Commit | Line | Data |
---|---|---|
93a72052 OH |
1 | #include <linux/kernel.h> |
2 | #include <linux/crash_dump.h> | |
3 | #include <linux/init.h> | |
4 | #include <linux/errno.h> | |
5 | #include <linux/module.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 | ||
22 | /* | |
23 | * elfcorehdr= specifies the location of elf core header stored by the crashed | |
24 | * kernel. This option will be passed by kexec loader to the capture kernel. | |
25 | */ | |
26 | static int __init setup_elfcorehdr(char *arg) | |
27 | { | |
28 | char *end; | |
29 | if (!arg) | |
30 | return -EINVAL; | |
31 | elfcorehdr_addr = memparse(arg, &end); | |
32 | return end > arg ? 0 : -EINVAL; | |
33 | } | |
34 | early_param("elfcorehdr", setup_elfcorehdr); |