src/gba/savedata.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/savedata.h>
7
8#include <mgba/internal/arm/macros.h>
9#include <mgba/internal/gba/gba.h>
10#include <mgba/internal/gba/serialize.h>
11
12#include <mgba-util/memory.h>
13#include <mgba-util/vfs.h>
14
15#include <errno.h>
16#include <fcntl.h>
17
18// Some testing was done here...
19// Erase cycles can vary greatly.
20// Some games may vary anywhere between about 2000 cycles to up to 30000 cycles. (Observed on a Macronix (09C2) chip).
21// Other games vary from very little, with a fairly solid 20500 cycle count. (Observed on a SST (D4BF) chip).
22// An average estimation is as follows.
23#define FLASH_ERASE_CYCLES 30000
24#define FLASH_PROGRAM_CYCLES 650
25// This needs real testing, and is only an estimation currently
26#define EEPROM_SETTLE_CYCLES 115000
27#define CLEANUP_THRESHOLD 15
28
29mLOG_DEFINE_CATEGORY(GBA_SAVE, "GBA Savedata", "gba.savedata");
30
31static void _flashSwitchBank(struct GBASavedata* savedata, int bank);
32static void _flashErase(struct GBASavedata* savedata);
33static void _flashEraseSector(struct GBASavedata* savedata, uint16_t sectorStart);
34
35static void _ashesToAshes(struct mTiming* timing, void* user, uint32_t cyclesLate) {
36 UNUSED(timing);
37 UNUSED(user);
38 UNUSED(cyclesLate);
39 // Funk to funky
40}
41
42void GBASavedataInit(struct GBASavedata* savedata, struct VFile* vf) {
43 savedata->type = SAVEDATA_AUTODETECT;
44 savedata->data = 0;
45 savedata->command = EEPROM_COMMAND_NULL;
46 savedata->flashState = FLASH_STATE_RAW;
47 savedata->vf = vf;
48 savedata->realVf = vf;
49 savedata->mapMode = MAP_WRITE;
50 savedata->dirty = 0;
51 savedata->dirtAge = 0;
52 savedata->dust.name = "GBA Savedata Settling";
53 savedata->dust.priority = 0x70;
54 savedata->dust.context = savedata;
55 savedata->dust.callback = _ashesToAshes;
56}
57
58void GBASavedataDeinit(struct GBASavedata* savedata) {
59 if (savedata->vf) {
60 size_t size = GBASavedataSize(savedata);
61 if (savedata->data) {
62 savedata->vf->unmap(savedata->vf, savedata->data, size);
63 }
64 savedata->vf = NULL;
65 } else {
66 switch (savedata->type) {
67 case SAVEDATA_SRAM:
68 mappedMemoryFree(savedata->data, SIZE_CART_SRAM);
69 break;
70 case SAVEDATA_FLASH512:
71 mappedMemoryFree(savedata->data, SIZE_CART_FLASH512);
72 break;
73 case SAVEDATA_FLASH1M:
74 mappedMemoryFree(savedata->data, SIZE_CART_FLASH1M);
75 break;
76 case SAVEDATA_EEPROM:
77 mappedMemoryFree(savedata->data, SIZE_CART_EEPROM);
78 break;
79 case SAVEDATA_FORCE_NONE:
80 case SAVEDATA_AUTODETECT:
81 break;
82 }
83 }
84 savedata->data = 0;
85 savedata->type = SAVEDATA_AUTODETECT;
86}
87
88void GBASavedataMask(struct GBASavedata* savedata, struct VFile* vf, bool writeback) {
89 enum SavedataType type = savedata->type;
90 GBASavedataDeinit(savedata);
91 savedata->vf = vf;
92 savedata->mapMode = MAP_READ;
93 savedata->maskWriteback = writeback;
94 GBASavedataForceType(savedata, type);
