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mGBA Game Boy Advance Emulator

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, savedata->realisticTiming);
 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, savedata->realisticTiming);
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(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 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, bool realisticTiming) {
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, realisticTiming);
207		break;
208	case SAVEDATA_EEPROM:
209		GBASavedataInitEEPROM(savedata, realisticTiming);
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, bool realisticTiming) {
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	savedata->realisticTiming = realisticTiming;
248	if (end < SIZE_CART_FLASH512) {
249		memset(&savedata->data[end], 0xFF, flashSize - end);
250	}
251}
252
253void GBASavedataInitEEPROM(struct GBASavedata* savedata, bool realisticTiming) {
254	if (savedata->type == SAVEDATA_AUTODETECT) {
255		savedata->type = SAVEDATA_EEPROM;
256	} else {
257		mLOG(GBA_SAVE, WARN, "Can't re-initialize savedata");
258		return;
259	}
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_EEPROM) {
267			savedata->vf->truncate(savedata->vf, SIZE_CART_EEPROM);
268		}
269		savedata->data = savedata->vf->map(savedata->vf, SIZE_CART_EEPROM, savedata->mapMode);
270	}
271	savedata->realisticTiming = realisticTiming;
272	if (end < SIZE_CART_EEPROM) {
273		memset(&savedata->data[end], 0xFF, SIZE_CART_EEPROM - end);
274	}
275}
276
277void GBASavedataInitSRAM(struct GBASavedata* savedata) {
278	if (savedata->type == SAVEDATA_AUTODETECT) {
279		savedata->type = SAVEDATA_SRAM;
280	} else {
281		mLOG(GBA_SAVE, WARN, "Can't re-initialize savedata");
282		return;
283	}
284	off_t end;
285	if (!savedata->vf) {
286		end = 0;
287		savedata->data = anonymousMemoryMap(SIZE_CART_SRAM);
288	} else {
289		end = savedata->vf->size(savedata->vf);
290		if (end < SIZE_CART_SRAM) {
291			savedata->vf->truncate(savedata->vf, SIZE_CART_SRAM);
292		}
293		savedata->data = savedata->vf->map(savedata->vf, SIZE_CART_SRAM, savedata->mapMode);
294	}
295
296	if (end < SIZE_CART_SRAM) {
297		memset(&savedata->data[end], 0xFF, SIZE_CART_SRAM - end);
298	}
299}
300
301uint8_t GBASavedataReadFlash(struct GBASavedata* savedata, uint16_t address) {
302	if (savedata->command == FLASH_COMMAND_ID) {
303		if (savedata->type == SAVEDATA_FLASH512) {
304			if (address < 2) {
305				return FLASH_MFG_PANASONIC >> (address * 8);
306			}
307		} else if (savedata->type == SAVEDATA_FLASH1M) {
308			if (address < 2) {
309				return FLASH_MFG_SANYO >> (address * 8);
310			}
311		}
312	}
313	if (mTimingIsScheduled(savedata->timing, &savedata->dust) && (address >> 12) == savedata->settling) {
314		return 0x5F;
315	}
316	return savedata->currentBank[address];
317}
318
319void GBASavedataWriteFlash(struct GBASavedata* savedata, uint16_t address, uint8_t value) {
320	switch (savedata->flashState) {
321	case FLASH_STATE_RAW:
322		switch (savedata->command) {
323		case FLASH_COMMAND_PROGRAM:
324			savedata->dirty |= SAVEDATA_DIRT_NEW;
325			savedata->currentBank[address] = value;
326			savedata->command = FLASH_COMMAND_NONE;
327			if (savedata->realisticTiming) {
