1 files changed, 33 insertions, 0 deletions

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 8adad1444a51..b54ff980ecd4 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2,6 +2,8 @@
  * Routines providing a simple monitor for use on the PowerMac.
  *
  * Copyright (C) 1996-2005 Paul Mackerras.
+ * Copyright (C) 2001 PPC64 Team, IBM Corp
+ * Copyrignt (C) 2006 Michael Ellerman, IBM Corp
  *
  *      This program is free software; you can redistribute it and/or
  *      modify it under the terms of the GNU General Public License
@@ -2597,3 +2599,34 @@ static int __init setup_xmon_sysrq(void)
 }
 __initcall(setup_xmon_sysrq);
 #endif /* CONFIG_MAGIC_SYSRQ */
+
+int __initdata xmon_early, xmon_off;
+
+static int __init early_parse_xmon(char *p)
+{
+        if (!p || strncmp(p, "early", 5) == 0) {
+                /* just "xmon" is equivalent to "xmon=early" */
+                xmon_init(1);
+                xmon_early = 1;
+        } else if (strncmp(p, "on", 2) == 0)
+                xmon_init(1);
+        else if (strncmp(p, "off", 3) == 0)
+                xmon_off = 1;
+        else if (strncmp(p, "nobt", 4) == 0)
+                xmon_no_auto_backtrace = 1;
+        else
+                return 1;
+
+        return 0;
+}
+early_param("xmon", early_parse_xmon);
+
+void __init xmon_setup(void)
+{
+#ifdef CONFIG_XMON_DEFAULT
+        if (!xmon_off)
+                xmon_init(1);
+#endif
+        if (xmon_early)
+                debugger(NULL);
+}