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ARM: 6122/1: kdump: add support for elfcorehdr parameter

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This parameter is used by primary kernel to pass address of vmcore
header to the dump capture kernel.

Signed-off-by: Mika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Mika Westerberg 2010-05-10 09:29:32 +01:00 committed by Russell King
parent 67742c8168
commit cea0bb1bc5
1 changed files with 25 additions and 0 deletions
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25
arch/arm/kernel/setup.c
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@ -20,6 +20,7 @@
#include <linux/screen_info.h> #include <linux/screen_info.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/kexec.h> #include <linux/kexec.h>
#include <linux/crash_dump.h>
#include <linux/root_dev.h> #include <linux/root_dev.h>
#include <linux/cpu.h> #include <linux/cpu.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
@ -730,6 +731,30 @@ static void __init reserve_crashkernel(void)
static inline void reserve_crashkernel(void) {} static inline void reserve_crashkernel(void) {}
#endif /* CONFIG_KEXEC */ #endif /* CONFIG_KEXEC */
/*
* 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
* ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
*/
#ifdef CONFIG_CRASH_DUMP
/*
* 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)
{
char *end;
if (!arg)
return -EINVAL;
elfcorehdr_addr = memparse(arg, &end);
return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);
#endif /* CONFIG_CRASH_DUMP */
void __init setup_arch(char **cmdline_p) void __init setup_arch(char **cmdline_p)
{ {
struct tag *tags = (struct tag *)&init_tags; struct tag *tags = (struct tag *)&init_tags;