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authorMika Westerberg <mika.westerberg@iki.fi>2010-05-10 09:29:32 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-07-09 15:00:53 +0100
commitcea0bb1bc59b94625e60b69aaa9ad6749d5b57dd (patch)
tree05113e4666fff28e1c1702fb7e78fd71783d75ee
parent67742c8168ed66fdd6cb5dc90e06c43cdc5bba07 (diff)
downloadlinux-cea0bb1bc59b94625e60b69aaa9ad6749d5b57dd.tar.bz2
ARM: 6122/1: kdump: add support for elfcorehdr parameter
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>
-rw-r--r--arch/arm/kernel/setup.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 714cbaaab3aa..2183bb83ac83 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -20,6 +20,7 @@
#include <linux/screen_info.h>
#include <linux/init.h>
#include <linux/kexec.h>
+#include <linux/crash_dump.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>
@@ -730,6 +731,30 @@ static void __init reserve_crashkernel(void)
static inline void reserve_crashkernel(void) {}
#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)
{
struct tag *tags = (struct tag *)&init_tags;