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