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crash_dump.c

/*
 * arch/arm/kernel/crash_dump.c
 *
 * Copyright (C) 2010 Nokia Corporation.
 * Author: Mika Westerberg
 *
 * This code is taken from arch/x86/kernel/crash_dump_64.c
 *   Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
 *   Copyright (C) IBM Corporation, 2004. 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 version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/errno.h>
#include <linux/crash_dump.h>
#include <linux/uaccess.h>
#include <linux/io.h>

/* stores the physical address of elf header of crash image */
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;

/**
 * copy_oldmem_page() - copy one page from old kernel memory
 * @pfn: page frame number to be copied
 * @buf: buffer where the copied page is placed
 * @csize: number of bytes to copy
 * @offset: offset in bytes into the page
 * @userbuf: if set, @buf is int he user address space
 *
 * This function copies one page from old kernel memory into buffer pointed by
 * @buf. If @buf is in userspace, set @userbuf to %1. Returns number of bytes
 * copied or negative error in case of failure.
 */
ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
                   size_t csize, unsigned long offset,
                   int userbuf)
{
      void *vaddr;

      if (!csize)
            return 0;

      vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
      if (!vaddr)
            return -ENOMEM;

      if (userbuf) {
            if (copy_to_user(buf, vaddr + offset, csize)) {
                  iounmap(vaddr);
                  return -EFAULT;
            }
      } else {
            memcpy(buf, vaddr + offset, csize);
      }

      iounmap(vaddr);
      return csize;
}

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