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 { "U3IJ", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
37 { "U3IE", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
38 { "U3IP", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
39
40 // Boktai 2: Solar Boy Django
41 { "U32J", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
42 { "U32E", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
43 { "U32P", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
44
45 // Drill Dozer
46 { "V49J", SAVEDATA_SRAM, GPIO_RUMBLE, -1 },
47 { "V49E", SAVEDATA_SRAM, GPIO_RUMBLE, -1 },
48
49 // Final Fantasy Tactics Advance
50 { "AFXE", SAVEDATA_FLASH512, GPIO_NONE, 0x8000418 },
51
52 // Koro Koro Puzzle - Happy Panechu!
53 { "KHPJ", SAVEDATA_EEPROM, GPIO_TILT, -1 },
54
55 // Mega Man Battle Network
56 { "AREE", SAVEDATA_SRAM, GPIO_NONE, 0x800032E },
57
58 // Pokemon Ruby
59 { "AXVJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
60 { "AXVE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
61 { "AXVP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
62 { "AXVI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
63 { "AXVS", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
64 { "AXVD", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
65 { "AXVF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
66
67 // Pokemon Sapphire
68 { "AXPJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
69 { "AXPE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
70 { "AXPP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
71 { "AXPI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
72 { "AXPS", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
73 { "AXPD", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
74 { "AXPF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
75
76 // Pokemon Emerald
77 { "BPEJ", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
78 { "BPEE", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
79 { "BPEP", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
80 { "BPEI", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
81 { "BPES", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
82 { "BPED", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
83 { "BPEF", SAVEDATA_FLASH1M, GPIO_RTC, -1 },
84
85 // Pokemon Mystery Dungeon
86 { "B24J", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
87 { "B24E", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
88 { "B24P", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
89 { "B24U", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
90
91 // Pokemon FireRed
92 { "BPRJ", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
93 { "BPRE", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
94 { "BPRP", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
95
96 // Pokemon LeafGreen
97 { "BPGJ", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
98 { "BPGE", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
99 { "BPGP", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
100
101 // RockMan EXE 4.5 - Real Operation
102 { "BR4J", SAVEDATA_FLASH512, GPIO_RTC, -1 },
103
104 // Shin Bokura no Taiyou: Gyakushuu no Sabata
105 { "U33J", SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR, -1 },
106
107 // Super Mario Advance 4
108 { "AX4J", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
109 { "AX4E", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
110 { "AX4P", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
111
112 // Top Gun - Combat Zones
113 { "A2YE", SAVEDATA_FORCE_NONE, GPIO_NONE, -1 },
114
115 // Wario Ware Twisted
116 { "RZWJ", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
117 { "RZWE", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
118 { "RZWP", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
119
120 // Yoshi's Universal Gravitation
121 { "KYGJ", SAVEDATA_EEPROM, GPIO_TILT, -1 },
122 { "KYGE", SAVEDATA_EEPROM, GPIO_TILT, -1 },
123 { "KYGP", SAVEDATA_EEPROM, GPIO_TILT, -1 },
124
125 { { 0, 0, 0, 0 }, 0, 0, -1 }
126};
127
128static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component);
129static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
130static void GBAProcessEvents(struct ARMCore* cpu);
131static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
132static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
133static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
134
135static void _checkOverrides(struct GBA* gba, uint32_t code);
