Root/kernel/crash_dump.c

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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