/* * 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 <linux/sched/debug.h> #include <linux/hardirq.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 (*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);