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 void GBIllegal(struct LR35902Core* cpu);
43static void GBStop(struct LR35902Core* cpu);
44
45static void _enableInterrupts(struct mTiming* timing, void* user, uint32_t cyclesLate);
46
47#ifdef FIXED_ROM_BUFFER
48extern uint32_t* romBuffer;
49extern size_t romBufferSize;
50#endif
51
52void GBCreate(struct GB* gb) {
53 gb->d.id = GB_COMPONENT_MAGIC;
54 gb->d.init = GBInit;
55 gb->d.deinit = GBDeinit;
56}
57
58static void GBInit(void* cpu, struct mCPUComponent* component) {
59 struct GB* gb = (struct GB*) component;
60 gb->cpu = cpu;
61 gb->sync = NULL;
62
63 GBInterruptHandlerInit(&gb->cpu->irqh);
64 GBMemoryInit(gb);
65
66 gb->video.p = gb;
67 GBVideoInit(&gb->video);
68
69 gb->audio.p = gb;
70 GBAudioInit(&gb->audio, 2048, &gb->memory.io[REG_NR52], GB_AUDIO_DMG); // TODO: Remove magic constant
71
72 gb->sio.p = gb;
73 GBSIOInit(&gb->sio);
74
75 gb->timer.p = gb;
76
77 gb->model = GB_MODEL_AUTODETECT;
78
79 gb->biosVf = NULL;
80 gb->romVf = NULL;
81 gb->sramVf = NULL;
82 gb->sramRealVf = NULL;
83
84 gb->isPristine = false;
85 gb->pristineRomSize = 0;
86 gb->yankedRomSize = 0;
87
88 mCoreCallbacksListInit(&gb->coreCallbacks, 0);
89 gb->stream = NULL;
90
91 mTimingInit(&gb->timing, &gb->cpu->cycles, &gb->cpu->nextEvent);
92 gb->audio.timing = &gb->timing;
93
94 gb->eiPending.name = "GB EI";
95 gb->eiPending.callback = _enableInterrupts;
96 gb->eiPending.context = gb;
97 gb->eiPending.priority = 0;
98}
99
100static void GBDeinit(struct mCPUComponent* component) {
101 struct GB* gb = (struct GB*) component;
102 mTimingDeinit(&gb->timing);
103}
104
105bool GBLoadROM(struct GB* gb, struct VFile* vf) {
106 if (!vf) {
107 return false;
108 }
109 GBUnloadROM(gb);
110 gb->romVf = vf;
111 gb->pristineRomSize = vf->size(vf);
112 vf->seek(vf, 0, SEEK_SET);
113 gb->isPristine = true;
114#ifdef FIXED_ROM_BUFFER
115 if (gb->pristineRomSize <= romBufferSize) {
116 gb->memory.rom = romBuffer;
117 vf->read(vf, romBuffer, gb->pristineRomSize);
118 }
119#else
120 gb->memory.rom = vf->map(vf, gb->pristineRomSize, MAP_READ);
121#endif
122 if (!gb->memory.rom) {
123 return false;
124 }
125 gb->yankedRomSize = 0;
126 gb->memory.romBase = gb->memory.rom;
127 gb->memory.romSize = gb->pristineRomSize;
128 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
129 GBMBCInit(gb);
130
131 if (gb->cpu) {
132 struct LR35902Core* cpu = gb->cpu;
133 cpu->memory.setActiveRegion(cpu, cpu->pc);
134 }
135
136 // TODO: error check
137 return true;
138}
139
140static void GBSramDeinit(struct GB* gb) {
141 if (gb->sramVf) {
142 gb->sramVf->unmap(gb->sramVf, gb->memory.sram, gb->sramSize);
143 if (gb->memory.mbcType == GB_MBC3_RTC && gb->sramVf == gb->sramRealVf) {
144 GBMBCRTCWrite(gb);
145 }
146 gb->sramVf = NULL;
147 } else if (gb->memory.sram) {
148 mappedMemoryFree(gb->memory.sram, gb->sramSize);
149 }
150 gb->memory.sram = 0;
151}
152
