GBA: Savestates now take into account savedata state machines (fixes #109)

CHANGES

@@ -75,6 +75,7 @@ Misc:
  - All: Enable link-time optimization
  - GBA Thread: Make GBASyncWaitFrameStart time out
  - GBA: Move A/V stream interface into core
+ - GBA: Savestates now take into account savedata state machines (fixes #109)
 
 0.1.1: (2015-01-24)
 Bugfixes:

src/gba/savedata.c

@@ -6,6 +6,7 @@
 #include "savedata.h"
 
 #include "gba/gba.h"
+#include "gba/serialize.h"
 
 #include "util/memory.h"
 #include "util/vfs.h"
@@ -375,6 +376,37 @@ uint16_t GBASavedataReadEEPROM(struct GBASavedata* savedata) {
 	return 0;
 }
 
+void GBASavedataSerialize(const struct GBASavedata* savedata, struct GBASerializedState* state, bool includeData) {
+	state->savedata.type = savedata->type;
+	state->savedata.command = savedata->command;
+	state->savedata.flashState = savedata->flashState;
+	state->savedata.flashBank = savedata->currentBank == &savedata->data[0x10000];
+	state->savedata.readBitsRemaining = savedata->readBitsRemaining;
+	state->savedata.readAddress = savedata->readAddress;
+	state->savedata.writeAddress = savedata->writeAddress;
+
+	UNUSED(includeData); // TODO
+}
+
+void GBASavedataDeserialize(struct GBASavedata* savedata, const struct GBASerializedState* state, bool includeData) {
+	if (state->savedata.type == SAVEDATA_FORCE_NONE) {
+		return;
+	}
+	if (savedata->type != state->savedata.type) {
+		GBASavedataForceType(savedata, state->savedata.type);
+	}
+	savedata->command = state->savedata.command;
+	savedata->flashState = state->savedata.flashState;
+	savedata->readBitsRemaining = state->savedata.readBitsRemaining;
+	savedata->readAddress = state->savedata.readAddress;
+	savedata->writeAddress = state->savedata.writeAddress;
+	if (savedata->type == SAVEDATA_FLASH1M) {
+		_flashSwitchBank(savedata, state->savedata.flashBank);
+	}
+
+	UNUSED(includeData); // TODO
+}
+
 void _flashSwitchBank(struct GBASavedata* savedata, int bank) {
 	GBALog(0, GBA_LOG_DEBUG, "Performing flash bank switch to bank %i", bank);
 	savedata->currentBank = &savedata->data[bank << 16];

src/gba/savedata.h

@@ -13,10 +13,10 @@ struct VFile;
 enum SavedataType {
 	SAVEDATA_AUTODETECT = -1,
 	SAVEDATA_FORCE_NONE = 0,
-	SAVEDATA_SRAM,
-	SAVEDATA_FLASH512,
-	SAVEDATA_FLASH1M,
-	SAVEDATA_EEPROM
+	SAVEDATA_SRAM = 1,
+	SAVEDATA_FLASH512 = 2,
+	SAVEDATA_FLASH1M = 3,
+	SAVEDATA_EEPROM = 4
 };
 
 enum SavedataCommand {
@@ -42,8 +42,8 @@ enum SavedataCommand {
 
 enum FlashStateMachine {
 	FLASH_STATE_RAW = 0,
-	FLASH_STATE_START,
-	FLASH_STATE_CONTINUE
+	FLASH_STATE_START = 1,
+	FLASH_STATE_CONTINUE = 2,
 };
 
 enum FlashManufacturer {
@@ -67,9 +67,9 @@ struct GBASavedata {
 	int mapMode;
 	struct VFile* realVf;
 
-	int readBitsRemaining;
-	int readAddress;
-	int writeAddress;
+	int32_t readBitsRemaining;
+	uint32_t readAddress;
+	uint32_t writeAddress;
 
 	uint8_t* currentBank;
 
@@ -94,4 +94,8 @@ void GBASavedataWriteFlash(struct GBASavedata* savedata, uint16_t address, uint8
 uint16_t GBASavedataReadEEPROM(struct GBASavedata* savedata);
 void GBASavedataWriteEEPROM(struct GBASavedata* savedata, uint16_t value, uint32_t writeSize);
 