328				mTimingDeschedule(savedata->timing, &savedata->dust);
329				mTimingSchedule(savedata->timing, &savedata->dust, FLASH_PROGRAM_CYCLES);
330			}
331			break;
332		case FLASH_COMMAND_SWITCH_BANK:
333			if (address == 0 && value < 2) {
334				_flashSwitchBank(savedata, value);
335			} else {
336				mLOG(GBA_SAVE, GAME_ERROR, "Bad flash bank switch");
337				savedata->command = FLASH_COMMAND_NONE;
338			}
339			savedata->command = FLASH_COMMAND_NONE;
340			break;
341		default:
342			if (address == FLASH_BASE_HI && value == FLASH_COMMAND_START) {
343				savedata->flashState = FLASH_STATE_START;
344			} else {
345				mLOG(GBA_SAVE, GAME_ERROR, "Bad flash write: %#04x = %#02x", address, value);
346			}
347			break;
348		}
349		break;
350	case FLASH_STATE_START:
351		if (address == FLASH_BASE_LO && value == FLASH_COMMAND_CONTINUE) {
352			savedata->flashState = FLASH_STATE_CONTINUE;
353		} else {
354			mLOG(GBA_SAVE, GAME_ERROR, "Bad flash write: %#04x = %#02x", address, value);
355			savedata->flashState = FLASH_STATE_RAW;
356		}
357		break;
358	case FLASH_STATE_CONTINUE:
359		savedata->flashState = FLASH_STATE_RAW;
360		if (address == FLASH_BASE_HI) {
361			switch (savedata->command) {
362			case FLASH_COMMAND_NONE:
363				switch (value) {
364				case FLASH_COMMAND_ERASE:
365				case FLASH_COMMAND_ID:
366				case FLASH_COMMAND_PROGRAM:
367				case FLASH_COMMAND_SWITCH_BANK:
368					savedata->command = value;
369					break;
370				default:
371					mLOG(GBA_SAVE, GAME_ERROR, "Unsupported flash operation: %#02x", value);
372					break;
373				}
374				break;
375			case FLASH_COMMAND_ERASE:
376				switch (value) {
377				case FLASH_COMMAND_ERASE_CHIP:
378					_flashErase(savedata);
379					break;
380				default:
381					mLOG(GBA_SAVE, GAME_ERROR, "Unsupported flash erase operation: %#02x", value);
382					break;
383				}
384				savedata->command = FLASH_COMMAND_NONE;
385				break;
386			case FLASH_COMMAND_ID:
387				if (value == FLASH_COMMAND_TERMINATE) {
388					savedata->command = FLASH_COMMAND_NONE;
389				}
390				break;
391			default:
392				mLOG(GBA_SAVE, ERROR, "Flash entered bad state: %#02x", savedata->command);
393				savedata->command = FLASH_COMMAND_NONE;
394				break;
395			}
396		} else if (savedata->command == FLASH_COMMAND_ERASE) {
397			if (value == FLASH_COMMAND_ERASE_SECTOR) {
398				_flashEraseSector(savedata, address);
399				savedata->command = FLASH_COMMAND_NONE;
400			} else {
401				mLOG(GBA_SAVE, GAME_ERROR, "Unsupported flash erase operation: %#02x", value);
402			}
403		}
404		break;
405	}
406}
407
408void GBASavedataWriteEEPROM(struct GBASavedata* savedata, uint16_t value, uint32_t writeSize) {
409	switch (savedata->command) {
410	// Read header
411	case EEPROM_COMMAND_NULL:
412	default:
413		savedata->command = value & 0x1;
414		break;
415	case EEPROM_COMMAND_PENDING:
416		savedata->command <<= 1;
417		savedata->command |= value & 0x1;
418		if (savedata->command == EEPROM_COMMAND_WRITE) {
419			savedata->writeAddress = 0;
420		} else {
421			savedata->readAddress = 0;
422		}
423		break;
424	// Do commands
425	case EEPROM_COMMAND_WRITE:
426		// Write
427		if (writeSize > 65) {
428			savedata->writeAddress <<= 1;
429			savedata->writeAddress |= (value & 0x1) << 6;