153bool GBLoadSave(struct GB* gb, struct VFile* vf) {
154 GBSramDeinit(gb);
155 gb->sramVf = vf;
156 gb->sramRealVf = vf;
157 if (gb->sramSize) {
158 GBResizeSram(gb, gb->sramSize);
159 }
160 return vf;
161}
162
163void GBResizeSram(struct GB* gb, size_t size) {
164 if (gb->memory.sram && size <= gb->sramSize) {
165 return;
166 }
167 struct VFile* vf = gb->sramVf;
168 if (vf) {
169 if (vf == gb->sramRealVf) {
170 ssize_t vfSize = vf->size(vf);
171 if (vfSize >= 0 && (size_t) vfSize < size) {
172 uint8_t extdataBuffer[0x100];
173 if (vfSize & 0xFF) {
174 vf->seek(vf, -(vfSize & 0xFF), SEEK_END);
175 vf->read(vf, extdataBuffer, vfSize & 0xFF);
176 }
177 if (gb->memory.sram) {
178 vf->unmap(vf, gb->memory.sram, gb->sramSize);
179 }
180 vf->truncate(vf, size + (vfSize & 0xFF));
181 if (vfSize & 0xFF) {
182 vf->seek(vf, size, SEEK_SET);
183 vf->write(vf, extdataBuffer, vfSize & 0xFF);
184 }
185 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
186 memset(&gb->memory.sram[gb->sramSize], 0xFF, size - gb->sramSize);
187 } else if (size > gb->sramSize || !gb->memory.sram) {
188 if (gb->memory.sram) {
189 vf->unmap(vf, gb->memory.sram, gb->sramSize);
190 }
191 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
192 }
193 } else {
194 if (gb->memory.sram) {
195 vf->unmap(vf, gb->memory.sram, gb->sramSize);
196 }
197 gb->memory.sram = vf->map(vf, size, MAP_READ);
198 }
199 if (gb->memory.sram == (void*) -1) {
200 gb->memory.sram = NULL;
201 }
202 } else {
203 uint8_t* newSram = anonymousMemoryMap(size);
204 if (gb->memory.sram) {
205 if (size > gb->sramSize) {
206 memcpy(newSram, gb->memory.sram, gb->sramSize);
207 memset(&newSram[gb->sramSize], 0xFF, size - gb->sramSize);
208 } else {
209 memcpy(newSram, gb->memory.sram, size);
210 }
211 mappedMemoryFree(gb->memory.sram, gb->sramSize);
212 } else {
213 memset(newSram, 0xFF, size);
214 }
215 gb->memory.sram = newSram;
216 }
217 if (gb->sramSize < size) {
218 gb->sramSize = size;
219 }
220}
221
222void GBSramClean(struct GB* gb, uint32_t frameCount) {
223 // TODO: Share with GBASavedataClean
224 if (!gb->sramVf) {
225 return;
226 }
227 if (gb->sramDirty & GB_SRAM_DIRT_NEW) {
228 gb->sramDirtAge = frameCount;
229 gb->sramDirty &= ~GB_SRAM_DIRT_NEW;
230 if (!(gb->sramDirty & GB_SRAM_DIRT_SEEN)) {
231 gb->sramDirty |= GB_SRAM_DIRT_SEEN;
232 }
233 } else if ((gb->sramDirty & GB_SRAM_DIRT_SEEN) && frameCount - gb->sramDirtAge > CLEANUP_THRESHOLD) {
234 if (gb->sramMaskWriteback) {
235 GBSavedataUnmask(gb);
236 }
237 if (gb->memory.mbcType == GB_MBC3_RTC) {
238 GBMBCRTCWrite(gb);
239 }
240 gb->sramDirty = 0;
241 if (gb->memory.sram && gb->sramVf->sync(gb->sramVf, gb->memory.sram, gb->sramSize)) {
242 mLOG(GB_MEM, INFO, "Savedata synced");
243 } else {
244 mLOG(GB_MEM, INFO, "Savedata failed to sync!");
245 }
246 }
247}
248
249void GBSavedataMask(struct GB* gb, struct VFile* vf, bool writeback) {
250 GBSramDeinit(gb);
251 gb->sramVf = vf;
