x86: move elfcorehdr parsing to setup.c

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/setup.c

@@ -4,6 +4,7 @@
 #include <linux/bootmem.h>
 #include <linux/percpu.h>
 #include <linux/kexec.h>
+#include <linux/crash_dump.h>
 #include <asm/smp.h>
 #include <asm/percpu.h>
 #include <asm/sections.h>
@@ -501,3 +502,21 @@ void __init reserve_standard_io_resources(void)
 
 }
 
+#ifdef CONFIG_PROC_VMCORE
+/* 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
+
+
+