kernel/crash_dump.c

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

/*
 * 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.
 */
static int __init setup_elfcorehdr(char *arg)
{
	char *end;
	if (!arg)
		return -EINVAL;
	elfcorehdr_addr = memparse(arg, &end);
	return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);