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