1#include <linux/kernel.h>
 2#include <linux/crash_dump.h>
 3#include <linux/init.h>
 4#include <linux/errno.h>
 5#include <linux/export.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 * stores the size of elf header of crash image
24 */
25unsigned long long elfcorehdr_size;
26
27/*
28 * elfcorehdr= specifies the location of elf core header stored by the crashed
29 * kernel. This option will be passed by kexec loader to the capture kernel.
30 *
31 * Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
32 */
33static int __init setup_elfcorehdr(char *arg)
34{
35	char *end;
36	if (!arg)
37		return -EINVAL;
38	elfcorehdr_addr = memparse(arg, &end);
39	if (*end == '@') {
40		elfcorehdr_size = elfcorehdr_addr;
41		elfcorehdr_addr = memparse(end + 1, &end);
42	}
43	return end > arg ? 0 : -EINVAL;
44}
45early_param("elfcorehdr", setup_elfcorehdr);

 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);