95}
96
97void GBASavedataUnmask(struct GBASavedata* savedata) {
98 if (savedata->vf == savedata->realVf) {
99 return;
100 }
101 enum SavedataType type = savedata->type;
102 struct VFile* vf = savedata->vf;
103 GBASavedataDeinit(savedata);
104 savedata->vf = savedata->realVf;
105 savedata->mapMode = MAP_WRITE;
106 GBASavedataForceType(savedata, type);
107 if (savedata->maskWriteback) {
108 GBASavedataLoad(savedata, vf);
109 savedata->maskWriteback = false;
110 }
111 vf->close(vf);
112}
113
114bool GBASavedataClone(struct GBASavedata* savedata, struct VFile* out) {
115 if (savedata->data) {
116 switch (savedata->type) {
117 case SAVEDATA_SRAM:
118 return out->write(out, savedata->data, SIZE_CART_SRAM) == SIZE_CART_SRAM;
119 case SAVEDATA_FLASH512:
120 return out->write(out, savedata->data, SIZE_CART_FLASH512) == SIZE_CART_FLASH512;
121 case SAVEDATA_FLASH1M:
122 return out->write(out, savedata->data, SIZE_CART_FLASH1M) == SIZE_CART_FLASH1M;
123 case SAVEDATA_EEPROM:
124 return out->write(out, savedata->data, SIZE_CART_EEPROM) == SIZE_CART_EEPROM;
125 case SAVEDATA_AUTODETECT:
126 case SAVEDATA_FORCE_NONE:
127 return true;
128 }
129 } else if (savedata->vf) {
130 off_t read = 0;
131 uint8_t buffer[2048];
132 do {
133 read = savedata->vf->read(savedata->vf, buffer, sizeof(buffer));
134 out->write(out, buffer, read);
135 } while (read == sizeof(buffer));
136 return read >= 0;
137 }
138 return true;
139}
140
141size_t GBASavedataSize(const struct GBASavedata* savedata) {
142 switch (savedata->type) {
143 case SAVEDATA_SRAM:
144 return SIZE_CART_SRAM;
145 case SAVEDATA_FLASH512:
146 return SIZE_CART_FLASH512;
147 case SAVEDATA_FLASH1M:
148 return SIZE_CART_FLASH1M;
149 case SAVEDATA_EEPROM:
150 return (savedata->vf && savedata->vf->size(savedata->vf) == SIZE_CART_EEPROM512) ? SIZE_CART_EEPROM512 : SIZE_CART_EEPROM;
151 case SAVEDATA_FORCE_NONE:
152 return 0;
153 case SAVEDATA_AUTODETECT:
154 default:
155 if (savedata->vf) {
156 return savedata->vf->size(savedata->vf);
157 }
158 return 0;
159 }
160}
161
162bool GBASavedataLoad(struct GBASavedata* savedata, struct VFile* in) {
163 if (savedata->data) {
164 if (!in && savedata->type != SAVEDATA_FORCE_NONE) {
165 return false;
166 }
167 ssize_t size = GBASavedataSize(savedata);
168 in->seek(in, 0, SEEK_SET);
169 return in->read(in, savedata->data, size) == size;
170 } else if (savedata->vf) {
171 off_t read = 0;
172 uint8_t buffer[2048];
173 savedata->vf->seek(savedata->vf, 0, SEEK_SET);
174 if (in) {
175 in->seek(in, 0, SEEK_SET);
176 do {
177 read = in->read(in, buffer, sizeof(buffer));
178 read = savedata->vf->write(savedata->vf, buffer, read);
179 } while (read == sizeof(buffer));
180 }
181 memset(buffer, 0xFF, sizeof(buffer));
182 ssize_t fsize = savedata->vf->size(savedata->vf);
183 ssize_t pos = savedata->vf->seek(savedata->vf, 0, SEEK_CUR);
184 while (fsize - pos >= (ssize_t) sizeof(buffer)) {