136
137void GBACreate(struct GBA* gba) {
138 gba->d.id = GBA_COMPONENT_MAGIC;
139 gba->d.init = GBAInit;
140 gba->d.deinit = 0;
141}
142
143static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component) {
144 struct GBA* gba = (struct GBA*) component;
145 gba->cpu = cpu;
146 gba->debugger = 0;
147
148 GBAInterruptHandlerInit(&cpu->irqh);
149 GBAMemoryInit(gba);
150 GBASavedataInit(&gba->memory.savedata, 0);
151
152 gba->video.p = gba;
153 GBAVideoInit(&gba->video);
154
155 gba->audio.p = gba;
156 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
157
158 GBAIOInit(gba);
159
160 gba->sio.p = gba;
161 GBASIOInit(&gba->sio);
162
163 gba->timersEnabled = 0;
164 memset(gba->timers, 0, sizeof(gba->timers));
165
166 gba->springIRQ = 0;
167 gba->keySource = 0;
168 gba->rotationSource = 0;
169 gba->luminanceSource = 0;
170 gba->rtcSource = 0;
171 gba->rumble = 0;
172 gba->rr = 0;
173
174 gba->romVf = 0;
175 gba->biosVf = 0;
176
177 gba->logLevel = GBA_LOG_INFO | GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
178
179 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
180
181 gba->busyLoop = -1;
182}
183
184void GBADestroy(struct GBA* gba) {
185 if (gba->pristineRom == gba->memory.rom) {
186 gba->memory.rom = 0;
187 }
188
189 if (gba->romVf) {
190 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
191 }
192
193 if (gba->biosVf) {
194 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
195 }
196
197 GBAMemoryDeinit(gba);
198 GBAVideoDeinit(&gba->video);
199 GBAAudioDeinit(&gba->audio);
200 GBARRContextDestroy(gba);
201}
202
203void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
204 irqh->reset = GBAReset;
205 irqh->processEvents = GBAProcessEvents;
206 irqh->swi16 = GBASwi16;
207 irqh->swi32 = GBASwi32;
208 irqh->hitIllegal = GBAIllegal;
209 irqh->readCPSR = GBATestIRQ;
210 irqh->hitStub = GBAHitStub;
211}
212
213void GBAReset(struct ARMCore* cpu) {
214 ARMSetPrivilegeMode(cpu, MODE_IRQ);
215 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
216 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
217 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
218 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
219 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
220
221 struct GBA* gba = (struct GBA*) cpu->master;
222 if (!GBARRIsPlaying(gba->rr) && !GBARRIsRecording(gba->rr)) {
223 GBASavedataUnmask(&gba->memory.savedata);
224 }
225 GBAMemoryReset(gba);
226 GBAVideoReset(&gba->video);
227 GBAAudioReset(&gba->audio);
228 GBAIOInit(gba);
229
230 GBASIODeinit(&gba->sio);
231 GBASIOInit(&gba->sio);
232
233 gba->timersEnabled = 0;
234 memset(gba->timers, 0, sizeof(gba->timers));
235}
236
237void GBASkipBIOS(struct ARMCore* cpu) {
238 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
239 cpu->gprs[ARM_PC] = BASE_CART0;
240 int currentCycles = 0;
241 ARM_WRITE_PC;
242 }
243}
244
245static void GBAProcessEvents(struct ARMCore* cpu) {
246 do {
247 struct GBA* gba = (struct GBA*) cpu->master;
248 int32_t cycles = cpu->cycles;
249 int32_t nextEvent = INT_MAX;
250 int32_t testEvent;
251
252 gba->bus = cpu->prefetch[1];
253 if (cpu->executionMode == MODE_THUMB) {
254 gba->bus |= cpu->prefetch[1] << 16;
255 }
256
257 if (gba->springIRQ) {
258 ARMRaiseIRQ(cpu);
259 gba->springIRQ = 0;
260 }
261
262 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
263 if (testEvent < nextEvent) {
264 nextEvent = testEvent;
265 }
266
267 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
268 if (testEvent < nextEvent) {
269 nextEvent = testEvent;
270 }
271
272 testEvent = GBATimersProcessEvents(gba, cycles);
273 if (testEvent < nextEvent) {
274 nextEvent = testEvent;
275 }
276
277 testEvent = GBAMemoryRunDMAs(gba, cycles);
278 if (testEvent < nextEvent) {
279 nextEvent = testEvent;
280 }
281
282 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
283 if (testEvent < nextEvent) {
284 nextEvent = testEvent;
285 }
286
287 cpu->cycles -= cycles;
288 cpu->nextEvent = nextEvent;
289
290 if (cpu->halted) {
291 cpu->cycles = cpu->nextEvent;
292 }
293 } while (cpu->cycles >= cpu->nextEvent);
294}
295
296static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
297 int32_t nextEvent = INT_MAX;
298 if (gba->timersEnabled) {
299 struct GBATimer* timer;
300 struct GBATimer* nextTimer;
301
302 timer = &gba->timers[0];
303 if (timer->enable) {
304 timer->nextEvent -= cycles;
305 timer->lastEvent -= cycles;
306 if (timer->nextEvent <= 0) {
307 timer->lastEvent = timer->nextEvent;