430		} else if (writeSize == 1) {
431			savedata->command = EEPROM_COMMAND_NULL;
432		} else if ((savedata->writeAddress >> 3) < SIZE_CART_EEPROM) {
433			uint8_t current = savedata->data[savedata->writeAddress >> 3];
434			current &= ~(1 << (0x7 - (savedata->writeAddress & 0x7)));
435			current |= (value & 0x1) << (0x7 - (savedata->writeAddress & 0x7));
436			savedata->dirty |= SAVEDATA_DIRT_NEW;
437			savedata->data[savedata->writeAddress >> 3] = current;
438			if (savedata->realisticTiming) {
439				mTimingDeschedule(savedata->timing, &savedata->dust);
440				mTimingSchedule(savedata->timing, &savedata->dust, EEPROM_SETTLE_CYCLES);
441			}
442			++savedata->writeAddress;
443		} else {
444			mLOG(GBA_SAVE, GAME_ERROR, "Writing beyond end of EEPROM: %08X", (savedata->writeAddress >> 3));
445		}
446		break;
447	case EEPROM_COMMAND_READ_PENDING:
448		// Read
449		if (writeSize > 1) {
450			savedata->readAddress <<= 1;
451			if (value & 0x1) {
452				savedata->readAddress |= 0x40;
453			}
454		} else {
455			savedata->readBitsRemaining = 68;
456			savedata->command = EEPROM_COMMAND_READ;
457		}
458		break;
459	}
460}
461
462uint16_t GBASavedataReadEEPROM(struct GBASavedata* savedata) {
463	if (savedata->command != EEPROM_COMMAND_READ) {
464		if (!savedata->realisticTiming || !mTimingIsScheduled(savedata->timing, &savedata->dust)) {
465			return 1;
466		} else {
467			return 0;
468		}
469	}
470	--savedata->readBitsRemaining;
471	if (savedata->readBitsRemaining < 64) {
472		int step = 63 - savedata->readBitsRemaining;
473		uint32_t address = (savedata->readAddress + step) >> 3;
474		if (address >= SIZE_CART_EEPROM) {
475			mLOG(GBA_SAVE, GAME_ERROR, "Reading beyond end of EEPROM: %08X", address);
476			return 0xFF;
477		}
478		uint8_t data = savedata->data[address] >> (0x7 - (step & 0x7));
479		if (!savedata->readBitsRemaining) {
480			savedata->command = EEPROM_COMMAND_NULL;
481		}
482		return data & 0x1;
483	}
484	return 0;
485}
486
487void GBASavedataClean(struct GBASavedata* savedata, uint32_t frameCount) {
488	if (!savedata->vf) {
489		return;
490	}
491	if (savedata->dirty & SAVEDATA_DIRT_NEW) {
492		savedata->dirtAge = frameCount;
493		savedata->dirty &= ~SAVEDATA_DIRT_NEW;
494		if (!(savedata->dirty & SAVEDATA_DIRT_SEEN)) {
495			savedata->dirty |= SAVEDATA_DIRT_SEEN;
496		}
497	} else if ((savedata->dirty & SAVEDATA_DIRT_SEEN) && frameCount - savedata->dirtAge > CLEANUP_THRESHOLD) {
498		if (savedata->maskWriteback) {
499			GBASavedataUnmask(savedata);
500		}
501		size_t size = GBASavedataSize(savedata);
502		savedata->dirty = 0;
503		if (savedata->data && savedata->vf->sync(savedata->vf, savedata->data, size)) {
504			mLOG(GBA_SAVE, INFO, "Savedata synced");
505		} else {
506			mLOG(GBA_SAVE, INFO, "Savedata failed to sync!");
507		}
508	}
509}
510
511void GBASavedataSerialize(const struct GBASavedata* savedata, struct GBASerializedState* state) {
512	state->savedata.type = savedata->type;
513	state->savedata.command = savedata->command;
514	GBASerializedSavedataFlags flags = 0;
515	flags = GBASerializedSavedataFlagsSetFlashState(flags, savedata->flashState);
516	flags = GBASerializedSavedataFlagsTestFillFlashBank(flags, savedata->currentBank == &savedata->data[0x10000]);
517
518	if (mTimingIsScheduled(savedata->timing, &savedata->dust)) {
