/*
    NitroHax -- Cheat tool for the Nintendo DS
    Copyright (C) 2008  Michael "Chishm" Chisholm

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <string.h>
#include <nds.h>

#include "load_bin.h"
#include "launch_engine.h"

#define LCDC_BANK_C (u16*)0x06840000

void vramcpy (void* dst, const void* src, int len)
{
	u16* dst16 = (u16*)dst;
	u16* src16 = (u16*)src;
	
	for ( ; len > 0; len -= 2) {
		*dst16++ = *src16++;
	}
}	

// Basic engine with no cheat related code.
void runLaunchEngine (bool UseNTRSplash, bool EnableSD)
{

	irqDisable(IRQ_ALL);

	// Direct CPU access to VRAM bank C
	VRAM_C_CR = VRAM_ENABLE | VRAM_C_LCD;

	// Clear VRAM
	memset (LCDC_BANK_C, 0x00, 128 * 1024);

	// Load the loader/patcher into the correct address
	vramcpy (LCDC_BANK_C, load_bin, load_bin_size);

	// Give the VRAM to the ARM7
	VRAM_C_CR = VRAM_ENABLE | VRAM_C_ARM7_0x06000000;

	// volatile u32* SCFG_EXT = (volatile u32*)0x4004008;
	
	if( UseNTRSplash ) {
		if( EnableSD ) {
			REG_SCFG_EXT=0x83000000;
		} else {
			REG_SCFG_EXT=0x03000000;
		}
	} else {
		if( EnableSD ) {
			REG_SCFG_EXT=0x83002000;
		} else {
			REG_SCFG_EXT=0x03002000;
		}
	}
	
	// REG_SCFG_EXT=0x03000000;
	// REG_SCFG_EXT=0x030F0100;

	// Reset into a passme loop
	REG_EXMEMCNT |= ARM7_OWNS_ROM | ARM7_OWNS_CARD;
	*((vu32*)0x027FFFFC) = 0;
	*((vu32*)0x027FFE04) = (u32)0xE59FF018;
	*((vu32*)0x027FFE24) = (u32)0x027FFE04;
	swiSoftReset(); 
}