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 3
112 { "A3AE", SAVEDATA_EEPROM, GPIO_NONE, 0x8002B9C },
113
114 // Super Mario Advance 4
115 { "AX4J", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
116 { "AX4E", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
117 { "AX4P", SAVEDATA_FLASH1M, GPIO_NONE, -1 },
118
119 // Wario Ware Twisted
120 { "RZWJ", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
121 { "RZWE", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
122 { "RZWP", SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO, -1 },
123
124 // Yoshi's Universal Gravitation
125 { "KYGJ", SAVEDATA_EEPROM, GPIO_TILT, -1 },
126 { "KYGE", SAVEDATA_EEPROM, GPIO_TILT, -1 },
127 { "KYGP", SAVEDATA_EEPROM, GPIO_TILT, -1 },
128
129 { { 0, 0, 0, 0 }, 0, 0, -1 }
130};
131
132static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component);
133static void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh);
134static void GBAProcessEvents(struct ARMCore* cpu);
135static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
136static void GBAHitStub(struct ARMCore* cpu, uint32_t opcode);
137static void GBAIllegal(struct ARMCore* cpu, uint32_t opcode);
138
139static void _checkOverrides(struct GBA* gba, uint32_t code);
140
141void GBACreate(struct GBA* gba) {
142 gba->d.id = GBA_COMPONENT_MAGIC;
143 gba->d.init = GBAInit;
144 gba->d.deinit = 0;
145}
146
147static void GBAInit(struct ARMCore* cpu, struct ARMComponent* component) {
148 struct GBA* gba = (struct GBA*) component;
149 gba->cpu = cpu;
150 gba->debugger = 0;
151
152 GBAInterruptHandlerInit(&cpu->irqh);
153 GBAMemoryInit(gba);
154 GBASavedataInit(&gba->memory.savedata, 0);
155
156 gba->video.p = gba;
157 GBAVideoInit(&gba->video);
158
159 gba->audio.p = gba;
160 GBAAudioInit(&gba->audio, GBA_AUDIO_SAMPLES);
161
162 GBAIOInit(gba);
163
164 gba->sio.p = gba;
165 GBASIOInit(&gba->sio);
166
167 gba->timersEnabled = 0;
168 memset(gba->timers, 0, sizeof(gba->timers));
169
170 gba->springIRQ = 0;
171 gba->keySource = 0;
172 gba->rotationSource = 0;
173 gba->luminanceSource = 0;
174 gba->rtcSource = 0;
175 gba->rumble = 0;
176 gba->rr = 0;
177
178 gba->romVf = 0;
179 gba->biosVf = 0;
180
181 gba->logLevel = GBA_LOG_INFO | GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL;
182
183 gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
184
185 gba->busyLoop = -1;
186}
187
188void GBADestroy(struct GBA* gba) {
189 if (gba->pristineRom == gba->memory.rom) {
190 gba->memory.rom = 0;
191 }
192
193 if (gba->romVf) {
194 gba->romVf->unmap(gba->romVf, gba->pristineRom, gba->pristineRomSize);
195 }
196
197 if (gba->biosVf) {
198 gba->biosVf->unmap(gba->biosVf, gba->memory.bios, SIZE_BIOS);
199 }
200
201 GBAMemoryDeinit(gba);
202 GBAVideoDeinit(&gba->video);
203 GBAAudioDeinit(&gba->audio);
204 GBARRContextDestroy(gba);
205}
206
207void GBAInterruptHandlerInit(struct ARMInterruptHandler* irqh) {
208 irqh->reset = GBAReset;
209 irqh->processEvents = GBAProcessEvents;
210 irqh->swi16 = GBASwi16;
211 irqh->swi32 = GBASwi32;
212 irqh->hitIllegal = GBAIllegal;
213 irqh->readCPSR = GBATestIRQ;
214 irqh->hitStub = GBAHitStub;
215}
216
217void GBAReset(struct ARMCore* cpu) {
218 ARMSetPrivilegeMode(cpu, MODE_IRQ);
219 cpu->gprs[ARM_SP] = SP_BASE_IRQ;
220 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
221 cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
222 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
223 cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
224
225 struct GBA* gba = (struct GBA*) cpu->master;
226 if (!GBARRIsPlaying(gba->rr) && !GBARRIsRecording(gba->rr)) {
227 GBASavedataUnmask(&gba->memory.savedata);
228 }
229 GBAMemoryReset(gba);
230 GBAVideoReset(&gba->video);
231 GBAAudioReset(&gba->audio);
232 GBAIOInit(gba);
233
234 GBASIODeinit(&gba->sio);
235 GBASIOInit(&gba->sio);
236
237 gba->timersEnabled = 0;
238 memset(gba->timers, 0, sizeof(gba->timers));