252 gb->sramMaskWriteback = writeback;
253 gb->memory.sram = vf->map(vf, gb->sramSize, MAP_READ);
254 GBMBCSwitchSramBank(gb, gb->memory.sramCurrentBank);
255}
256
257void GBSavedataUnmask(struct GB* gb) {
258 if (gb->sramVf == gb->sramRealVf) {
259 return;
260 }
261 struct VFile* vf = gb->sramVf;
262 GBSramDeinit(gb);
263 gb->sramVf = gb->sramRealVf;
264 gb->memory.sram = gb->sramVf->map(gb->sramVf, gb->sramSize, MAP_WRITE);
265 if (gb->sramMaskWriteback) {
266 vf->seek(vf, 0, SEEK_SET);
267 vf->read(vf, gb->memory.sram, gb->sramSize);
268 gb->sramMaskWriteback = false;
269 }
270 vf->close(vf);
271}
272
273void GBUnloadROM(struct GB* gb) {
274 // TODO: Share with GBAUnloadROM
275 if (gb->memory.rom && gb->memory.romBase != gb->memory.rom && !gb->isPristine) {
276 free(gb->memory.romBase);
277 }
278 if (gb->memory.rom && !gb->isPristine) {
279 if (gb->yankedRomSize) {
280 gb->yankedRomSize = 0;
281 }
282 mappedMemoryFree(gb->memory.rom, GB_SIZE_CART_MAX);
283 }
284
285 if (gb->romVf) {
286#ifndef FIXED_ROM_BUFFER
287 gb->romVf->unmap(gb->romVf, gb->memory.rom, gb->pristineRomSize);
288#endif
289 gb->romVf->close(gb->romVf);
290 gb->romVf = NULL;
291 }
292 gb->memory.rom = NULL;
293 gb->memory.mbcType = GB_MBC_AUTODETECT;
294 gb->isPristine = false;
295
296 gb->sramMaskWriteback = false;
297 GBSavedataUnmask(gb);
298 GBSramDeinit(gb);
299 if (gb->sramRealVf) {
300 gb->sramRealVf->close(gb->sramRealVf);
301 }
302 gb->sramRealVf = NULL;
303 gb->sramVf = NULL;
304 if (gb->memory.cam && gb->memory.cam->stopRequestImage) {
305 gb->memory.cam->stopRequestImage(gb->memory.cam);
306 }
307}
308
309void GBSynthesizeROM(struct VFile* vf) {
310 if (!vf) {
311 return;
312 }
313 const struct GBCartridge cart = {
314 .logo = { _knownHeader[0], _knownHeader[1], _knownHeader[2], _knownHeader[3]}
315 };
316
317 vf->seek(vf, 0x100, SEEK_SET);
318 vf->write(vf, &cart, sizeof(cart));
319}
320
321void GBLoadBIOS(struct GB* gb, struct VFile* vf) {
322 gb->biosVf = vf;
323}
324
325void GBApplyPatch(struct GB* gb, struct Patch* patch) {
326 size_t patchedSize = patch->outputSize(patch, gb->memory.romSize);
327 if (!patchedSize) {
328 return;
329 }
330 if (patchedSize > GB_SIZE_CART_MAX) {
331 patchedSize = GB_SIZE_CART_MAX;
332 }
333 void* newRom = anonymousMemoryMap(GB_SIZE_CART_MAX);
334 if (!patch->applyPatch(patch, gb->memory.rom, gb->pristineRomSize, newRom, patchedSize)) {
335 mappedMemoryFree(newRom, GB_SIZE_CART_MAX);
336 return;
337 }
338 if (gb->romVf) {
339#ifndef FIXED_ROM_BUFFER
340 gb->romVf->unmap(gb->romVf, gb->memory.rom, gb->pristineRomSize);
341#endif
342 gb->romVf->close(gb->romVf);
343 gb->romVf = NULL;
344 }
345 gb->isPristine = false;
346 if (gb->memory.romBase == gb->memory.rom) {
347 gb->memory.romBase = newRom;
348 }
349 gb->memory.rom = newRom;
350 gb->memory.romSize = patchedSize;
351 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