308 timer->nextEvent += timer->overflowInterval;
309 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
310 timer->oldReload = timer->reload;
311
312 if (timer->doIrq) {
313 GBARaiseIRQ(gba, IRQ_TIMER0);
314 }
315
316 if (gba->audio.enable) {
317 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
318 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
319 }
320
321 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
322 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
323 }
324 }
325
326 nextTimer = &gba->timers[1];
327 if (nextTimer->countUp) {
328 ++gba->memory.io[REG_TM1CNT_LO >> 1];
329 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
330 nextTimer->nextEvent = 0;
331 }
332 }
333 }
334 nextEvent = timer->nextEvent;
335 }
336
337 timer = &gba->timers[1];
338 if (timer->enable) {
339 timer->nextEvent -= cycles;
340 timer->lastEvent -= cycles;
341 if (timer->nextEvent <= 0) {
342 timer->lastEvent = timer->nextEvent;
343 timer->nextEvent += timer->overflowInterval;
344 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
345 timer->oldReload = timer->reload;
346
347 if (timer->doIrq) {
348 GBARaiseIRQ(gba, IRQ_TIMER1);
349 }
350
351 if (gba->audio.enable) {
352 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
353 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
354 }
355
356 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
357 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
358 }
359 }
360
361 if (timer->countUp) {
362 timer->nextEvent = INT_MAX;
363 }
364
365 nextTimer = &gba->timers[2];
366 if (nextTimer->countUp) {
367 ++gba->memory.io[REG_TM2CNT_LO >> 1];
368 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
369 nextTimer->nextEvent = 0;
370 }
371 }
372 }
373 if (timer->nextEvent < nextEvent) {
374 nextEvent = timer->nextEvent;
375 }
376 }
377
378 timer = &gba->timers[2];
379 if (timer->enable) {
380 timer->nextEvent -= cycles;
381 timer->lastEvent -= cycles;
382 nextEvent = timer->nextEvent;
383 if (timer->nextEvent <= 0) {
384 timer->lastEvent = timer->nextEvent;
385 timer->nextEvent += timer->overflowInterval;
386 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
387 timer->oldReload = timer->reload;
388
389 if (timer->doIrq) {
390 GBARaiseIRQ(gba, IRQ_TIMER2);
391 }
392
393 if (timer->countUp) {
394 timer->nextEvent = INT_MAX;
395 }
396
397 nextTimer = &gba->timers[3];
398 if (nextTimer->countUp) {
399 ++gba->memory.io[REG_TM3CNT_LO >> 1];
400 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
401 nextTimer->nextEvent = 0;
402 }
403 }
404 }
405 if (timer->nextEvent < nextEvent) {
406 nextEvent = timer->nextEvent;
407 }
408 }
409
410 timer = &gba->timers[3];
411 if (timer->enable) {
412 timer->nextEvent -= cycles;
413 timer->lastEvent -= cycles;
414 nextEvent = timer->nextEvent;
415 if (timer->nextEvent <= 0) {
416 timer->lastEvent = timer->nextEvent;
417 timer->nextEvent += timer->overflowInterval;
418 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
419 timer->oldReload = timer->reload;
420
421 if (timer->doIrq) {
422 GBARaiseIRQ(gba, IRQ_TIMER3);
423 }
424
425 if (timer->countUp) {
426 timer->nextEvent = INT_MAX;
427 }
428 }
429 if (timer->nextEvent < nextEvent) {
430 nextEvent = timer->nextEvent;
431 }
432 }
433 }
434 return nextEvent;
435}
436
437void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
438 gba->debugger = debugger;
439 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = &debugger->d;
440 ARMHotplugAttach(gba->cpu, GBA_COMPONENT_DEBUGGER);
441}
442
443void GBADetachDebugger(struct GBA* gba) {
444 gba->debugger = 0;
445 ARMHotplugDetach(gba->cpu, GBA_COMPONENT_DEBUGGER);
446 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = 0;
447}
448
449void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
450 gba->romVf = vf;
451 gba->pristineRomSize = vf->size(vf);
452 vf->seek(vf, 0, SEEK_SET);
453 if (gba->pristineRomSize > SIZE_CART0) {
454 gba->pristineRomSize = SIZE_CART0;
455 }
456 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
457 if (!gba->pristineRom) {
458 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
459 return;
460 }
461 gba->memory.rom = gba->pristineRom;
462 gba->activeFile = fname;
463 gba->memory.romSize = gba->pristineRomSize;
464 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
465 GBASavedataInit(&gba->memory.savedata, sav);
466 GBAGPIOInit(&gba->memory.gpio, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
467 _checkOverrides(gba, ((struct GBACartridge*) gba->memory.rom)->id);
