FreeBSD/Linux Kernel Cross Reference
sys/sys/watchdog.h
1 /*-
2 * Copyright (c) 2003 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/sys/watchdog.h,v 1.3 2004/02/28 20:06:58 phk Exp $
27 */
28 #ifndef _SYS_WATCHDOG_H
29 #define _SYS_WATCHDOG_H
30
31 #include <sys/ioccom.h>
32
33 #ifdef I_HAVE_TOTALLY_LOST_MY_SENSE_OF_HUMOUR
34 #define _PATH_WATCHDOG "watchdog"
35 #else
36 #define _PATH_WATCHDOG "fido"
37 #endif
38
39 #define WDIOCPATPAT _IOW('W', 42, u_int)
40
41 #define WD_ACTIVE 0x8000000
42 /*
43 * Watchdog reset, timeout set to value in WD_INTERVAL field.
44 * The kernel will arm the watchdog and unless the userland
45 * program calls WDIOCPATPAT again before the timer expires
46 * the system will reinitialize.
47 */
48
49 #define WD_PASSIVE 0x0400000
50 /*
51 * Set the watchdog in passive mode.
52 * The kernel will chose an appropriate timeout duration and
53 * periodically reset the timer provided everything looks all
54 * right to the kernel.
55 */
56
57 #define WD_INTERVAL 0x00000ff
58 /*
59 * Mask for duration bits.
60 * The watchdog will have a nominal patience of 2^N * nanoseconds.
61 * Example: N == 30 gives a patience of 2^30 nanoseconds ~= 1 second.
62 * NB: Expect variance in the +/- 10-20% range.
63 */
64
65 /* Handy macros for humans not used to power of two nanoseconds */
66 #define WD_TO_NEVER 0
67 #define WD_TO_1MS 20
68 #define WD_TO_125MS 27
69 #define WD_TO_250MS 28
70 #define WD_TO_500MS 29
71 #define WD_TO_1SEC 30
72 #define WD_TO_2SEC 31
73 #define WD_TO_4SEC 32
74 #define WD_TO_8SEC 33
75 #define WD_TO_16SEC 34
76 #define WD_TO_32SEC 35
77
78 #ifdef _KERNEL
79
80 #include <sys/eventhandler.h>
81
82 typedef void (*watchdog_fn)(void *, u_int, int *);
83
84 EVENTHANDLER_DECLARE(watchdog_list, watchdog_fn);
85 #endif
86
87 #endif /* _SYS_WATCHDOG_H */
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