src/gba/gba.c (view raw)
1/* Copyright (c) 2013-2014 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 "gba.h"
7
8#include "gba-bios.h"
9#include "gba-io.h"
10#include "gba-rr.h"
11#include "gba-sio.h"
12#include "gba-thread.h"
13
14#include "isa-inlines.h"
15
16#include "util/crc32.h"
17#include "util/memory.h"
18#include "util/patch.h"
19#include "util/vfs.h"
20
21const uint32_t GBA_ARM7TDMI_FREQUENCY = 0x1000000;
22const uint32_t GBA_COMPONENT_MAGIC = 0x1000000;
23
24static const size_t GBA_ROM_MAGIC_OFFSET = 2;
25static const uint8_t GBA_ROM_MAGIC[] = { 0x00, 0xEA };
26
27struct GBACartridgeOverride {
28 const char id[4];
29 enum SavedataType type;
30 int gpio;
31 uint32_t busyLoop;
32};
33
34static const struct GBACartridgeOverride _overrides[] = {
35 // Boktai: The Sun is in Your Hand
36 { "U3IE", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
37 { "U3IP", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
38
39 // Boktai 2: Solar Boy Django
40 { "U32E", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
41 { "U32P", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
42
43 // Drill Dozer
44 { "V49J", SAVEDATA_SRAM, GPIO_RUMBLE, -1 },
45 { "V49E", SAVEDATA_SRAM, GPIO_RUMBLE, -1 },
46
47 // Final Fantasy Tactics Advance
48 { "AFXE", SAVEDATA_FLASH512, GPIO_NONE, 0x8000418 },
49
50 // Golden Sun: The Lost Age
51 { "AGFE", SAVEDATA_FLASH512, GPIO_NONE, 0x801353A },
52
53 // Koro Koro Puzzle - Happy Panechu!
54 { "KHPJ", SAVEDATA_EEPROM, GPIO_TILT, -1 },
55
56 // Mega Man Battle Network
57 { "AREE", SAVEDATA_SRAM, GPIO_NONE, 0x800032E },
58
59 // Metal Slug Advance
60 { "BSME", SAVEDATA_EEPROM, GPIO_NONE, 0x8000290 },
61
62 // Pokemon Ruby
63 { "AXVJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
64 { "AXVE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
65 { "AXVP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
66 { "AXVI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
67 { "AXVS", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
68 { "AXVD", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
69 { "AXVF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
70
71 // Pokemon Sapphire
72 { "AXPJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
73 { "AXPE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
74 { "AXPP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
75 { "AXPI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
76 { "AXPS", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
77 { "AXPD", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
78 { "AXPF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
79
80 // Pokemon Emerald
81 { "BPEJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
82 { "BPEE", SAVEDATA_FLASH1M, GPIO_RTC, 0x80008C6 },
83 { "BPEP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
84 { "BPEI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
85 { "BPES", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
86 { "BPED", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
87 { "BPEF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
88
89 // Pokemon Mystery Dungeon
90 { "B24J", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
91 { "B24E", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
92 { "B24P", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
93 { "B24U", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
94
95 // Pokemon FireRed
96 { "BPRJ", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
97 { "BPRE", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
98 { "BPRP", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
99
100 // Pokemon LeafGreen
101 { "BPGJ", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
102 { "BPGE", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
103 { "BPGP", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
104