185 savedata->vf->write(savedata->vf, buffer, sizeof(buffer));
186 pos = savedata->vf->seek(savedata->vf, 0, SEEK_CUR);
187 }
188 if (fsize - pos > 0) {
189 savedata->vf->write(savedata->vf, buffer, fsize - pos);
190 }
191 return read >= 0;
192 }
193 return true;
194}
195
196void GBASavedataForceType(struct GBASavedata* savedata, enum SavedataType type) {
197 if (savedata->type != SAVEDATA_AUTODETECT) {
198 struct VFile* vf = savedata->vf;
199 GBASavedataDeinit(savedata);
200 GBASavedataInit(savedata, vf);
201 }
202 switch (type) {
203 case SAVEDATA_FLASH512:
204 case SAVEDATA_FLASH1M:
205 savedata->type = type;
206 GBASavedataInitFlash(savedata);
207 break;
208 case SAVEDATA_EEPROM:
209 GBASavedataInitEEPROM(savedata);
210 break;
211 case SAVEDATA_SRAM:
212 GBASavedataInitSRAM(savedata);
213 break;
214 case SAVEDATA_FORCE_NONE:
215 savedata->type = SAVEDATA_FORCE_NONE;
216 break;
217 case SAVEDATA_AUTODETECT:
218 break;
219 }
220}
221
222void GBASavedataInitFlash(struct GBASavedata* savedata) {
223 if (savedata->type == SAVEDATA_AUTODETECT) {
224 savedata->type = SAVEDATA_FLASH512;
225 }
226 if (savedata->type != SAVEDATA_FLASH512 && savedata->type != SAVEDATA_FLASH1M) {
227 mLOG(GBA_SAVE, WARN, "Can't re-initialize savedata");
228 return;
229 }
230 int32_t flashSize = SIZE_CART_FLASH512;
231 if (savedata->type == SAVEDATA_FLASH1M) {
232 flashSize = SIZE_CART_FLASH1M;
233 }
234 off_t end;
235 if (!savedata->vf) {
236 end = 0;
237 savedata->data = anonymousMemoryMap(SIZE_CART_FLASH1M);
238 } else {
239 end = savedata->vf->size(savedata->vf);
240 if (end < flashSize) {
241 savedata->vf->truncate(savedata->vf, flashSize);
242 }
243 savedata->data = savedata->vf->map(savedata->vf, flashSize, savedata->mapMode);
244 }
245
246 savedata->currentBank = savedata->data;
247 if (end < SIZE_CART_FLASH512) {
248 memset(&savedata->data[end], 0xFF, flashSize - end);
249 }
250}
251
252void GBASavedataInitEEPROM(struct GBASavedata* savedata) {
253 if (savedata->type == SAVEDATA_AUTODETECT) {
254 savedata->type = SAVEDATA_EEPROM;
255 } else {
256 mLOG(GBA_SAVE, WARN, "Can't re-initialize savedata");
257 return;
258 }
259 int32_t eepromSize = SIZE_CART_EEPROM512;
260 off_t end;
261 if (!savedata->vf) {
262 end = 0;
263 savedata->data = anonymousMemoryMap(SIZE_CART_EEPROM);
264 } else {
265 end = savedata->vf->size(savedata->vf);
266 if (end < SIZE_CART_EEPROM512) {
267 savedata->vf->truncate(savedata->vf, SIZE_CART_EEPROM512);
268 } else if (end > SIZE_CART_EEPROM512) {
269 eepromSize = SIZE_CART_EEPROM;
270 }
271 savedata->data = savedata->vf->map(savedata->vf, eepromSize, savedata->mapMode);
272 }
273 if (end < SIZE_CART_EEPROM512) {
274 memset(&savedata->data[end], 0xFF, SIZE_CART_EEPROM512 - end);
275 }
276}
277
278void GBASavedataInitSRAM(struct GBASavedata* savedata) {
279 if (savedata->type == SAVEDATA_AUTODETECT) {
280 savedata->type = SAVEDATA_SRAM;
281 } else {
282 mLOG(GBA_SAVE, WARN, "Can't re-initialize savedata");