239}
240
241void GBASkipBIOS(struct ARMCore* cpu) {
242 if (cpu->gprs[ARM_PC] == BASE_RESET + WORD_SIZE_ARM) {
243 cpu->gprs[ARM_PC] = BASE_CART0;
244 int currentCycles = 0;
245 ARM_WRITE_PC;
246 }
247}
248
249static void GBAProcessEvents(struct ARMCore* cpu) {
250 do {
251 struct GBA* gba = (struct GBA*) cpu->master;
252 int32_t cycles = cpu->cycles;
253 int32_t nextEvent = INT_MAX;
254 int32_t testEvent;
255
256 gba->bus = cpu->prefetch[1];
257 if (cpu->executionMode == MODE_THUMB) {
258 gba->bus |= cpu->prefetch[1] << 16;
259 }
260
261 if (gba->springIRQ) {
262 ARMRaiseIRQ(cpu);
263 gba->springIRQ = 0;
264 }
265
266 testEvent = GBAVideoProcessEvents(&gba->video, cycles);
267 if (testEvent < nextEvent) {
268 nextEvent = testEvent;
269 }
270
271 testEvent = GBAAudioProcessEvents(&gba->audio, cycles);
272 if (testEvent < nextEvent) {
273 nextEvent = testEvent;
274 }
275
276 testEvent = GBATimersProcessEvents(gba, cycles);
277 if (testEvent < nextEvent) {
278 nextEvent = testEvent;
279 }
280
281 testEvent = GBAMemoryRunDMAs(gba, cycles);
282 if (testEvent < nextEvent) {
283 nextEvent = testEvent;
284 }
285
286 testEvent = GBASIOProcessEvents(&gba->sio, cycles);
287 if (testEvent < nextEvent) {
288 nextEvent = testEvent;
289 }
290
291 cpu->cycles -= cycles;
292 cpu->nextEvent = nextEvent;
293
294 if (cpu->halted) {
295 cpu->cycles = cpu->nextEvent;
296 }
297 } while (cpu->cycles >= cpu->nextEvent);
298}
299
300static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
301 int32_t nextEvent = INT_MAX;
302 if (gba->timersEnabled) {
303 struct GBATimer* timer;
304 struct GBATimer* nextTimer;
305
306 timer = &gba->timers[0];
307 if (timer->enable) {
308 timer->nextEvent -= cycles;
309 timer->lastEvent -= cycles;
310 if (timer->nextEvent <= 0) {
311 timer->lastEvent = timer->nextEvent;
312 timer->nextEvent += timer->overflowInterval;
313 gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
314 timer->oldReload = timer->reload;
315
316 if (timer->doIrq) {
317 GBARaiseIRQ(gba, IRQ_TIMER0);
318 }
319
320 if (gba->audio.enable) {
321 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
322 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
323 }
324
325 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
326 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
327 }
328 }
329
330 nextTimer = &gba->timers[1];
331 if (nextTimer->countUp) {
332 ++gba->memory.io[REG_TM1CNT_LO >> 1];
333 if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
334 nextTimer->nextEvent = 0;
335 }
336 }
337 }
338 nextEvent = timer->nextEvent;
339 }
340
341 timer = &gba->timers[1];
342 if (timer->enable) {
343 timer->nextEvent -= cycles;
344 timer->lastEvent -= cycles;
345 if (timer->nextEvent <= 0) {
346 timer->lastEvent = timer->nextEvent;
347 timer->nextEvent += timer->overflowInterval;
348 gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
349 timer->oldReload = timer->reload;
350
351 if (timer->doIrq) {
352 GBARaiseIRQ(gba, IRQ_TIMER1);
353 }
354
355 if (gba->audio.enable) {
356 if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
357 GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
358 }
359
360 if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
361 GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
362 }
363 }
364
365 if (timer->countUp) {
366 timer->nextEvent = INT_MAX;
367 }
368
369 nextTimer = &gba->timers[2];
370 if (nextTimer->countUp) {
371 ++gba->memory.io[REG_TM2CNT_LO >> 1];
372 if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
373 nextTimer->nextEvent = 0;
374 }
375 }
376 }
377 if (timer->nextEvent < nextEvent) {
378 nextEvent = timer->nextEvent;
379 }
380 }
381
382 timer = &gba->timers[2];
383 if (timer->enable) {
384 timer->nextEvent -= cycles;
385 timer->lastEvent -= cycles;
386 nextEvent = timer->nextEvent;
387 if (timer->nextEvent <= 0) {
388 timer->lastEvent = timer->nextEvent;
389 timer->nextEvent += timer->overflowInterval;
