CLEANUP_THRESHOLD) {
228 if (gb->memory.mbcType == GB_MBC3_RTC) {
229 GBMBCRTCWrite(gb);
230 }
231 gb->sramDirty = 0;
232 if (gb->memory.sram && gb->sramVf->sync(gb->sramVf, gb->memory.sram, gb->sramSize)) {
233 mLOG(GB_MEM, INFO, "Savedata synced");
234 } else {
235 mLOG(GB_MEM, INFO, "Savedata failed to sync!");
236 }
237 }
238}
239
240void GBSavedataMask(struct GB* gb, struct VFile* vf, bool writeback) {
241 GBSramDeinit(gb);
242 gb->sramVf = vf;
243 gb->sramMaskWriteback = writeback;
244 gb->memory.sram = vf->map(vf, gb->sramSize, MAP_READ);
245 GBMBCSwitchSramBank(gb, gb->memory.sramCurrentBank);
246}
247
248void GBSavedataUnmask(struct GB* gb) {
249 if (gb->sramVf == gb->sramRealVf) {
250 return;
251 }
252 struct VFile* vf = gb->sramVf;
253 GBSramDeinit(gb);
254 gb->sramVf = gb->sramRealVf;
255 gb->memory.sram = gb->sramVf->map(gb->sramVf, gb->sramSize, MAP_WRITE);
256 if (gb->sramMaskWriteback) {
257 vf->read(vf, gb->memory.sram, gb->sramSize);
258 }
259 vf->close(vf);
260}
261
262void GBUnloadROM(struct GB* gb) {
263 // TODO: Share with GBAUnloadROM
264 if (gb->memory.rom && gb->memory.romBase != gb->memory.rom && gb->memory.romBase != gb->pristineRom) {
265 free(gb->memory.romBase);
266 }
267 if (gb->memory.rom && gb->pristineRom != gb->memory.rom) {
268 if (gb->yankedRomSize) {
269 gb->yankedRomSize = 0;
270 }
271 mappedMemoryFree(gb->memory.rom, GB_SIZE_CART_MAX);
272 gb->memory.rom = gb->pristineRom;
273 }
274 gb->memory.rom = 0;
275
276 if (gb->romVf) {
277#ifndef _3DS
278 gb->romVf->unmap(gb->romVf, gb->pristineRom, gb->pristineRomSize);
279#endif
280 gb->romVf->close(gb->romVf);
281 gb->romVf = 0;
282 }
283 gb->pristineRom = 0;
284
285 GBSavedataUnmask(gb);
286 GBSramDeinit(gb);
287 if (gb->sramRealVf) {
288 gb->sramRealVf->close(gb->sramRealVf);
289 }
290 gb->sramRealVf = NULL;
291 gb->sramVf = NULL;
292}
293
294void GBSynthesizeROM(struct VFile* vf) {
295 if (!vf) {
296 return;
297 }
298 const struct GBCartridge cart = {
299 .logo = { _knownHeader[0], _knownHeader[1], _knownHeader[2], _knownHeader[3]}
300 };
301
302 vf->seek(vf, 0x100, SEEK_SET);
303 vf->write(vf, &cart, sizeof(cart));
304}
305
306void GBLoadBIOS(struct GB* gb, struct VFile* vf) {
307 gb->biosVf = vf;
308}
309
310void GBApplyPatch(struct GB* gb, struct Patch* patch) {
311 size_t patchedSize = patch->outputSize(patch, gb->memory.romSize);
312 if (!patchedSize) {
313 return;
314 }
315 if (patchedSize > GB_SIZE_CART_MAX) {
316 patchedSize = GB_SIZE_CART_MAX;
317 }
318 gb->memory.rom = anonymousMemoryMap(GB_SIZE_CART_MAX);
319 if (!patch->applyPatch(patch, gb->pristineRom, gb->pristineRomSize, gb->memory.rom, patchedSize)) {
320 mappedMemoryFree(gb->memory.rom, patchedSize);
321 gb->memory.rom = gb->pristineRom;
322 return;
323 }
324 gb->memory.romSize = patchedSize;
325 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
326}
327
328void GBDestroy(struct GB* gb) {
329 GBUnloadROM(gb);
330
331 if (gb->biosVf) {
332 gb->biosVf->close(gb->biosVf);
333 gb->biosVf = 0;
334 }
335
336 GBMemoryDeinit(gb);
337 GBAudioDeinit(&gb->audio);
338 GBVideoDeinit(&gb->video);
