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 GBInterruptHandlerInit(struct LR35902InterruptHandler* irqh);
36static void GBProcessEvents(struct LR35902Core* cpu);
37static void GBSetInterrupts(struct LR35902Core* cpu, bool enable);
38static void GBIllegal(struct LR35902Core* cpu);
39static void GBStop(struct LR35902Core* cpu);
40
41#ifdef _3DS
42extern uint32_t* romBuffer;
43extern size_t romBufferSize;
44#endif
45
46void GBCreate(struct GB* gb) {
47 gb->d.id = GB_COMPONENT_MAGIC;
48 gb->d.init = GBInit;
49 gb->d.deinit = 0;
50}
51
52static void GBInit(void* cpu, struct mCPUComponent* component) {
53 struct GB* gb = (struct GB*) component;
54 gb->cpu = cpu;
55 gb->sync = NULL;
56
57 GBInterruptHandlerInit(&gb->cpu->irqh);
58 GBMemoryInit(gb);
59
60 gb->video.p = gb;
61 GBVideoInit(&gb->video);
62
63 gb->audio.p = gb;
64 GBAudioInit(&gb->audio, 2048, &gb->memory.io[REG_NR52], GB_AUDIO_DMG); // TODO: Remove magic constant
65
66 gb->sio.p = gb;
67 GBSIOInit(&gb->sio);
68
69 gb->timer.p = gb;
70
71 gb->model = GB_MODEL_AUTODETECT;
72
73 gb->biosVf = 0;
74 gb->romVf = 0;
75 gb->sramVf = 0;
76
77 gb->pristineRom = 0;
78 gb->pristineRomSize = 0;
79 gb->yankedRomSize = 0;
80
81 gb->coreCallbacks = NULL;
82 gb->stream = NULL;
83}
84
85bool GBLoadROM(struct GB* gb, struct VFile* vf) {
86 if (!vf) {
87 return false;
88 }
89 GBUnloadROM(gb);
90 gb->romVf = vf;
91 gb->pristineRomSize = vf->size(vf);
92 vf->seek(vf, 0, SEEK_SET);
93#ifdef _3DS
94 gb->pristineRom = 0;
95 if (gb->pristineRomSize <= romBufferSize) {
96 gb->pristineRom = romBuffer;
97 vf->read(vf, romBuffer, gb->pristineRomSize);
98 }
99#else
100 gb->pristineRom = vf->map(vf, gb->pristineRomSize, MAP_READ);
101#endif
102 if (!gb->pristineRom) {
103 return false;
104 }
105 gb->yankedRomSize = 0;
106 gb->memory.rom = gb->pristineRom;
107 gb->memory.romBase = gb->memory.rom;
108 gb->memory.romSize = gb->pristineRomSize;
109 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
110
111 if (gb->cpu) {
112 struct LR35902Core* cpu = gb->cpu;
113 cpu->memory.setActiveRegion(cpu, cpu->pc);
114 }
115
116 // TODO: error check
117 return true;
118}
119
120bool GBLoadSave(struct GB* gb, struct VFile* vf) {
121 gb->sramVf = vf;
122 gb->sramRealVf = vf;
123 return vf;
124}
125
126static void GBSramDeinit(struct GB* gb) {
127 if (gb->sramVf) {
128 gb->sramVf->unmap(gb->sramVf, gb->memory.sram, gb->sramSize);
129 if (gb->memory.mbcType == GB_MBC3_RTC && gb->sramVf == gb->sramRealVf) {
130 GBMBCRTCWrite(gb);
131 }
132 gb->sramVf = NULL;
133 } else if (gb->memory.sram) {
134 mappedMemoryFree(gb->memory.sram, gb->sramSize);
135 }
136 gb->memory.sram = 0;
137}
138
139void GBResizeSram(struct GB* gb, size_t size) {
140 if (gb->memory.sram && size <= gb->sramSize) {
141 return;
142 }
143 mLOG(GB, INFO, "Resizing SRAM to %"PRIz"u bytes", size);
144 struct VFile* vf = gb->sramVf;
145 if (vf) {
146 if (vf == gb->sramRealVf) {
147 ssize_t vfSize = vf->size(vf);
148 if (vfSize >= 0 && (size_t) vfSize < size) {
