e7ba176b47
Change the NMI handler to use the die notifier chain to signal anyone who cares. Add a simple "nmi debugger" which hooks into this chain and that may dump registers, task state, etc. when it happens. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
/*
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* Copyright (C) 2007 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/kdebug.h>
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#include <linux/notifier.h>
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#include <linux/sched.h>
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#include <asm/irq.h>
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enum nmi_action {
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NMI_SHOW_STATE = 1 << 0,
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NMI_SHOW_REGS = 1 << 1,
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NMI_DIE = 1 << 2,
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NMI_DEBOUNCE = 1 << 3,
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};
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static unsigned long nmi_actions;
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static int nmi_debug_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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struct die_args *args = data;
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if (likely(val != DIE_NMI))
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return NOTIFY_DONE;
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if (nmi_actions & NMI_SHOW_STATE)
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show_state();
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if (nmi_actions & NMI_SHOW_REGS)
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show_regs(args->regs);
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if (nmi_actions & NMI_DEBOUNCE)
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mdelay(10);
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if (nmi_actions & NMI_DIE)
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return NOTIFY_BAD;
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return NOTIFY_OK;
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}
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static struct notifier_block nmi_debug_nb = {
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.notifier_call = nmi_debug_notify,
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};
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static int __init nmi_debug_setup(char *str)
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{
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char *p, *sep;
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register_die_notifier(&nmi_debug_nb);
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if (nmi_enable()) {
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printk(KERN_WARNING "Unable to enable NMI.\n");
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return 0;
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}
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if (*str != '=')
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return 0;
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for (p = str + 1; *p; p = sep + 1) {
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sep = strchr(p, ',');
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if (sep)
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*sep = 0;
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if (strcmp(p, "state") == 0)
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nmi_actions |= NMI_SHOW_STATE;
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else if (strcmp(p, "regs") == 0)
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nmi_actions |= NMI_SHOW_REGS;
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else if (strcmp(p, "debounce") == 0)
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nmi_actions |= NMI_DEBOUNCE;
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else if (strcmp(p, "die") == 0)
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nmi_actions |= NMI_DIE;
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else
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printk(KERN_WARNING "NMI: Unrecognized action `%s'\n",
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p);
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if (!sep)
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break;
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}
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return 0;
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}
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__setup("nmi_debug", nmi_debug_setup);
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