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