+struct GBASerializedState;
+void GBASavedataSerialize(const struct GBASavedata* savedata, struct GBASerializedState* state, bool includeData);
+void GBASavedataDeserialize(struct GBASavedata* savedata, const struct GBASerializedState* state, bool includeData);
+
 #endif

src/gba/serialize.c

@@ -48,6 +48,7 @@ void GBASerialize(struct GBA* gba, struct GBASerializedState* state) {
 	GBAIOSerialize(gba, state);
 	GBAVideoSerialize(&gba->video, state);
 	GBAAudioSerialize(&gba->audio, state);
+	GBASavedataSerialize(&gba->memory.savedata, state, false);
 
 	state->associatedStreamId = 0;
 	if (gba->rr) {
@@ -111,6 +112,7 @@ void GBADeserialize(struct GBA* gba, const struct GBASerializedState* state) {
 	GBAIODeserialize(gba, state);
 	GBAVideoDeserialize(&gba->video, state);
 	GBAAudioDeserialize(&gba->audio, state);
+	GBASavedataDeserialize(&gba->memory.savedata, state, false);
 
 	if (gba->rr) {
 		gba->rr->stateLoaded(gba->rr, state);

src/gba/serialize.h

@@ -129,7 +129,7 @@ extern const uint32_t GBA_SAVESTATE_MAGIC;
  * 0x00290 - 0x002C3: GPIO state
  * | 0x00290 - 0x00291: Pin state
  * | 0x00292 - 0x00293: Direction state
- * | 0x00294 - 0x002B6: RTC state (see gba-hardware.h for format)
+ * | 0x00294 - 0x002B6: RTC state (see hardware.h for format)
  * | 0x002B7 - 0x002B7: GPIO devices
  *   | bit 0: Has RTC values
  *   | bit 1: Has rumble value (reserved)
@@ -150,7 +150,20 @@ extern const uint32_t GBA_SAVESTATE_MAGIC;
  * | 0x002C1 - 0x002C3: Flags
  *   | bits 0 - 1: Tilt state machine
  *   | bits 2 - 31: Reserved
- * 0x002C4 - 0x002F3: Reserved (leave zero)
+ * 0x002C4 - 0x002DF: Reserved (leave zero)
+ * 0x002E0 - 0x002EF: Savedata state
+ * | 0x002E0 - 0x002E0: Savedata type
+ * | 0x002E1 - 0x002E1: Savedata command (see savedata.h)
+ * | 0x002E2 - 0x002E2: Flags
+ *   | bits 0 - 1: Flash state machine
+ *   | bits 2 - 3: Reserved
+ *   | bit 4: Flash bank
+ *   | bits 5 - 7: Reserved
+ * | 0x002E3 - 0x002E3: Reserved
+ * | 0x002E4 - 0x002E7: EEPROM read bits remaining
+ * | 0x002E8 - 0x002EB: EEPROM read address
+ * | 0x002EC - 0x002EBF EEPROM write address
+ * 0x002F0 - 0x002F3: Reserved (leave zero)
  * 0x002F4 - 0x002FF: Prefetch
  * | 0x002F4 - 0x002F7: GBA BIOS bus prefetch
  * | 0x002F8 - 0x002FB: CPU prefecth (decode slot)
@@ -271,7 +284,22 @@ struct GBASerializedState {
 		unsigned : 22;
 	} hw;
 
-	uint32_t reservedHardware[12];
+	uint32_t reservedHardware[7];
+
+	struct {
+		unsigned type : 8;
+		unsigned command : 8;
+		unsigned flashState : 2;
+		unsigned : 2;
+		unsigned flashBank : 1;
+		unsigned : 3;
+		unsigned : 8;
+		int32_t readBitsRemaining;
+		uint32_t readAddress;
+		uint32_t writeAddress;
+	} savedata;
+
+	uint32_t reservedPadding;
 
 	uint32_t biosPrefetch;
 	uint32_t cpuPrefetch[2];