LXR linux/arch/avr32/kernel/nmi

   1/*
   2 * Copyright (C) 2007 Atmel Corporation
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 */
   8#include <linux/delay.h>
   9#include <linux/kdebug.h>
  10#include <linux/notifier.h>
  11#include <linux/sched.h>
  12
  13#include <asm/irq.h>
  14
  15enum nmi_action {
  16        NMI_SHOW_STATE  = 1 << 0,
  17        NMI_SHOW_REGS   = 1 << 1,
  18        NMI_DIE         = 1 << 2,
  19        NMI_DEBOUNCE    = 1 << 3,
  20};
  21
  22static unsigned long nmi_actions;
  23
  24static int nmi_debug_notify(struct notifier_block *self,
  25                unsigned long val, void *data)
  26{
  27        struct die_args *args = data;
  28
  29        if (likely(val != DIE_NMI))
  30                return NOTIFY_DONE;
  31
  32        if (nmi_actions & NMI_SHOW_STATE)
  33                show_state();
  34        if (nmi_actions & NMI_SHOW_REGS)
  35                show_regs(args->regs);
  36        if (nmi_actions & NMI_DEBOUNCE)
  37                mdelay(10);
  38        if (nmi_actions & NMI_DIE)
  39                return NOTIFY_BAD;
  40
  41        return NOTIFY_OK;
  42}
  43
  44static struct notifier_block nmi_debug_nb = {
  45        .notifier_call = nmi_debug_notify,
  46};
  47
  48static int __init nmi_debug_setup(char *str)
  49{
  50        char *p, *sep;
  51
  52        register_die_notifier(&nmi_debug_nb);
  53        if (nmi_enable()) {
  54                printk(KERN_WARNING "Unable to enable NMI.\n");
  55                return 0;
  56        }
  57
  58        if (*str != '=')
  59                return 0;
  60
  61        for (p = str + 1; *p; p = sep + 1) {
  62                sep = strchr(p, ',');
  63                if (sep)
  64                        *sep = 0;
  65                if (strcmp(p, "state") == 0)
  66                        nmi_actions |= NMI_SHOW_STATE;
  67                else if (strcmp(p, "regs") == 0)
  68                        nmi_actions |= NMI_SHOW_REGS;
  69                else if (strcmp(p, "debounce") == 0)
  70                        nmi_actions |= NMI_DEBOUNCE;
  71                else if (strcmp(p, "die") == 0)
  72                        nmi_actions |= NMI_DIE;
  73                else
  74                        printk(KERN_WARNING "NMI: Unrecognized action `%s'\n",
  75                                p);
  76                if (!sep)
  77                        break;
  78        }
  79
  80        return 0;
  81}
  82__setup("nmi_debug", nmi_debug_setup);
  83