283 return;
284 }
285 off_t end;
286 if (!savedata->vf) {
287 end = 0;
288 savedata->data = anonymousMemoryMap(SIZE_CART_SRAM);
289 } else {
290 end = savedata->vf->size(savedata->vf);
291 if (end < SIZE_CART_SRAM) {
292 savedata->vf->truncate(savedata->vf, SIZE_CART_SRAM);
293 }
294 savedata->data = savedata->vf->map(savedata->vf, SIZE_CART_SRAM, savedata->mapMode);
295 }
296
297 if (end < SIZE_CART_SRAM) {
298 memset(&savedata->data[end], 0xFF, SIZE_CART_SRAM - end);
299 }
300}
301
302uint8_t GBASavedataReadFlash(struct GBASavedata* savedata, uint16_t address) {
303 if (savedata->command == FLASH_COMMAND_ID) {
304 if (savedata->type == SAVEDATA_FLASH512) {
305 if (address < 2) {
306 return FLASH_MFG_PANASONIC >> (address * 8);
307 }
308 } else if (savedata->type == SAVEDATA_FLASH1M) {
309 if (address < 2) {
310 return FLASH_MFG_SANYO >> (address * 8);
311 }
312 }
313 }
314 if (mTimingIsScheduled(savedata->timing, &savedata->dust) && (address >> 12) == savedata->settling) {
315 return 0x5F;
316 }
317 return savedata->currentBank[address];
318}
319
320void GBASavedataWriteFlash(struct GBASavedata* savedata, uint16_t address, uint8_t value) {
321 switch (savedata->flashState) {
322 case FLASH_STATE_RAW:
323 switch (savedata->command) {
324 case FLASH_COMMAND_PROGRAM:
325 savedata->dirty |= SAVEDATA_DIRT_NEW;
326 savedata->currentBank[address] = value;
327 savedata->command = FLASH_COMMAND_NONE;
328 mTimingDeschedule(savedata->timing, &savedata->dust);
329 mTimingSchedule(savedata->timing, &savedata->dust, FLASH_PROGRAM_CYCLES);
330 break;
331 case FLASH_COMMAND_SWITCH_BANK:
332 if (address == 0 && value < 2) {
333 _flashSwitchBank(savedata, value);
334 } else {
335 mLOG(GBA_SAVE, GAME_ERROR, "Bad flash bank switch");
336 savedata->command = FLASH_COMMAND_NONE;
337 }
338 savedata->command = FLASH_COMMAND_NONE;
339 break;
340 default:
341 if (address == FLASH_BASE_HI && value == FLASH_COMMAND_START) {
342 savedata->flashState = FLASH_STATE_START;
343 } else {
344 mLOG(GBA_SAVE, GAME_ERROR, "Bad flash write: %#04x = %#02x", address, value);
345 }
346 break;
347 }
348 break;
349 case FLASH_STATE_START:
350 if (address == FLASH_BASE_LO && value == FLASH_COMMAND_CONTINUE) {
351 savedata->flashState = FLASH_STATE_CONTINUE;
352 } else {
353 mLOG(GBA_SAVE, GAME_ERROR, "Bad flash write: %#04x = %#02x", address, value);
354 savedata->flashState = FLASH_STATE_RAW;
355 }
356 break;
357 case FLASH_STATE_CONTINUE:
358 savedata->flashState = FLASH_STATE_RAW;
359 if (address == FLASH_BASE_HI) {
360 switch (savedata->command) {
361 case FLASH_COMMAND_NONE:
362 switch (value) {
363 case FLASH_COMMAND_ERASE:
364 case FLASH_COMMAND_ID:
365 case FLASH_COMMAND_PROGRAM:
366 case FLASH_COMMAND_SWITCH_BANK:
367 savedata->command = value;
368 break;
369 default:
370 mLOG(GBA_SAVE, GAME_ERROR, "Unsupported flash operation: %#02x", value);
371 break;
372 }
373 break;
374 case FLASH_COMMAND_ERASE:
375 switch (value) {
376 case FLASH_COMMAND_ERASE_CHIP:
377 _flashErase(savedata);
378 break;
379 default:
380 mLOG(GBA_SAVE, GAME_ERROR, "Unsupported flash erase operation: %#02x", value);
381 break;
382 }
383 savedata->command = FLASH_COMMAND_NONE;
384 break;
385 case FLASH_COMMAND_ID:
386 if (value == FLASH_COMMAND_TERMINATE) {
387 savedata->command = FLASH_COMMAND_NONE;
388 }
389 break;
390 default:
391 mLOG(GBA_SAVE, ERROR, "Flash entered bad state: %#02x", savedata->command);
392 savedata->command = FLASH_COMMAND_NONE;
393 break;
394 }
395 } else if (savedata->command == FLASH_COMMAND_ERASE) {
396 if (value == FLASH_COMMAND_ERASE_SECTOR) {
397 _flashEraseSector(savedata, address);
398 savedata->command = FLASH_COMMAND_NONE;
399 } else {
400 mLOG(GBA_SAVE, GAME_ERROR, "Unsupported flash erase operation: %#02x", value);
401 }
402 }
403 break;
404 }
405}
406
407static void _ensureEeprom(struct GBASavedata* savedata, uint32_t size) {
408 if (size < SIZE_CART_EEPROM512) {
409 return;
410 }
411 if (!savedata->vf || savedata->vf->size(savedata->vf) > SIZE_CART_EEPROM512) {
412 return;
413 }
414 savedata->vf->unmap(savedata->vf, savedata->data, SIZE_CART_EEPROM512);
415 savedata->vf->truncate(savedata->vf, SIZE_CART_EEPROM);
416 savedata->data = savedata->vf->map(savedata->vf, SIZE_CART_EEPROM, savedata->mapMode);
417 memset(&savedata->data[SIZE_CART_EEPROM512], 0xFF, SIZE_CART_EEPROM - SIZE_CART_EEPROM512);
418}
419
420void GBASavedataWriteEEPROM(struct GBASavedata* savedata, uint16_t value, uint32_t writeSize) {
421 switch (savedata->command) {
422 // Read header
423 case EEPROM_COMMAND_NULL:
424 default:
425 savedata->command = value & 0x1;
426 break;
427 case EEPROM_COMMAND_PENDING:
428 savedata->command <<= 1;
429 savedata->command |= value & 0x1;
430 if (savedata->command == EEPROM_COMMAND_WRITE) {
431 savedata->writeAddress = 0;
432 } else {
433 savedata->readAddress = 0;
434 }
435 break;
436 // Do commands
437 case EEPROM_COMMAND_WRITE:
438 // Write
439 if (writeSize > 65) {
440 savedata->writeAddress <<= 1;
441 savedata->writeAddress |= (value & 0x1) << 6;
442 } else if (writeSize == 1) {
443 savedata->command = EEPROM_COMMAND_NULL;
444 } else if ((savedata->writeAddress >> 3) < SIZE_CART_EEPROM) {
445 _ensureEeprom(savedata, savedata->writeAddress >> 3);
446 uint8_t current = savedata->data[savedata->writeAddress >> 3];
447 current &= ~(1 << (0x7 - (savedata->writeAddress & 0x7)));
448 current |= (value & 0x1) << (0x7 - (savedata->writeAddress & 0x7));
449 savedata->dirty |= SAVEDATA_DIRT_NEW;
450 savedata->data[savedata->writeAddress >> 3] = current;
451 mTimingDeschedule(savedata->timing, &savedata->dust);
452 mTimingSchedule(savedata->timing, &savedata->dust, EEPROM_SETTLE_CYCLES);
453 ++savedata->writeAddress;
454 } else {
455 mLOG(GBA_SAVE, GAME_ERROR, "Writing beyond end of EEPROM: %08X", (savedata->writeAddress >> 3));
456 }
457 break;
458 case EEPROM_COMMAND_READ_PENDING:
