src/gba/io.c (view raw)
1/* Copyright (c) 2013-2015 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 "io.h"
7
8#include "gba/rr/rr.h"
9#include "gba/serialize.h"
10#include "gba/sio.h"
11#include "gba/video.h"
12
13const char* GBAIORegisterNames[] = {
14 // Video
15 "DISPCNT",
16 0,
17 "DISPSTAT",
18 "VCOUNT",
19 "BG0CNT",
20 "BG1CNT",
21 "BG2CNT",
22 "BG3CNT",
23 "BG0HOFS",
24 "BG0VOFS",
25 "BG1HOFS",
26 "BG1VOFS",
27 "BG2HOFS",
28 "BG2VOFS",
29 "BG3HOFS",
30 "BG3VOFS",
31 "BG2PA",
32 "BG2PB",
33 "BG2PC",
34 "BG2PD",
35 "BG2X_LO",
36 "BG2X_HI",
37 "BG2Y_LO",
38 "BG2Y_HI",
39 "BG3PA",
40 "BG3PB",
41 "BG3PC",
42 "BG3PD",
43 "BG3X_LO",
44 "BG3X_HI",
45 "BG3Y_LO",
46 "BG3Y_HI",
47 "WIN0H",
48 "WIN1H",
49 "WIN0V",
50 "WIN1V",
51 "WININ",
52 "WINOUT",
53 "MOSAIC",
54 0,
55 "BLDCNT",
56 "BLDALPHA",
57 "BLDY",
58 0,
59 0,
60 0,
61 0,
62 0,
63
64 // Sound
65 "SOUND1CNT_LO",
66 "SOUND1CNT_HI",
67 "SOUND1CNT_X",
68 0,
69 "SOUND2CNT_LO",
70 0,
71 "SOUND2CNT_HI",
72 0,
73 "SOUND3CNT_LO",
74 "SOUND3CNT_HI",
75 "SOUND3CNT_X",
76 0,
77 "SOUND4CNT_LO",
78 0,
79 "SOUND4CNT_HI",
80 0,
81 "SOUNDCNT_LO",
82 "SOUNDCNT_HI",
83 "SOUNDCNT_X",
84 0,
85 "SOUNDBIAS",
86 0,
87 0,
88 0,
89 "WAVE_RAM0_LO",
90 "WAVE_RAM0_HI",
91 "WAVE_RAM1_LO",
92 "WAVE_RAM1_HI",
93 "WAVE_RAM2_LO",
94 "WAVE_RAM2_HI",
95 "WAVE_RAM3_LO",
96 "WAVE_RAM3_HI",
97 "FIFO_A_LO",
98 "FIFO_A_HI",
99 "FIFO_B_LO",
100 "FIFO_B_HI",
101 0,
102 0,
103 0,
104 0,
105
106 // DMA
107 "DMA0SAD_LO",
108 "DMA0SAD_HI",
109 "DMA0DAD_LO",
110 "DMA0DAD_HI",
111 "DMA0CNT_LO",
112 "DMA0CNT_HI",
113 "DMA1SAD_LO",
114 "DMA1SAD_HI",
115 "DMA1DAD_LO",
116 "DMA1DAD_HI",
117 "DMA1CNT_LO",
118 "DMA1CNT_HI",
119 "DMA2SAD_LO",
120 "DMA2SAD_HI",
121 "DMA2DAD_LO",
122 "DMA2DAD_HI",
123 "DMA2CNT_LO",
124 "DMA2CNT_HI",
125 "DMA3SAD_LO",
126 "DMA3SAD_HI",
127 "DMA3DAD_LO",
128 "DMA3DAD_HI",
129 "DMA3CNT_LO",
130 "DMA3CNT_HI",
131
132 0, 0, 0, 0, 0, 0, 0, 0,
133 0, 0, 0, 0, 0, 0, 0, 0,
134
135 // Timers
136 "TM0CNT_LO",
137 "TM0CNT_HI",
138 "TM1CNT_LO",
139 "TM1CNT_HI",
140 "TM2CNT_LO",
141 "TM2CNT_HI",
142 "TM3CNT_LO",
143 "TM3CNT_HI",
144
145 0, 0, 0, 0, 0, 0, 0, 0,
146
147 // SIO
148 "SIOMULTI0",
149 "SIOMULTI1",
150 "SIOMULTI2",
151 "SIOMULTI3",
152 "SIOCNT",
153 "SIOMLT_SEND",
154 0,
155 0,
156 "KEYINPUT",
157 "KEYCNT",
158 "RCNT",
159 0,
160 0,
161 0,
162 0,
163 0,
164 "JOYCNT",
165 0,
166 0,
167 0,
168 0,
169 0,
170 0,
171 0,
172 "JOY_RECV_LO",
173 "JOY_RECV_HI",
174 "JOY_TRANS_LO",
175 "JOY_TRANS_HI",
176 "JOYSTAT",
177 0,
178 0,
179 0,
180
181 0, 0, 0, 0, 0, 0, 0, 0,
182 0, 0, 0, 0, 0, 0, 0, 0,