105 // RockMan EXE 4.5 - Real Operation
106 { "BR4J", SAVEDATA_FLASH512, GPIO_RTC, -1 },
107
108 // Super Mario Advance 2
109 { "AA2E", SAVEDATA_EEPROM, GPIO_NONE, 0x800052E },
110
111 // Super Mario Advance 4
112 { "AX4J", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
113 { "AX4E", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
114 { "AX4P", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
115
116 // Wario Ware Twisted
117 { "RZWJ", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
118 { "RZWE", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
119 { "RZWP", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
120
121 // Yoshi's Universal Gravitation
122 { "KYGJ", SAVEDATA_EEPROM, GPIO_TILT, -1 },
123 { "KYGE", SAVEDATA_EEPROM, GPIO_TILT, -1 },
124 { "KYGP", SAVEDATA_EEPROM, GPIO_TILT, -1 },
125
126 { { 0, 0, 0, 0 }, 0, 0, -1 }
127};
128
129static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component);
130static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
131static void GBAProcessEvents(struct ARMCore* cpu);
132static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
133static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
134static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
135
136static void _checkOverrides(struct GBA* gba, uint32_t code);
137
138void GBACreate(struct GBA* gba) {
139 gba->d.id = GBA_COMPONENT_MAGIC;
140 gba->d.init = GBAInit;
141 gba->d.deinit = 0;
142}
143
144static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component) {
145 struct GBA* gba = (struct GBA*) component;
146 gba->cpu = cpu;
147 gba->debugger = 0;
148
149 GBAInterruptHandlerInit(&cpu->irqh);
150 GBAMemoryInit(gba);
151 GBASavedataInit(&gba->memory.savedata, 0);
152
153 gba->video.p = gba;
154 GBAVideoInit(&gba->video);
155
156 gba->audio.p = gba;
157 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
158
159 GBAIOInit(gba);
160
161 gba->sio.p = gba;
162 GBASIOInit(&gba->sio);
163
164 gba->timersEnabled = 0;
165 memset(gba->timers, 0, sizeof(gba->timers));
166
167 gba->springIRQ = 0;
168 gba->keySource = 0;
169 gba->rotationSource = 0;
170 gba->luminanceSource = 0;
171 gba->rtcSource = 0;
172 gba->rumble = 0;
173 gba->rr = 0;
174
175 gba->romVf = 0;
176 gba->biosVf = 0;
177
178 gba->logLevel = GBA_LOG_INFO | GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
179
180 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
181
182 gba->busyLoop = -1;
183}
184
185void GBADestroy(struct GBA* gba) {
186 if (gba->pristineRom == gba->memory.rom) {
187 gba->memory.rom = 0;
188 }
189
190 if (gba->romVf) {
191 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
192 }
193
194 if (gba->biosVf) {
195 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
196 }
197
198 GBAMemoryDeinit(gba);
199 GBAVideoDeinit(&gba->video);
200 GBAAudioDeinit(&gba->audio);
201 GBARRContextDestroy(gba);
202}
203
204void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
205 irqh->reset = GBAReset;
206 irqh->processEvents = GBAProcessEvents;
207 irqh->swi16 = GBASwi16;
208 irqh->swi32 = GBASwi32;
209 irqh->hitIllegal = GBAIllegal;
210 irqh->readCPSR = GBATestIRQ;
211 irqh->hitStub = GBAHitStub;
212}
213
214void GBAReset(struct ARMCore* cpu) {
215 ARMSetPrivilegeMode(cpu, MODE_IRQ);
216 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
217 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
218 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
219 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
220 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
221
222 struct GBA* gba = (struct GBA*) cpu->master;
223 if (!GBARRIsPlaying(gba->rr) && !GBARRIsRecording(gba->rr)) {
224 GBASavedataUnmask(&gba->memory.savedata);
225 }
226 GBAMemoryReset(gba);
227 GBAVideoReset(&gba->video);
228 GBAAudioReset(&gba->audio);
229 GBAIOInit(gba);
230
231 GBASIODeinit(&gba->sio);
