linux/kernel/crash_dump.c at master · fabgithub/linux · GitHub

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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

* 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);