all repos — mgba @ f8759a8760f4af6bd12188beeae82fb4e2ea5585

mGBA Game Boy Advance Emulator

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 <mgba/internal/gba/io.h>
  7
  8#include <mgba/internal/arm/macros.h>
  9#include <mgba/internal/gba/dma.h>
 10#include <mgba/internal/gba/gba.h>
 11#include <mgba/internal/gba/rr/rr.h>
 12#include <mgba/internal/gba/serialize.h>
 13
 14mLOG_DEFINE_CATEGORY(GBA_IO, "GBA I/O", "gba.io");
 15
 16const char* const GBAIORegisterNames[] = {
 17	// Video
 18	"DISPCNT",
 19	0,
 20	"DISPSTAT",
 21	"VCOUNT",
 22	"BG0CNT",
 23	"BG1CNT",
 24	"BG2CNT",
 25	"BG3CNT",
 26	"BG0HOFS",
 27	"BG0VOFS",
 28	"BG1HOFS",
 29	"BG1VOFS",
 30	"BG2HOFS",
 31	"BG2VOFS",
 32	"BG3HOFS",
 33	"BG3VOFS",
 34	"BG2PA",
 35	"BG2PB",
 36	"BG2PC",
 37	"BG2PD",
 38	"BG2X_LO",
 39	"BG2X_HI",
 40	"BG2Y_LO",
 41	"BG2Y_HI",
 42	"BG3PA",
 43	"BG3PB",
 44	"BG3PC",
 45	"BG3PD",
 46	"BG3X_LO",
 47	"BG3X_HI",
 48	"BG3Y_LO",
 49	"BG3Y_HI",
 50	"WIN0H",
 51	"WIN1H",
 52	"WIN0V",
 53	"WIN1V",
 54	"WININ",
 55	"WINOUT",
 56	"MOSAIC",
 57	0,
 58	"BLDCNT",
 59	"BLDALPHA",
 60	"BLDY",
 61	0,
 62	0,
 63	0,
 64	0,
 65	0,
 66
 67	// Sound
 68	"SOUND1CNT_LO",
 69	"SOUND1CNT_HI",
 70	"SOUND1CNT_X",
 71	0,
 72	"SOUND2CNT_LO",
 73	0,
 74	"SOUND2CNT_HI",
 75	0,
 76	"SOUND3CNT_LO",
 77	"SOUND3CNT_HI",
 78	"SOUND3CNT_X",
 79	0,
 80	"SOUND4CNT_LO",
 81	0,
 82	"SOUND4CNT_HI",
 83	0,
 84	"SOUNDCNT_LO",
 85	"SOUNDCNT_HI",
 86	"SOUNDCNT_X",
 87	0,
 88	"SOUNDBIAS",
 89	0,
 90	0,
 91	0,
 92	"WAVE_RAM0_LO",
 93	"WAVE_RAM0_HI",
 94	"WAVE_RAM1_LO",
 95	"WAVE_RAM1_HI",
 96	"WAVE_RAM2_LO",
 97	"WAVE_RAM2_HI",
 98	"WAVE_RAM3_LO",
 99	"WAVE_RAM3_HI",
100	"FIFO_A_LO",
101	"FIFO_A_HI",
102	"FIFO_B_LO",
103	"FIFO_B_HI",
104	0,
105	0,
106	0,
107	0,
108
109	// DMA
110	"DMA0SAD_LO",
111	"DMA0SAD_HI",
112	"DMA0DAD_LO",
113	"DMA0DAD_HI",
114	"DMA0CNT_LO",
115	"DMA0CNT_HI",
116	"DMA1SAD_LO",
117	"DMA1SAD_HI",
118	"DMA1DAD_LO",
119	"DMA1DAD_HI",
120	"DMA1CNT_LO",
121	"DMA1CNT_HI",
122	"DMA2SAD_LO",
123	"DMA2SAD_HI",
124	"DMA2DAD_LO",
125	"DMA2DAD_HI",
126	"DMA2CNT_LO",
127	"DMA2CNT_HI",
128	"DMA3SAD_LO",
129	"DMA3SAD_HI",
130	"DMA3DAD_LO",
131	"DMA3DAD_HI",
132	"DMA3CNT_LO",
133	"DMA3CNT_HI",
134
135	0, 0, 0, 0, 0, 0, 0, 0,
136	0, 0, 0, 0, 0, 0, 0, 0,
137
138	// Timers
139	"TM0CNT_LO",
140	"TM0CNT_HI",
141	"TM1CNT_LO",
142	"TM1CNT_HI",
143	"TM2CNT_LO",
144	"TM2CNT_HI",
145	"TM3CNT_LO",
146	"TM3CNT_HI",
147
148	0, 0, 0, 0, 0, 0, 0, 0,
149
150	// SIO
151	"SIOMULTI0",
152	"SIOMULTI1",
153	"SIOMULTI2",
154	"SIOMULTI3",
155	"SIOCNT",
156	"SIOMLT_SEND",
157	0,
158	0,
159	"KEYINPUT",
160	"KEYCNT",
161	"RCNT",
162	0,
163	0,
164	0,
165	0,
166	0,
167	"JOYCNT",
168	0,
169	0,
170	0,
171	0,
172	0,
173	0,
174	0,
175	"JOY_RECV_LO",
176	"JOY_RECV_HI",
177	"JOY_TRANS_LO",
178	"JOY_TRANS_HI",
179	"JOYSTAT",
180	0,
181	0,
182	0,
183
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	0, 0, 0, 0, 0, 0, 0, 0,
192	0, 0, 0, 0, 0, 0, 0, 0,
193	0, 0, 0, 0, 0, 0, 0, 0,
194
195	// Interrupts, etc
196	"IE",
197	"IF",
198	"WAITCNT",
199	0,
200	"IME"
201};
202
203static const int _isValidRegister[REG_MAX >> 1] = {
204	// Video
205	1, 0, 1, 1, 1, 1, 1, 1,
