The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/watchdog.h

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    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: releng/8.3/sys/sys/watchdog.h 221939 2011-05-15 01:08:51Z attilio $
   27  */
   28 #ifndef _SYS_WATCHDOG_H
   29 #define _SYS_WATCHDOG_H
   30 
   31 #include <sys/ioccom.h>
   32 
   33 #define _PATH_WATCHDOG  "fido"
   34 
   35 #define WDIOCPATPAT     _IOW('W', 42, u_int)
   36 
   37 #define WD_ACTIVE       0x8000000
   38         /* 
   39          * Watchdog reset, timeout set to value in WD_INTERVAL field.
   40          * The kernel will arm the watchdog and unless the userland
   41          * program calls WDIOCPATPAT again before the timer expires
   42          * the system will reinitialize.
   43          */
   44 
   45 #define WD_PASSIVE      0x0400000
   46         /*
   47          * Set the watchdog in passive mode.
   48          * The kernel will chose an appropriate timeout duration and
   49          * periodically reset the timer provided everything looks all
   50          * right to the kernel.
   51          */
   52 
   53 #define WD_LASTVAL      0x0200000
   54         /*
   55          * Use the already last used timeout value.
   56          * The kernel will use as timeout the last valid timeout provided.
   57          */
   58 
   59 #define WD_INTERVAL     0x00000ff
   60         /*
   61          * Mask for duration bits.
   62          * The watchdog will have a nominal patience of 2^N * nanoseconds.
   63          * Example:  N == 30 gives a patience of 2^30 nanoseconds ~= 1 second.
   64          * NB: Expect variance in the +/- 10-20% range.
   65          */
   66 
   67 /* Handy macros for humans not used to power of two nanoseconds */
   68 #define WD_TO_NEVER     0
   69 #define WD_TO_1MS       20
   70 #define WD_TO_125MS     27
   71 #define WD_TO_250MS     28
   72 #define WD_TO_500MS     29
   73 #define WD_TO_1SEC      30
   74 #define WD_TO_2SEC      31
   75 #define WD_TO_4SEC      32
   76 #define WD_TO_8SEC      33
   77 #define WD_TO_16SEC     34
   78 #define WD_TO_32SEC     35
   79 
   80 #ifdef _KERNEL
   81 
   82 #include <sys/eventhandler.h>
   83 
   84 typedef void (*watchdog_fn)(void *, u_int, int *);
   85 
   86 EVENTHANDLER_DECLARE(watchdog_list, watchdog_fn);
   87 
   88 u_int   wdog_kern_last_timeout(void);
   89 int     wdog_kern_pat(u_int utim);
   90 #endif
   91 
   92 #endif /* _SYS_WATCHDOG_H */

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