ShuriZma
/
mgba
mirror of https://github.com/mgba-emu/mgba.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Support flash game saves

This commit is contained in:
Jeffrey Pfau 2013-09-23 23:04:15 -07:00
parent abc89982be
commit cec9e67d88
4 changed files with 168 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/gba/gba-memory.c
View File

@ -273,8 +273,11 @@ int8_t GBALoad8(struct ARMMemory* memory, uint32_t address, int* cycleCounter) {
if (gbaMemory->savedata.type == SAVEDATA_NONE) {
GBASavedataInit(&gbaMemory->savedata, gbaMemory->p->savefile);
GBASavedataInitSRAM(&gbaMemory->savedata);
} else if (gbaMemory->savedata.type == SAVEDATA_SRAM) {
value = gbaMemory->savedata.data[address & (SIZE_CART_SRAM - 1)];
} else if (gbaMemory->savedata.type == SAVEDATA_FLASH512 || gbaMemory->savedata.type == SAVEDATA_FLASH1M) {
value = GBASavedataReadFlash(&gbaMemory->savedata, address);
}
value = gbaMemory->savedata.data[address & (SIZE_CART_SRAM - 1)];
default:
break;
}
@ -409,7 +412,7 @@ void GBAStore8(struct ARMMemory* memory, uint32_t address, int8_t value, int* cy
}
}
if (gbaMemory->savedata.type == SAVEDATA_FLASH512 || gbaMemory->savedata.type == SAVEDATA_FLASH1M) {
GBASavedataWriteFlash(&gbaMemory->savedata, value);
GBASavedataWriteFlash(&gbaMemory->savedata, address, value);
} else if (gbaMemory->savedata.type == SAVEDATA_SRAM) {
gbaMemory->savedata.data[address & (SIZE_CART_SRAM - 1)] = value;
}

129
src/gba/gba-savedata.c
View File

@ -8,9 +8,15 @@
#include <sys/mman.h>
#include <unistd.h>
static void _flashSwitchBank(struct GBASavedata* savedata, int bank);
static void _flashErase(struct GBASavedata* savedata);
static void _flashEraseSector(struct GBASavedata* savedata, uint16_t sectorStart);
void GBASavedataInit(struct GBASavedata* savedata, const char* filename) {
savedata->type = SAVEDATA_NONE;
savedata->data = 0;
savedata->command = EEPROM_COMMAND_NULL;
savedata->flashState = FLASH_STATE_RAW;
savedata->fd = -1;
savedata->filename = filename;
}
@ -53,6 +59,7 @@ void GBASavedataInitFlash(struct GBASavedata* savedata) {
}
// mmap enough so that we can expand the file if we need to
savedata->data = mmap(0, SIZE_CART_FLASH1M, PROT_READ | PROT_WRITE, flags, savedata->fd, 0);
savedata->currentBank = savedata->data;
if (end < SIZE_CART_FLASH512) {
memset(&savedata->data[end], 0xFF, SIZE_CART_FLASH512 - end);
}
@ -100,11 +107,102 @@ void GBASavedataInitSRAM(struct GBASavedata* savedata) {
}
}
uint8_t GBASavedataReadFlash(struct GBASavedata* savedata, uint16_t address) {
if (savedata->command == FLASH_COMMAND_ID) {
if (savedata->type == SAVEDATA_FLASH512) {
if (address < 2) {
return FLASH_MFG_PANASONIC >> (address * 8);
}
} else if (savedata->type == SAVEDATA_FLASH1M) {
if (address < 2) {
return FLASH_MFG_SANYO >> (address * 8);
}
}
}
return savedata->currentBank[address];
}
void GBASavedataWriteFlash(struct GBASavedata* savedata, uint8_t value) {
(void)(savedata);
(void)(value);
GBALog(0, GBA_LOG_STUB, "Flash memory unimplemented");
void GBASavedataWriteFlash(struct GBASavedata* savedata, uint16_t address, uint8_t value) {
switch (savedata->flashState) {
case FLASH_STATE_RAW:
switch (savedata->command) {
case FLASH_COMMAND_PROGRAM:
savedata->currentBank[address] = value;
savedata->command = FLASH_COMMAND_NONE;
break;
case FLASH_COMMAND_SWITCH_BANK:
if (address == 0 && value < 2) {
_flashSwitchBank(savedata, value);
} else {
GBALog(0, GBA_LOG_GAME_ERROR, "Bad flash bank switch");
savedata->command = FLASH_COMMAND_NONE;
}
break;
default:
if (address == FLASH_BASE_HI && value == FLASH_COMMAND_START) {
savedata->flashState = FLASH_STATE_START;
} else {
GBALog(0, GBA_LOG_GAME_ERROR, "Bad flash write: %#04x = %#02x", address, value);
}
break;
}
break;
case FLASH_STATE_START:
if (address == FLASH_BASE_LO && value == FLASH_COMMAND_CONTINUE) {
savedata->flashState = FLASH_STATE_CONTINUE;
} else {
GBALog(0, GBA_LOG_GAME_ERROR, "Bad flash write: %#04x = %#02x", address, value);
savedata->flashState = FLASH_STATE_RAW;
}
break;
case FLASH_STATE_CONTINUE:
savedata->flashState = FLASH_STATE_RAW;
if (address == FLASH_BASE_HI) {
switch (savedata->command) {
case FLASH_COMMAND_NONE:
switch (value) {
case FLASH_COMMAND_ERASE:
case FLASH_COMMAND_ID:
case FLASH_COMMAND_PROGRAM:
case FLASH_COMMAND_SWITCH_BANK:
savedata->command = value;
break;
default:
GBALog(0, GBA_LOG_GAME_ERROR, "Unsupported flash operation: %#02x", value);
break;
}
break;
case FLASH_COMMAND_ERASE:
switch (value) {
case FLASH_COMMAND_ERASE_CHIP:
_flashErase(savedata);
break;
default:
GBALog(0, GBA_LOG_GAME_ERROR, "Unsupported flash erase operation: %#02x", value);
break;
}
savedata->command = FLASH_COMMAND_NONE;
break;
case FLASH_COMMAND_ID:
if (value == FLASH_COMMAND_TERMINATE) {
savedata->command = FLASH_COMMAND_NONE;
}
break;
default:
GBALog(0, GBA_LOG_ERROR, "Flash entered bad state: %#02x", savedata->command);
savedata->command = FLASH_COMMAND_NONE;
break;
}
} else if (savedata->command == FLASH_COMMAND_ERASE) {
if (value == FLASH_COMMAND_ERASE_SECTOR) {
_flashEraseSector(savedata, address);
savedata->command = FLASH_COMMAND_NONE;
} else {
GBALog(0, GBA_LOG_GAME_ERROR, "Unsupported flash erase operation: %#02x", value);
}
}
break;
}
}
void GBASavedataWriteEEPROM(struct GBASavedata* savedata, uint16_t value, uint32_t writeSize) {
@ -172,3 +270,26 @@ uint16_t GBASavedataReadEEPROM(struct GBASavedata* savedata) {
}
return 0;
}
void _flashSwitchBank(struct GBASavedata* savedata, int bank) {
savedata->currentBank = &savedata->data[bank << 16];
if (bank > 0) {
savedata->type = SAVEDATA_FLASH1M;
}
}
void _flashErase(struct GBASavedata* savedata) {
size_t size = 0x10000;
if (savedata->type == SAVEDATA_FLASH1M) {
size = 0x20000;
}
memset(savedata->data, 0xFF, size);
}
void _flashEraseSector(struct GBASavedata* savedata, uint16_t sectorStart) {
size_t size = 0x1000;
if (savedata->type == SAVEDATA_FLASH1M) {
GBALog(0, GBA_LOG_DEBUG, "Performing unknown sector-size erase at %#04x", sectorStart);
}
memset(&savedata->currentBank[sectorStart & ~(size - 1)], 0xFF, size);
}