206	1, 1, 1, 1, 1, 1, 1, 1,
207	1, 1, 1, 1, 1, 1, 1, 1,
208	1, 1, 1, 1, 1, 1, 1, 1,
209	1, 1, 1, 1, 1, 1, 1, 0,
210	1, 1, 1, 0, 0, 0, 0, 0,
211	// Audio
212	1, 1, 1, 0, 1, 0, 1, 0,
213	1, 1, 1, 0, 1, 0, 1, 0,
214	1, 1, 1, 0, 1, 0, 0, 0,
215	1, 1, 1, 1, 1, 1, 1, 1,
216	1, 1, 1, 1, 0, 0, 0, 0,
217	// DMA
218	1, 1, 1, 1, 1, 1, 1, 1,
219	1, 1, 1, 1, 1, 1, 1, 1,
220	1, 1, 1, 1, 1, 1, 1, 1,
221	0, 0, 0, 0, 0, 0, 0, 0,
222	0, 0, 0, 0, 0, 0, 0, 0,
223	// Timers
224	1, 1, 1, 1, 1, 1, 1, 1,
225	0, 0, 0, 0, 0, 0, 0, 0,
226	// SIO
227	1, 1, 1, 1, 1, 0, 0, 0,
228	1, 1, 1, 0, 0, 0, 0, 0,
229	1, 0, 0, 0, 0, 0, 0, 0,
230	1, 0, 1, 0, 1, 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	0, 0, 0, 0, 0, 0, 0, 0,
239	0, 0, 0, 0, 0, 0, 0, 0,
240	0, 0, 0, 0, 0, 0, 0, 0,
241	// Interrupts
242	1, 1, 1, 0, 1
243};
244
245static const int _isRSpecialRegister[REG_MAX >> 1] = {
246	// Video
247	0, 0, 1, 1, 0, 0, 0, 0,
248	1, 1, 1, 1, 1, 1, 1, 1,
249	1, 1, 1, 1, 1, 1, 1, 1,
250	1, 1, 1, 1, 1, 1, 1, 1,
251	1, 1, 1, 1, 1, 1, 1, 1,
252	1, 1, 1, 1, 1, 1, 1, 1,
253	// Audio
254	0, 0, 1, 0, 0, 0, 1, 0,
255	0, 0, 1, 0, 0, 0, 1, 0,
256	0, 0, 0, 0, 1, 0, 0, 0,
257	1, 1, 1, 1, 1, 1, 1, 1,
258	1, 1, 1, 1, 0, 0, 0, 0,
259	// DMA
260	1, 1, 1, 1, 1, 1, 1, 1,
261	1, 1, 1, 1, 1, 1, 1, 1,
262	1, 1, 1, 1, 1, 1, 1, 1,
263	0, 0, 0, 0, 0, 0, 0, 0,
264	0, 0, 0, 0, 0, 0, 0, 0,
265	// Timers
266	1, 1, 1, 1, 1, 1, 1, 1,
267	0, 0, 0, 0, 0, 0, 0, 0,
268	// SIO
269	1, 1, 1, 1, 1, 0, 0, 0,
270	1, 1, 1, 0, 0, 0, 0, 0,
271	1, 0, 0, 0, 0, 0, 0, 0,
272	1, 0, 1, 0, 1, 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	0, 0, 0, 0, 0, 0, 0, 0,
281	0, 0, 0, 0, 0, 0, 0, 0,
282	0, 0, 0, 0, 0, 0, 0, 0,
283	// Interrupts
284};
285
286static const int _isWSpecialRegister[REG_MAX >> 1] = {
287	// Video
288	0, 0, 1, 1, 0, 0, 0, 0,
289	0, 0, 0, 0, 0, 0, 0, 0,
290	0, 0, 0, 0, 0, 0, 0, 0,
291	0, 0, 0, 0, 0, 0, 0, 0,
292	0, 0, 0, 0, 0, 0, 0, 0,
293	0, 0, 0, 0, 0, 0, 0, 0,
294	// Audio
295	1, 1, 1, 0, 1, 0, 1, 0,
296	1, 1, 1, 0, 1, 0, 1, 0,
297	1, 0, 1, 0, 0, 0, 0, 0,
298	1, 1, 1, 1, 1, 1, 1, 1,
299	1, 1, 1, 1, 0, 0, 0, 0,
300	// DMA
301	0, 0, 0, 0, 0, 1, 0, 0,
302	0, 0, 0, 1, 0, 0, 0, 0,
303	0, 1, 0, 0, 0, 0, 0, 1,
304	0, 0, 0, 0, 0, 0, 0, 0,
305	0, 0, 0, 0, 0, 0, 0, 0,
306	// Timers
307	1, 1, 1, 1, 1, 1, 1, 1,
308	0, 0, 0, 0, 0, 0, 0, 0,
309	// SIO
310	1, 1, 1, 1, 1, 0, 0, 0,
311	1, 1, 1, 0, 0, 0, 0, 0,
312	1, 0, 0, 0, 0, 0, 0, 0,
313	1, 0, 1, 0, 1, 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	0, 0, 0, 0, 0, 0, 0, 0,
322	0, 0, 0, 0, 0, 0, 0, 0,
323	0, 0, 0, 0, 0, 0, 0, 0,
324	// Interrupts
325	1, 1, 0, 0, 1
326};
327
328void GBAIOInit(struct GBA* gba) {
329	gba->memory.io[REG_DISPCNT >> 1] = 0x0080;
330	gba->memory.io[REG_RCNT >> 1] = RCNT_INITIAL;
331	gba->memory.io[REG_KEYINPUT >> 1] = 0x3FF;
332	gba->memory.io[REG_SOUNDBIAS >> 1] = 0x200;
333	gba->memory.io[REG_BG2PA >> 1] = 0x100;
334	gba->memory.io[REG_BG2PD >> 1] = 0x100;
335	gba->memory.io[REG_BG3PA >> 1] = 0x100;
336	gba->memory.io[REG_BG3PD >> 1] = 0x100;
337
338	if (!gba->biosVf) {
339		gba->memory.io[REG_VCOUNT >> 1] = 0x7E;
340		gba->memory.io[REG_POSTFLG >> 1] = 1;
341	}
