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hyperentropy.c revision 1.2.4.2 
      1  1.2.4.2  rmind /*	$NetBSD: hyperentropy.c,v 1.2.4.2 2014/05/18 17:46:18 rmind Exp $	*/
      2  1.2.4.2  rmind 
      3  1.2.4.2  rmind /*
      4  1.2.4.2  rmind  * Copyright (c) 2014 Antti Kantee.  All Rights Reserved.
      5  1.2.4.2  rmind  *
      6  1.2.4.2  rmind  * Redistribution and use in source and binary forms, with or without
      7  1.2.4.2  rmind  * modification, are permitted provided that the following conditions
      8  1.2.4.2  rmind  * are met:
      9  1.2.4.2  rmind  * 1. Redistributions of source code must retain the above copyright
     10  1.2.4.2  rmind  *    notice, this list of conditions and the following disclaimer.
     11  1.2.4.2  rmind  * 2. Redistributions in binary form must reproduce the above copyright
     12  1.2.4.2  rmind  *    notice, this list of conditions and the following disclaimer in the
     13  1.2.4.2  rmind  *    documentation and/or other materials provided with the distribution.
     14  1.2.4.2  rmind  *
     15  1.2.4.2  rmind  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  1.2.4.2  rmind  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  1.2.4.2  rmind  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  1.2.4.2  rmind  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  1.2.4.2  rmind  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  1.2.4.2  rmind  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  1.2.4.2  rmind  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  1.2.4.2  rmind  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  1.2.4.2  rmind  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  1.2.4.2  rmind  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  1.2.4.2  rmind  * SUCH DAMAGE.
     26  1.2.4.2  rmind  */
     27  1.2.4.2  rmind 
     28  1.2.4.2  rmind #include <sys/cdefs.h>
     29  1.2.4.2  rmind __KERNEL_RCSID(0, "$NetBSD: hyperentropy.c,v 1.2.4.2 2014/05/18 17:46:18 rmind Exp $");
     30  1.2.4.2  rmind 
     31  1.2.4.2  rmind #include <sys/param.h>
     32  1.2.4.2  rmind #include <sys/kmem.h>
     33  1.2.4.2  rmind #include <sys/rnd.h>
     34  1.2.4.2  rmind 
     35  1.2.4.2  rmind #include <rump/rumpuser.h>
     36  1.2.4.2  rmind 
     37  1.2.4.2  rmind #include "rump_private.h"
     38  1.2.4.2  rmind 
     39  1.2.4.2  rmind static krndsource_t rndsrc;
     40  1.2.4.2  rmind 
     41  1.2.4.2  rmind #define MAXGET (RND_POOLBITS/NBBY)
     42  1.2.4.2  rmind static void
     43  1.2.4.2  rmind feedrandom(size_t bytes, void *arg)
     44  1.2.4.2  rmind {
     45  1.2.4.2  rmind 	uint8_t *rnddata;
     46  1.2.4.2  rmind 	size_t dsize;
     47  1.2.4.2  rmind 
     48  1.2.4.2  rmind 	rnddata = kmem_intr_alloc(MAXGET, KM_SLEEP);
     49  1.2.4.2  rmind 	if (rumpuser_getrandom(rnddata, MIN(MAXGET, bytes),
     50  1.2.4.2  rmind 	    RUMPUSER_RANDOM_HARD|RUMPUSER_RANDOM_NOWAIT, &dsize) == 0)
     51  1.2.4.2  rmind 		rnd_add_data(&rndsrc, rnddata, dsize, NBBY*dsize);
     52  1.2.4.2  rmind 	kmem_intr_free(rnddata, MAXGET);
     53  1.2.4.2  rmind }
     54  1.2.4.2  rmind 
     55  1.2.4.2  rmind void
     56  1.2.4.2  rmind rump_hyperentropy_init(void)
     57  1.2.4.2  rmind {
     58  1.2.4.2  rmind 
     59  1.2.4.2  rmind 	if (rump_threads) {
     60  1.2.4.2  rmind 		rndsource_setcb(&rndsrc, feedrandom, &rndsrc);
     61  1.2.4.2  rmind 		rnd_attach_source(&rndsrc, "rump_hyperent", RND_TYPE_VM,
     62  1.2.4.2  rmind 		    RND_FLAG_NO_ESTIMATE|RND_FLAG_HASCB);
     63  1.2.4.2  rmind 	} else {
     64  1.2.4.2  rmind 		/* without threads, just fill the pool */
     65  1.2.4.2  rmind 		rnd_attach_source(&rndsrc, "rump_hyperent", RND_TYPE_VM,
     66  1.2.4.2  rmind 		    RND_FLAG_NO_ESTIMATE);
     67  1.2.4.2  rmind 		feedrandom(RND_POOLBITS/NBBY, NULL);
     68  1.2.4.2  rmind 	}
     69  1.2.4.2  rmind }
     70