FreeBSD/Linux Kernel Cross Reference
sys/dev/random/probe.c

     /*-
      * Copyright (c) 2004 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.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/9.0/sys/dev/random/probe.c 160326 2006-07-13 11:47:36Z mr $");
    
    #include <sys/types.h>
    #include <sys/param.h>
    #include <sys/malloc.h>
    #include <sys/random.h>
    #include <sys/selinfo.h>
    #include <sys/stdint.h>
    #include <sys/sysctl.h>
    
    #if defined(__i386__) && !defined(PC98)
    #include <machine/cpufunc.h>
    #include <machine/cputypes.h>
    #include <machine/md_var.h>
    #include <machine/specialreg.h>
    #endif
    
    #include <dev/random/randomdev.h>
    #include <dev/random/randomdev_soft.h>
    #include <dev/random/nehemiah.h>
    
    void
    random_ident_hardware(struct random_systat *systat)
    {
    
            /* Set default to software */
            *systat = random_yarrow;
    
            /* Then go looking for hardware */
    #if defined(__i386__) && !defined(PC98)
            if (via_feature_rng & VIA_HAS_RNG) {
                    *systat = random_nehemiah;
            }
    #endif
    }

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