342}
343
344void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
345	if (address < REG_SOUND1CNT_LO && (address > REG_VCOUNT || address == REG_DISPCNT)) {
346		value = gba->video.renderer->writeVideoRegister(gba->video.renderer, address, value);
347	} else {
348		switch (address) {
349		// Video
350		case REG_DISPSTAT:
351			value &= 0xFFF8;
352			GBAVideoWriteDISPSTAT(&gba->video, value);
353			return;
354
355		case REG_VCOUNT:
356			mLOG(GBA_IO, GAME_ERROR, "Write to read-only I/O register: %03X", address);
357			return;
358
359		// Audio
360		case REG_SOUND1CNT_LO:
361			GBAAudioWriteSOUND1CNT_LO(&gba->audio, value);
362			value &= 0x007F;
363			break;
364		case REG_SOUND1CNT_HI:
365			GBAAudioWriteSOUND1CNT_HI(&gba->audio, value);
366			break;
367		case REG_SOUND1CNT_X:
368			GBAAudioWriteSOUND1CNT_X(&gba->audio, value);
369			value &= 0x47FF;
370			break;
371		case REG_SOUND2CNT_LO:
372			GBAAudioWriteSOUND2CNT_LO(&gba->audio, value);
373			break;
374		case REG_SOUND2CNT_HI:
375			GBAAudioWriteSOUND2CNT_HI(&gba->audio, value);
376			value &= 0x47FF;
377			break;
378		case REG_SOUND3CNT_LO:
379			GBAAudioWriteSOUND3CNT_LO(&gba->audio, value);
380			value &= 0x00E0;
381			break;
382		case REG_SOUND3CNT_HI:
383			GBAAudioWriteSOUND3CNT_HI(&gba->audio, value);
384			value &= 0xE03F;
385			break;
386		case REG_SOUND3CNT_X:
387			GBAAudioWriteSOUND3CNT_X(&gba->audio, value);
388			// TODO: The low bits need to not be readable, but still 8-bit writable
389			value &= 0x47FF;
390			break;
391		case REG_SOUND4CNT_LO:
392			GBAAudioWriteSOUND4CNT_LO(&gba->audio, value);
393			value &= 0xFF3F;
394			break;
395		case REG_SOUND4CNT_HI:
396			GBAAudioWriteSOUND4CNT_HI(&gba->audio, value);
397			value &= 0x40FF;
398			break;
399		case REG_SOUNDCNT_LO:
400			GBAAudioWriteSOUNDCNT_LO(&gba->audio, value);
401			value &= 0xFF77;
402			break;
403		case REG_SOUNDCNT_HI:
404			GBAAudioWriteSOUNDCNT_HI(&gba->audio, value);
405			value &= 0x770F;
406			break;
407		case REG_SOUNDCNT_X:
408			GBAAudioWriteSOUNDCNT_X(&gba->audio, value);
409			value &= 0x0080;
410			value |= gba->memory.io[REG_SOUNDCNT_X >> 1] & 0xF;
411			break;
412		case REG_SOUNDBIAS:
413			GBAAudioWriteSOUNDBIAS(&gba->audio, value);
414			break;
415
416		case REG_WAVE_RAM0_LO:
417		case REG_WAVE_RAM1_LO:
418		case REG_WAVE_RAM2_LO:
419		case REG_WAVE_RAM3_LO:
420			GBAIOWrite32(gba, address, (gba->memory.io[(address >> 1) + 1] << 16) | value);
421			break;
422
423		case REG_WAVE_RAM0_HI:
424		case REG_WAVE_RAM1_HI:
425		case REG_WAVE_RAM2_HI:
426		case REG_WAVE_RAM3_HI:
427			GBAIOWrite32(gba, address - 2, gba->memory.io[(address >> 1) - 1] | (value << 16));
428			break;
429
430		case REG_FIFO_A_LO:
431		case REG_FIFO_B_LO:
432			GBAIOWrite32(gba, address, (gba->memory.io[(address >> 1) + 1] << 16) | value);
433			break;
434
435		case REG_FIFO_A_HI:
436		case REG_FIFO_B_HI:
437			GBAIOWrite32(gba, address - 2, gba->memory.io[(address >> 1) - 1] | (value << 16));
438			break;
439
440		// DMA
441		case REG_DMA0SAD_LO:
442		case REG_DMA0DAD_LO:
443		case REG_DMA1SAD_LO:
444		case REG_DMA1DAD_LO:
445		case REG_DMA2SAD_LO:
