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Add header file defining a simple, yet expressive watchdog interface

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which can be implemented on all the watchdog hardware I know.
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Poul-Henning Kamp 2003-02-27 21:07:36 +00:00
parent 9434c1a30b
commit e6258fb774
1 changed files with 76 additions and 0 deletions
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sys/sys/watchdog.h Normal file
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/*-
* Copyright (c) 2003 Poul-Henning Kamp
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _SYS_WATCHDOG_H
#define _SYS__WATCHDOG_H
#include <sys/ioccom.h>
#define WDIOCPATPAT _IOW('W', 42, u_int)
#define WD_ACTIVE 0x8000000
/*
* Watchdog reset, timeout set to value in WD_INTERVAL field.
* The kernel will arm the watchdog and unless the userland
* program calls WDIOCPATPAT again before the timer expires
* the system will reinitialize.
*/
#define WD_PASSIVE 0x0400000
/*
* Set the watchdog in passive mode.
* The kernel will chose an appropriate timeout duration and
* periodically reset the timer provided everything looks all
* right to the kernel.
*/
#define WD_INTERVAL 0x00000ff
/*
* Mask for duration bits.
* The watchdog will have a nominal patience of 2^N * nanoseconds.
* Example: N == 30 gives a patience of 2^30 nanoseconds ~= 1 second.
* NB: Expect variance in the +/- 10-20% range.
*/
#ifdef _KERNEL
#define __WD_LEGAL (WD_ACTIVE | WD_PASSIVE | WD_INTERVAL)
#endif
/* Handy macros for humans not used to power of two nanoseconds */
#define WD_TO_NEVER 0
#define WD_TO_1MS 20
#define WD_TO_125MS 27
#define WD_TO_250MS 28
#define WD_TO_500MS 29
#define WD_TO_1SEC 30
#define WD_TO_2SEC 31
#define WD_TO_4SEC 32
#define WD_TO_8SEC 33
#define WD_TO_16SEC 34
#define WD_TO_32SEC 35
#endif /* _SYS_WATCHDOG_H */