149 uint8_t extdataBuffer[0x100];
150 if (vfSize & 0xFF) {
151 vf->seek(vf, -(vfSize & 0xFF), SEEK_END);
152 vf->read(vf, extdataBuffer, vfSize & 0xFF);
153 }
154 if (gb->memory.sram) {
155 vf->unmap(vf, gb->memory.sram, gb->sramSize);
156 }
157 vf->truncate(vf, size + (vfSize & 0xFF));
158 if (vfSize & 0xFF) {
159 vf->seek(vf, size, SEEK_SET);
160 vf->write(vf, extdataBuffer, vfSize & 0xFF);
161 }
162 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
163 memset(&gb->memory.sram[gb->sramSize], 0xFF, size - gb->sramSize);
164 } else if (size > gb->sramSize || !gb->memory.sram) {
165 if (gb->memory.sram) {
166 vf->unmap(vf, gb->memory.sram, gb->sramSize);
167 }
168 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
169 }
170 } else {
171 if (gb->memory.sram) {
172 vf->unmap(vf, gb->memory.sram, gb->sramSize);
173 }
174 gb->memory.sram = vf->map(vf, size, MAP_READ);
175 }
176 if (gb->memory.sram == (void*) -1) {
177 gb->memory.sram = NULL;
178 }
179 } else {
180 uint8_t* newSram = anonymousMemoryMap(size);
181 if (gb->memory.sram) {
182 if (size > gb->sramSize) {
183 memcpy(newSram, gb->memory.sram, gb->sramSize);
184 memset(&newSram[gb->sramSize], 0xFF, size - gb->sramSize);
185 } else {
186 memcpy(newSram, gb->memory.sram, size);
187 }
188 mappedMemoryFree(gb->memory.sram, gb->sramSize);
189 } else {
190 memset(newSram, 0xFF, size);
191 }
192 gb->memory.sram = newSram;
193 }
194 if (gb->sramSize < size) {
195 gb->sramSize = size;
196 }
197}
198
199void GBSramClean(struct GB* gb, uint32_t frameCount) {
200 // TODO: Share with GBASavedataClean
201 if (!gb->sramVf || gb->sramVf != gb->sramRealVf) {
202 return;
203 }
204 if (gb->sramDirty & GB_SRAM_DIRT_NEW) {
205 gb->sramDirtAge = frameCount;
206 gb->sramDirty &= ~GB_SRAM_DIRT_NEW;
207 if (!(gb->sramDirty & GB_SRAM_DIRT_SEEN)) {
208 gb->sramDirty |= GB_SRAM_DIRT_SEEN;
209 }
210 } else if ((gb->sramDirty & GB_SRAM_DIRT_SEEN) && frameCount - gb->sramDirtAge > CLEANUP_THRESHOLD) {
211 if (gb->memory.mbcType == GB_MBC3_RTC) {
212 GBMBCRTCWrite(gb);
213 }
214 gb->sramDirty = 0;
215 if (gb->memory.sram && gb->sramVf->sync(gb->sramVf, gb->memory.sram, gb->sramSize)) {
216 mLOG(GB_MEM, INFO, "Savedata synced");
217 } else {
218 mLOG(GB_MEM, INFO, "Savedata failed to sync!");
219 }
220 }
221}
222
223void GBSavedataMask(struct GB* gb, struct VFile* vf, bool writeback) {
224 GBSramDeinit(gb);
225 gb->sramVf = vf;
226 gb->sramMaskWriteback = writeback;
227 gb->memory.sram = vf->map(vf, gb->sramSize, MAP_READ);
228 GBMBCSwitchSramBank(gb, gb->memory.sramCurrentBank);
229}
230
231void GBSavedataUnmask(struct GB* gb) {
232 if (gb->sramVf == gb->sramRealVf) {
233 return;
234 }
235 struct VFile* vf = gb->sramVf;
236 GBSramDeinit(gb);
237 gb->sramVf = gb->sramRealVf;
238 gb->memory.sram = gb->sramVf->map(gb->sramVf, gb->sramSize, MAP_WRITE);
239 if (gb->sramMaskWriteback) {
240 vf->read(vf, gb->memory.sram, gb->sramSize);
241 }
242 vf->close(vf);
243}
244
245void GBUnloadROM(struct GB* gb) {
