blob: b64e238b553b9430361127b223d2a003b70b1c99
1 | #include <linux/kernel.h> |
2 | #include <linux/crash_dump.h> |
3 | #include <linux/init.h> |
4 | #include <linux/errno.h> |
5 | #include <linux/export.h> |
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 | EXPORT_SYMBOL_GPL(elfcorehdr_addr); |
22 | |
23 | /* |
24 | * stores the size of elf header of crash image |
25 | */ |
26 | unsigned long long elfcorehdr_size; |
27 | |
28 | /* |
29 | * elfcorehdr= specifies the location of elf core header stored by the crashed |
30 | * kernel. This option will be passed by kexec loader to the capture kernel. |
31 | * |
32 | * Syntax: elfcorehdr=[size[KMG]@]offset[KMG] |
33 | */ |
34 | static int __init setup_elfcorehdr(char *arg) |
35 | { |
36 | char *end; |
37 | if (!arg) |
38 | return -EINVAL; |
39 | elfcorehdr_addr = memparse(arg, &end); |
40 | if (*end == '@') { |
41 | elfcorehdr_size = elfcorehdr_addr; |
42 | elfcorehdr_addr = memparse(end + 1, &end); |
43 | } |
44 | return end > arg ? 0 : -EINVAL; |
45 | } |
46 | early_param("elfcorehdr", setup_elfcorehdr); |
47 |