352 gb->cpu->memory.setActiveRegion(gb->cpu, gb->cpu->pc);
353}
354
355void GBDestroy(struct GB* gb) {
356 GBUnloadROM(gb);
357
358 if (gb->biosVf) {
359 gb->biosVf->close(gb->biosVf);
360 gb->biosVf = 0;
361 }
362
363 GBMemoryDeinit(gb);
364 GBAudioDeinit(&gb->audio);
365 GBVideoDeinit(&gb->video);
366 GBSIODeinit(&gb->sio);
367 mCoreCallbacksListDeinit(&gb->coreCallbacks);
368}
369
370void GBInterruptHandlerInit(struct LR35902InterruptHandler* irqh) {
371 irqh->reset = GBReset;
372 irqh->processEvents = GBProcessEvents;
373 irqh->setInterrupts = GBSetInterrupts;
374 irqh->hitIllegal = GBIllegal;
375 irqh->stop = GBStop;
376 irqh->halt = GBHalt;
377}
378
379static uint32_t _GBBiosCRC32(struct VFile* vf) {
380 ssize_t size = vf->size(vf);
381 if (size <= 0 || size > GB_SIZE_CART_BANK0) {
382 return 0;
383 }
384 void* bios = vf->map(vf, size, MAP_READ);
385 uint32_t biosCrc = doCrc32(bios, size);
386 vf->unmap(vf, bios, size);
387 return biosCrc;
388}
389
390bool GBIsBIOS(struct VFile* vf) {
391 switch (_GBBiosCRC32(vf)) {
392 case DMG_BIOS_CHECKSUM:
393 case DMG_2_BIOS_CHECKSUM:
394 case MGB_BIOS_CHECKSUM:
395 case SGB_BIOS_CHECKSUM:
396 case CGB_BIOS_CHECKSUM:
397 return true;
398 default:
399 return false;
400 }
401}
402
403void GBReset(struct LR35902Core* cpu) {
404 struct GB* gb = (struct GB*) cpu->master;
405 gb->memory.romBase = gb->memory.rom;
406 GBDetectModel(gb);
407
408 if (gb->biosVf) {
409 if (!GBIsBIOS(gb->biosVf)) {
410 gb->biosVf->close(gb->biosVf);
411 gb->biosVf = NULL;
412 } else {
413 gb->biosVf->seek(gb->biosVf, 0, SEEK_SET);
414 gb->memory.romBase = malloc(GB_SIZE_CART_BANK0);
415 ssize_t size = gb->biosVf->read(gb->biosVf, gb->memory.romBase, GB_SIZE_CART_BANK0);
416 memcpy(&gb->memory.romBase[size], &gb->memory.rom[size], GB_SIZE_CART_BANK0 - size);
417 if (size > 0x100) {
418 memcpy(&gb->memory.romBase[0x100], &gb->memory.rom[0x100], sizeof(struct GBCartridge));
419 }
420
421 cpu->a = 0;
422 cpu->f.packed = 0;
423 cpu->c = 0;
424 cpu->e = 0;
425 cpu->h = 0;
426 cpu->l = 0;
427 cpu->sp = 0;
428 cpu->pc = 0;
429 }
430 }
431
432 cpu->b = 0;
433 cpu->d = 0;
434
435 if (!gb->biosVf) {
436 switch (gb->model) {
437 case GB_MODEL_AUTODETECT: // Silence warnings
438 gb->model = GB_MODEL_DMG;
439 case GB_MODEL_DMG:
440 cpu->a = 1;
441 cpu->f.packed = 0xB0;
442 cpu->c = 0x13;
443 cpu->e = 0xD8;
444 cpu->h = 1;
445 cpu->l = 0x4D;
446 gb->timer.internalDiv = 0x2AF3;
447 break;
448 case GB_MODEL_SGB:
449 cpu->a = 1;
450 cpu->f.packed = 0x00;
451 cpu->c = 0x14;
452 cpu->e = 0x00;
453 cpu->h = 0xC0;
454 cpu->l = 0x60;
455 gb->timer.internalDiv = 0x2AF3;
456 break;
457 case GB_MODEL_MGB:
458 cpu->a = 0xFF;
459 cpu->f.packed = 0xB0;
460 cpu->c = 0x13;
461 cpu->e = 0xD8;
462 cpu->h = 1;
463 cpu->l = 0x4D;
464 gb->timer.internalDiv = 0x2AF3;
465 break;
466 case GB_MODEL_SGB2:
467 cpu->a = 0xFF;
468 cpu->f.packed = 0x00;
469 cpu->c = 0x14;
470 cpu->e = 0x00;