446		case REG_DMA2DAD_LO:
447		case REG_DMA3SAD_LO:
448		case REG_DMA3DAD_LO:
449			GBAIOWrite32(gba, address, (gba->memory.io[(address >> 1) + 1] << 16) | value);
450			break;
451
452		case REG_DMA0SAD_HI:
453		case REG_DMA0DAD_HI:
454		case REG_DMA1SAD_HI:
455		case REG_DMA1DAD_HI:
456		case REG_DMA2SAD_HI:
457		case REG_DMA2DAD_HI:
458		case REG_DMA3SAD_HI:
459		case REG_DMA3DAD_HI:
460			GBAIOWrite32(gba, address - 2, gba->memory.io[(address >> 1) - 1] | (value << 16));
461			break;
462
463		case REG_DMA0CNT_LO:
464			GBADMAWriteCNT_LO(gba, 0, value);
465			break;
466		case REG_DMA0CNT_HI:
467			value = GBADMAWriteCNT_HI(gba, 0, value);
468			break;
469		case REG_DMA1CNT_LO:
470			GBADMAWriteCNT_LO(gba, 1, value);
471			break;
472		case REG_DMA1CNT_HI:
473			value = GBADMAWriteCNT_HI(gba, 1, value);
474			break;
475		case REG_DMA2CNT_LO:
476			GBADMAWriteCNT_LO(gba, 2, value);
477			break;
478		case REG_DMA2CNT_HI:
479			value = GBADMAWriteCNT_HI(gba, 2, value);
480			break;
481		case REG_DMA3CNT_LO:
482			GBADMAWriteCNT_LO(gba, 3, value);
483			break;
484		case REG_DMA3CNT_HI:
485			value = GBADMAWriteCNT_HI(gba, 3, value);
486			break;
487
488		// Timers
489		case REG_TM0CNT_LO:
490			GBATimerWriteTMCNT_LO(gba, 0, value);
491			return;
492		case REG_TM1CNT_LO:
493			GBATimerWriteTMCNT_LO(gba, 1, value);
494			return;
495		case REG_TM2CNT_LO:
496			GBATimerWriteTMCNT_LO(gba, 2, value);
497			return;
498		case REG_TM3CNT_LO:
499			GBATimerWriteTMCNT_LO(gba, 3, value);
500			return;
501
502		case REG_TM0CNT_HI:
503			value &= 0x00C7;
504			GBATimerWriteTMCNT_HI(gba, 0, value);
505			break;
506		case REG_TM1CNT_HI:
507			value &= 0x00C7;
508			GBATimerWriteTMCNT_HI(gba, 1, value);
509			break;
510		case REG_TM2CNT_HI:
511			value &= 0x00C7;
512			GBATimerWriteTMCNT_HI(gba, 2, value);
513			break;
514		case REG_TM3CNT_HI:
515			value &= 0x00C7;
516			GBATimerWriteTMCNT_HI(gba, 3, value);
517			break;
518
519		// SIO
520		case REG_SIOCNT:
521			GBASIOWriteSIOCNT(&gba->sio, value);
522			break;
523		case REG_RCNT:
524			value &= 0xC1FF;
525			GBASIOWriteRCNT(&gba->sio, value);
526			break;
527		case REG_JOY_TRANS_LO:
528		case REG_JOY_TRANS_HI:
529			gba->memory.io[REG_JOYSTAT >> 1] |= JOYSTAT_TRANS_BIT;
530			// Fall through
531		case REG_SIOMLT_SEND:
532		case REG_JOYCNT:
533		case REG_JOYSTAT:
534		case REG_JOY_RECV_LO:
535		case REG_JOY_RECV_HI:
536			value = GBASIOWriteRegister(&gba->sio, address, value);
537			break;
538
539		// Interrupts and misc
540		case REG_KEYCNT:
541			value &= 0xC3FF;
542			gba->memory.io[address >> 1] = value;
543			GBATestKeypadIRQ(gba);
544			return;
545		case REG_WAITCNT:
546			value &= 0x5FFF;
547			GBAAdjustWaitstates(gba, value);
548			break;
549		case REG_IE:
550			GBAWriteIE(gba, value);
551			break;
552		case REG_IF:
553			gba->springIRQ &= ~value;
554			value = gba->memory.io[REG_IF >> 1] & ~value;
555			break;
556		case REG_IME:
557			GBAWriteIME(gba, value);
558			break;
559		case REG_MAX:
560			// Some bad interrupt libraries will write to this
561			break;
562		case REG_DEBUG_ENABLE:
563			gba->debug = value == 0xC0DE;
564			return;