390 gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
391 timer->oldReload = timer->reload;
392
393 if (timer->doIrq) {
394 GBARaiseIRQ(gba, IRQ_TIMER2);
395 }
396
397 if (timer->countUp) {
398 timer->nextEvent = INT_MAX;
399 }
400
401 nextTimer = &gba->timers[3];
402 if (nextTimer->countUp) {
403 ++gba->memory.io[REG_TM3CNT_LO >> 1];
404 if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
405 nextTimer->nextEvent = 0;
406 }
407 }
408 }
409 if (timer->nextEvent < nextEvent) {
410 nextEvent = timer->nextEvent;
411 }
412 }
413
414 timer = &gba->timers[3];
415 if (timer->enable) {
416 timer->nextEvent -= cycles;
417 timer->lastEvent -= cycles;
418 nextEvent = timer->nextEvent;
419 if (timer->nextEvent <= 0) {
420 timer->lastEvent = timer->nextEvent;
421 timer->nextEvent += timer->overflowInterval;
422 gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
423 timer->oldReload = timer->reload;
424
425 if (timer->doIrq) {
426 GBARaiseIRQ(gba, IRQ_TIMER3);
427 }
428
429 if (timer->countUp) {
430 timer->nextEvent = INT_MAX;
431 }
432 }
433 if (timer->nextEvent < nextEvent) {
434 nextEvent = timer->nextEvent;
435 }
436 }
437 }
438 return nextEvent;
439}
440
441void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
442 gba->debugger = debugger;
443 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = &debugger->d;
444 ARMHotplugAttach(gba->cpu, GBA_COMPONENT_DEBUGGER);
445}
446
447void GBADetachDebugger(struct GBA* gba) {
448 gba->debugger = 0;
449 ARMHotplugDetach(gba->cpu, GBA_COMPONENT_DEBUGGER);
450 gba->cpu->components[GBA_COMPONENT_DEBUGGER] = 0;
451}
452
453void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char* fname) {
454 gba->romVf = vf;
455 gba->pristineRomSize = vf->seek(vf, 0, SEEK_END);
456 vf->seek(vf, 0, SEEK_SET);
457 if (gba->pristineRomSize > SIZE_CART0) {
458 gba->pristineRomSize = SIZE_CART0;
459 }
460 gba->pristineRom = vf->map(vf, gba->pristineRomSize, MAP_READ);
461 if (!gba->pristineRom) {
462 GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
463 return;
464 }
465 gba->memory.rom = gba->pristineRom;
466 gba->activeFile = fname;
467 gba->memory.romSize = gba->pristineRomSize;
468 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
469 GBASavedataInit(&gba->memory.savedata, sav);
470 GBAGPIOInit(&gba->memory.gpio, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
471 _checkOverrides(gba, ((struct GBACartridge*) gba->memory.rom)->id);
472 // TODO: error check
473}
474
475void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
476 gba->biosVf = vf;
477 uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
478 if (!bios) {
479 GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
480 return;
481 }
482 gba->memory.bios = bios;
483 gba->memory.fullBios = 1;
484 uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
485 GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
486 if (checksum == GBA_BIOS_CHECKSUM) {
487 GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
488 } else if (checksum == GBA_DS_BIOS_CHECKSUM) {
489 GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
490 } else {
491 GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
492 }
493 gba->biosChecksum = checksum;
494 if (gba->memory.activeRegion == REGION_BIOS) {
495 gba->cpu->memory.activeRegion = gba->memory.bios;
496 }
497 // TODO: error check
498}
499
500void GBAApplyPatch(struct GBA* gba, struct Patch* patch) {
501 size_t patchedSize = patch->outputSize(patch, gba->memory.romSize);
502 if (!patchedSize) {
503 return;
504 }
505 gba->memory.rom = anonymousMemoryMap(patchedSize);
506 memcpy(gba->memory.rom, gba->pristineRom, gba->memory.romSize > patchedSize ? patchedSize : gba->memory.romSize);
507 if (!patch->applyPatch(patch, gba->memory.rom, patchedSize)) {
508 mappedMemoryFree(gba->memory.rom, patchedSize);
509 gba->memory.rom = gba->pristineRom;
510 return;
511 }
512 gba->memory.romSize = patchedSize;