471 cpu->h = 0xC0;
472 cpu->l = 0x60;
473 gb->timer.internalDiv = 0x2AF3;
474 break;
475 case GB_MODEL_AGB:
476 cpu->b = 1;
477 // Fall through
478 case GB_MODEL_CGB:
479 cpu->a = 0x11;
480 cpu->f.packed = 0x80;
481 cpu->c = 0;
482 cpu->e = 0x08;
483 cpu->h = 0;
484 cpu->l = 0x7C;
485 gb->timer.internalDiv = 0x7A8;
486 break;
487 }
488
489 cpu->sp = 0xFFFE;
490 cpu->pc = 0x100;
491 }
492
493 gb->cpuBlocked = false;
494 gb->earlyExit = false;
495 gb->doubleSpeed = 0;
496
497 cpu->memory.setActiveRegion(cpu, cpu->pc);
498
499 if (gb->yankedRomSize) {
500 gb->memory.romSize = gb->yankedRomSize;
501 gb->yankedRomSize = 0;
502 }
503
504 gb->sgbBit = -1;
505 gb->currentSgbBits = 0;
506 memset(gb->sgbPacket, 0, sizeof(gb->sgbPacket));
507
508 mTimingClear(&gb->timing);
509
510 GBMemoryReset(gb);
511 GBVideoReset(&gb->video);
512 GBTimerReset(&gb->timer);
513 mTimingSchedule(&gb->timing, &gb->timer.event, GB_DMG_DIV_PERIOD);
514
515 GBAudioReset(&gb->audio);
516 GBIOReset(gb);
517 GBSIOReset(&gb->sio);
518
519 GBSavedataUnmask(gb);
520}
521
522void GBDetectModel(struct GB* gb) {
523 if (gb->model != GB_MODEL_AUTODETECT) {
524 return;
525 }
526 if (gb->biosVf) {
527 switch (_GBBiosCRC32(gb->biosVf)) {
528 case DMG_BIOS_CHECKSUM:
529 case DMG_2_BIOS_CHECKSUM:
530 gb->model = GB_MODEL_DMG;
531 break;
532 case MGB_BIOS_CHECKSUM:
533 gb->model = GB_MODEL_MGB;
534 break;
535 case SGB_BIOS_CHECKSUM:
536 gb->model = GB_MODEL_SGB;
537 break;
538 case CGB_BIOS_CHECKSUM:
539 gb->model = GB_MODEL_CGB;
540 break;
541 default:
542 gb->biosVf->close(gb->biosVf);
543 gb->biosVf = NULL;
544 }
545 }
546 if (gb->model == GB_MODEL_AUTODETECT && gb->memory.rom) {
547 const struct GBCartridge* cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
548 if (cart->cgb & 0x80) {
549 gb->model = GB_MODEL_CGB;
550 } else if (cart->sgb == 0x03 && cart->oldLicensee == 0x33) {
551 gb->model = GB_MODEL_SGB;
552 } else {
553 gb->model = GB_MODEL_DMG;
554 }
555 }
556
557 switch (gb->model) {
558 case GB_MODEL_DMG:
559 case GB_MODEL_SGB:
560 case GB_MODEL_AUTODETECT: //Silence warnings
561 gb->audio.style = GB_AUDIO_DMG;
562 break;
563 case GB_MODEL_MGB:
564 case GB_MODEL_SGB2:
565 gb->audio.style = GB_AUDIO_MGB;
566 break;
567 case GB_MODEL_AGB:
568 case GB_MODEL_CGB:
569 gb->audio.style = GB_AUDIO_CGB;
570 break;
571 }
572}
573
574void GBUpdateIRQs(struct GB* gb) {
575 int irqs = gb->memory.ie & gb->memory.io[REG_IF];
576 if (!irqs) {
577 return;
578 }
579 gb->cpu->halted = false;
580
581 if (!gb->memory.ime || gb->cpu->irqPending) {
582 return;
583 }
584
585 if (irqs & (1 << GB_IRQ_VBLANK)) {
586 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_VBLANK);
587 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_VBLANK);
588 return;
589 }
590 if (irqs & (1 << GB_IRQ_LCDSTAT)) {
591 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_LCDSTAT);
592 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_LCDSTAT);
