| Haavard Skinnemoen | e7ba176 | 2007-10-10 14:58:29 +0200 | [diff] [blame] | 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 | |
| 15 | enum 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 | |
| 22 | static unsigned long nmi_actions; |
| 23 | |
| 24 | static 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 | |
| 44 | static struct notifier_block nmi_debug_nb = { |
| 45 | .notifier_call = nmi_debug_notify, |
| 46 | }; |
| 47 | |
| 48 | static 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); |