565		case REG_DEBUG_FLAGS:
566			if (gba->debug) {
567				GBADebug(gba, value);
568				return;
569			}
570			// Fall through
571		default:
572			if (address >= REG_DEBUG_STRING && address - REG_DEBUG_STRING < sizeof(gba->debugString)) {
573				STORE_16LE(value, address - REG_DEBUG_STRING, gba->debugString);
574				return;
575			}
576			mLOG(GBA_IO, STUB, "Stub I/O register write: %03X", address);
577			if (address >= REG_MAX) {
578				mLOG(GBA_IO, GAME_ERROR, "Write to unused I/O register: %03X", address);
579				return;
580			}
581			break;
582		}
583	}
584	gba->memory.io[address >> 1] = value;
585}
586
587void GBAIOWrite8(struct GBA* gba, uint32_t address, uint8_t value) {
588	if (address == REG_HALTCNT) {
589		value &= 0x80;
590		if (!value) {
591			GBAHalt(gba);
592		} else {
593			GBAStop(gba);
594		}
595		return;
596	}
597	if (address == REG_POSTFLG) {
598		gba->memory.io[(address & (SIZE_IO - 1)) >> 1] = value;
599		return;
600	}
601	if (address >= REG_DEBUG_STRING && address - REG_DEBUG_STRING < sizeof(gba->debugString)) {
602		gba->debugString[address - REG_DEBUG_STRING] = value;
603		return;
604	}
605	if (address > SIZE_IO) {
606		return;
607	}
608	uint16_t value16 = value << (8 * (address & 1));
609	value16 |= (gba->memory.io[(address & (SIZE_IO - 1)) >> 1]) & ~(0xFF << (8 * (address & 1)));
610	GBAIOWrite(gba, address & 0xFFFFFFFE, value16);
611}
612
613void GBAIOWrite32(struct GBA* gba, uint32_t address, uint32_t value) {
614	switch (address) {
615	case REG_WAVE_RAM0_LO:
616		GBAAudioWriteWaveRAM(&gba->audio, 0, value);
617		break;
618	case REG_WAVE_RAM1_LO:
619		GBAAudioWriteWaveRAM(&gba->audio, 1, value);
620		break;
621	case REG_WAVE_RAM2_LO:
622		GBAAudioWriteWaveRAM(&gba->audio, 2, value);
623		break;
624	case REG_WAVE_RAM3_LO:
625		GBAAudioWriteWaveRAM(&gba->audio, 3, value);
626		break;
627	case REG_FIFO_A_LO:
628	case REG_FIFO_B_LO:
629		GBAAudioWriteFIFO(&gba->audio, address, value);
630		break;
631	case REG_DMA0SAD_LO:
632		value = GBADMAWriteSAD(gba, 0, value);
633		break;
634	case REG_DMA0DAD_LO:
635		value = GBADMAWriteDAD(gba, 0, value);
636		break;
637	case REG_DMA1SAD_LO:
638		value = GBADMAWriteSAD(gba, 1, value);
639		break;
640	case REG_DMA1DAD_LO:
641		value = GBADMAWriteDAD(gba, 1, value);
642		break;
643	case REG_DMA2SAD_LO:
644		value = GBADMAWriteSAD(gba, 2, value);
645		break;
646	case REG_DMA2DAD_LO:
647		value = GBADMAWriteDAD(gba, 2, value);
648		break;
649	case REG_DMA3SAD_LO:
650		value = GBADMAWriteSAD(gba, 3, value);
651		break;
652	case REG_DMA3DAD_LO:
653		value = GBADMAWriteDAD(gba, 3, value);
654		break;
655	default:
656		if (address >= REG_DEBUG_STRING && address - REG_DEBUG_STRING < sizeof(gba->debugString)) {
657			STORE_32LE(value, address - REG_DEBUG_STRING, gba->debugString);
658			return;
659		}
660		GBAIOWrite(gba, address, value & 0xFFFF);
661		GBAIOWrite(gba, address | 2, value >> 16);
662		return;
663	}
664	gba->memory.io[address >> 1] = value;
665	gba->memory.io[(address >> 1) + 1] = value >> 16;
666}
667
668bool GBAIOIsReadConstant(uint32_t address) {
669	switch (address) {
670	default:
671		return false;
672	case REG_BG0CNT:
673	case REG_BG1CNT:
674	case REG_BG2CNT:
675	case REG_BG3CNT:
676	case REG_WININ:
677	case REG_WINOUT:
678	case REG_BLDCNT:
679	case REG_BLDALPHA:
680	case REG_SOUND1CNT_LO:
681	case REG_SOUND1CNT_HI:
682	case REG_SOUND1CNT_X:
683	case REG_SOUND2CNT_LO:
684	case REG_SOUND2CNT_HI:
685	case REG_SOUND3CNT_LO:
686	case REG_SOUND3CNT_HI:
687	case REG_SOUND3CNT_X:
688	case REG_SOUND4CNT_LO:
689	case REG_SOUND4CNT_HI:
690	case REG_SOUNDCNT_LO:
691	case REG_SOUNDCNT_HI:
692	case REG_TM0CNT_HI:
693	case REG_TM1CNT_HI:
694	case REG_TM2CNT_HI:
695	case REG_TM3CNT_HI:
696	case REG_KEYINPUT:
697	case REG_KEYCNT:
698	case REG_IE:
699		return true;
700	}
701}
702
703uint16_t GBAIORead(struct GBA* gba, uint32_t address) {
704	if (!GBAIOIsReadConstant(address)) {
705		// Most IO reads need to disable idle removal
706		gba->haltPending = false;
707	}
708
709	switch (address) {
710	// Reading this takes two cycles (1N+1I), so let's remove them preemptively
711	case REG_TM0CNT_LO:
712		GBATimerUpdateRegister(gba, 0, 4);
713		break;
714	case REG_TM1CNT_LO:
715		GBATimerUpdateRegister(gba, 1, 4);
716		break;
717	case REG_TM2CNT_LO:
718		GBATimerUpdateRegister(gba, 2, 4);
719		break;
720	case REG_TM3CNT_LO:
721		GBATimerUpdateRegister(gba, 3, 4);
722		break;
723
724	case REG_KEYINPUT:
725		if (gba->rr && gba->rr->isPlaying(gba->rr)) {
726			return 0x3FF ^ gba->rr->queryInput(gba->rr);
727		} else {
728			uint16_t input = 0x3FF;
729			if (gba->keyCallback) {
730				input = gba->keyCallback->readKeys(gba->keyCallback);
731				if (gba->keySource) {
732					*gba->keySource = input;
733				}
734			} else if (gba->keySource) {
735				input = *gba->keySource;
736			}
737			if (!gba->allowOpposingDirections) {
738				unsigned rl = input & 0x030;
739				unsigned ud = input & 0x0C0;
740				input &= 0x30F;
741				if (rl != 0x030) {
742					input |= rl;
743				}
744				if (ud != 0x0C0) {
745					input |= ud;
746				}
747			}
748			if (gba->rr && gba->rr->isRecording(gba->rr)) {
749				gba->rr->logInput(gba->rr, input);
750			}
751			return 0x3FF ^ input;
752		}
753
754	case REG_SIOCNT:
755		return gba->sio.siocnt;
756	case REG_RCNT:
757		return gba->sio.rcnt;
758
759	case REG_BG0HOFS:
760	case REG_BG0VOFS:
761	case REG_BG1HOFS:
762	case REG_BG1VOFS:
763	case REG_BG2HOFS:
764	case REG_BG2VOFS:
765	case REG_BG3HOFS:
766	case REG_BG3VOFS:
767	case REG_BG2PA:
768	case REG_BG2PB:
769	case REG_BG2PC:
770	case REG_BG2PD:
771	case REG_BG2X_LO:
772	case REG_BG2X_HI:
773	case REG_BG2Y_LO:
774	case REG_BG2Y_HI:
775	case REG_BG3PA:
776	case REG_BG3PB:
777	case REG_BG3PC:
778	case REG_BG3PD:
779	case REG_BG3X_LO:
780	case REG_BG3X_HI:
781	case REG_BG3Y_LO:
782	case REG_BG3Y_HI:
783	case REG_WIN0H:
784	case REG_WIN1H:
785	case REG_WIN0V:
786	case REG_WIN1V:
787	case REG_MOSAIC:
788	case REG_BLDY:
789	case REG_FIFO_A_LO:
790	case REG_FIFO_A_HI:
791	case REG_FIFO_B_LO:
792	case REG_FIFO_B_HI:
793	case REG_DMA0SAD_LO:
794	case REG_DMA0SAD_HI:
795	case REG_DMA0DAD_LO:
796	case REG_DMA0DAD_HI:
797	case REG_DMA1SAD_LO:
798	case REG_DMA1SAD_HI:
799	case REG_DMA1DAD_LO:
800	case REG_DMA1DAD_HI:
801	case REG_DMA2SAD_LO:
802	case REG_DMA2SAD_HI:
803	case REG_DMA2DAD_LO:
804	case REG_DMA2DAD_HI:
805	case REG_DMA3SAD_LO:
806	case REG_DMA3SAD_HI:
807	case REG_DMA3DAD_LO:
808	case REG_DMA3DAD_HI:
809		// Write-only register
810		mLOG(GBA_IO, GAME_ERROR, "Read from write-only I/O register: %03X", address);
811		return GBALoadBad(gba->cpu);
812
813	case REG_DMA0CNT_LO:
814	case REG_DMA1CNT_LO:
815	case REG_DMA2CNT_LO:
816	case REG_DMA3CNT_LO:
817		// Write-only register
818		mLOG(GBA_IO, GAME_ERROR, "Read from write-only I/O register: %03X", address);
819		return 0;
820
821	case REG_JOY_RECV_LO:
822	case REG_JOY_RECV_HI:
823		gba->memory.io[REG_JOYSTAT >> 1] &= ~JOYSTAT_RECV_BIT;
824		break;
825
826	case REG_SOUNDBIAS:
827	case REG_POSTFLG:
828		mLOG(GBA_IO, STUB, "Stub I/O register read: %03x", address);
829		break;
830	case REG_SOUND1CNT_LO:
831	case REG_SOUND1CNT_HI:
832	case REG_SOUND1CNT_X:
833	case REG_SOUND2CNT_LO:
834	case REG_SOUND2CNT_HI:
835	case REG_SOUND3CNT_LO:
836	case REG_SOUND3CNT_HI:
837	case REG_SOUND3CNT_X:
838	case REG_SOUND4CNT_LO:
839	case REG_SOUND4CNT_HI:
840	case REG_SOUNDCNT_LO:
841	case REG_SOUNDCNT_HI:
842		if (!GBAudioEnableIsEnable(gba->memory.io[REG_SOUNDCNT_X >> 1])) {
843			// TODO: Is writing allowed when the circuit is disabled?
844			return 0;
845		}
846		// Fall through
847	case REG_DISPCNT:
848	case REG_DISPSTAT:
849	case REG_VCOUNT:
850	case REG_BG0CNT:
851	case REG_BG1CNT:
852	case REG_BG2CNT:
853	case REG_BG3CNT:
854	case REG_WININ:
855	case REG_WINOUT:
856	case REG_BLDCNT:
857	case REG_BLDALPHA:
858	case REG_SOUNDCNT_X:
859	case REG_WAVE_RAM0_LO:
860	case REG_WAVE_RAM0_HI:
861	case REG_WAVE_RAM1_LO:
862	case REG_WAVE_RAM1_HI:
863	case REG_WAVE_RAM2_LO:
864	case REG_WAVE_RAM2_HI:
865	case REG_WAVE_RAM3_LO:
866	case REG_WAVE_RAM3_HI:
867	case REG_DMA0CNT_HI:
868	case REG_DMA1CNT_HI:
869	case REG_DMA2CNT_HI:
870	case REG_DMA3CNT_HI:
871	case REG_TM0CNT_HI:
872	case REG_TM1CNT_HI:
873	case REG_TM2CNT_HI:
874	case REG_TM3CNT_HI:
875	case REG_KEYCNT:
876	case REG_SIOMULTI0:
877	case REG_SIOMULTI1:
878	case REG_SIOMULTI2:
879	case REG_SIOMULTI3:
880	case REG_SIOMLT_SEND:
881	case REG_JOYCNT:
882	case REG_JOY_TRANS_LO:
883	case REG_JOY_TRANS_HI:
884	case REG_JOYSTAT:
885	case REG_IE:
886	case REG_IF:
887	case REG_WAITCNT:
888	case REG_IME:
889		// Handled transparently by registers
890		break;
891	case REG_MAX:
892		// Some bad interrupt libraries will read from this
893	case 0x066:
894	case 0x06E:
895	case 0x076:
896	case 0x07A:
897	case 0x07E:
898	case 0x086:
899	case 0x08A:
900	case 0x136:
901	case 0x142:
902	case 0x15A:
903	case 0x206:
904		mLOG(GBA_IO, GAME_ERROR, "Read from unused I/O register: %03X", address);
905		return 0;
906	case REG_DEBUG_ENABLE:
907		if (gba->debug) {
908			return 0x1DEA;
909		}
910		// Fall through
911	default:
912		mLOG(GBA_IO, GAME_ERROR, "Read from unused I/O register: %03X", address);
913		return GBALoadBad(gba->cpu);
914	}
915	return gba->memory.io[address >> 1];
916}
917
918void GBAIOSerialize(struct GBA* gba, struct GBASerializedState* state) {
919	int i;
920	for (i = 0; i < REG_MAX; i += 2) {
921		if (_isRSpecialRegister[i >> 1]) {