593 return;
594 }
595 if (irqs & (1 << GB_IRQ_TIMER)) {
596 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_TIMER);
597 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_TIMER);
598 return;
599 }
600 if (irqs & (1 << GB_IRQ_SIO)) {
601 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_SIO);
602 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_SIO);
603 return;
604 }
605 if (irqs & (1 << GB_IRQ_KEYPAD)) {
606 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_KEYPAD);
607 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_KEYPAD);
608 }
609}
610
611void GBProcessEvents(struct LR35902Core* cpu) {
612 struct GB* gb = (struct GB*) cpu->master;
613 do {
614 int32_t cycles = cpu->cycles;
615 int32_t nextEvent;
616
617 cpu->cycles = 0;
618 cpu->nextEvent = INT_MAX;
619
620 nextEvent = cycles;
621 do {
622 nextEvent = mTimingTick(&gb->timing, nextEvent);
623 } while (gb->cpuBlocked);
624 cpu->nextEvent = nextEvent;
625
626 if (gb->earlyExit) {
627 gb->earlyExit = false;
628 break;
629 }
630 if (cpu->halted) {
631 cpu->cycles = cpu->nextEvent;
632 if (!gb->memory.ie || !gb->memory.ime) {
633 break;
634 }
635 }
636 } while (cpu->cycles >= cpu->nextEvent);
637}
638
639void GBSetInterrupts(struct LR35902Core* cpu, bool enable) {
640 struct GB* gb = (struct GB*) cpu->master;
641 if (!enable) {
642 gb->memory.ime = enable;
643 mTimingDeschedule(&gb->timing, &gb->eiPending);
644 GBUpdateIRQs(gb);
645 } else {
646 mTimingDeschedule(&gb->timing, &gb->eiPending);
647 mTimingSchedule(&gb->timing, &gb->eiPending, 4);
648 }
649}
650
651static void _enableInterrupts(struct mTiming* timing, void* user, uint32_t cyclesLate) {
652 UNUSED(timing);
653 UNUSED(cyclesLate);
654 struct GB* gb = user;
655 gb->memory.ime = true;
656 GBUpdateIRQs(gb);
657}
658
659void GBHalt(struct LR35902Core* cpu) {
660 if (!cpu->irqPending) {
661 cpu->cycles = cpu->nextEvent;
662 cpu->halted = true;
663 }
664}
665
666void GBStop(struct LR35902Core* cpu) {
667 struct GB* gb = (struct GB*) cpu->master;
668 if (cpu->bus) {
669 mLOG(GB, GAME_ERROR, "Hit illegal stop at address %04X:%02X", cpu->pc, cpu->bus);
670 }
671 if (gb->memory.io[REG_KEY1] & 1) {
672 gb->doubleSpeed ^= 1;
673 gb->audio.timingFactor = gb->doubleSpeed + 1;
674 gb->memory.io[REG_KEY1] = 0;
675 gb->memory.io[REG_KEY1] |= gb->doubleSpeed << 7;
676 } else if (cpu->bus) {
677#ifdef USE_DEBUGGERS
678 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
679 struct mDebuggerEntryInfo info = {
680 .address = cpu->pc - 1,
681 .opcode = 0x1000 | cpu->bus
682 };
683 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
684 }
685#endif
686 // Hang forever
687 gb->memory.ime = 0;
688 cpu->pc -= 2;
689 }
690 // TODO: Actually stop
691}
692
693void GBIllegal(struct LR35902Core* cpu) {
694 struct GB* gb = (struct GB*) cpu->master;
695 mLOG(GB, GAME_ERROR, "Hit illegal opcode at address %04X:%02X", cpu->pc, cpu->bus);