183 0, 0, 0, 0, 0, 0, 0, 0,
184 0, 0, 0, 0, 0, 0, 0, 0,
185 0, 0, 0, 0, 0, 0, 0, 0,
186 0, 0, 0, 0, 0, 0, 0, 0,
187 0, 0, 0, 0, 0, 0, 0, 0,
188 0, 0, 0, 0, 0, 0, 0, 0,
189 0, 0, 0, 0, 0, 0, 0, 0,
190 0, 0, 0, 0, 0, 0, 0, 0,
191
192 // Interrupts, etc
193 "IE",
194 "IF",
195 "WAITCNT",
196 0,
197 "IME"
198};
199
200static const int _isValidRegister[REG_MAX >> 1] = {
201 // Video
202 1, 0, 1, 1, 1, 1, 1, 1,
203 1, 1, 1, 1, 1, 1, 1, 1,
204 1, 1, 1, 1, 1, 1, 1, 1,
205 1, 1, 1, 1, 1, 1, 1, 1,
206 1, 1, 1, 1, 1, 1, 1, 0,
207 1, 1, 1, 0, 0, 0, 0, 0,
208 // Audio
209 1, 1, 1, 0, 1, 0, 1, 0,
210 1, 1, 1, 0, 1, 0, 1, 0,
211 1, 1, 1, 0, 1, 0, 0, 0,
212 1, 1, 1, 1, 1, 1, 1, 1,
213 1, 1, 1, 1, 0, 0, 0, 0,
214 // DMA
215 1, 1, 1, 1, 1, 1, 1, 1,
216 1, 1, 1, 1, 1, 1, 1, 1,
217 1, 1, 1, 1, 1, 1, 1, 1,
218 0, 0, 0, 0, 0, 0, 0, 0,
219 0, 0, 0, 0, 0, 0, 0, 0,
220 // Timers
221 1, 1, 1, 1, 1, 1, 1, 1,
222 0, 0, 0, 0, 0, 0, 0, 0,
223 // SIO
224 1, 1, 1, 1, 1, 0, 0, 0,
225 1, 1, 1, 0, 0, 0, 0, 0,
226 1, 0, 0, 0, 0, 0, 0, 0,
227 1, 0, 1, 0, 1, 0, 0, 0,
228 0, 0, 0, 0, 0, 0, 0, 0,
229 0, 0, 0, 0, 0, 0, 0, 0,
230 0, 0, 0, 0, 0, 0, 0, 0,
231 0, 0, 0, 0, 0, 0, 0, 0,
232 0, 0, 0, 0, 0, 0, 0, 0,
233 0, 0, 0, 0, 0, 0, 0, 0,
234 0, 0, 0, 0, 0, 0, 0, 0,
235 0, 0, 0, 0, 0, 0, 0, 0,
236 0, 0, 0, 0, 0, 0, 0, 0,
237 0, 0, 0, 0, 0, 0, 0, 0,
238 // Interrupts
239 1, 1, 1, 0, 1
240};
241
242static const int _isRSpecialRegister[REG_MAX >> 1] = {
243 // Video
244 0, 0, 1, 1, 0, 0, 0, 0,
245 1, 1, 1, 1, 1, 1, 1, 1,
246 1, 1, 1, 1, 1, 1, 1, 1,
247 1, 1, 1, 1, 1, 1, 1, 1,
248 1, 1, 1, 1, 1, 1, 1, 1,
249 1, 1, 1, 1, 1, 1, 1, 1,
250 // Audio
251 0, 0, 0, 0, 0, 0, 0, 0,
252 0, 0, 0, 0, 0, 0, 0, 0,
253 0, 0, 0, 0, 1, 0, 0, 0,
254 1, 1, 1, 1, 1, 1, 1, 1,
255 1, 1, 1, 1, 0, 0, 0, 0,
256 // DMA
257 1, 1, 1, 1, 1, 1, 1, 1,
258 1, 1, 1, 1, 1, 1, 1, 1,
259 1, 1, 1, 1, 1, 1, 1, 1,
260 0, 0, 0, 0, 0, 0, 0, 0,
261 0, 0, 0, 0, 0, 0, 0, 0,
262 // Timers
263 1, 1, 1, 1, 1, 1, 1, 1,
264 0, 0, 0, 0, 0, 0, 0, 0,
265 // SIO
266 1, 1, 1, 1, 1, 0, 0, 0,
267 1, 1, 1, 0, 0, 0, 0, 0,
268 1, 0, 0, 0, 0, 0, 0, 0,
269 1, 0, 1, 0, 1, 0, 0, 0,
270 0, 0, 0, 0, 0, 0, 0, 0,
271 0, 0, 0, 0, 0, 0, 0, 0,
272 0, 0, 0, 0, 0, 0, 0, 0,
273 0, 0, 0, 0, 0, 0, 0, 0,
274 0, 0, 0, 0, 0, 0, 0, 0,
275 0, 0, 0, 0, 0, 0, 0, 0,
276 0, 0, 0, 0, 0, 0, 0, 0,
277 0, 0, 0, 0, 0, 0, 0, 0,
278 0, 0, 0, 0, 0, 0, 0, 0,
279 0, 0, 0, 0, 0, 0, 0, 0,
280 // Interrupts
281};
282
283static const int _isWSpecialRegister[REG_MAX >> 1] = {
284 // Video
285 0, 0, 1, 1, 0, 0, 0, 0,
286 0, 0, 0, 0, 0, 0, 0, 0,
