B main ; 0x080000D0

#define USER_INTERRUPT_HANDLE (void*)0x03005B00
#define WRAM_USER_INTERRUPT *(u32*)(0x03007FFC)
#define GAME_PAK_WAITCNT *(u32)(0x04000204)
#define USERHANDLE_DISPATCHER (void*)(0x081D6000)
#define DISPSTAT *(u32*)(0x04000004)
#define KEYCNT *(u32*)(0x04000132)

int main() {
	asm (
	"r0, #0x12\n\t"        
	"msr cpsr_cf, r0\n\t"   // IRQ Mode
	"ldr sp, =IRQStack\n\t" // Inicializa a Stack do IRQMode, 0x03007F60
	"r0, #0x13\n\t"          
	"msr cpsr_cf, r0\n\t"   // SVC Mode
	"ldr sp, =SVCStack\n\t" // Inicializa a Stack do SVCMode, 0x03007FE0
	"r0, #0x1F\n\t"          
	"msr cpsr_cf, r0\n\t"   // Sys Mode
	"ldr sp, =SysStack"     // Inicializa a Stack do SysMode, 0x03007E00
	);
	// Salva um ponteiro para o user Interrupt Handle ?
	WRAM_USER_INTERRUPT = USER_INTERRUPT_HANDLE; 
	// Inicializa o GamePak WAITCNT com os bits
	GAME_PAK_WAITCNT = 0x45B4;
	// Limpa Fast WRAM
	memset_zero(0x3000000, 0x7E00);
	// Limpa Slow WRAM
	memset_zero(0x2000000, 0x40000);
	// Limpa VRAM
	memset_zero(0x6000000, 0x18000);
	// Limpa OAM
	memset_zero(0x7000000, 0x400);
	// Limpa Palette
	memset_zero(0x5000000, 0x400);

	// Copia o UserHandle_Dispatcher para a WRAM
	SetupUserHandle(USERHANDLE_DISPATCHER, USER_INTERRUPT_HANDLE, 0x1ED4);
	// ?
	CallCpuSet_Copy();
	// ?
	psRandom_And_Copy_Data();
	// ?
	BiosInterrupt_funcptr();

	// Inicializa algumas variaveis
	// wram_var_unk e as outras duas tem algo relacionado com hblank
	// wram_var_unk
	*(u32*)(0x020081B0) = 0;
	// hblank_r_2
	*(u32*)(0x02009930) = 1;
	// hblank_r_1
	*(u32*)(0x0200A870) = 0;
	// Inicializa DisplayStatus com VBLANK 
	DISPSTAT = 8;
	// Inicializa Key Interrupt, todos os botões e logica AND ?
	KEYCNT = 0x83FF;
	// Mais inicilizações e main game loop
	init_main_game_loop(); // 0x080002BC
}	

void CpuFastSet_FillMode(void* dst, u32 flag_mode) {
	u32 fill_mode = 0x1000000;
	fill_mode = (flag_mode >> 0x2) | fill_mode;
	SWI_CpuFastSet(0x0, dst, fill_mode);	
}

void clearVRAM() {
	CpuFastSet_FillMode(0x06000000, 0x40);
	CpuFastSet_FillMode(0x6004000,  0x40);
	CpuFastSet_FillMode(0x6008000,  0x40);
	CpuFastSet_FillMode(0x600C000,  0x20);
}

void memcpy(void *src, void *dst, size_t size) {
	while (size) {
		dst[size] = src[size];
		size--;
	}
}

void memset_8_0(void *dst, size_t size) {
	while (size) {
		*(u8*)(dst + size) = 0;
		size--;
	}
}

void memset_zero(void *dst, size_t size) {
	while (size) {
		dst[size] = 0;
		size--;
	}
}

 void SetupIRQHandle(void *src, void *dst, size_t size) {
	while (size) {
		dst[size] = src[size];
		size--;
	}
}