459 // Read
460 if (writeSize > 1) {
461 savedata->readAddress <<= 1;
462 if (value & 0x1) {
463 savedata->readAddress |= 0x40;
464 }
465 } else {
466 savedata->readBitsRemaining = 68;
467 savedata->command = EEPROM_COMMAND_READ;
468 }
469 break;
470 }
471}
472
473uint16_t GBASavedataReadEEPROM(struct GBASavedata* savedata) {
474 if (savedata->command != EEPROM_COMMAND_READ) {
475 if (!mTimingIsScheduled(savedata->timing, &savedata->dust)) {
476 return 1;
477 } else {
478 return 0;
479 }
480 }
481 --savedata->readBitsRemaining;
482 if (savedata->readBitsRemaining < 64) {
483 int step = 63 - savedata->readBitsRemaining;
484 uint32_t address = (savedata->readAddress + step) >> 3;
485 _ensureEeprom(savedata, address);
486 if (address >= SIZE_CART_EEPROM) {
487 mLOG(GBA_SAVE, GAME_ERROR, "Reading beyond end of EEPROM: %08X", address);
488 return 0xFF;
489 }
490 uint8_t data = savedata->data[address] >> (0x7 - (step & 0x7));
491 if (!savedata->readBitsRemaining) {
492 savedata->command = EEPROM_COMMAND_NULL;
493 }
494 return data & 0x1;
495 }
496 return 0;
497}
498
499void GBASavedataClean(struct GBASavedata* savedata, uint32_t frameCount) {
500 if (!savedata->vf) {
501 return;
502 }
503 if (savedata->dirty & SAVEDATA_DIRT_NEW) {
504 savedata->dirtAge = frameCount;
505 savedata->dirty &= ~SAVEDATA_DIRT_NEW;
506 if (!(savedata->dirty & SAVEDATA_DIRT_SEEN)) {
507 savedata->dirty |= SAVEDATA_DIRT_SEEN;
508 }
509 } else if ((savedata->dirty & SAVEDATA_DIRT_SEEN) && frameCount - savedata->dirtAge > CLEANUP_THRESHOLD) {
510 if (savedata->maskWriteback) {
511 GBASavedataUnmask(savedata);
512 }
513 if (savedata->mapMode & MAP_WRITE) {
514 size_t size = GBASavedataSize(savedata);
515 savedata->dirty = 0;
516 if (savedata->data && savedata->vf->sync(savedata->vf, savedata->data, size)) {
517 mLOG(GBA_SAVE, INFO, "Savedata synced");
518 } else {
519 mLOG(GBA_SAVE, INFO, "Savedata failed to sync!");
520 }
521 }
522 }
523}
524
525void GBASavedataSerialize(const struct GBASavedata* savedata, struct GBASerializedState* state) {
526 state->savedata.type = savedata->type;
527 state->savedata.command = savedata->command;
528 GBASerializedSavedataFlags flags = 0;
529 flags = GBASerializedSavedataFlagsSetFlashState(flags, savedata->flashState);
530 flags = GBASerializedSavedataFlagsTestFillFlashBank(flags, savedata->currentBank == &savedata->data[0x10000]);
531
532 if (mTimingIsScheduled(savedata->timing, &savedata->dust)) {
533 STORE_32(savedata->dust.when - mTimingCurrentTime(savedata->timing), 0, &state->savedata.settlingDust);
534 flags = GBASerializedSavedataFlagsFillDustSettling(flags);
535 }
536
537 state->savedata.flags = flags;
538 state->savedata.readBitsRemaining = savedata->readBitsRemaining;
539 STORE_32(savedata->readAddress, 0, &state->savedata.readAddress);
540 STORE_32(savedata->writeAddress, 0, &state->savedata.writeAddress);
541 STORE_16(savedata->settling, 0, &state->savedata.settlingSector);