287 0, 0, 0, 0, 0, 0, 0, 0,
288 0, 0, 0, 0, 0, 0, 0, 0,
289 0, 0, 0, 0, 0, 0, 0, 0,
290 0, 0, 0, 0, 0, 0, 0, 0,
291 // Audio
292 0, 0, 0, 0, 0, 0, 0, 0,
293 0, 0, 0, 0, 0, 0, 0, 0,
294 0, 0, 1, 0, 0, 0, 0, 0,
295 1, 1, 1, 1, 1, 1, 1, 1,
296 1, 1, 1, 1, 0, 0, 0, 0,
297 // DMA
298 0, 0, 0, 0, 0, 1, 0, 0,
299 0, 0, 0, 1, 0, 0, 0, 0,
300 0, 1, 0, 0, 0, 0, 0, 1,
301 0, 0, 0, 0, 0, 0, 0, 0,
302 0, 0, 0, 0, 0, 0, 0, 0,
303 // Timers
304 1, 1, 1, 1, 1, 1, 1, 1,
305 0, 0, 0, 0, 0, 0, 0, 0,
306 // SIO
307 1, 1, 1, 1, 1, 0, 0, 0,
308 1, 1, 1, 0, 0, 0, 0, 0,
309 1, 0, 0, 0, 0, 0, 0, 0,
310 1, 0, 1, 0, 1, 0, 0, 0,
311 0, 0, 0, 0, 0, 0, 0, 0,
312 0, 0, 0, 0, 0, 0, 0, 0,
313 0, 0, 0, 0, 0, 0, 0, 0,
314 0, 0, 0, 0, 0, 0, 0, 0,
315 0, 0, 0, 0, 0, 0, 0, 0,
316 0, 0, 0, 0, 0, 0, 0, 0,
317 0, 0, 0, 0, 0, 0, 0, 0,
318 0, 0, 0, 0, 0, 0, 0, 0,
319 0, 0, 0, 0, 0, 0, 0, 0,
320 0, 0, 0, 0, 0, 0, 0, 0,
321 // Interrupts
322 1, 1, 0, 0, 1
323};
324
325void GBAIOInit(struct GBA* gba) {
326 gba->memory.io[REG_DISPCNT >> 1] = 0x0080;
327 gba->memory.io[REG_RCNT >> 1] = RCNT_INITIAL;
328 gba->memory.io[REG_KEYINPUT >> 1] = 0x3FF;
329 gba->memory.io[REG_SOUNDBIAS >> 1] = 0x200;
330 gba->memory.io[REG_BG2PA >> 1] = 0x100;
331 gba->memory.io[REG_BG2PD >> 1] = 0x100;
332 gba->memory.io[REG_BG3PA >> 1] = 0x100;
333 gba->memory.io[REG_BG3PD >> 1] = 0x100;
334}
335
336void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
337 if (address < REG_SOUND1CNT_LO && address != REG_DISPSTAT) {
338 value = gba->video.renderer->writeVideoRegister(gba->video.renderer, address, value);
339 } else {
340 switch (address) {
341 // Video
342 case REG_DISPSTAT:
343 value &= 0xFFF8;
344 GBAVideoWriteDISPSTAT(&gba->video, value);
345 return;
346
347 // Audio
348 case REG_SOUND1CNT_LO:
349 GBAAudioWriteSOUND1CNT_LO(&gba->audio, value);
350 value &= 0x007F;
351 break;
352 case REG_SOUND1CNT_HI:
353 GBAAudioWriteSOUND1CNT_HI(&gba->audio, value);
354 break;
355 case REG_SOUND1CNT_X:
356 GBAAudioWriteSOUND1CNT_X(&gba->audio, value);
357 value &= 0x47FF;
358 break;
359 case REG_SOUND2CNT_LO:
360 GBAAudioWriteSOUND2CNT_LO(&gba->audio, value);
361 break;
362 case REG_SOUND2CNT_HI:
363 GBAAudioWriteSOUND2CNT_HI(&gba->audio, value);
364 value &= 0x47FF;
365 break;
366 case REG_SOUND3CNT_LO:
367 GBAAudioWriteSOUND3CNT_LO(&gba->audio, value);
368 value &= 0x00E0;
369 break;
370 case REG_SOUND3CNT_HI:
371 GBAAudioWriteSOUND3CNT_HI(&gba->audio, value);
372 value &= 0xE03F;
373 break;
374 case REG_SOUND3CNT_X:
375 GBAAudioWriteSOUND3CNT_X(&gba->audio, value);