232 GBASIOInit(&gba->sio);
233
234 gba->timersEnabled = 0;
235 memset(gba->timers, 0, sizeof(gba->timers));
236}
237
238void GBASkipBIOS(struct ARMCore* cpu) {
239 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
240 cpu->gprs[ARM_PC] = BASE_CART0;
241 int currentCycles = 0;
242 ARM_WRITE_PC;
243 }
244}
245
246static void GBAProcessEvents(struct ARMCore* cpu) {
247 do {
248 struct GBA* gba = (struct GBA*) cpu->master;
249 int32_t cycles = cpu->cycles;
250 int32_t nextEvent = INT_MAX;
251 int32_t testEvent;
252
253 gba->bus = cpu->prefetch[1];
254 if (cpu->executionMode == MODE_THUMB) {
255 gba->bus |= cpu->prefetch[1] << 16;
256 }
257
258 if (gba->springIRQ) {
259 ARMRaiseIRQ(cpu);
260 gba->springIRQ = 0;
261 }
262
263 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
264 if (testEvent < nextEvent) {
265 nextEvent = testEvent;
266 }
267
268 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
269 if (testEvent < nextEvent) {
270 nextEvent = testEvent;
271 }
272
273 testEvent = GBATimersProcessEvents(gba, cycles);
274 if (testEvent < nextEvent) {
275 nextEvent = testEvent;
276 }
277
278 testEvent = GBAMemoryRunDMAs(gba, cycles);
279 if (testEvent < nextEvent) {
280 nextEvent = testEvent;
281 }
282
283 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
284 if (testEvent < nextEvent) {
285 nextEvent = testEvent;
286 }
287
288 cpu->cycles -= cycles;
289 cpu->nextEvent = nextEvent;
290
291 if (cpu->halted) {
292 cpu->cycles = cpu->nextEvent;
293 }
294 } while (cpu->cycles >= cpu->nextEvent);
295}
296
297static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
298 int32_t nextEvent = INT_MAX;
299 if (gba->timersEnabled) {
300 struct GBATimer* timer;
301 struct GBATimer* nextTimer;
302
303 timer = &gba->timers[0];
304 if (timer->enable) {
305 timer->nextEvent -= cycles;
306 timer->lastEvent -= cycles;
307 if (timer->nextEvent <= 0) {
308 timer->lastEvent = timer->nextEvent;
309 timer->nextEvent += timer->overflowInterval;
310 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
311 timer->oldReload = timer->reload;
312
313 if (timer->doIrq) {
314 GBARaiseIRQ(gba, IRQ_TIMER0);
315 }
316
317 if (gba->audio.enable) {
318 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
319 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
320 }
321
322 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
323 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
324 }
325 }
326
327 nextTimer = &gba->timers[1];
328 if (nextTimer->countUp) {
329 ++gba->memory.io[REG_TM1CNT_LO >> 1];
330 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
331 nextTimer->nextEvent = 0;
332 }
333 }
334 }
335 nextEvent = timer->nextEvent;
336 }
337
338 timer = &gba->timers[1];
339 if (timer->enable) {
340 timer->nextEvent -= cycles;
341 timer->lastEvent -= cycles;
342 if (timer->nextEvent <= 0) {
343 timer->lastEvent = timer->nextEvent;
344 timer->nextEvent += timer->overflowInterval;
345 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
346 timer->oldReload = timer->reload;
347
348 if (timer->doIrq) {
349 GBARaiseIRQ(gba, IRQ_TIMER1);
350 }
351
352 if (gba->audio.enable) {
353 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
354 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
355 }
356
357 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
358 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
359 }
360 }
361
362 if (timer->countUp) {
363 timer->nextEvent = INT_MAX;
364 }
365
366 nextTimer = &gba->timers[2];
367 if (nextTimer->countUp) {
368 ++gba->memory.io[REG_TM2CNT_LO >> 1];
369 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
370 nextTimer->nextEvent = 0;
371 }
372 }
373 }
374 if (timer->nextEvent < nextEvent) {
375 nextEvent = timer->nextEvent;
376 }
377 }
378
379 timer = &gba->timers[2];
380 if (timer->enable) {
381 timer->nextEvent -= cycles;
382 timer->lastEvent -= cycles;
