| Olaf Hering | 93a7205 | 2011-03-23 16:43:29 -0700 | [diff] [blame] | 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); |