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nmi_debug.c

/*
 * 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);

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