38
src/gba/gba-savedata.h
View File

@ -16,11 +16,38 @@ enum SavedataCommand {
EEPROM_COMMAND_PENDING = 1,
EEPROM_COMMAND_WRITE = 2,
EEPROM_COMMAND_READ_PENDING = 3,
EEPROM_COMMAND_READ = 4
EEPROM_COMMAND_READ = 4,
FLASH_COMMAND_START = 0xAA,
FLASH_COMMAND_CONTINUE = 0x55,
FLASH_COMMAND_ERASE_CHIP = 0x10,
FLASH_COMMAND_ERASE_SECTOR = 0x30,
FLASH_COMMAND_NONE = 0,
FLASH_COMMAND_ERASE = 0x80,
FLASH_COMMAND_ID = 0x90,
FLASH_COMMAND_PROGRAM = 0xA0,
FLASH_COMMAND_SWITCH_BANK = 0xB0,
FLASH_COMMAND_TERMINATE = 0xF0
};
enum FlashStateMachine {
FLASH_STATE_RAW = 0,
FLASH_STATE_START,
FLASH_STATE_CONTINUE
};
enum FlashManufacturer {
FLASH_MFG_PANASONIC = 0x1B32,
FLASH_MFG_SANYO = 0x1362
};
enum {
SAVEDATA_FLASH_BASE = 0x0E005555
SAVEDATA_FLASH_BASE = 0x0E005555,
FLASH_BASE_HI = 0x5555,
FLASH_BASE_LO = 0x2AAA
};
struct GBASavedata {
@ -35,6 +62,10 @@ struct GBASavedata {
int writeAddress;
int writePending;
int addressBits;
uint8_t* currentBank;
enum FlashStateMachine flashState;
};
void GBASavedataInit(struct GBASavedata* savedata, const char* filename);
@ -44,7 +75,8 @@ void GBASavedataInitFlash(struct GBASavedata* savedata);
void GBASavedataInitEEPROM(struct GBASavedata* savedata);
void GBASavedataInitSRAM(struct GBASavedata* savedata);
void GBASavedataWriteFlash(struct GBASavedata* savedata, uint8_t value);
uint8_t GBASavedataReadFlash(struct GBASavedata* savedata, uint16_t address);
void GBASavedataWriteFlash(struct GBASavedata* savedata, uint16_t address, uint8_t value);
uint16_t GBASavedataReadEEPROM(struct GBASavedata* savedata);
void GBASavedataWriteEEPROM(struct GBASavedata* savedata, uint16_t value, uint32_t writeSize);

4
src/gba/gba.h
View File

@ -33,7 +33,9 @@ enum GBALogLevel {
GBA_LOG_DEBUG,
GBA_LOG_INFO,
GBA_LOG_WARN,
GBA_LOG_ERROR
GBA_LOG_ERROR,
GBA_LOG_GAME_ERROR
};
enum GBAKey {