246 // TODO: Share with GBAUnloadROM
247 if (gb->memory.rom && gb->memory.romBase != gb->memory.rom && gb->memory.romBase != gb->pristineRom) {
248 free(gb->memory.romBase);
249 }
250 if (gb->memory.rom && gb->pristineRom != gb->memory.rom) {
251 if (gb->yankedRomSize) {
252 gb->yankedRomSize = 0;
253 }
254 mappedMemoryFree(gb->memory.rom, GB_SIZE_CART_MAX);
255 gb->memory.rom = gb->pristineRom;
256 }
257 gb->memory.rom = 0;
258
259 if (gb->romVf) {
260#ifndef _3DS
261 gb->romVf->unmap(gb->romVf, gb->pristineRom, gb->pristineRomSize);
262#endif
263 gb->romVf->close(gb->romVf);
264 gb->romVf = 0;
265 }
266 gb->pristineRom = 0;
267
268 GBSavedataUnmask(gb);
269 GBSramDeinit(gb);
270 if (gb->sramRealVf) {
271 gb->sramRealVf->close(gb->sramRealVf);
272 }
273 gb->sramRealVf = NULL;
274 gb->sramVf = NULL;
275}
276
277void GBSynthesizeROM(struct VFile* vf) {
278 if (!vf) {
279 return;
280 }
281 const struct GBCartridge cart = {
282 .logo = { _knownHeader[0], _knownHeader[1], _knownHeader[2], _knownHeader[3]}
283 };
284
285 vf->seek(vf, 0x100, SEEK_SET);
286 vf->write(vf, &cart, sizeof(cart));
287}
288
289void GBLoadBIOS(struct GB* gb, struct VFile* vf) {
290 gb->biosVf = vf;
291}
292
293void GBApplyPatch(struct GB* gb, struct Patch* patch) {
294 size_t patchedSize = patch->outputSize(patch, gb->memory.romSize);
295 if (!patchedSize) {
296 return;
297 }
298 if (patchedSize > GB_SIZE_CART_MAX) {
299 patchedSize = GB_SIZE_CART_MAX;
300 }
301 gb->memory.rom = anonymousMemoryMap(GB_SIZE_CART_MAX);
302 if (!patch->applyPatch(patch, gb->pristineRom, gb->pristineRomSize, gb->memory.rom, patchedSize)) {
303 mappedMemoryFree(gb->memory.rom, patchedSize);
304 gb->memory.rom = gb->pristineRom;
305 return;
306 }
307 gb->memory.romSize = patchedSize;
308 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
309}
310
311void GBDestroy(struct GB* gb) {
312 GBUnloadROM(gb);
313
314 if (gb->biosVf) {
315 gb->biosVf->close(gb->biosVf);
316 gb->biosVf = 0;
317 }
318
319 GBMemoryDeinit(gb);
320 GBAudioDeinit(&gb->audio);
321 GBVideoDeinit(&gb->video);
322 GBSIODeinit(&gb->sio);
323}
324
325void GBInterruptHandlerInit(struct LR35902InterruptHandler* irqh) {
326 irqh->reset = GBReset;
327 irqh->processEvents = GBProcessEvents;
328 irqh->setInterrupts = GBSetInterrupts;
329 irqh->hitIllegal = GBIllegal;
330 irqh->stop = GBStop;
331 irqh->halt = GBHalt;
332}
333
334static uint32_t _GBBiosCRC32(struct VFile* vf) {
335 ssize_t size = vf->size(vf);
336 if (size <= 0 || size > GB_SIZE_CART_BANK0) {
337 return 0;
338 }
339 void* bios = vf->map(vf, size, MAP_READ);
340 uint32_t biosCrc = doCrc32(bios, size);
341 vf->unmap(vf, bios, size);
342 return biosCrc;
343}
344
345bool GBIsBIOS(struct VFile* vf) {
346 switch (_GBBiosCRC32(vf)) {
347 case DMG_BIOS_CHECKSUM:
348 case DMG_2_BIOS_CHECKSUM:
349 case CGB_BIOS_CHECKSUM:
350 return true;
351 default:
352 return false;
353 }
354}
355
356void GBReset(struct LR35902Core* cpu) {
357 struct GB* gb = (struct GB*) cpu->master;