513 gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);
514}
515
516void GBATimerUpdateRegister(struct GBA* gba, int timer) {
517 struct GBATimer* currentTimer = &gba->timers[timer];
518 if (currentTimer->enable && !currentTimer->countUp) {
519 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
520 }
521}
522
523void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
524 gba->timers[timer].reload = reload;
525}
526
527void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
528 struct GBATimer* currentTimer = &gba->timers[timer];
529 GBATimerUpdateRegister(gba, timer);
530
531 int oldPrescale = currentTimer->prescaleBits;
532 switch (control & 0x0003) {
533 case 0x0000:
534 currentTimer->prescaleBits = 0;
535 break;
536 case 0x0001:
537 currentTimer->prescaleBits = 6;
538 break;
539 case 0x0002:
540 currentTimer->prescaleBits = 8;
541 break;
542 case 0x0003:
543 currentTimer->prescaleBits = 10;
544 break;
545 }
546 currentTimer->countUp = !!(control & 0x0004);
547 currentTimer->doIrq = !!(control & 0x0040);
548 currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
549 int wasEnabled = currentTimer->enable;
550 currentTimer->enable = !!(control & 0x0080);
551 if (!wasEnabled && currentTimer->enable) {
552 if (!currentTimer->countUp) {
553 currentTimer->nextEvent = gba->cpu->cycles + currentTimer->overflowInterval;
554 } else {
555 currentTimer->nextEvent = INT_MAX;
556 }
557 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
558 currentTimer->oldReload = currentTimer->reload;
559 currentTimer->lastEvent = 0;
560 gba->timersEnabled |= 1 << timer;
561 } else if (wasEnabled && !currentTimer->enable) {
562 if (!currentTimer->countUp) {
563 gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu->cycles - currentTimer->lastEvent) >> oldPrescale);
564 }
565 gba->timersEnabled &= ~(1 << timer);
566 } else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
567 // FIXME: this might be before present
568 currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
569 }
570
571 if (currentTimer->nextEvent < gba->cpu->nextEvent) {
572 gba->cpu->nextEvent = currentTimer->nextEvent;
573 }
574};
575
576void GBAWriteIE(struct GBA* gba, uint16_t value) {
577 if (value & (1 << IRQ_KEYPAD)) {
578 GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
579 }
580
581 if (value & (1 << IRQ_GAMEPAK)) {
582 GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
583 }
584
585 if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
586 ARMRaiseIRQ(gba->cpu);
587 }
588}
589
590void GBAWriteIME(struct GBA* gba, uint16_t value) {
591 if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
592 ARMRaiseIRQ(gba->cpu);
593 }
594}
595
596void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
597 gba->memory.io[REG_IF >> 1] |= 1 << irq;
598 gba->cpu->halted = 0;
599
600 if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
601 ARMRaiseIRQ(gba->cpu);
602 }
603}
604
605void GBATestIRQ(struct ARMCore* cpu) {
606 struct GBA* gba = (struct GBA*) cpu->master;
607 if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
608 gba->springIRQ = 1;
609 gba->cpu->nextEvent = 0;
610 }
611}
612
613void GBAHalt(struct GBA* gba) {
614 gba->cpu->nextEvent = 0;
615 gba->cpu->halted = 1;
616}
617
618static void _GBAVLog(struct GBA* gba, enum GBALogLevel level, const char* format, va_list args) {
619 struct GBAThread* threadContext = GBAThreadGetContext();
620 enum GBALogLevel logLevel = -1;
621
622 if (gba) {
623 logLevel = gba->logLevel;
624 }
625
626 if (threadContext) {
627 logLevel = threadContext->logLevel;
628 gba = threadContext->gba;
629 }
630
631 if (!(level & logLevel) && level != GBA_LOG_FATAL) {
632 return;
633 }
634
635 if (level == GBA_LOG_FATAL && gba) {
636 gba->cpu->nextEvent = 0;
637 }
638
639 if (threadContext) {
640 if (level == GBA_LOG_FATAL) {
641 MutexLock(&threadContext->stateMutex);
642 threadContext->state = THREAD_CRASHED;
643 MutexUnlock(&threadContext->stateMutex);