519		STORE_32(savedata->dust.when - mTimingCurrentTime(savedata->timing), 0, &state->savedata.settlingDust);
520		flags = GBASerializedSavedataFlagsFillDustSettling(flags);
521	}
522
523	state->savedata.flags = flags;
524	state->savedata.readBitsRemaining = savedata->readBitsRemaining;
525	STORE_32(savedata->readAddress, 0, &state->savedata.readAddress);
526	STORE_32(savedata->writeAddress, 0, &state->savedata.writeAddress);
527	STORE_16(savedata->settling, 0, &state->savedata.settlingSector);
528
529}
530
531void GBASavedataDeserialize(struct GBASavedata* savedata, const struct GBASerializedState* state) {
532	if (savedata->type != state->savedata.type) {
533		mLOG(GBA_SAVE, DEBUG, "Switching save types");
534		GBASavedataForceType(savedata, state->savedata.type, savedata->realisticTiming);
535	}
536	savedata->command = state->savedata.command;
537	GBASerializedSavedataFlags flags = state->savedata.flags;
538	savedata->flashState = GBASerializedSavedataFlagsGetFlashState(flags);
539	savedata->readBitsRemaining = state->savedata.readBitsRemaining;
540	LOAD_32(savedata->readAddress, 0, &state->savedata.readAddress);
541	LOAD_32(savedata->writeAddress, 0, &state->savedata.writeAddress);
542	LOAD_16(savedata->settling, 0, &state->savedata.settlingSector);
543
544	if (savedata->type == SAVEDATA_FLASH1M) {
545		_flashSwitchBank(savedata, GBASerializedSavedataFlagsGetFlashBank(flags));
546	}
547
548	if (GBASerializedSavedataFlagsIsDustSettling(flags)) {
549		uint32_t when;
550		LOAD_32(when, 0, &state->savedata.settlingDust);
551		mTimingSchedule(savedata->timing, &savedata->dust, when);
552	}
553}
554
555void _flashSwitchBank(struct GBASavedata* savedata, int bank) {
556	mLOG(GBA_SAVE, DEBUG, "Performing flash bank switch to bank %i", bank);
557	savedata->currentBank = &savedata->data[bank << 16];
558	if (bank > 0 && savedata->type == SAVEDATA_FLASH512) {
559		mLOG(GBA_SAVE, INFO, "Updating flash chip from 512kb to 1Mb");
560		savedata->type = SAVEDATA_FLASH1M;
561		if (savedata->vf && savedata->vf->size(savedata->vf) == SIZE_CART_FLASH512) {
562			savedata->vf->truncate(savedata->vf, SIZE_CART_FLASH1M);
563			memset(&savedata->data[SIZE_CART_FLASH512], 0xFF, SIZE_CART_FLASH512);
564		}
565	}
566}
567
568void _flashErase(struct GBASavedata* savedata) {
569	mLOG(GBA_SAVE, DEBUG, "Performing flash chip erase");
570	savedata->dirty |= SAVEDATA_DIRT_NEW;
571	size_t size = SIZE_CART_FLASH512;
572	if (savedata->type == SAVEDATA_FLASH1M) {
573		size = SIZE_CART_FLASH1M;
574	}
575	memset(savedata->data, 0xFF, size);
576}
577
578void _flashEraseSector(struct GBASavedata* savedata, uint16_t sectorStart) {
579	mLOG(GBA_SAVE, DEBUG, "Performing flash sector erase at 0x%04x", sectorStart);
580	savedata->dirty |= SAVEDATA_DIRT_NEW;
581	size_t size = 0x1000;
582	if (savedata->type == SAVEDATA_FLASH1M) {
583		mLOG(GBA_SAVE, DEBUG, "Performing unknown sector-size erase at 0x%04x", sectorStart);
584	}
585	savedata->settling = sectorStart >> 12;
586	if (savedata->realisticTiming) {
587		mTimingDeschedule(savedata->timing, &savedata->dust);
588		mTimingSchedule(savedata->timing, &savedata->dust, FLASH_ERASE_CYCLES);
589	}
590	memset(&savedata->currentBank[sectorStart & ~(size - 1)], 0xFF, size);
591}