| #include <linux/kernel.h> |
| #include <linux/crash_dump.h> |
| #include <linux/module.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; |
| * 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. |
| static int __init setup_elfcorehdr(char *arg) |
| elfcorehdr_addr = memparse(arg, &end); |
| return end > arg ? 0 : -EINVAL; |
| early_param("elfcorehdr", setup_elfcorehdr); |