383 nextEvent = timer->nextEvent;
384 if (timer->nextEvent <= 0) {
385 timer->lastEvent = timer->nextEvent;
386 timer->nextEvent += timer->overflowInterval;
387 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
388 timer->oldReload = timer->reload;
389
390 if (timer->doIrq) {
391 GBARaiseIRQ(gba, IRQ_TIMER2);
392 }
393
394 if (timer->countUp) {
395 timer->nextEvent = INT_MAX;
396 }
397
398 nextTimer = &gba->timers[3];
399 if (nextTimer->countUp) {
400 ++gba->memory.io[REG_TM3CNT_LO >> 1];
401 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
402 nextTimer->nextEvent = 0;
403 }
404 }
405 }
406 if (timer->nextEvent < nextEvent) {
407 nextEvent = timer->nextEvent;
408 }
409 }
410
411 timer = &gba->timers[3];
412 if (timer->enable) {
413 timer->nextEvent -= cycles;
414 timer->lastEvent -= cycles;
415 nextEvent = timer->nextEvent;
416 if (timer->nextEvent <= 0) {
417 timer->lastEvent = timer->nextEvent;
418 timer->nextEvent += timer->overflowInterval;
419 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
420 timer->oldReload = timer->reload;
421
422 if (timer->doIrq) {
423 GBARaiseIRQ(gba, IRQ_TIMER3);
424 }
425
426 if (timer->countUp) {
427 timer->nextEvent = INT_MAX;
428 }
429 }
430 if (timer->nextEvent < nextEvent) {
431 nextEvent = timer->nextEvent;
432 }
433 }
434 }
435 return nextEvent;
436}
437
438void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
439 gba->debugger = debugger;
440 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = &debugger->d;
441 ARMHotplugAttach(gba->cpu, GBA_COMPONENT_DEBUGGER);
442}
443
444void GBADetachDebugger(struct GBA* gba) {
445 gba->debugger = 0;
446 ARMHotplugDetach(gba->cpu, GBA_COMPONENT_DEBUGGER);
447 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = 0;
448}
449
450void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
451 gba->romVf = vf;
452 gba->pristineRomSize = vf->seek(vf, 0, SEEK_END);
453 vf->seek(vf, 0, SEEK_SET);
454 if (gba->pristineRomSize > SIZE_CART0) {
455 gba->pristineRomSize = SIZE_CART0;
456 }
457 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
458 if (!gba->pristineRom) {
459 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
460 return;
461 }
462 gba->memory.rom = gba->pristineRom;
463 gba->activeFile = fname;
464 gba->memory.romSize = gba->pristineRomSize;
465 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
466 GBASavedataInit(&gba->memory.savedata, sav);
467 GBAGPIOInit(&gba->memory.gpio, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
468 _checkOverrides(gba, ((struct GBACartridge*) gba->memory.rom)->id);
469 // TODO: error check
470}
471
472void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
473 gba->biosVf = vf;
474 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
475 if (!bios) {
476 GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
477 return;
478 }
479 gba->memory.bios = bios;
480 gba->memory.fullBios = 1;
481 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
482 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
483 if (checksum == GBA_BIOS_CHECKSUM) {
484 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
485 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
486 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
487 } else {
488 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
489 }
490 gba->biosChecksum = checksum;
491 if (gba->memory.activeRegion == REGION_BIOS) {
492 gba->cpu->memory.activeRegion = gba->memory.bios;
493 }
494 // TODO: error check
495}
496
497void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
498 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
499 if (!patchedSize) {
500 return;
501 }
502 gba->memory.rom = anonymousMemoryMap(patchedSize);
503 memcpy(gba->memory.rom, gba->pristineRom, gba->memory.romSize > patchedSize ? patchedSize : gba->memory.romSize);
504 if (!patch->applyPatch(patch, gba->memory.rom, patchedSize)) {
