A src/gba/gba-serialize.c

@@ -0,0 +1,142 @@
+#include "gba-serialize.h"
+
+/* Savestate format:
+ * 0x00000 - 0x00003: Version Magic (0x01000000)
+ * 0x00004 - 0x00007: BIOS checksum (e.g. 0xBAAE187F for official BIOS)
+ * 0x00008 - 0x0000F: Reserved (leave zero)
+ * 0x00010 - 0x0001B: Game title (e.g. METROID4USA)
+ * 0x0001C - 0x0001F: Game code (e.g. AMTE)
+ * 0x00020 - 0x0012F: CPU state:
+ * | 0x00020 - 0x0005F: GPRs
+ * | 0x00060 - 0x00063: CPSR
+ * | 0x00064 - 0x00067: SPSR
+ * | 0x00068 - 0x0006B: Cycles since last event
+ * | 0x0006C - 0x0006F: Cycles until next event
+ * | 0x00070 - 0x00117: Banked registers
+ * | 0x00118 - 0x0012F: Banked SPSRs
+ * 0x00130 - 0x00147: Audio channel 1 state
+ * | 0x00130 - 0x00130: Current volume
+ * | 0x00131 - 0x00131: Is channel dead?
+ * | 0x00132 - 0x00132: Is channel high?
+ * | 0x00133 - 0x00133: Reserved
+ * | 0x00134 - 0x00137: Next envelope step
+ * | 0x00137 - 0x0013B: Next square wave step
+ * | 0x0013C - 0x0013G: Next sweep step
+ * | 0x00140 - 0x00143: Channel end cycle
+ * | 0x00144 - 0x00147: Next event
+ * 0x00148 - 0x0015F: Audio channel 2/4 state
+ * | 0x00148 - 0x00148: Current volume
+ * | 0x00149 - 0x00149: Is channel dead?
+ * | 0x0014A - 0x0014A: Is channel high?
+ * | 0x0014B - 0x0014B: Reserved
+ * | 0x0014C - 0x0014F: Next envelope step
+ * | 0x00150 - 0x00153: Next square wave step
+ * | 0x00154 - 0x00157: Audio channel 4 LFSR
+ * | 0x00158 - 0x0015B: Channel end cycle
+ * | 0x0015C - 0x0015F: Next Event
+ * 0x00160 - 0x0017F: Audio channel 3 wave banks
+ * 0x00180 - 0x0019F: Audio FIFO 1
+ * 0x001A0 - 0x001BF: Audio FIFO 2
+ * 0x001C0 - 0x001DF: Audio miscellaneous state
+ * | 0x001C0 - 0x001C3: Next event
+ * | 0x001C4 - 0x001C7: Event diff
+ * | 0x001C8 - 0x001CB: Next channel 3 event
+ * | 0x001CC - 0x001CF: Next channel 4 event
+ * | 0x001D0 - 0x001D3: Next sample
+ * | 0x001D4 - 0x001D7: FIFO size
+ * | 0x001D8 - 0x001DF: Reserved
+ * 0x001E0 - 0x001FF: Video miscellaneous state
+ * | 0x001E0 - 0x001E3: Next event
+ * | 0x001E4 - 0x001E7: Event diff
+ * | 0x001E8 - 0x001EB: Last hblank
+ * | 0x001EC - 0x001EF: Next hblank
+ * | 0x001F0 - 0x001F3: Next hblank IRQ
+ * | 0x001F4 - 0x001F7: Next vblank IRQ
+ * | 0x001F8 - 0x001FB: Next vcounter IRQ
+ * | 0x001FC - 0x001FF: Reserved
+ * 0x00200 - 0x003FF: Reserved (leave zero)
+ * 0x00400 - 0x007FF: I/O memory
+ * 0x00800 - 0x00BFF: Palette
+ * 0x00C00 - 0x00FFF: OAM
+ * 0x01000 - 0x18FFF: VRAM
+ * 0x19000 - 0x20FFF: IWRAM
+ * 0x21000 - 0x60FFF: WRAM
+ * Total size: 0x61000 (397,312) bytes
+ */
+
+struct GBASerializedState {
+	uint32_t versionMagic;
+	uint32_t biosChecksum;
+	uint32_t reservedHeader[2];
+
+	char title[12];
+	uint32_t id;
+
+	struct {
+		int32_t gprs[16];
+		union PSR cpsr;
+		union PSR spsr;
+
+		int32_t cycles;
+		int32_t nextEvent;
+
+		int32_t bankedRegisters[6][7];
+		int32_t bankedSPSRs[6];
+	} cpu;
+
+	struct {
+		struct {
+	 		int8_t volume;
+	 		int8_t dead;
+	 		int8_t hi;
+	 		int8_t : 8;
+	 		int32_t envelopeNextStep;
+	 		int32_t waveNextStep;
+	 		int32_t sweepNextStep;
+	 		int32_t endTime;
+	 		int32_t nextEvent;
+	 	} ch1;
+		struct {
+	 		int8_t volume;
+	 		int8_t dead;
+	 		int8_t hi;
+	 		int8_t : 8;
+	 		int32_t envelopeNextStep;
+	 		int32_t waveNextStep;
+	 		int32_t ch4Lfsr;
+	 		int32_t endTime;
+	 		int32_t nextEvent;
+	 	} ch2;
+	 	uint32_t ch3[8];
+	 	uint32_t fifoA[8];
+	 	uint32_t fifoB[8];
+	 	int32_t nextEvent;
+		int32_t eventDiff;
+	 	int32_t nextCh3;
+	 	int32_t nextCh4;
+	 	int32_t nextSample;
+	 	int32_t fifoSize;
+	 	int32_t : 32;
+	 	int32_t : 32;
+	} audio;
+
+	struct {
+		int32_t nextEvent;
+		int32_t eventDiff;
+		int32_t lastHblank;
+		int32_t nextHblank;
+		int32_t nextHblankIRQ;
+		int32_t nextVblankIRQ;
+		int32_t nextVcounterIRQ;
+		int32_t : 32;
+	} video;
+
+	uint32_t reservedGpio[128];
+
+	uint16_t io[SIZE_IO >> 1];
+	uint16_t pram[SIZE_PALETTE_RAM >> 1];
+	uint16_t oam[SIZE_PALETTE_RAM >> 1];
+	uint16_t vram[SIZE_PALETTE_RAM >> 1];
+	uint8_t iwram[SIZE_WORKING_IRAM];
+	uint8_t wram[SIZE_WORKING_RAM];
+};

A src/gba/gba-serialize.h

@@ -0,0 +1,6 @@
+#include "gba.h"
+
+struct GBASerializedState;
+
+void GBASerialize(struct GBA* gba, struct GBASerializedState* state);
+void GBADeserialize(struct GBA* gba, struct GBASerializedState* state);