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1e1030dc PM |
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 | #include <linux/hardirq.h> | |
13 | ||
14 | enum nmi_action { | |
15 | NMI_SHOW_STATE = 1 << 0, | |
16 | NMI_SHOW_REGS = 1 << 1, | |
17 | NMI_DIE = 1 << 2, | |
18 | NMI_DEBOUNCE = 1 << 3, | |
19 | }; | |
20 | ||
21 | static unsigned long nmi_actions; | |
22 | ||
23 | static int nmi_debug_notify(struct notifier_block *self, | |
24 | unsigned long val, void *data) | |
25 | { | |
26 | struct die_args *args = data; | |
27 | ||
28 | if (likely(val != DIE_NMI)) | |
29 | return NOTIFY_DONE; | |
30 | ||
31 | if (nmi_actions & NMI_SHOW_STATE) | |
32 | show_state(); | |
33 | if (nmi_actions & NMI_SHOW_REGS) | |
34 | show_regs(args->regs); | |
35 | if (nmi_actions & NMI_DEBOUNCE) | |
36 | mdelay(10); | |
37 | if (nmi_actions & NMI_DIE) | |
38 | return NOTIFY_BAD; | |
39 | ||
40 | return NOTIFY_OK; | |
41 | } | |
42 | ||
43 | static struct notifier_block nmi_debug_nb = { | |
44 | .notifier_call = nmi_debug_notify, | |
45 | }; | |
46 | ||
47 | static int __init nmi_debug_setup(char *str) | |
48 | { | |
49 | char *p, *sep; | |
50 | ||
51 | register_die_notifier(&nmi_debug_nb); | |
52 | ||
53 | if (*str != '=') | |
54 | return 0; | |
55 | ||
56 | for (p = str + 1; *p; p = sep + 1) { | |
57 | sep = strchr(p, ','); | |
58 | if (sep) | |
59 | *sep = 0; | |
60 | if (strcmp(p, "state") == 0) | |
61 | nmi_actions |= NMI_SHOW_STATE; | |
62 | else if (strcmp(p, "regs") == 0) | |
63 | nmi_actions |= NMI_SHOW_REGS; | |
64 | else if (strcmp(p, "debounce") == 0) | |
65 | nmi_actions |= NMI_DEBOUNCE; | |
66 | else if (strcmp(p, "die") == 0) | |
67 | nmi_actions |= NMI_DIE; | |
68 | else | |
69 | printk(KERN_WARNING "NMI: Unrecognized action `%s'\n", | |
70 | p); | |
71 | if (!sep) | |
72 | break; | |
73 | } | |
74 | ||
75 | return 0; | |
76 | } | |
77 | __setup("nmi_debug", nmi_debug_setup); |