505 mappedMemoryFree(gba->memory.rom, patchedSize);
506 gba->memory.rom = gba->pristineRom;
507 return;
508 }
509 gba->memory.romSize = patchedSize;
510 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
511}
512
513void GBATimerUpdateRegister(struct GBA* gba, int timer) {
514 struct GBATimer* currentTimer = &gba->timers[timer];
515 if (currentTimer->enable && !currentTimer->countUp) {
516 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
517 }
518}
519
520void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
521 gba->timers[timer].reload = reload;
522}
523
524void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
525 struct GBATimer* currentTimer = &gba->timers[timer];
526 GBATimerUpdateRegister(gba, timer);
527
528 int oldPrescale = currentTimer->prescaleBits;
529 switch (control & 0x0003) {
530 case 0x0000:
531 currentTimer->prescaleBits = 0;
532 break;
533 case 0x0001:
534 currentTimer->prescaleBits = 6;
535 break;
536 case 0x0002:
537 currentTimer->prescaleBits = 8;
538 break;
539 case 0x0003:
540 currentTimer->prescaleBits = 10;
541 break;
542 }
543 currentTimer->countUp = !!(control & 0x0004);
544 currentTimer->doIrq = !!(control & 0x0040);
545 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
546 int wasEnabled = currentTimer->enable;
547 currentTimer->enable = !!(control & 0x0080);
548 if (!wasEnabled && currentTimer->enable) {
549 if (!currentTimer->countUp) {
550 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
551 } else {
552 currentTimer->nextEvent = INT_MAX;
553 }
554 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
555 currentTimer->oldReload = currentTimer->reload;
556 currentTimer->lastEvent = 0;
557 gba->timersEnabled |= 1 << timer;
558 } else if (wasEnabled && !currentTimer->enable) {
559 if (!currentTimer->countUp) {
560 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
561 }
562 gba->timersEnabled &= ~(1 << timer);
563 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
564 // FIXME: this might be before present
565 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
566 }
567
568 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
569 gba->cpu->nextEvent = currentTimer->nextEvent;
570 }
571};
572
573void GBAWriteIE(struct GBA* gba, uint16_t value) {
574 if (value & (1 << IRQ_KEYPAD)) {
575 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
576 }
577
578 if (value & (1 << IRQ_GAMEPAK)) {
579 GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
580 }
581
582 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
583 ARMRaiseIRQ(gba->cpu);
584 }
585}
586
587void GBAWriteIME(struct GBA* gba, uint16_t value) {
588 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
589 ARMRaiseIRQ(gba->cpu);
590 }
591}
592
593void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
594 gba->memory.io[REG_IF >> 1] |= 1 << irq;
595 gba->cpu->halted = 0;
596
597 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
598 ARMRaiseIRQ(gba->cpu);
599 }
600}
601
602void GBATestIRQ(struct ARMCore* cpu) {
603 struct GBA* gba = (struct GBA*) cpu->master;
604 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
605 gba->springIRQ = 1;
606 gba->cpu->nextEvent = 0;
607 }
608}
609
610void GBAHalt(struct GBA* gba) {
611 gba->cpu->nextEvent = 0;
612 gba->cpu->halted = 1;
613}
614
615static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
616 struct GBAThread* threadContext = GBAThreadGetContext();
617 enum GBALogLevel logLevel = -1;
618
619 if (gba) {
620 logLevel = gba->logLevel;
621 }
622
623 if (threadContext) {
624 logLevel = threadContext->logLevel;
625 gba = threadContext->gba;
626 }
627
628 if (!(level & logLevel) && level != GBA_LOG_FATAL) {
629 return;
630 }
631
632 if (level == GBA_LOG_FATAL && gba) {
633 gba->cpu->nextEvent = 0;
634 }
635
636 if (threadContext) {
637 if (level == GBA_LOG_FATAL) {
638 MutexLock(&threadContext->stateMutex);