696#ifdef USE_DEBUGGERS
697 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
698 struct mDebuggerEntryInfo info = {
699 .address = cpu->pc,
700 .opcode = cpu->bus
701 };
702 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
703 }
704#endif
705 // Hang forever
706 gb->memory.ime = 0;
707 --cpu->pc;
708}
709
710bool GBIsROM(struct VFile* vf) {
711 if (!vf) {
712 return false;
713 }
714 vf->seek(vf, 0x104, SEEK_SET);
715 uint8_t header[4];
716
717 if (vf->read(vf, &header, sizeof(header)) < (ssize_t) sizeof(header)) {
718 return false;
719 }
720 if (memcmp(header, _knownHeader, sizeof(header))) {
721 return false;
722 }
723 return true;
724}
725
726void GBGetGameTitle(const struct GB* gb, char* out) {
727 const struct GBCartridge* cart = NULL;
728 if (gb->memory.rom) {
729 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
730 }
731 if (!cart) {
732 return;
733 }
734 if (cart->oldLicensee != 0x33) {
735 memcpy(out, cart->titleLong, 16);
736 } else {
737 memcpy(out, cart->titleShort, 11);
738 }
739}
740
741void GBGetGameCode(const struct GB* gb, char* out) {
742 memset(out, 0, 8);
743 const struct GBCartridge* cart = NULL;
744 if (gb->memory.rom) {
745 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
746 }
747 if (!cart) {
748 return;
749 }
750 if (cart->cgb == 0xC0) {
751 memcpy(out, "CGB-????", 8);
752 } else {
753 memcpy(out, "DMG-????", 8);
754 }
755 if (cart->oldLicensee == 0x33) {
756 memcpy(&out[4], cart->maker, 4);
757 }
758}
759
760void GBFrameEnded(struct GB* gb) {
761 GBSramClean(gb, gb->video.frameCounter);
762
763 if (gb->cpu->components && gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
764 struct mCheatDevice* device = (struct mCheatDevice*) gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
765 size_t i;
766 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
767 struct mCheatSet* cheats = *mCheatSetsGetPointer(&device->cheats, i);
768 mCheatRefresh(device, cheats);
769 }
770 }
771
772 GBTestKeypadIRQ(gb);
773}
774
775enum GBModel GBNameToModel(const char* model) {
776 if (strcasecmp(model, "DMG") == 0) {
777 return GB_MODEL_DMG;
778 } else if (strcasecmp(model, "CGB") == 0) {
779 return GB_MODEL_CGB;
780 } else if (strcasecmp(model, "AGB") == 0) {
781 return GB_MODEL_AGB;
782 } else if (strcasecmp(model, "SGB") == 0) {
783 return GB_MODEL_SGB;
784 } else if (strcasecmp(model, "MGB") == 0) {
785 return GB_MODEL_MGB;
786 } else if (strcasecmp(model, "SGB2") == 0) {
787 return GB_MODEL_SGB2;
788 }
789 return GB_MODEL_AUTODETECT;
790}
791
792const char* GBModelToName(enum GBModel model) {
793 switch (model) {
794 case GB_MODEL_DMG:
795 return "DMG";
796 case GB_MODEL_SGB:
797 return "SGB";
798 case GB_MODEL_MGB:
799 return "MGB";
800 case GB_MODEL_SGB2:
801 return "SGB2";
802 case GB_MODEL_CGB:
803 return "CGB";
804 case GB_MODEL_AGB:
805 return "AGB";
806 default:
807 case GB_MODEL_AUTODETECT:
808 return NULL;
809 }
810}