644 }
645 if (threadContext->logHandler) {
646 threadContext->logHandler(threadContext, level, format, args);
647 return;
648 }
649 }
650
651 vprintf(format, args);
652 printf("\n");
653
654 if (level == GBA_LOG_FATAL && !threadContext) {
655 abort();
656 }
657}
658
659void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
660 va_list args;
661 va_start(args, format);
662 _GBAVLog(gba, level, format, args);
663 va_end(args);
664}
665
666void GBADebuggerLogShim(struct ARMDebugger* debugger, enum DebuggerLogLevel level, const char* format, ...) {
667 struct GBA* gba = 0;
668 if (debugger->cpu) {
669 gba = (struct GBA*) debugger->cpu->master;
670 }
671
672 enum GBALogLevel gbaLevel;
673 switch (level) {
674 default: // Avoids compiler warning
675 case DEBUGGER_LOG_DEBUG:
676 gbaLevel = GBA_LOG_DEBUG;
677 break;
678 case DEBUGGER_LOG_INFO:
679 gbaLevel = GBA_LOG_INFO;
680 break;
681 case DEBUGGER_LOG_WARN:
682 gbaLevel = GBA_LOG_WARN;
683 break;
684 case DEBUGGER_LOG_ERROR:
685 gbaLevel = GBA_LOG_ERROR;
686 break;
687 }
688 va_list args;
689 va_start(args, format);
690 _GBAVLog(gba, gbaLevel, format, args);
691 va_end(args);
692}
693
694bool GBAIsROM(struct VFile* vf) {
695 if (vf->seek(vf, GBA_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
696 return false;
697 }
698 uint8_t signature[sizeof(GBA_ROM_MAGIC)];
699 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
700 return false;
701 }
702 return memcmp(signature, GBA_ROM_MAGIC, sizeof(signature)) == 0;
703}
704
705bool GBAIsBIOS(struct VFile* vf) {
706 if (vf->seek(vf, 0, SEEK_SET) < 0) {
707 return false;
708 }
709 uint32_t interruptTable[7];
710 if (vf->read(vf, &interruptTable, sizeof(interruptTable)) != sizeof(interruptTable)) {
711 return false;
712 }
713 int i;
714 for (i = 0; i < 7; ++i) {
715 if ((interruptTable[i] & 0xFFFF0000) != 0xEA000000) {
716 return false;
717 }
718 }
719 return true;
720}
721
722void GBAGetGameCode(struct GBA* gba, char* out) {
723 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->id, 4);
724}
725
726void GBAGetGameTitle(struct GBA* gba, char* out) {
727 memcpy(out, &((struct GBACartridge*) gba->memory.rom)->title, 12);
728}
729
730void GBAHitStub(struct ARMCore* cpu, uint32_t opcode) {
731 struct GBA* gba = (struct GBA*) cpu->master;
732 enum GBALogLevel level = GBA_LOG_FATAL;
733 if (gba->debugger) {
734 level = GBA_LOG_STUB;
735 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
736 }
737 GBALog(gba, level, "Stub opcode: %08x", opcode);
738}
739
740void GBAIllegal(struct ARMCore* cpu, uint32_t opcode) {
741 struct GBA* gba = (struct GBA*) cpu->master;
742 GBALog(gba, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
743 if (gba->debugger) {
744 ARMDebuggerEnter(gba->debugger, DEBUGGER_ENTER_ILLEGAL_OP);
745 }
746}
747
748void _checkOverrides(struct GBA* gba, uint32_t id) {
749 int i;
750 gba->busyLoop = -1;
751 if ((id & 0xFF) == 'F') {
752 GBALog(gba, GBA_LOG_DEBUG, "Found Classic NES Series game, using EEPROM saves");
753 GBASavedataInitEEPROM(&gba->memory.savedata);
754 return;
755 }
756 for (i = 0; _overrides[i].id[0]; ++i) {
757 const uint32_t* overrideId = (const uint32_t*) _overrides[i].id;
758 if (*overrideId == id) {
759 GBALog(gba, GBA_LOG_DEBUG, "Found override for game %s!", _overrides[i].id);
760 GBASavedataForceType(&gba->memory.savedata, _overrides[i].type);
761
762 if (_overrides[i].gpio & GPIO_RTC) {
763 GBAGPIOInitRTC(&gba->memory.gpio);
764 }
765
766 if (_overrides[i].gpio & GPIO_GYRO) {
767 GBAGPIOInitGyro(&gba->memory.gpio);
768 }
769
770 if (_overrides[i].gpio & GPIO_RUMBLE) {
771 GBAGPIOInitRumble(&gba->memory.gpio);
772 }
773
774 if (_overrides[i].gpio & GPIO_LIGHT_SENSOR) {
775 GBAGPIOInitLightSensor(&gba->memory.gpio);
776 }
777
778 if (_overrides[i].gpio & GPIO_TILT) {
779 GBAGPIOInitTilt(&gba->memory.gpio);
780 }
781
782 gba->busyLoop = _overrides[i].busyLoop;
783 return;
784 }
785 }
786}