358 GBDetectModel(gb);
359 if (gb->biosVf) {
360 if (!GBIsBIOS(gb->biosVf)) {
361 gb->biosVf->close(gb->biosVf);
362 gb->biosVf = NULL;
363 } else {
364 gb->biosVf->seek(gb->biosVf, 0, SEEK_SET);
365 gb->memory.romBase = malloc(GB_SIZE_CART_BANK0);
366 ssize_t size = gb->biosVf->read(gb->biosVf, gb->memory.romBase, GB_SIZE_CART_BANK0);
367 memcpy(&gb->memory.romBase[size], &gb->memory.rom[size], GB_SIZE_CART_BANK0 - size);
368 if (size > 0x100) {
369 memcpy(&gb->memory.romBase[0x100], &gb->memory.rom[0x100], sizeof(struct GBCartridge));
370 }
371
372 cpu->a = 0;
373 cpu->f.packed = 0;
374 cpu->c = 0;
375 cpu->e = 0;
376 cpu->h = 0;
377 cpu->l = 0;
378 cpu->sp = 0;
379 cpu->pc = 0;
380 }
381 }
382
383 cpu->b = 0;
384 cpu->d = 0;
385
386 if (!gb->biosVf) {
387 switch (gb->model) {
388 case GB_MODEL_DMG:
389 // TODO: SGB
390 case GB_MODEL_SGB:
391 case GB_MODEL_AUTODETECT: // Silence warnings
392 gb->model = GB_MODEL_DMG;
393 cpu->a = 1;
394 cpu->f.packed = 0xB0;
395 cpu->c = 0x13;
396 cpu->e = 0xD8;
397 cpu->h = 1;
398 cpu->l = 0x4D;
399 break;
400 case GB_MODEL_AGB:
401 cpu->b = 1;
402 // Fall through
403 case GB_MODEL_CGB:
404 cpu->a = 0x11;
405 cpu->f.packed = 0x80;
406 cpu->c = 0;
407 cpu->e = 0x08;
408 cpu->h = 0;
409 cpu->l = 0x7C;
410 break;
411 }
412
413 cpu->sp = 0xFFFE;
414 cpu->pc = 0x100;
415 }
416
417 gb->eiPending = INT_MAX;
418 gb->doubleSpeed = 0;
419
420 cpu->memory.setActiveRegion(cpu, cpu->pc);
421
422 if (gb->yankedRomSize) {
423 gb->memory.romSize = gb->yankedRomSize;
424 gb->yankedRomSize = 0;
425 }
426 GBMemoryReset(gb);
427 GBVideoReset(&gb->video);
428 GBTimerReset(&gb->timer);
429 GBAudioReset(&gb->audio);
430 GBIOReset(gb);
431 GBSIOReset(&gb->sio);
432
433 GBSavedataUnmask(gb);
434}
435
436void GBDetectModel(struct GB* gb) {
437 if (gb->model != GB_MODEL_AUTODETECT) {
438 return;
439 }
440 if (gb->biosVf) {
441 switch (_GBBiosCRC32(gb->biosVf)) {
442 case DMG_BIOS_CHECKSUM:
443 case DMG_2_BIOS_CHECKSUM:
444 gb->model = GB_MODEL_DMG;
445 break;
446 case CGB_BIOS_CHECKSUM:
447 gb->model = GB_MODEL_CGB;
448 break;
449 default:
450 gb->biosVf->close(gb->biosVf);
451 gb->biosVf = NULL;
452 }
453 }
454 if (gb->model == GB_MODEL_AUTODETECT && gb->memory.rom) {
455 const struct GBCartridge* cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
456 if (cart->cgb & 0x80) {
457 gb->model = GB_MODEL_CGB;
458 } else {
459 gb->model = GB_MODEL_DMG;
460 }
461 }
462
463 switch (gb->model) {
464 case GB_MODEL_DMG:
465 case GB_MODEL_SGB:
466 case GB_MODEL_AUTODETECT: //Silence warnings
467 gb->audio.style = GB_AUDIO_DMG;
468 break;
469 case GB_MODEL_AGB:
470 case GB_MODEL_CGB:
471 gb->audio.style = GB_AUDIO_CGB;
472 break;
473 }
474}
475
476void GBUpdateIRQs(struct GB* gb) {
477 int irqs = gb->memory.ie & gb->memory.io[REG_IF];
478 if (!irqs) {
479 return;
480 }
481 gb->cpu->halted = false;
482
483 if (!gb->memory.ime || gb->cpu->irqPending) {
484 return;
485 }
486
487 if (irqs & (1 << GB_IRQ_VBLANK)) {