376 // TODO: The low bits need to not be readable, but still 8-bit writable
377 value &= 0x47FF;
378 break;
379 case REG_SOUND4CNT_LO:
380 GBAAudioWriteSOUND4CNT_LO(&gba->audio, value);
381 value &= 0xFF3F;
382 break;
383 case REG_SOUND4CNT_HI:
384 GBAAudioWriteSOUND4CNT_HI(&gba->audio, value);
385 value &= 0x40FF;
386 break;
387 case REG_SOUNDCNT_LO:
388 GBAAudioWriteSOUNDCNT_LO(&gba->audio, value);
389 value &= 0xFF77;
390 break;
391 case REG_SOUNDCNT_HI:
392 GBAAudioWriteSOUNDCNT_HI(&gba->audio, value);
393 value &= 0x770F;
394 break;
395 case REG_SOUNDCNT_X:
396 GBAAudioWriteSOUNDCNT_X(&gba->audio, value);
397 value &= 0x0080;
398 value |= gba->memory.io[REG_SOUNDCNT_X >> 1] & 0xF;
399 break;
400 case REG_SOUNDBIAS:
401 GBAAudioWriteSOUNDBIAS(&gba->audio, value);
402 break;
403
404 case REG_WAVE_RAM0_LO:
405 case REG_WAVE_RAM1_LO:
406 case REG_WAVE_RAM2_LO:
407 case REG_WAVE_RAM3_LO:
408 GBAIOWrite32(gba, address, (gba->memory.io[(address >> 1) + 1] << 16) | value);
409 break;
410
411 case REG_WAVE_RAM0_HI:
412 case REG_WAVE_RAM1_HI:
413 case REG_WAVE_RAM2_HI:
414 case REG_WAVE_RAM3_HI:
415 GBAIOWrite32(gba, address - 2, gba->memory.io[(address >> 1) - 1] | (value << 16));
416 break;
417
418 case REG_FIFO_A_LO:
419 case REG_FIFO_B_LO:
420 GBAIOWrite32(gba, address, (gba->memory.io[(address >> 1) + 1] << 16) | value);
421 break;
422
423 case REG_FIFO_A_HI:
424 case REG_FIFO_B_HI:
425 GBAIOWrite32(gba, address - 2, gba->memory.io[(address >> 1) - 1] | (value << 16));
426 break;
427
428 // DMA
429 case REG_DMA0SAD_LO:
430 case REG_DMA0DAD_LO:
431 case REG_DMA1SAD_LO:
432 case REG_DMA1DAD_LO:
433 case REG_DMA2SAD_LO:
434 case REG_DMA2DAD_LO:
435 case REG_DMA3SAD_LO:
436 case REG_DMA3DAD_LO:
437 GBAIOWrite32(gba, address, (gba->memory.io[(address >> 1) + 1] << 16) | value);
438 break;
439
440 case REG_DMA0SAD_HI:
441 case REG_DMA0DAD_HI:
442 case REG_DMA1SAD_HI:
443 case REG_DMA1DAD_HI:
444 case REG_DMA2SAD_HI:
445 case REG_DMA2DAD_HI:
446 case REG_DMA3SAD_HI:
447 case REG_DMA3DAD_HI:
448 GBAIOWrite32(gba, address - 2, gba->memory.io[(address >> 1) - 1] | (value << 16));
449 break;
450
451 case REG_DMA0CNT_LO:
452 GBAMemoryWriteDMACNT_LO(gba, 0, value);
453 break;
454 case REG_DMA0CNT_HI:
455 value = GBAMemoryWriteDMACNT_HI(gba, 0, value);
456 break;
457 case REG_DMA1CNT_LO:
458 GBAMemoryWriteDMACNT_LO(gba, 1, value);
459 break;
460 case REG_DMA1CNT_HI:
461 value = GBAMemoryWriteDMACNT_HI(gba, 1, value);
462 break;
463 case REG_DMA2CNT_LO:
464 GBAMemoryWriteDMACNT_LO(gba, 2, value);
465 break;
466 case REG_DMA2CNT_HI:
