watchdog.h revision 116805 
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: head/sys/sys/watchdog.h 116805 2003-06-25 08:30:45Z phk $
27 */
28#ifndef _SYS_WATCHDOG_H
29#define	_SYS_WATCHDOG_H
30
31#include <sys/ioccom.h>
32
33#define WDIOCPATPAT	_IOW('W', 42, u_int)
34
35#define WD_ACTIVE	0x8000000
36	/*
37	 * Watchdog reset, timeout set to value in WD_INTERVAL field.
38	 * The kernel will arm the watchdog and unless the userland
39	 * program calls WDIOCPATPAT again before the timer expires
40	 * the system will reinitialize.
41	 */
42
43#define WD_PASSIVE	0x0400000
44	/*
45	 * Set the watchdog in passive mode.
46	 * The kernel will chose an appropriate timeout duration and
47	 * periodically reset the timer provided everything looks all
48	 * right to the kernel.
49 	 */
50
51#define WD_INTERVAL	0x00000ff
52	/*
53	 * Mask for duration bits.
54	 * The watchdog will have a nominal patience of 2^N * nanoseconds.
55	 * Example:  N == 30 gives a patience of 2^30 nanoseconds ~= 1 second.
56	 * NB: Expect variance in the +/- 10-20% range.
57	 */
58
59#ifdef _KERNEL
60#define __WD_LEGAL	(WD_ACTIVE | WD_PASSIVE | WD_INTERVAL)
61#endif
62
63/* Handy macros for humans not used to power of two nanoseconds */
64#define WD_TO_NEVER	0
65#define WD_TO_1MS	20
66#define WD_TO_125MS	27
67#define WD_TO_250MS	28
68#define WD_TO_500MS	29
69#define WD_TO_1SEC	30
70#define WD_TO_2SEC	31
71#define WD_TO_4SEC	32
72#define WD_TO_8SEC	33
73#define WD_TO_16SEC	34
74#define WD_TO_32SEC	35
75
76#endif /* _SYS_WATCHDOG_H */
77