488 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_VBLANK);
489 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_VBLANK);
490 return;
491 }
492 if (irqs & (1 << GB_IRQ_LCDSTAT)) {
493 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_LCDSTAT);
494 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_LCDSTAT);
495 return;
496 }
497 if (irqs & (1 << GB_IRQ_TIMER)) {
498 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_TIMER);
499 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_TIMER);
500 return;
501 }
502 if (irqs & (1 << GB_IRQ_SIO)) {
503 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_SIO);
504 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_SIO);
505 return;
506 }
507 if (irqs & (1 << GB_IRQ_KEYPAD)) {
508 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_KEYPAD);
509 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_KEYPAD);
510 }
511}
512
513void GBProcessEvents(struct LR35902Core* cpu) {
514 struct GB* gb = (struct GB*) cpu->master;
515 do {
516 int32_t cycles = cpu->nextEvent;
517 int32_t nextEvent = INT_MAX;
518 int32_t testEvent;
519
520 if (gb->eiPending != INT_MAX) {
521 gb->eiPending -= cycles;
522 if (gb->eiPending <= 0) {
523 gb->memory.ime = true;
524 GBUpdateIRQs(gb);
525 gb->eiPending = INT_MAX;
526 } else {
527 nextEvent = gb->eiPending;
528 }
529 }
530
531 testEvent = GBVideoProcessEvents(&gb->video, cycles >> gb->doubleSpeed);
532 if (testEvent != INT_MAX) {
533 testEvent <<= gb->doubleSpeed;
534 if (testEvent < nextEvent) {
535 nextEvent = testEvent;
536 }
537 }
538
539 testEvent = GBAudioProcessEvents(&gb->audio, cycles >> gb->doubleSpeed);
540 if (testEvent != INT_MAX) {
541 testEvent <<= gb->doubleSpeed;
542 if (testEvent < nextEvent) {
543 nextEvent = testEvent;
544 }
545 }
546
547 testEvent = GBTimerProcessEvents(&gb->timer, cycles);
548 if (testEvent < nextEvent) {
549 nextEvent = testEvent;
550 }
551
552 testEvent = GBSIOProcessEvents(&gb->sio, cycles);
553 if (testEvent < nextEvent) {
554 nextEvent = testEvent;
555 }
556
557 testEvent = GBMemoryProcessEvents(gb, cycles);
558 if (testEvent < nextEvent) {
559 nextEvent = testEvent;
560 }
561
562 cpu->cycles -= cycles;
563 cpu->nextEvent = nextEvent;
564
565 if (cpu->halted) {
566 cpu->cycles = cpu->nextEvent;
567 if (!gb->memory.ie || !gb->memory.ime) {
568 break;
569 }
570 }
571 } while (cpu->cycles >= cpu->nextEvent);
572}
573
574void GBSetInterrupts(struct LR35902Core* cpu, bool enable) {
575 struct GB* gb = (struct GB*) cpu->master;
576 if (!enable) {
577 gb->memory.ime = enable;
578 gb->eiPending = INT_MAX;
579 GBUpdateIRQs(gb);
580 } else {
581 if (cpu->nextEvent > cpu->cycles + 4) {
582 cpu->nextEvent = cpu->cycles + 4;
583 }
584 gb->eiPending = cpu->cycles + 4;
585 }
586}
587
588void GBHalt(struct LR35902Core* cpu) {
589 if (!cpu->irqPending) {
590 cpu->cycles = cpu->nextEvent;
591 cpu->halted = true;
592 }
593}
594
595void GBStop(struct LR35902Core* cpu) {
596 struct GB* gb = (struct GB*) cpu->master;
