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