339 GBSIODeinit(&gb->sio);
340}
341
342void GBInterruptHandlerInit(struct LR35902InterruptHandler* irqh) {
343 irqh->reset = GBReset;
344 irqh->processEvents = GBProcessEvents;
345 irqh->setInterrupts = GBSetInterrupts;
346 irqh->hitIllegal = GBIllegal;
347 irqh->stop = GBStop;
348 irqh->halt = GBHalt;
349}
350
351static uint32_t _GBBiosCRC32(struct VFile* vf) {
352 ssize_t size = vf->size(vf);
353 if (size <= 0 || size > GB_SIZE_CART_BANK0) {
354 return 0;
355 }
356 void* bios = vf->map(vf, size, MAP_READ);
357 uint32_t biosCrc = doCrc32(bios, size);
358 vf->unmap(vf, bios, size);
359 return biosCrc;
360}
361
362bool GBIsBIOS(struct VFile* vf) {
363 switch (_GBBiosCRC32(vf)) {
364 case DMG_BIOS_CHECKSUM:
365 case DMG_2_BIOS_CHECKSUM:
366 case CGB_BIOS_CHECKSUM:
367 return true;
368 default:
369 return false;
370 }
371}
372
373void GBReset(struct LR35902Core* cpu) {
374 struct GB* gb = (struct GB*) cpu->master;
375 GBDetectModel(gb);
376 if (gb->biosVf) {
377 if (!GBIsBIOS(gb->biosVf)) {
378 gb->biosVf->close(gb->biosVf);
379 gb->biosVf = NULL;
380 } else {
381 gb->biosVf->seek(gb->biosVf, 0, SEEK_SET);
382 gb->memory.romBase = malloc(GB_SIZE_CART_BANK0);
383 ssize_t size = gb->biosVf->read(gb->biosVf, gb->memory.romBase, GB_SIZE_CART_BANK0);
384 memcpy(&gb->memory.romBase[size], &gb->memory.rom[size], GB_SIZE_CART_BANK0 - size);
385 if (size > 0x100) {
386 memcpy(&gb->memory.romBase[0x100], &gb->memory.rom[0x100], sizeof(struct GBCartridge));
387 }
388
389 cpu->a = 0;
390 cpu->f.packed = 0;
391 cpu->c = 0;
392 cpu->e = 0;
393 cpu->h = 0;
394 cpu->l = 0;
395 cpu->sp = 0;
396 cpu->pc = 0;
397 }
398 }
399
400 cpu->b = 0;
401 cpu->d = 0;
402
403 if (!gb->biosVf) {
404 switch (gb->model) {
405 case GB_MODEL_DMG:
406 // TODO: SGB
407 case GB_MODEL_SGB:
408 case GB_MODEL_AUTODETECT: // Silence warnings
409 gb->model = GB_MODEL_DMG;
410 cpu->a = 1;
411 cpu->f.packed = 0xB0;
412 cpu->c = 0x13;
413 cpu->e = 0xD8;
414 cpu->h = 1;
415 cpu->l = 0x4D;
416 break;
417 case GB_MODEL_AGB:
418 cpu->b = 1;
419 // Fall through
420 case GB_MODEL_CGB:
421 cpu->a = 0x11;
422 cpu->f.packed = 0x80;
423 cpu->c = 0;
424 cpu->e = 0x08;
425 cpu->h = 0;
426 cpu->l = 0x7C;
427 break;
428 }
429
430 cpu->sp = 0xFFFE;
431 cpu->pc = 0x100;
432 }
433
434 gb->cpuBlocked = false;
435 gb->doubleSpeed = 0;
436
437 cpu->memory.setActiveRegion(cpu, cpu->pc);
438
439 if (gb->yankedRomSize) {
440 gb->memory.romSize = gb->yankedRomSize;
441 gb->yankedRomSize = 0;
442 }
443
444 mTimingClear(&gb->timing);
445
446 GBMemoryReset(gb);
447 GBVideoReset(&gb->video);
448 GBTimerReset(&gb->timer);
449 mTimingSchedule(&gb->timing, &gb->timer.event, GB_DMG_DIV_PERIOD);
450
451 GBAudioReset(&gb->audio);
452 GBIOReset(gb);
453 GBSIOReset(&gb->sio);
454
455 GBSavedataUnmask(gb);
456}
457
458void GBDetectModel(struct GB* gb) {
459 if (gb->model != GB_MODEL_AUTODETECT) {
460 return;
461 }
462 if (gb->biosVf) {
463 switch (_GBBiosCRC32(gb->biosVf)) {
464 case DMG_BIOS_CHECKSUM:
465 case DMG_2_BIOS_CHECKSUM:
466 gb->model = GB_MODEL_DMG;
467 break;
468 case CGB_BIOS_CHECKSUM:
469 gb->model = GB_MODEL_CGB;
