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/*
* kexec: Linux boots Linux
*
* Created by: Vivek goyal (vgoyal@in.ibm.com)
* Copyright (C) IBM Corporation, 2005. All rights reserved
*
* 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 (version 2 of the License).
*
* 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.
*/
#include <stdint.h>
#include <string.h>
/* Backup region start gets set after /proc/iomem has been parsed. */
/* We reuse the same code for x86_64 also so changing backup_start to
unsigned long */
unsigned long backup_start = 0;
unsigned long backup_src_start = 0;
unsigned long backup_src_size = 0;
/* Backup first 640K of memory to backup region as reserved by kexec.
* Assuming first 640K has to be present on i386 machines and no address
* validity checks have to be performed. */
void crashdump_backup_memory(void)
{
void *dest, *src;
size_t size;
src = (void *) backup_src_start;
size = (size_t) backup_src_size;
if (!size)
return;
if (backup_start) {
dest = (void *)(backup_start);
memcpy(dest, src, size);
}
}
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