639 threadContext->state = THREAD_CRASHED;
640 MutexUnlock(&threadContext->stateMutex);
641 }
642 if (threadContext->logHandler) {
643 threadContext->logHandler(threadContext, level, format, args);
644 return;
645 }
646 }
647
648 vprintf(format, args);
649 printf("\n");
650
651 if (level == GBA_LOG_FATAL && !threadContext) {
652 abort();
653 }
654}
655
656void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
657 va_list args;
658 va_start(args, format);
659 _GBAVLog(gba, level, format, args);
660 va_end(args);
661}
662
663void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
664 struct GBA* gba = 0;
665 if (debugger->cpu) {
666 gba = (struct GBA*) debugger->cpu->master;
667 }
668
669 enum GBALogLevel gbaLevel;
670 switch (level) {
671 default: // Avoids compiler warning
672 case DEBUGGER_LOG_DEBUG:
673 gbaLevel = GBA_LOG_DEBUG;
674 break;
675 case DEBUGGER_LOG_INFO:
676 gbaLevel = GBA_LOG_INFO;
677 break;
678 case DEBUGGER_LOG_WARN:
679 gbaLevel = GBA_LOG_WARN;
680 break;
681 case DEBUGGER_LOG_ERROR:
682 gbaLevel = GBA_LOG_ERROR;
683 break;
684 }
685 va_list args;
686 va_start(args, format);
687 _GBAVLog(gba, gbaLevel, format, args);
688 va_end(args);
689}
690
691bool GBAIsROM(struct VFile* vf) {
692 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
693 return false;
694 }
695 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
696 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
697 return false;
698 }
699 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
700}
701
702bool GBAIsBIOS(struct VFile* vf) {
703 if (vf->seek(vf, 0, SEEK_SET) < 0) {
704 return false;
705 }
706 uint32_t interruptTable[7];
707 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
708 return false;
709 }
710 int i;
711 for (i = 0; i < 7; ++i) {
712 if ((interruptTable[i] & 0xFFFF0000) != 0xEA000000) {
713 return false;
714 }
715 }
716 return true;
717}
718
719void GBAGetGameCode(struct GBA* gba, char* out) {
720 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
721}
722
723void GBAGetGameTitle(struct GBA* gba, char* out) {
724 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
725}
726
727void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
728 struct GBA* gba = (struct GBA*) cpu->master;
729 enum GBALogLevel level = GBA_LOG_FATAL;
730 if (gba->debugger) {
731 level = GBA_LOG_STUB;
732 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
733 }
734 GBALog(gba, level, "Stub opcode: %08x", opcode);
735}
736
737void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
738 struct GBA* gba = (struct GBA*) cpu->master;
739 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
740 if (gba->debugger) {
741 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
742 }
743}
744
745void _checkOverrides(struct GBA* gba, uint32_t id) {
746 int i;
747 gba->busyLoop = -1;
748 if ((id & 0xFF) == 'F') {
749 GBALog(gba, GBA_LOG_DEBUG, "Found Classic NES Series game, using EEPROM saves");
750 GBASavedataInitEEPROM(&gba->memory.savedata);
751 return;
752 }
753 for (i = 0; _overrides[i].id[0]; ++i) {
754 const uint32_t* overrideId = (const uint32_t*) _overrides[i].id;
755 if (*overrideId == id) {
756 GBALog(gba, GBA_LOG_DEBUG, "Found override for game %s!", _overrides[i].id);
757 GBASavedataForceType(&gba->memory.savedata, _overrides[i].type);
758
759 if (_overrides[i].gpio & GPIO_RTC) {
760 GBAGPIOInitRTC(&gba->memory.gpio);
761 }
762
763 if (_overrides[i].gpio & GPIO_GYRO) {
764 GBAGPIOInitGyro(&gba->memory.gpio);
765 }
766
767 if (_overrides[i].gpio & GPIO_RUMBLE) {
768 GBAGPIOInitRumble(&gba->memory.gpio);
769 }
770
771 if (_overrides[i].gpio & GPIO_LIGHT_SENSOR) {
772 GBAGPIOInitLightSensor(&gba->memory.gpio);
773 }
774
775 if (_overrides[i].gpio & GPIO_TILT) {
776 GBAGPIOInitTilt(&gba->memory.gpio);
777 }
778
779 gba->busyLoop = _overrides[i].busyLoop;
780 return;
781 }
782 }
783}