597 if (cpu->bus) {
598 mLOG(GB, GAME_ERROR, "Hit illegal stop at address %04X:%02X\n", cpu->pc, cpu->bus);
599 }
600 if (gb->memory.io[REG_KEY1] & 1) {
601 gb->doubleSpeed ^= 1;
602 gb->memory.io[REG_KEY1] = 0;
603 gb->memory.io[REG_KEY1] |= gb->doubleSpeed << 7;
604 } else if (cpu->bus) {
605#ifdef USE_DEBUGGERS
606 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
607 struct mDebuggerEntryInfo info = {
608 .address = cpu->pc - 1,
609 .opcode = 0x1000 | cpu->bus
610 };
611 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
612 }
613#endif
614 // Hang forever
615 gb->memory.ime = 0;
616 cpu->pc -= 2;
617 }
618 // TODO: Actually stop
619}
620
621void GBIllegal(struct LR35902Core* cpu) {
622 struct GB* gb = (struct GB*) cpu->master;
623 mLOG(GB, GAME_ERROR, "Hit illegal opcode at address %04X:%02X\n", cpu->pc, cpu->bus);
624#ifdef USE_DEBUGGERS
625 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
626 struct mDebuggerEntryInfo info = {
627 .address = cpu->pc,
628 .opcode = cpu->bus
629 };
630 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
631 }
632#endif
633 // Hang forever
634 gb->memory.ime = 0;
635 --cpu->pc;
636}
637
638bool GBIsROM(struct VFile* vf) {
639 vf->seek(vf, 0x104, SEEK_SET);
640 uint8_t header[4];
641
642 if (vf->read(vf, &header, sizeof(header)) < (ssize_t) sizeof(header)) {
643 return false;
644 }
645 if (memcmp(header, _knownHeader, sizeof(header))) {
646 return false;
647 }
648 return true;
649}
650
651void GBGetGameTitle(const struct GB* gb, char* out) {
652 const struct GBCartridge* cart = NULL;
653 if (gb->memory.rom) {
654 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
655 }
656 if (gb->pristineRom) {
657 cart = (const struct GBCartridge*) &((uint8_t*) gb->pristineRom)[0x100];
658 }
659 if (!cart) {
660 return;
661 }
662 if (cart->oldLicensee != 0x33) {
663 memcpy(out, cart->titleLong, 16);
664 } else {
665 memcpy(out, cart->titleShort, 11);
666 }
667}
668
669void GBGetGameCode(const struct GB* gb, char* out) {
670 memset(out, 0, 8);
671 const struct GBCartridge* cart = NULL;
672 if (gb->memory.rom) {
673 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
674 }
675 if (gb->pristineRom) {
676 cart = (const struct GBCartridge*) &((uint8_t*) gb->pristineRom)[0x100];
677 }
678 if (!cart) {
679 return;
680 }
681 if (cart->cgb == 0xC0) {
682 memcpy(out, "CGB-????", 8);
683 } else {
684 memcpy(out, "DMG-????", 8);
685 }
686 if (cart->oldLicensee == 0x33) {
687 memcpy(&out[4], cart->maker, 4);
688 }
689}
690
691void GBFrameEnded(struct GB* gb) {
692 GBSramClean(gb, gb->video.frameCounter);
693
694 if (gb->cpu->components && gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
695 struct mCheatDevice* device = (struct mCheatDevice*) gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
696 size_t i;
697 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
698 struct mCheatSet* cheats = *mCheatSetsGetPointer(&device->cheats, i);
699 mCheatRefresh(device, cheats);
700 }
701 }
702}