542
543}
544
545void GBASavedataDeserialize(struct GBASavedata* savedata, const struct GBASerializedState* state) {
546 if (savedata->type != state->savedata.type) {
547 mLOG(GBA_SAVE, DEBUG, "Switching save types");
548 GBASavedataForceType(savedata, state->savedata.type);
549 }
550 savedata->command = state->savedata.command;
551 GBASerializedSavedataFlags flags = state->savedata.flags;
552 savedata->flashState = GBASerializedSavedataFlagsGetFlashState(flags);
553 savedata->readBitsRemaining = state->savedata.readBitsRemaining;
554 LOAD_32(savedata->readAddress, 0, &state->savedata.readAddress);
555 LOAD_32(savedata->writeAddress, 0, &state->savedata.writeAddress);
556 LOAD_16(savedata->settling, 0, &state->savedata.settlingSector);
557
558 if (savedata->type == SAVEDATA_FLASH1M) {
559 _flashSwitchBank(savedata, GBASerializedSavedataFlagsGetFlashBank(flags));
560 }
561
562 if (GBASerializedSavedataFlagsIsDustSettling(flags)) {
563 uint32_t when;
564 LOAD_32(when, 0, &state->savedata.settlingDust);
565 mTimingSchedule(savedata->timing, &savedata->dust, when);
566 }
567}
568
569void _flashSwitchBank(struct GBASavedata* savedata, int bank) {
570 mLOG(GBA_SAVE, DEBUG, "Performing flash bank switch to bank %i", bank);
571 savedata->currentBank = &savedata->data[bank << 16];
572 if (bank > 0 && savedata->type == SAVEDATA_FLASH512) {
573 mLOG(GBA_SAVE, INFO, "Updating flash chip from 512kb to 1Mb");
574 savedata->type = SAVEDATA_FLASH1M;
575 if (savedata->vf) {
576 savedata->vf->unmap(savedata->vf, savedata->data, SIZE_CART_FLASH512);
577 if (savedata->vf->size(savedata->vf) == SIZE_CART_FLASH512) {
578 savedata->vf->truncate(savedata->vf, SIZE_CART_FLASH1M);
579 savedata->data = savedata->vf->map(savedata->vf, SIZE_CART_FLASH1M, MAP_WRITE);
580 memset(&savedata->data[SIZE_CART_FLASH512], 0xFF, SIZE_CART_FLASH512);
581 } else {
582 savedata->data = savedata->vf->map(savedata->vf, SIZE_CART_FLASH1M, MAP_WRITE);
583 }
584 }
585 }
586}
587
588void _flashErase(struct GBASavedata* savedata) {
589 mLOG(GBA_SAVE, DEBUG, "Performing flash chip erase");
590 savedata->dirty |= SAVEDATA_DIRT_NEW;
591 size_t size = SIZE_CART_FLASH512;
592 if (savedata->type == SAVEDATA_FLASH1M) {
593 size = SIZE_CART_FLASH1M;
594 }
595 memset(savedata->data, 0xFF, size);
596}
597
598void _flashEraseSector(struct GBASavedata* savedata, uint16_t sectorStart) {
599 mLOG(GBA_SAVE, DEBUG, "Performing flash sector erase at 0x%04x", sectorStart);
600 savedata->dirty |= SAVEDATA_DIRT_NEW;
601 size_t size = 0x1000;
602 if (savedata->type == SAVEDATA_FLASH1M) {
603 mLOG(GBA_SAVE, DEBUG, "Performing unknown sector-size erase at 0x%04x", sectorStart);
604 }
605 savedata->settling = sectorStart >> 12;
606 mTimingDeschedule(savedata->timing, &savedata->dust);
607 mTimingSchedule(savedata->timing, &savedata->dust, FLASH_ERASE_CYCLES);
608 memset(&savedata->currentBank[sectorStart & ~(size - 1)], 0xFF, size);
609}