468 // TODO: error check
469}
470
471void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
472 gba->biosVf = vf;
473 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
474 if (!bios) {
475 GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
476 return;
477 }
478 gba->memory.bios = bios;
479 gba->memory.fullBios = 1;
480 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
481 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
482 if (checksum == GBA_BIOS_CHECKSUM) {
483 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
484 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
485 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
486 } else {
487 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
488 }
489 gba->biosChecksum = checksum;
490 if (gba->memory.activeRegion == REGION_BIOS) {
491 gba->cpu->memory.activeRegion = gba->memory.bios;
492 }
493 // TODO: error check
494}
495
496void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
497 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
498 if (!patchedSize) {
499 return;
500 }
501 gba->memory.rom = anonymousMemoryMap(patchedSize);
502 if (!patch->applyPatch(patch, gba->pristineRom, gba->pristineRomSize, gba->memory.rom, patchedSize)) {
503 mappedMemoryFree(gba->memory.rom, patchedSize);
504 gba->memory.rom = gba->pristineRom;
505 return;
506 }
507 gba->memory.romSize = patchedSize;
508 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
509}
510
511void GBATimerUpdateRegister(struct GBA* gba, int timer) {
512 struct GBATimer* currentTimer = &gba->timers[timer];
513 if (currentTimer->enable && !currentTimer->countUp) {
514 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
515 }
516}
517
518void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
519 gba->timers[timer].reload = reload;
520}
521
522void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
523 struct GBATimer* currentTimer = &gba->timers[timer];
524 GBATimerUpdateRegister(gba, timer);
525
526 int oldPrescale = currentTimer->prescaleBits;
527 switch (control & 0x0003) {
528 case 0x0000:
529 currentTimer->prescaleBits = 0;
530 break;
531 case 0x0001:
532 currentTimer->prescaleBits = 6;
533 break;
534 case 0x0002:
535 currentTimer->prescaleBits = 8;
536 break;
537 case 0x0003:
538 currentTimer->prescaleBits = 10;
539 break;
540 }
541 currentTimer->countUp = !!(control & 0x0004);
542 currentTimer->doIrq = !!(control & 0x0040);
543 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
544 int wasEnabled = currentTimer->enable;
545 currentTimer->enable = !!(control & 0x0080);
546 if (!wasEnabled && currentTimer->enable) {
547 if (!currentTimer->countUp) {
548 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
549 } else {
550 currentTimer->nextEvent = INT_MAX;
551 }
552 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
553 currentTimer->oldReload = currentTimer->reload;
554 currentTimer->lastEvent = 0;
555 gba->timersEnabled |= 1 << timer;
556 } else if (wasEnabled && !currentTimer->enable) {
557 if (!currentTimer->countUp) {
558 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
559 }
560 gba->timersEnabled &= ~(1 << timer);
561 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
562 // FIXME: this might be before present
563 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
564 }
565
566 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
567 gba->cpu->nextEvent = currentTimer->nextEvent;
568 }
569};
570
571void GBAWriteIE(struct GBA* gba, uint16_t value) {
572 if (value & (1 << IRQ_KEYPAD)) {
573 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
574 }
575
576 if (value & (1 << IRQ_GAMEPAK)) {
577 GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
578 }
579
580 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
581 ARMRaiseIRQ(gba->cpu);
582 }
583}
584
585void GBAWriteIME(struct GBA* gba, uint16_t value) {
586 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
587 ARMRaiseIRQ(gba->cpu);
588 }
589}
590
591void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
592 gba->memory.io[REG_IF >> 1] |= 1 << irq;
593 gba->cpu->halted = 0;
594
595 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
596 ARMRaiseIRQ(gba->cpu);
597 }
598}
599
600void GBATestIRQ(struct ARMCore* cpu) {
601 struct GBA* gba = (struct GBA*) cpu->master;
602 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
603 gba->springIRQ = 1;
604 gba->cpu->nextEvent = 0;
605 }
606}
607
608void GBAHalt(struct GBA* gba) {
609 gba->cpu->nextEvent = 0;