467 value = GBAMemoryWriteDMACNT_HI(gba, 2, value);
468 break;
469 case REG_DMA3CNT_LO:
470 GBAMemoryWriteDMACNT_LO(gba, 3, value);
471 break;
472 case REG_DMA3CNT_HI:
473 value = GBAMemoryWriteDMACNT_HI(gba, 3, value);
474 break;
475
476 // Timers
477 case REG_TM0CNT_LO:
478 GBATimerWriteTMCNT_LO(gba, 0, value);
479 return;
480 case REG_TM1CNT_LO:
481 GBATimerWriteTMCNT_LO(gba, 1, value);
482 return;
483 case REG_TM2CNT_LO:
484 GBATimerWriteTMCNT_LO(gba, 2, value);
485 return;
486 case REG_TM3CNT_LO:
487 GBATimerWriteTMCNT_LO(gba, 3, value);
488 return;
489
490 case REG_TM0CNT_HI:
491 value &= 0x00C7;
492 GBATimerWriteTMCNT_HI(gba, 0, value);
493 break;
494 case REG_TM1CNT_HI:
495 value &= 0x00C7;
496 GBATimerWriteTMCNT_HI(gba, 1, value);
497 break;
498 case REG_TM2CNT_HI:
499 value &= 0x00C7;
500 GBATimerWriteTMCNT_HI(gba, 2, value);
501 break;
502 case REG_TM3CNT_HI:
503 value &= 0x00C7;
504 GBATimerWriteTMCNT_HI(gba, 3, value);
505 break;
506
507 // SIO
508 case REG_SIOCNT:
509 GBASIOWriteSIOCNT(&gba->sio, value);
510 break;
511 case REG_RCNT:
512 value &= 0xC1FF;
513 GBASIOWriteRCNT(&gba->sio, value);
514 break;
515 case REG_SIOMLT_SEND:
516 GBASIOWriteSIOMLT_SEND(&gba->sio, value);
517 break;
518
519 // Interrupts and misc
520 case REG_WAITCNT:
521 GBAAdjustWaitstates(gba, value);
522 break;
523 case REG_IE:
524 GBAWriteIE(gba, value);
525 break;
526 case REG_IF:
527 value = gba->memory.io[REG_IF >> 1] & ~value;
528 break;
529 case REG_IME:
530 GBAWriteIME(gba, value);
531 break;
532 case REG_MAX:
533 // Some bad interrupt libraries will write to this
534 break;
535 default:
536 GBALog(gba, GBA_LOG_STUB, "Stub I/O register write: %03X", address);
537 if (address >= REG_MAX) {
538 GBALog(gba, GBA_LOG_GAME_ERROR, "Write to unused I/O register: %03X", address);
539 return;
540 }
541 break;
542 }
543 }
544 gba->memory.io[address >> 1] = value;
545}
546
547void GBAIOWrite8(struct GBA* gba, uint32_t address, uint8_t value) {
548 if (address == REG_HALTCNT) {
549 value &= 0x80;
550 if (!value) {
551 GBAHalt(gba);
552 } else {
553 GBAStop(gba);
554 }
555 return;
556 }
557 uint16_t value16 = value << (8 * (address & 1));
558 value16 |= (gba->memory.io[(address & (SIZE_IO - 1)) >> 1]) & ~(0xFF << (8 * (address & 1)));
559 GBAIOWrite(gba, address & 0xFFFFFFFE, value16);
560}
561
562void GBAIOWrite32(struct GBA* gba, uint32_t address, uint32_t value) {
563 switch (address) {
564 case REG_WAVE_RAM0_LO:
565 GBAAudioWriteWaveRAM(&gba->audio, 0, value);
566 break;
567 case REG_WAVE_RAM1_LO:
