[linux.git] / kernel / crash_dump.c

#include <linux/kernel.h>
#include <linux/crash_dump.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/export.h>

/*
 * If we have booted due to a crash, max_pfn will be a very low value. We need
 * to know the amount of memory that the previous kernel used.
 */
unsigned long saved_max_pfn;

/*
 * stores the physical address of elf header of crash image
 *
 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 * is_kdump_kernel() to determine if we are booting after a panic. Hence put
 * it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 */
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;

/*
 * stores the size of elf header of crash image
 */
unsigned long long elfcorehdr_size;

/*
 * elfcorehdr= specifies the location of elf core header stored by the crashed
 * kernel. This option will be passed by kexec loader to the capture kernel.
 *
 * Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
 */
static int __init setup_elfcorehdr(char *arg)
{
	char *end;
	if (!arg)
		return -EINVAL;
	elfcorehdr_addr = memparse(arg, &end);
	if (*end == '@') {
		elfcorehdr_size = elfcorehdr_addr;
		elfcorehdr_addr = memparse(end + 1, &end);
	}
	return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);
Commit	Line	Data
93a72052 OH	1	#include <linux/kernel.h>
	2	#include <linux/crash_dump.h>
	3	#include <linux/init.h>
	4	#include <linux/errno.h>
9984de1a	5	#include <linux/export.h>
93a72052 OH	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	*/
	11	unsigned 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	*/
	20	unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
	21
d3bf3795 MH	22	/*
	23	* stores the size of elf header of crash image
	24	*/
	25	unsigned long long elfcorehdr_size;
	26
93a72052 OH	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.
d3bf3795 MH	30	*
d3bf3795 MH	31	* Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
93a72052 OH	32	*/
	33	static int __init setup_elfcorehdr(char *arg)
	34	{
	35	char *end;
	36	if (!arg)
	37	return -EINVAL;
	38	elfcorehdr_addr = memparse(arg, &end);
d3bf3795 MH	39	if (*end == '@') {
	40	elfcorehdr_size = elfcorehdr_addr;
	41	elfcorehdr_addr = memparse(end + 1, &end);
	42	}
93a72052 OH	43	return end > arg ? 0 : -EINVAL;
	44	}
	45	early_param("elfcorehdr", setup_elfcorehdr);