diff --git a/src/arm.c b/src/arm.c
index b78381ac4..91b29026d 100644
--- a/src/arm.c
+++ b/src/arm.c
@@ -4,17 +4,16 @@
 #define ARM_ROR(I, ROTATE) (((I) >> ROTATE) | (I << (32 - ROTATE)))
 
 static inline void _ARMSetMode(struct ARMCore*, enum ExecutionMode);
-static void _ARMSetPrivilegeMode(struct ARMCore*, enum PrivilegeMode);
 static ARMInstruction _ARMLoadInstructionARM(struct ARMMemory*, uint32_t address, uint32_t* opcodeOut);
 static ARMInstruction _ARMLoadInstructionThumb(struct ARMMemory*, uint32_t address, uint32_t* opcodeOut);
 static inline enum RegisterBank _ARMSelectBank(enum PrivilegeMode);
 
 static inline void _ARMReadCPSR(struct ARMCore* cpu) {
 	_ARMSetMode(cpu, cpu->cpsr.t);
-	_ARMSetPrivilegeMode(cpu, cpu->cpsr.priv);
+	ARMSetPrivilegeMode(cpu, cpu->cpsr.priv);
 }
 
-static void _ARMSetPrivilegeMode(struct ARMCore* cpu, enum PrivilegeMode mode) {
+void ARMSetPrivilegeMode(struct ARMCore* cpu, enum PrivilegeMode mode) {
 	if (mode == cpu->privilegeMode) {
 		// Not switching modes after all
 		return;
@@ -127,6 +126,20 @@ static ARMInstruction _ARMLoadInstructionThumb(struct ARMMemory* memory, uint32_
 }
 
 void ARMInit(struct ARMCore* cpu) {
+	cpu->memory = 0;
+	cpu->board = 0;
+}
+
+void ARMAssociateMemory(struct ARMCore* cpu, struct ARMMemory* memory) {
+	cpu->memory = memory;
+}
+
+void ARMAssociateBoard(struct ARMCore* cpu, struct ARMBoard* board) {
+	cpu->board = board;
+	board->cpu = cpu;
+}
+
+void ARMReset(struct ARMCore* cpu) {
 	int i;
 	for (i = 0; i < 16; ++i) {
 		cpu->gprs[i] = 0;
@@ -150,15 +163,10 @@ void ARMInit(struct ARMCore* cpu) {
 	cpu->shifterOperand = 0;
 	cpu->shifterCarryOut = 0;
 
-	cpu->memory = 0;
-	cpu->board = 0;
-
 	cpu->executionMode = MODE_THUMB;
 	_ARMSetMode(cpu, MODE_ARM);
-}
 
-void ARMAssociateMemory(struct ARMCore* cpu, struct ARMMemory* memory) {
-	cpu->memory = memory;
+	cpu->board->reset(cpu->board);
 }
 
 void ARMStep(struct ARMCore* cpu) {
diff --git a/src/arm.h b/src/arm.h
index 031a497bc..8916c8306 100644
--- a/src/arm.h
+++ b/src/arm.h
@@ -80,7 +80,8 @@ struct ARMMemory {
 };
 
 struct ARMBoard {
-	// TODO
+	struct ARMCore* cpu;
+	void (*reset)(struct ARMBoard* board);
 };
 
 struct ARMCore {
@@ -108,7 +109,10 @@ struct ARMCore {
 
 void ARMInit(struct ARMCore* cpu);
 void ARMAssociateMemory(struct ARMCore* cpu, struct ARMMemory* memory);
+void ARMAssociateBoard(struct ARMCore* cpu, struct ARMBoard* board);
 
+void ARMReset(struct ARMCore* cpu);
 void ARMStep(struct ARMCore* cpu);
+void ARMSetPrivilegeMode(struct ARMCore*, enum PrivilegeMode);
 
 #endif
diff --git a/src/gba.c b/src/gba.c
index fc42574c0..be010a7ed 100644
--- a/src/gba.c
+++ b/src/gba.c
@@ -14,6 +14,11 @@ void GBAInit(struct GBA* gba) {
 	gba->memory.p = gba;
 	GBAMemoryInit(&gba->memory);
 	ARMAssociateMemory(&gba->cpu, &gba->memory.d);
+
+	GBABoardInit(&gba->board);
+	ARMAssociateBoard(&gba->cpu, &gba->board.d);
+
+	ARMReset(&gba->cpu);
 }
 
 void GBADeinit(struct GBA* gba) {
@@ -47,6 +52,20 @@ void GBAMemoryDeinit(struct GBAMemory* memory) {
 	munmap(memory->iwram, SIZE_WORKING_IRAM);
 }
 
+void GBABoardInit(struct GBABoard* board) {
+	board->d.reset = GBABoardReset;
+}
+
+void GBABoardReset(struct ARMBoard* board) {
+	struct ARMCore* cpu = board->cpu;
+	ARMSetPrivilegeMode(cpu, MODE_IRQ);
+	cpu->gprs[ARM_SP] = SP_BASE_IRQ;
+	ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
+	cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
+	ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
+	cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
+}
+
 void GBALoadROM(struct GBA* gba, int fd) {
 	gba->memory.rom = mmap(0, SIZE_CART0, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FILE, fd, 0);
 	// TODO: error check
diff --git a/src/gba.h b/src/gba.h
index 0f8cc9830..77700c634 100644
--- a/src/gba.h
+++ b/src/gba.h
@@ -41,6 +41,7 @@ enum GBAMemoryBase {
 	BASE_CART2_EX = 0x0D000000,
 	BASE_CART_SRAM = 0x0E000000
 };
+
 enum {
 	SIZE_BIOS = 0x00004000,
 	SIZE_WORKING_RAM = 0x00040000,
@@ -58,6 +59,12 @@ enum {
 	SIZE_CART_EEPROM = 0x00002000
 };
 
+enum {
+	SP_BASE_SYSTEM = 0x03FFFF00,
+	SP_BASE_IRQ = 0x03FFFFA0,
+	SP_BASE_SUPERVISOR = 0x03FFFFE0
+};
+
 enum {
 	OFFSET_MASK = 0x00FFFFFF
 };
@@ -73,7 +80,7 @@ struct GBAMemory {
 };
 
 struct GBABoard {
-	struct ARMBoard board;
+	struct ARMBoard d;
 };
 
 struct GBA {
@@ -91,6 +98,9 @@ void GBADeinit(struct GBA* gba);
 void GBAMemoryInit(struct GBAMemory* memory);
 void GBAMemoryDeinit(struct GBAMemory* memory);
 
+void GBABoardInit(struct GBABoard* board);
+void GBABoardReset(struct ARMBoard* board);
+
 void GBALoadROM(struct GBA* gba, int fd);
 
 int32_t GBALoad32(struct ARMMemory* memory, uint32_t address);