568 GBAAudioWriteWaveRAM(&gba->audio, 1, value);
569 break;
570 case REG_WAVE_RAM2_LO:
571 GBAAudioWriteWaveRAM(&gba->audio, 2, value);
572 break;
573 case REG_WAVE_RAM3_LO:
574 GBAAudioWriteWaveRAM(&gba->audio, 3, value);
575 break;
576 case REG_FIFO_A_LO:
577 case REG_FIFO_B_LO:
578 GBAAudioWriteFIFO(&gba->audio, address, value);
579 break;
580 case REG_DMA0SAD_LO:
581 value = GBAMemoryWriteDMASAD(gba, 0, value);
582 break;
583 case REG_DMA0DAD_LO:
584 value = GBAMemoryWriteDMADAD(gba, 0, value);
585 break;
586 case REG_DMA1SAD_LO:
587 value = GBAMemoryWriteDMASAD(gba, 1, value);
588 break;
589 case REG_DMA1DAD_LO:
590 value = GBAMemoryWriteDMADAD(gba, 1, value);
591 break;
592 case REG_DMA2SAD_LO:
593 value = GBAMemoryWriteDMASAD(gba, 2, value);
594 break;
595 case REG_DMA2DAD_LO:
596 value = GBAMemoryWriteDMADAD(gba, 2, value);
597 break;
598 case REG_DMA3SAD_LO:
599 value = GBAMemoryWriteDMASAD(gba, 3, value);
600 break;
601 case REG_DMA3DAD_LO:
602 value = GBAMemoryWriteDMADAD(gba, 3, value);
603 break;
604 default:
605 GBAIOWrite(gba, address, value & 0xFFFF);
606 GBAIOWrite(gba, address | 2, value >> 16);
607 return;
608 }
609 gba->memory.io[address >> 1] = value;
610 gba->memory.io[(address >> 1) + 1] = value >> 16;
611}
612
613bool GBAIOIsReadConstant(uint32_t address) {
614 switch (address) {
615 default:
616 return false;
617 case REG_BG0CNT:
618 case REG_BG1CNT:
619 case REG_BG2CNT:
620 case REG_BG3CNT:
621 case REG_WININ:
622 case REG_WINOUT:
623 case REG_BLDCNT:
624 case REG_BLDALPHA:
625 case REG_SOUND1CNT_LO:
626 case REG_SOUND1CNT_HI:
627 case REG_SOUND1CNT_X:
628 case REG_SOUND2CNT_LO:
629 case REG_SOUND2CNT_HI:
630 case REG_SOUND3CNT_LO:
631 case REG_SOUND3CNT_HI:
632 case REG_SOUND3CNT_X:
633 case REG_SOUND4CNT_LO:
634 case REG_SOUND4CNT_HI:
635 case REG_SOUNDCNT_LO:
636 case REG_SOUNDCNT_HI:
637 case REG_TM0CNT_HI:
638 case REG_TM1CNT_HI:
639 case REG_TM2CNT_HI:
640 case REG_TM3CNT_HI:
641 case REG_KEYINPUT:
642 case REG_IE:
643 return true;
644 }
645}
646
647uint16_t GBAIORead(struct GBA* gba, uint32_t address) {
648 if (!GBAIOIsReadConstant(address)) {
649 // Most IO reads need to disable idle removal
650 gba->haltPending = false;
651 }
652
653 switch (address) {
654 case REG_TM0CNT_LO:
655 GBATimerUpdateRegister(gba, 0);
656 break;
657 case REG_TM1CNT_LO:
658 GBATimerUpdateRegister(gba, 1);
659 break;
660 case REG_TM2CNT_LO:
661 GBATimerUpdateRegister(gba, 2);
662 break;
663 case REG_TM3CNT_LO:
664 GBATimerUpdateRegister(gba, 3);
665 break;
666
667 case REG_KEYINPUT:
668 if (gba->rr && gba->rr->isPlaying(gba->rr)) {
