1 | // SPDX-License-Identifier: GPL-2.0-only |
---|---|
2 | #include <linux/kernel.h> |
3 | #include <linux/crash_dump.h> |
4 | #include <linux/init.h> |
5 | #include <linux/errno.h> |
6 | #include <linux/export.h> |
7 | |
8 | /* |
9 | * stores the physical address of elf header of crash image |
10 | * |
11 | * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by |
12 | * is_kdump_kernel() to determine if we are booting after a panic. Hence put |
13 | * it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE. |
14 | */ |
15 | unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX; |
16 | EXPORT_SYMBOL_GPL(elfcorehdr_addr); |
17 | |
18 | /* |
19 | * stores the size of elf header of crash image |
20 | */ |
21 | unsigned long long elfcorehdr_size; |
22 | |
23 | /* |
24 | * elfcorehdr= specifies the location of elf core header stored by the crashed |
25 | * kernel. This option will be passed by kexec loader to the capture kernel. |
26 | * |
27 | * Syntax: elfcorehdr=[size[KMG]@]offset[KMG] |
28 | */ |
29 | static int __init setup_elfcorehdr(char *arg) |
30 | { |
31 | char *end; |
32 | if (!arg) |
33 | return -EINVAL; |
34 | elfcorehdr_addr = memparse(ptr: arg, retptr: &end); |
35 | if (*end == '@') { |
36 | elfcorehdr_size = elfcorehdr_addr; |
37 | elfcorehdr_addr = memparse(ptr: end + 1, retptr: &end); |
38 | } |
39 | return end > arg ? 0 : -EINVAL; |
40 | } |
41 | early_param("elfcorehdr", setup_elfcorehdr); |
42 |