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75 lines
1.5 KiB
75 lines
1.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2007 Atmel Corporation |
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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 <linux/sched/debug.h> |
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#include <linux/hardirq.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 (*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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