669 return 0x3FF ^ gba->rr->queryInput(gba->rr);
670 } else {
671 uint16_t input = 0x3FF;
672 if (gba->keyCallback) {
673 input = gba->keyCallback->readKeys(gba->keyCallback);
674 } else if (gba->keySource) {
675 input = *gba->keySource;
676 }
677 if (gba->rr && gba->rr->isRecording(gba->rr)) {
678 gba->rr->logInput(gba->rr, input);
679 }
680 return 0x3FF ^ input;
681 }
682
683 case REG_SIOCNT:
684 return gba->sio.siocnt;
685 case REG_RCNT:
686 return gba->sio.rcnt;
687
688 case REG_BG0HOFS:
689 case REG_BG0VOFS:
690 case REG_BG1HOFS:
691 case REG_BG1VOFS:
692 case REG_BG2HOFS:
693 case REG_BG2VOFS:
694 case REG_BG3HOFS:
695 case REG_BG3VOFS:
696 case REG_BG2PA:
697 case REG_BG2PB:
698 case REG_BG2PC:
699 case REG_BG2PD:
700 case REG_BG2X_LO:
701 case REG_BG2X_HI:
702 case REG_BG2Y_LO:
703 case REG_BG2Y_HI:
704 case REG_BG3PA:
705 case REG_BG3PB:
706 case REG_BG3PC:
707 case REG_BG3PD:
708 case REG_BG3X_LO:
709 case REG_BG3X_HI:
710 case REG_BG3Y_LO:
711 case REG_BG3Y_HI:
712 case REG_WIN0H:
713 case REG_WIN1H:
714 case REG_WIN0V:
715 case REG_WIN1V:
716 case REG_MOSAIC:
717 case REG_BLDY:
718 case REG_FIFO_A_LO:
719 case REG_FIFO_A_HI:
720 case REG_FIFO_B_LO:
721 case REG_FIFO_B_HI:
722 case REG_DMA0SAD_LO:
723 case REG_DMA0SAD_HI:
724 case REG_DMA0DAD_LO:
725 case REG_DMA0DAD_HI:
726 case REG_DMA0CNT_LO:
727 case REG_DMA1SAD_LO:
728 case REG_DMA1SAD_HI:
729 case REG_DMA1DAD_LO:
730 case REG_DMA1DAD_HI:
731 case REG_DMA1CNT_LO:
732 case REG_DMA2SAD_LO:
733 case REG_DMA2SAD_HI:
734 case REG_DMA2DAD_LO:
735 case REG_DMA2DAD_HI:
736 case REG_DMA2CNT_LO:
737 case REG_DMA3SAD_LO:
738 case REG_DMA3SAD_HI:
739 case REG_DMA3DAD_LO:
740 case REG_DMA3DAD_HI:
741 case REG_DMA3CNT_LO:
742 // Write-only register
743 GBALog(gba, GBA_LOG_GAME_ERROR, "Read from write-only I/O register: %03X", address);
744 return GBALoadBad(gba->cpu);
745
746 case REG_SOUNDBIAS:
747 case REG_JOYCNT:
748 case REG_JOY_RECV:
749 case REG_JOY_TRANS:
750 case REG_KEYCNT:
751 case REG_POSTFLG:
752 GBALog(gba, GBA_LOG_STUB, "Stub I/O register read: %03x", address);
753 break;
754 case REG_SOUND1CNT_LO:
755 case REG_SOUND1CNT_HI:
756 case REG_SOUND1CNT_X:
757 case REG_SOUND2CNT_LO:
758 case REG_SOUND2CNT_HI:
759 case REG_SOUND3CNT_LO:
760 case REG_SOUND3CNT_HI:
761 case REG_SOUND3CNT_X:
762 case REG_SOUND4CNT_LO:
763 case REG_SOUND4CNT_HI:
764 case REG_SOUNDCNT_LO:
765 case REG_SOUNDCNT_HI:
766 if (!GBARegisterSOUNDCNT_XIsEnable(gba->memory.io[REG_SOUNDCNT_X >> 1])) {
767 // TODO: Is writing allowed when the circuit is disabled?
