boot_loader.cpp

浙江大学的悟空嵌入式系统模拟器

/**
 *  Copyright (c) 2005 Zhejiang University, P.R.China
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */ 

///==================================================
/**
 * @file        Boot_loader.cpp
 * @brief      
 * @author      Chenfeng Zhou <[e-mail]> 
 *
 * Created    : <2005-04-06 14:59:00 by Cheney Chow>
 * Last update: <2005-04-06 15:01:34 by Cheney Chow>
 *
 * $Id: Boot_loader.cpp,v 1.1 2005/06/16 06:01:43 qilj Exp $
 */
///==================================================

#include <cstdio>
#include "Boot_loader.h"
#include "Utils/Debug.h"

#include "Core/Global.h"
#include "Core/Processor.h"

namespace PPC
{

    int Boot_Loader::load_kernel (const std::string &kernel_file)
    {
        std::vector<Core::u8> buffer;
		int kernel_size;

		if ( (kernel_size = load_file(kernel_file, buffer)) < 0)
			PPC_ERROR_FAIL(("Load kernel file fail!\n"));
		
		Core::MMU<Core::u32>& mmu = ((Core::CPU<Core::u32>*)(Core::Wukong_Get_System().get_cpu()))->get_mmu();

		if (mmu.access(Core::Memory<Core::u32>::MEMORY_WRITE, KERNEL_LOAD_ADDR, kernel_size, buffer) < 0)
			PPC_ERROR_FAIL(("Load kernel to mem fail!\n"));

		return 0;
    }

	int Boot_Loader::load_file (const std::string &file, std::vector<Core::u8> &buffer)
	{
		int file_size;
		FILE *fp;

		if ( (fp = fopen(file.c_str(), "rb")) == NULL )
			return -1;

		if ( fseek(fp, 0, SEEK_END) < 0 )
			return -1;

		file_size = ftell(fp);
		
		buffer.resize(file_size);

		fseek(fp, 0, SEEK_SET);

		if	(fread(&buffer[0], file_size, 1, fp) == 0 && !feof(fp)) {
			fclose(fp);
			return -1;
		}

		fclose(fp);
		return file_size;
	}
}