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#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
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);
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