470 break;
471 default:
472 gb->biosVf->close(gb->biosVf);
473 gb->biosVf = NULL;
474 }
475 }
476 if (gb->model == GB_MODEL_AUTODETECT && gb->memory.rom) {
477 const struct GBCartridge* cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
478 if (cart->cgb & 0x80) {
479 gb->model = GB_MODEL_CGB;
480 } else {
481 gb->model = GB_MODEL_DMG;
482 }
483 }
484
485 switch (gb->model) {
486 case GB_MODEL_DMG:
487 case GB_MODEL_SGB:
488 case GB_MODEL_AUTODETECT: //Silence warnings
489 gb->audio.style = GB_AUDIO_DMG;
490 break;
491 case GB_MODEL_AGB:
492 case GB_MODEL_CGB:
493 gb->audio.style = GB_AUDIO_CGB;
494 break;
495 }
496}
497
498void GBUpdateIRQs(struct GB* gb) {
499 int irqs = gb->memory.ie & gb->memory.io[REG_IF];
500 if (!irqs) {
501 return;
502 }
503 gb->cpu->halted = false;
504
505 if (!gb->memory.ime || gb->cpu->irqPending) {
506 return;
507 }
508
509 if (irqs & (1 << GB_IRQ_VBLANK)) {
510 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_VBLANK);
511 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_VBLANK);
512 return;
513 }
514 if (irqs & (1 << GB_IRQ_LCDSTAT)) {
515 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_LCDSTAT);
516 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_LCDSTAT);
517 return;
518 }
519 if (irqs & (1 << GB_IRQ_TIMER)) {
520 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_TIMER);
521 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_TIMER);
522 return;
523 }
524 if (irqs & (1 << GB_IRQ_SIO)) {
525 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_SIO);
526 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_SIO);
527 return;
528 }
529 if (irqs & (1 << GB_IRQ_KEYPAD)) {
530 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_KEYPAD);
531 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_KEYPAD);
532 }
533}
534
535void GBProcessEvents(struct LR35902Core* cpu) {
536 struct GB* gb = (struct GB*) cpu->master;
537 do {
538 int32_t cycles = cpu->cycles;
539 int32_t nextEvent;
540
541 cpu->cycles = 0;
542 cpu->nextEvent = INT_MAX;
543
544 nextEvent = cycles;
545 do {
546 nextEvent = mTimingTick(&gb->timing, nextEvent);
547 } while (gb->cpuBlocked);
548 cpu->nextEvent = nextEvent;
549
550 if (cpu->halted) {
551 cpu->cycles = cpu->nextEvent;
552 if (!gb->memory.ie || !gb->memory.ime) {
553 break;
554 }
555 }
556 } while (cpu->cycles >= cpu->nextEvent);
557}
558
559void GBSetInterrupts(struct LR35902Core* cpu, bool enable) {
560 struct GB* gb = (struct GB*) cpu->master;
561 if (!enable) {
562 gb->memory.ime = enable;
563 mTimingDeschedule(&gb->timing, &gb->eiPending);
564 GBUpdateIRQs(gb);
565 } else {
566 mTimingDeschedule(&gb->timing, &gb->eiPending);
567 mTimingSchedule(&gb->timing, &gb->eiPending, 4);
568 }
569}
570
571static void _enableInterrupts(struct mTiming* timing, void* user, uint32_t cyclesLate) {
572 UNUSED(timing);
573 UNUSED(cyclesLate);
574 struct GB* gb = user;
575 gb->memory.ime = true;
576 GBUpdateIRQs(gb);
577}
578
579void GBHalt(struct LR35902Core* cpu) {
580 if (!cpu->irqPending) {
581 cpu->cycles = cpu->nextEvent;
582 cpu->halted = true;
583 }
584}
585
