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>
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.
11 unsigned long saved_max_pfn
;
14 * stores the physical address of elf header of crash image
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.
20 unsigned long long elfcorehdr_addr
= ELFCORE_ADDR_MAX
;
23 * stores the size of elf header of crash image
25 unsigned long long elfcorehdr_size
;
28 * elfcorehdr= specifies the location of elf core header stored by the crashed
29 * kernel. This option will be passed by kexec loader to the capture kernel.
31 * Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
33 static int __init
setup_elfcorehdr(char *arg
)
38 elfcorehdr_addr
= memparse(arg
, &end
);
40 elfcorehdr_size
= elfcorehdr_addr
;
41 elfcorehdr_addr
= memparse(end
+ 1, &end
);
43 return end
> arg
? 0 : -EINVAL
;
45 early_param("elfcorehdr", setup_elfcorehdr
);
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