610 gba->cpu->halted = 1;
611}
612
613static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
614 struct GBAThread* threadContext = GBAThreadGetContext();
615 enum GBALogLevel logLevel = -1;
616
617 if (gba) {
618 logLevel = gba->logLevel;
619 }
620
621 if (threadContext) {
622 logLevel = threadContext->logLevel;
623 gba = threadContext->gba;
624 }
625
626 if (!(level & logLevel) && level != GBA_LOG_FATAL) {
627 return;
628 }
629
630 if (level == GBA_LOG_FATAL && gba) {
631 gba->cpu->nextEvent = 0;
632 }
633
634 if (threadContext) {
635 if (level == GBA_LOG_FATAL) {
636 MutexLock(&threadContext->stateMutex);
637 threadContext->state = THREAD_CRASHED;
638 MutexUnlock(&threadContext->stateMutex);
639 }
640 if (threadContext->logHandler) {
641 threadContext->logHandler(threadContext, level, format, args);
642 return;
643 }
644 }
645
646 vprintf(format, args);
647 printf("\n");
648
649 if (level == GBA_LOG_FATAL && !threadContext) {
650 abort();
651 }
652}
653
654void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
655 va_list args;
656 va_start(args, format);
657 _GBAVLog(gba, level, format, args);
658 va_end(args);
659}
660
661void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
662 struct GBA* gba = 0;
663 if (debugger->cpu) {
664 gba = (struct GBA*) debugger->cpu->master;
665 }
666
667 enum GBALogLevel gbaLevel;
668 switch (level) {
669 default: // Avoids compiler warning
670 case DEBUGGER_LOG_DEBUG:
671 gbaLevel = GBA_LOG_DEBUG;
672 break;
673 case DEBUGGER_LOG_INFO:
674 gbaLevel = GBA_LOG_INFO;
675 break;
676 case DEBUGGER_LOG_WARN:
677 gbaLevel = GBA_LOG_WARN;
678 break;
679 case DEBUGGER_LOG_ERROR:
680 gbaLevel = GBA_LOG_ERROR;
681 break;
682 }
683 va_list args;
684 va_start(args, format);
685 _GBAVLog(gba, gbaLevel, format, args);
686 va_end(args);
687}
688
689bool GBAIsROM(struct VFile* vf) {
690 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
691 return false;
692 }
693 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
694 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
695 return false;
696 }
697 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
698}
699
700bool GBAIsBIOS(struct VFile* vf) {
701 if (vf->seek(vf, 0, SEEK_SET) < 0) {
702 return false;
703 }
704 uint32_t interruptTable[7];
705 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
706 return false;
707 }
708 int i;
709 for (i = 0; i < 7; ++i) {
710 if ((interruptTable[i] & 0xFFFF0000) != 0xEA000000) {
711 return false;
712 }
713 }
714 return true;
715}
716
717void GBAGetGameCode(struct GBA* gba, char* out) {
718 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
719}
720
721void GBAGetGameTitle(struct GBA* gba, char* out) {
722 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
723}
724
725void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
726 struct GBA* gba = (struct GBA*) cpu->master;
727 enum GBALogLevel level = GBA_LOG_FATAL;
728 if (gba->debugger) {
729 level = GBA_LOG_STUB;
730 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
731 }
732 GBALog(gba, level, "Stub opcode: %08x", opcode);
733}
734
735void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
736 struct GBA* gba = (struct GBA*) cpu->master;
737 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
738 if (gba->debugger) {
739 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
740 }
741}
742
743void _checkOverrides(struct GBA* gba, uint32_t id) {
744 int i;
745 gba->busyLoop = -1;
746 if ((id & 0xFF) == 'F') {
747 GBALog(gba, GBA_LOG_DEBUG, "Found Classic NES Series game, using EEPROM saves");
748 GBASavedataInitEEPROM(&gba->memory.savedata);
749 return;
750 }
751 for (i = 0; _overrides[i].id[0]; ++i) {
752 const uint32_t* overrideId = (const uint32_t*) _overrides[i].id;
753 if (*overrideId == id) {
754 GBALog(gba, GBA_LOG_DEBUG, "Found override for game %s!", _overrides[i].id);
755 GBASavedataForceType(&gba->memory.savedata, _overrides[i].type);
756
757 if (_overrides[i].gpio & GPIO_RTC) {
758 GBAGPIOInitRTC(&gba->memory.gpio);
759 }
760
761 if (_overrides[i].gpio & GPIO_GYRO) {
762 GBAGPIOInitGyro(&gba->memory.gpio);
763 }
764
765 if (_overrides[i].gpio & GPIO_RUMBLE) {
766 GBAGPIOInitRumble(&gba->memory.gpio);
767 }
768
769 if (_overrides[i].gpio & GPIO_LIGHT_SENSOR) {
770 GBAGPIOInitLightSensor(&gba->memory.gpio);
771 }
772
773 if (_overrides[i].gpio & GPIO_TILT) {
774 GBAGPIOInitTilt(&gba->memory.gpio);
775 }
776
777 gba->busyLoop = _overrides[i].busyLoop;
778 return;
779 }
780 }
781}