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  * Copyright (c) 2013 iXsystems.com,
    4  *                    author: Alfred Perlstein <alfred@freebsd.org>
    5  *
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: stable/10/sys/sys/watchdog.h 247405 2013-02-27 19:03:31Z alfred $
   30  */
   31 #ifndef _SYS_WATCHDOG_H
   32 #define _SYS_WATCHDOG_H
   33 
   34 #include <sys/ioccom.h>
   35 
   36 #define _PATH_WATCHDOG  "fido"
   37 
   38 #define WDIOCPATPAT     _IOW('W', 42, u_int)    /* pat the watchdog */
   39 #define WDIOC_SETTIMEOUT    _IOW('W', 43, int)  /* set/reset the timer */
   40 #define WDIOC_GETTIMEOUT    _IOR('W', 44, int)  /* get total timeout */
   41 #define WDIOC_GETTIMELEFT   _IOR('W', 45, int)  /* get time left */
   42 #define WDIOC_GETPRETIMEOUT _IOR('W', 46, int)  /* get the pre-timeout */
   43 #define WDIOC_SETPRETIMEOUT _IOW('W', 47, int)  /* set the pre-timeout */
   44 /* set the action when a pre-timeout occurs see: WD_SOFT_* */
   45 #define WDIOC_SETPRETIMEOUTACT _IOW('W', 48, int)
   46 
   47 /* use software watchdog instead of hardware */
   48 #define WDIOC_SETSOFT   _IOW('W', 49, int)
   49 #define WDIOC_SETSOFTTIMEOUTACT _IOW('W', 50, int)
   50 
   51 #define WD_ACTIVE       0x8000000
   52         /* 
   53          * Watchdog reset, timeout set to value in WD_INTERVAL field.
   54          * The kernel will arm the watchdog and unless the userland
   55          * program calls WDIOCPATPAT again before the timer expires
   56          * the system will reinitialize.
   57          */
   58 
   59 #define WD_PASSIVE      0x0400000
   60         /*
   61          * Set the watchdog in passive mode.
   62          * The kernel will chose an appropriate timeout duration and
   63          * periodically reset the timer provided everything looks all
   64          * right to the kernel.
   65          */
   66 
   67 #define WD_LASTVAL      0x0200000
   68         /*
   69          * Use the already last used timeout value.
   70          * The kernel will use as timeout the last valid timeout provided.
   71          */
   72 
   73 #define WD_INTERVAL     0x00000ff
   74         /*
   75          * Mask for duration bits.
   76          * The watchdog will have a nominal patience of 2^N * nanoseconds.
   77          * Example:  N == 30 gives a patience of 2^30 nanoseconds ~= 1 second.
   78          * NB: Expect variance in the +/- 10-20% range.
   79          */
   80 
   81 /* Handy macros for humans not used to power of two nanoseconds */
   82 #define WD_TO_NEVER     0
   83 #define WD_TO_1MS       20
   84 #define WD_TO_125MS     27
   85 #define WD_TO_250MS     28
   86 #define WD_TO_500MS     29
   87 #define WD_TO_1SEC      30
   88 #define WD_TO_2SEC      31
   89 #define WD_TO_4SEC      32
   90 #define WD_TO_8SEC      33
   91 #define WD_TO_16SEC     34
   92 #define WD_TO_32SEC     35
   93 #define WD_TO_64SEC     36
   94 #define WD_TO_128SEC    37
   95 
   96 /* action on pre-timeout trigger */
   97 #define WD_SOFT_PANIC   0x01    /* panic */
   98 #define WD_SOFT_DDB     0x02    /* enter debugger */
   99 #define WD_SOFT_LOG     0x04    /* log(9) */
  100 #define WD_SOFT_PRINTF  0x08    /* printf(9) */
  101 #define WD_SOFT_MASK    0x0f    /* all of the above */
  102 
  103 #ifdef _KERNEL
  104 
  105 #include <sys/eventhandler.h>
  106 
  107 typedef void (*watchdog_fn)(void *, u_int, int *);
  108 
  109 EVENTHANDLER_DECLARE(watchdog_list, watchdog_fn);
  110 
  111 u_int   wdog_kern_last_timeout(void);
  112 int     wdog_kern_pat(u_int utim);
  113 #endif
  114 
  115 #endif /* _SYS_WATCHDOG_H */

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