FreeBSD/Linux Kernel Cross Reference
sys/dev/random/other_algorithm.h

     /*-
      * Copyright (c) 2015 Mark R V Murray
      * 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
     *    in this position and unchanged.
     * 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 ``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 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.
     *
     * $FreeBSD$
     */
    
    /*-
     * This is a skeleton for folks who wish to build a loadable module
     * containing an alternative entropy-processing algorithm for random(4).
     *
     * The functions below should be completed with the appropriate code,
     * and the nearby fortuna.c may be consulted for examples of working code.
     *
     * The author is willing to provide reasonable help to those wishing to
     * write such a module for themselves. Please use the markm@ FreeBSD
     * email address, and ensure that you are developing this on a suitably
     * supported branch (This is currently 12-CURRENT, and may be no
     * older than 12-STABLE in the future).
     */
    
    #ifndef SYS_DEV_RANDOM_OTHER_H_INCLUDED
    #define SYS_DEV_RANDOM_OTHER_H_INCLUDED
    
    #ifdef _KERNEL
    typedef struct mtx mtx_t;
    #define RANDOM_RESEED_INIT_LOCK(x)              mtx_init(&other_mtx, "reseed mutex", NULL, MTX_DEF)
    #define RANDOM_RESEED_DEINIT_LOCK(x)            mtx_destroy(&other_mtx)
    #define RANDOM_RESEED_LOCK(x)                   mtx_lock(&other_mtx)
    #define RANDOM_RESEED_UNLOCK(x)                 mtx_unlock(&other_mtx)
    #define RANDOM_RESEED_ASSERT_LOCK_OWNED(x)      mtx_assert(&other_mtx, MA_OWNED)
    #else
    #define RANDOM_RESEED_INIT_LOCK(x)              mtx_init(&other_mtx, mtx_plain)
    #define RANDOM_RESEED_DEINIT_LOCK(x)            mtx_destroy(&other_mtx)
    #define RANDOM_RESEED_LOCK(x)                   mtx_lock(&other_mtx)
    #define RANDOM_RESEED_UNLOCK(x)                 mtx_unlock(&other_mtx)
    #define RANDOM_RESEED_ASSERT_LOCK_OWNED(x)
    #endif
    
    #endif /* SYS_DEV_RANDOM_OTHER_H_INCLUDED */

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