922			STORE_16(gba->memory.io[i >> 1], i, state->io);
923		} else if (_isValidRegister[i >> 1]) {
924			uint16_t reg = GBAIORead(gba, i);
925			STORE_16(reg, i, state->io);
926		}
927	}
928
929	for (i = 0; i < 4; ++i) {
930		STORE_16(gba->memory.io[(REG_DMA0CNT_LO + i * 12) >> 1], (REG_DMA0CNT_LO + i * 12), state->io);
931		STORE_16(gba->timers[i].reload, 0, &state->timers[i].reload);
932		STORE_32(gba->timers[i].lastEvent - mTimingCurrentTime(&gba->timing), 0, &state->timers[i].lastEvent);
933		STORE_32(gba->timers[i].event.when - mTimingCurrentTime(&gba->timing), 0, &state->timers[i].nextEvent);
934		STORE_32(gba->timers[i].irq.when - mTimingCurrentTime(&gba->timing), 0, &state->timers[i].nextIrq);
935		STORE_32(gba->timers[i].flags, 0, &state->timers[i].flags);
936		STORE_32(gba->memory.dma[i].nextSource, 0, &state->dma[i].nextSource);
937		STORE_32(gba->memory.dma[i].nextDest, 0, &state->dma[i].nextDest);
938		STORE_32(gba->memory.dma[i].nextCount, 0, &state->dma[i].nextCount);
939		STORE_32(gba->memory.dma[i].when, 0, &state->dma[i].when);
940	}
941
942	state->dmaTransferRegister = gba->memory.dmaTransferRegister;
943
944	GBAHardwareSerialize(&gba->memory.hw, state);
945}
946
947void GBAIODeserialize(struct GBA* gba, const struct GBASerializedState* state) {
948	int i;
949	for (i = 0; i < REG_MAX; i += 2) {
950		if (_isWSpecialRegister[i >> 1]) {
951			LOAD_16(gba->memory.io[i >> 1], i, state->io);
952		} else if (_isValidRegister[i >> 1]) {
953			uint16_t reg;
954			LOAD_16(reg, i, state->io);
955			GBAIOWrite(gba, i, reg);
956		}
957	}
958
959	uint32_t when;
960	for (i = 0; i < 4; ++i) {
961		LOAD_16(gba->timers[i].reload, 0, &state->timers[i].reload);
962		LOAD_32(gba->timers[i].flags, 0, &state->timers[i].flags);
963		if (i > 0 && GBATimerFlagsIsCountUp(gba->timers[i].flags)) {
964			// Overwrite invalid values in savestate
965			gba->timers[i].lastEvent = 0;
966		} else {
967			LOAD_32(when, 0, &state->timers[i].lastEvent);
968			gba->timers[i].lastEvent = when + mTimingCurrentTime(&gba->timing);
969		}
970		LOAD_32(when, 0, &state->timers[i].nextEvent);
971		if (GBATimerFlagsIsEnable(gba->timers[i].flags)) {
972			mTimingSchedule(&gba->timing, &gba->timers[i].event, when);
973		}
974		LOAD_32(when, 0, &state->timers[i].nextIrq);
975		if (GBATimerFlagsIsIrqPending(gba->timers[i].flags)) {
976			mTimingSchedule(&gba->timing, &gba->timers[i].irq, when);
977		}
978
979		LOAD_16(gba->memory.dma[i].reg, (REG_DMA0CNT_HI + i * 12), state->io);
980		LOAD_32(gba->memory.dma[i].nextSource, 0, &state->dma[i].nextSource);
981		LOAD_32(gba->memory.dma[i].nextDest, 0, &state->dma[i].nextDest);
982		LOAD_32(gba->memory.dma[i].nextCount, 0, &state->dma[i].nextCount);
983		LOAD_32(gba->memory.dma[i].when, 0, &state->dma[i].when);
984		if (GBADMARegisterGetTiming(gba->memory.dma[i].reg) != GBA_DMA_TIMING_NOW) {
985			GBADMASchedule(gba, i, &gba->memory.dma[i]);
986		}
987	}
988	GBAAudioWriteSOUNDCNT_X(&gba->audio, gba->memory.io[REG_SOUNDCNT_X >> 1]);
989	gba->memory.dmaTransferRegister = state->dmaTransferRegister;
990	GBADMAUpdate(gba);
991	GBAHardwareDeserialize(&gba->memory.hw, state);
992}