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

     /*-
      * 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: releng/5.2/sys/sys/watchdog.h 116805 2003-06-25 08:30:45Z phk $
     */
    #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 */

Cache object: 29865bc7e1033fe5be9ae9ef81894fa4