768 return 0;
769 }
770 // Fall through
771 case REG_DISPCNT:
772 case REG_DISPSTAT:
773 case REG_VCOUNT:
774 case REG_BG0CNT:
775 case REG_BG1CNT:
776 case REG_BG2CNT:
777 case REG_BG3CNT:
778 case REG_WININ:
779 case REG_WINOUT:
780 case REG_BLDCNT:
781 case REG_BLDALPHA:
782 case REG_SOUNDCNT_X:
783 case REG_WAVE_RAM0_LO:
784 case REG_WAVE_RAM0_HI:
785 case REG_WAVE_RAM1_LO:
786 case REG_WAVE_RAM1_HI:
787 case REG_WAVE_RAM2_LO:
788 case REG_WAVE_RAM2_HI:
789 case REG_WAVE_RAM3_LO:
790 case REG_WAVE_RAM3_HI:
791 case REG_DMA0CNT_HI:
792 case REG_DMA1CNT_HI:
793 case REG_DMA2CNT_HI:
794 case REG_DMA3CNT_HI:
795 case REG_SIOMULTI0:
796 case REG_SIOMULTI1:
797 case REG_SIOMULTI2:
798 case REG_SIOMULTI3:
799 case REG_SIOMLT_SEND:
800 case REG_IE:
801 case REG_IF:
802 case REG_WAITCNT:
803 case REG_IME:
804 // Handled transparently by registers
805 break;
806 case REG_MAX:
807 // Some bad interrupt libraries will read from this
808 break;
809 default:
810 GBALog(gba, GBA_LOG_GAME_ERROR, "Read from unused I/O register: %03X", address);
811 return GBALoadBad(gba->cpu);
812 }
813 return gba->memory.io[address >> 1];
814}
815
816void GBAIOSerialize(struct GBA* gba, struct GBASerializedState* state) {
817 int i;
818 for (i = 0; i < REG_MAX; i += 2) {
819 if (_isRSpecialRegister[i >> 1]) {
820 STORE_16(gba->memory.io[i >> 1], i, state->io);
821 } else if (_isValidRegister[i >> 1]) {
822 uint16_t reg = GBAIORead(gba, i);
823 STORE_16(reg, i, state->io);
824 }
825 }
826
827 for (i = 0; i < 4; ++i) {
828 STORE_16(gba->memory.io[(REG_DMA0CNT_LO + i * 12) >> 1], (REG_DMA0CNT_LO + i * 12), state->io);
829 STORE_16(gba->timers[i].reload, 0, &state->timers[i].reload);
830 STORE_16(gba->timers[i].oldReload, 0, &state->timers[i].oldReload);
831 STORE_32(gba->timers[i].lastEvent, 0, &state->timers[i].lastEvent);
832 STORE_32(gba->timers[i].nextEvent, 0, &state->timers[i].nextEvent);
833 STORE_32(gba->timers[i].overflowInterval, 0, &state->timers[i].overflowInterval);
834 STORE_32(gba->timers[i].flags, 0, &state->timers[i].flags);
835 STORE_32(gba->memory.dma[i].nextSource, 0, &state->dma[i].nextSource);
836 STORE_32(gba->memory.dma[i].nextDest, 0, &state->dma[i].nextDest);
837 STORE_32(gba->memory.dma[i].nextCount, 0, &state->dma[i].nextCount);
838 STORE_32(gba->memory.dma[i].nextEvent, 0, &state->dma[i].nextEvent);
839 }
840
841 GBAHardwareSerialize(&gba->memory.hw, state);
842}
843
844void GBAIODeserialize(struct GBA* gba, const struct GBASerializedState* state) {
845 int i;
846 for (i = 0; i < REG_MAX; i += 2) {
847 if (_isWSpecialRegister[i >> 1]) {
848 LOAD_16(gba->memory.io[i >> 1], i, state->io);
849 } else if (_isValidRegister[i >> 1]) {
850 uint16_t reg;
851 LOAD_16(reg, i, state->io);
852 GBAIOWrite(gba, i, reg);
853 }
854 }
855
856 gba->timersEnabled = 0;
857 for (i = 0; i < 4; ++i) {
858 LOAD_16(gba->timers[i].reload, 0, &state->timers[i].reload);
859 LOAD_16(gba->timers[i].oldReload, 0, &state->timers[i].oldReload);
860 LOAD_32(gba->timers[i].lastEvent, 0, &state->timers[i].lastEvent);
861 LOAD_32(gba->timers[i].nextEvent, 0, &state->timers[i].nextEvent);
862 LOAD_32(gba->timers[i].overflowInterval, 0, &state->timers[i].overflowInterval);
863 LOAD_32(gba->timers[i].flags, 0, &state->timers[i].flags);
864 LOAD_16(gba->memory.dma[i].reg, (REG_DMA0CNT_HI + i * 12), state->io);
865 LOAD_32(gba->memory.dma[i].nextSource, 0, &state->dma[i].nextSource);
866 LOAD_32(gba->memory.dma[i].nextDest, 0, &state->dma[i].nextDest);
867 LOAD_32(gba->memory.dma[i].nextCount, 0, &state->dma[i].nextCount);
868 LOAD_32(gba->memory.dma[i].nextEvent, 0, &state->dma[i].nextEvent);
869 if (GBADMARegisterGetTiming(gba->memory.dma[i].reg) != DMA_TIMING_NOW) {
870 GBAMemoryScheduleDMA(gba, i, &gba->memory.dma[i]);
871 }
872
873 if (GBATimerFlagsIsEnable(gba->timers[i].flags)) {
874 gba->timersEnabled |= 1 << i;
875 }
876 }
877 GBAAudioWriteSOUNDCNT_X(&gba->audio, gba->memory.io[REG_SOUNDCNT_X >> 1]);
878 GBAMemoryUpdateDMAs(gba, 0);
879 GBAHardwareDeserialize(&gba->memory.hw, state);
880}