586void GBStop(struct LR35902Core* cpu) {
587 struct GB* gb = (struct GB*) cpu->master;
588 if (cpu->bus) {
589 mLOG(GB, GAME_ERROR, "Hit illegal stop at address %04X:%02X\n", cpu->pc, cpu->bus);
590 }
591 if (gb->memory.io[REG_KEY1] & 1) {
592 gb->doubleSpeed ^= 1;
593 gb->audio.timingFactor = gb->doubleSpeed + 1;
594 gb->memory.io[REG_KEY1] = 0;
595 gb->memory.io[REG_KEY1] |= gb->doubleSpeed << 7;
596 } else if (cpu->bus) {
597#ifdef USE_DEBUGGERS
598 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
599 struct mDebuggerEntryInfo info = {
600 .address = cpu->pc - 1,
601 .opcode = 0x1000 | cpu->bus
602 };
603 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
604 }
605#endif
606 // Hang forever
607 gb->memory.ime = 0;
608 cpu->pc -= 2;
609 }
610 // TODO: Actually stop
611}
612
613void GBIllegal(struct LR35902Core* cpu) {
614 struct GB* gb = (struct GB*) cpu->master;
615 mLOG(GB, GAME_ERROR, "Hit illegal opcode at address %04X:%02X\n", cpu->pc, cpu->bus);
616#ifdef USE_DEBUGGERS
617 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
618 struct mDebuggerEntryInfo info = {
619 .address = cpu->pc,
620 .opcode = cpu->bus
621 };
622 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
623 }
624#endif
625 // Hang forever
626 gb->memory.ime = 0;
627 --cpu->pc;
628}
629
630bool GBIsROM(struct VFile* vf) {
631 vf->seek(vf, 0x104, SEEK_SET);
632 uint8_t header[4];
633
634 if (vf->read(vf, &header, sizeof(header)) < (ssize_t) sizeof(header)) {
635 return false;
636 }
637 if (memcmp(header, _knownHeader, sizeof(header))) {
638 return false;
639 }
640 return true;
641}
642
643void GBGetGameTitle(const struct GB* gb, char* out) {
644 const struct GBCartridge* cart = NULL;
645 if (gb->memory.rom) {
646 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
647 }
648 if (gb->pristineRom) {
649 cart = (const struct GBCartridge*) &((uint8_t*) gb->pristineRom)[0x100];
650 }
651 if (!cart) {
652 return;
653 }
654 if (cart->oldLicensee != 0x33) {
655 memcpy(out, cart->titleLong, 16);
656 } else {
657 memcpy(out, cart->titleShort, 11);
658 }
659}
660
661void GBGetGameCode(const struct GB* gb, char* out) {
662 memset(out, 0, 8);
663 const struct GBCartridge* cart = NULL;
664 if (gb->memory.rom) {
665 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
666 }
667 if (gb->pristineRom) {
668 cart = (const struct GBCartridge*) &((uint8_t*) gb->pristineRom)[0x100];
669 }
670 if (!cart) {
671 return;
672 }
673 if (cart->cgb == 0xC0) {
674 memcpy(out, "CGB-????", 8);
675 } else {
676 memcpy(out, "DMG-????", 8);
677 }
678 if (cart->oldLicensee == 0x33) {
679 memcpy(&out[4], cart->maker, 4);
680 }
681}
682
683void GBFrameEnded(struct GB* gb) {
684 GBSramClean(gb, gb->video.frameCounter);
685
686 if (gb->cpu->components && gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
687 struct mCheatDevice* device = (struct mCheatDevice*) gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
688 size_t i;
689 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
690 struct mCheatSet* cheats = *mCheatSetsGetPointer(&device->cheats, i);
691 mCheatRefresh(device, cheats);
692 }
693 }
694}