boot_loader.h

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.h
 *
 * @brief       Load compressed kernel image
 *
 *              In our real life, there's no elf-loader for
 *              `naked' machine during booting, so we have to 
 *              load self-decompressed kernel(zip format)
 *
 * @author      Chenfeng Zhou <[e-mail]> 
 *
 * Created    : <2005-04-06 14:53:14 by Cheney Chow>
 * Last update: <2005-04-06 15:00:19 by Cheney Chow>
 *
 * $Id: Boot_loader.h,v 1.1 2005/06/16 06:01:43 qilj Exp $
 */
///==================================================

#ifndef _BOOT_LOADER_H_
#define _BOOT_LOADER_H_

#include "Core/System.h"
#include "PPC.h"

namespace PPC
{
    class PPC_API Boot_Loader
    {
		//! zImage loaded at 8M-32bytes;
		
		//! There's 32 bytes `rubbish' at the beginning of the image 
		//! followed by the real executable binary instructions;
		static const int KERNEL_LOAD_ADDR = 0x7FFFE0;

    public:
		//! Load kernel at KERNEL_LOAD_ADDR;

		//! Actually, the compressed kernel can be loaded at any address
		//! of the physical address. The `relocate' function in Linux kernel
		//! can relocate kernel itself to the link address(8M);
        static int load_kernel (const std::string&);

	private:
		//! Success: return the file size;
		//! Fail: return -1;
		static int load_file (const std::string &file, std::vector<Core::u8> &buffer);
    };
}

#endif  // _BOOT_LOADER_H_