Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / avr32 / kernel / nmi_debug.c

diff --git a/kernel/arch/avr32/kernel/nmi_debug.c b/kernel/arch/avr32/kernel/nmi_debug.c
new file mode 100644 (file)
index 0000000..3414b85
--- /dev/null
+++ b/kernel/arch/avr32/kernel/nmi_debug.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/delay.h>
+#include <linux/kdebug.h>
+#include <linux/notifier.h>
+#include <linux/sched.h>
+
+#include <asm/irq.h>
+
+enum nmi_action {
+       NMI_SHOW_STATE  = 1 << 0,
+       NMI_SHOW_REGS   = 1 << 1,
+       NMI_DIE         = 1 << 2,
+       NMI_DEBOUNCE    = 1 << 3,
+};
+
+static unsigned long nmi_actions;
+
+static int nmi_debug_notify(struct notifier_block *self,
+               unsigned long val, void *data)
+{
+       struct die_args *args = data;
+
+       if (likely(val != DIE_NMI))
+               return NOTIFY_DONE;
+
+       if (nmi_actions & NMI_SHOW_STATE)
+               show_state();
+       if (nmi_actions & NMI_SHOW_REGS)
+               show_regs(args->regs);
+       if (nmi_actions & NMI_DEBOUNCE)
+               mdelay(10);
+       if (nmi_actions & NMI_DIE)
+               return NOTIFY_BAD;
+
+       return NOTIFY_OK;
+}
+
+static struct notifier_block nmi_debug_nb = {
+       .notifier_call = nmi_debug_notify,
+};
+
+static int __init nmi_debug_setup(char *str)
+{
+       char *p, *sep;
+
+       register_die_notifier(&nmi_debug_nb);
+       if (nmi_enable()) {
+               printk(KERN_WARNING "Unable to enable NMI.\n");
+               return 0;
+       }
+
+       if (*str != '=')
+               return 0;
+
+       for (p = str + 1; *p; p = sep + 1) {
+               sep = strchr(p, ',');
+               if (sep)
+                       *sep = 0;
+               if (strcmp(p, "state") == 0)
+                       nmi_actions |= NMI_SHOW_STATE;
+               else if (strcmp(p, "regs") == 0)
+                       nmi_actions |= NMI_SHOW_REGS;
+               else if (strcmp(p, "debounce") == 0)
+                       nmi_actions |= NMI_DEBOUNCE;
+               else if (strcmp(p, "die") == 0)
+                       nmi_actions |= NMI_DIE;
+               else
+                       printk(KERN_WARNING "NMI: Unrecognized action `%s'\n",
+                               p);
+               if (!sep)
+                       break;
+       }
+
+       return 0;
+}
+__setup("nmi_debug", nmi_debug_setup);