Add RTC last latch to savestates

Author: CasualPokePlayer

include/mgba/internal/gba/serialize.h

@@ -256,7 +256,8 @@ mLOG_DECLARE_CATEGORY(GBA_STATE);
  * 0x00380 - 0x0038F: Audio FIFO B samples
  * 0x00390 - 0x003CF: Audio rendered samples
  * 0x003D0 - 0x003D3: Memory bus value
- * 0x003D4 - 0x003FF: Reserved (leave zero)
+ * 0x003D4 - 0x003DB: RTC last latch
+ * 0x003DC - 0x003FF: Reserved (leave zero)
  * 0x00400 - 0x007FF: I/O memory
  * 0x00800 - 0x00BFF: Palette
  * 0x00C00 - 0x00FFF: OAM
@@ -468,7 +469,9 @@ struct GBASerializedState {
 
 	uint32_t bus;
 
-	uint32_t reserved[11];
+	int64_t rtcLastLatch;
+
+	uint32_t reserved[9];
 
 	uint16_t io[GBA_SIZE_IO >> 1];
 	uint16_t pram[GBA_SIZE_PALETTE_RAM >> 1];

src/gba/cart/gpio.c

@@ -784,6 +784,7 @@ void GBAHardwareSerialize(const struct GBACartridgeHardware* hw, struct GBASeria
 	STORE_32(hw->rtc.command, 0, &state->hw.rtcCommand);
 	STORE_32(hw->rtc.control, 0, &state->hw.rtcControl);
 	memcpy(state->hw.time, hw->rtc.time, sizeof(state->hw.time));
+	STORE_64((int64_t)hw->rtc.lastLatch, 0, &state->rtcLastLatch);
 
 	STORE_16(hw->gyroSample, 0, &state->hw.gyroSample);
 	flags1 = GBASerializedHWFlags1SetGyroEdge(flags1, hw->gyroEdge);
@@ -835,6 +836,7 @@ void GBAHardwareDeserialize(struct GBACartridgeHardware* hw, const struct GBASer
 	LOAD_32(hw->rtc.command, 0, &state->hw.rtcCommand);
 	LOAD_32(hw->rtc.control, 0, &state->hw.rtcControl);
 	memcpy(hw->rtc.time, state->hw.time, sizeof(hw->rtc.time));
+	LOAD_64(hw->rtc.lastLatch, 0, &state->rtcLastLatch);
 	GBAHardwareRTCSanitize(hw);
 
 	LOAD_16(hw->gyroSample, 0, &state->hw.gyroSample);