linux/kernel/crash_dump.c
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   1#include <linux/kernel.h>
   2#include <linux/crash_dump.h>
   3#include <linux/init.h>
   4#include <linux/errno.h>
   5#include <linux/module.h>
   6
   7/*
   8 * If we have booted due to a crash, max_pfn will be a very low value. We need
   9 * to know the amount of memory that the previous kernel used.
  10 */
  11unsigned long saved_max_pfn;
  12
  13/*
  14 * stores the physical address of elf header of crash image
  15 *
  16 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
  17 * is_kdump_kernel() to determine if we are booting after a panic. Hence put
  18 * it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
  19 */
  20unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
  21
  22/*
  23 * elfcorehdr= specifies the location of elf core header stored by the crashed
  24 * kernel. This option will be passed by kexec loader to the capture kernel.
  25 */
  26static int __init setup_elfcorehdr(char *arg)
  27{
  28        char *end;
  29        if (!arg)
  30                return -EINVAL;
  31        elfcorehdr_addr = memparse(arg, &end);
  32        return end > arg ? 0 : -EINVAL;
  33}
  34early_param("elfcorehdr", setup_elfcorehdr);
  35
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