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/mips/cavium/octeon_rnd.c

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    1 /*-
    2  * Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/8.4/sys/mips/cavium/octeon_rnd.c 215938 2010-11-27 12:26:40Z jchandra $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/8.4/sys/mips/cavium/octeon_rnd.c 215938 2010-11-27 12:26:40Z jchandra $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/clock.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/module.h>
   39 #include <sys/random.h>
   40 
   41 #include <contrib/octeon-sdk/cvmx.h>
   42 #include <contrib/octeon-sdk/cvmx-rng.h>
   43 
   44 /*
   45  * XXX
   46  * random_harvest(9) says to call it with no more than 16 bytes, but at least
   47  * safe(4) seems to violate that rule.
   48  */
   49 #define OCTEON_RND_WORDS        2
   50 
   51 struct octeon_rnd_softc {
   52         uint64_t sc_entropy[OCTEON_RND_WORDS];
   53         struct callout sc_callout;
   54 };
   55 
   56 static void     octeon_rnd_identify(driver_t *drv, device_t parent);
   57 static int      octeon_rnd_attach(device_t dev);
   58 static int      octeon_rnd_probe(device_t dev);
   59 static int      octeon_rnd_detach(device_t dev);
   60 
   61 static void     octeon_rnd_harvest(void *);
   62 
   63 static device_method_t octeon_rnd_methods[] = {
   64         /* Device interface */
   65         DEVMETHOD(device_identify,      octeon_rnd_identify),
   66         DEVMETHOD(device_probe,         octeon_rnd_probe),
   67         DEVMETHOD(device_attach,        octeon_rnd_attach),
   68         DEVMETHOD(device_detach,        octeon_rnd_detach),
   69 
   70         { 0, 0 }
   71 };
   72 
   73 static driver_t octeon_rnd_driver = {
   74         "rnd",
   75         octeon_rnd_methods,
   76         sizeof (struct octeon_rnd_softc)
   77 };
   78 static devclass_t octeon_rnd_devclass;
   79 DRIVER_MODULE(rnd, nexus, octeon_rnd_driver, octeon_rnd_devclass, 0, 0);
   80 
   81 static void
   82 octeon_rnd_identify(driver_t *drv, device_t parent)
   83 {
   84         BUS_ADD_CHILD(parent, 0, "rnd", 0);
   85 }
   86 
   87 static int
   88 octeon_rnd_probe(device_t dev)
   89 {
   90         if (device_get_unit(dev) != 0)
   91                 return (ENXIO);
   92 
   93         device_set_desc(dev, "Cavium Octeon Random Number Generator");
   94         return (0);
   95 }
   96 
   97 static int
   98 octeon_rnd_attach(device_t dev)
   99 {
  100         struct octeon_rnd_softc *sc;
  101 
  102         sc = device_get_softc(dev);
  103         callout_init(&sc->sc_callout, CALLOUT_MPSAFE);
  104         callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
  105 
  106         cvmx_rng_enable();
  107 
  108         return (0);
  109 }
  110 
  111 static int
  112 octeon_rnd_detach(device_t dev)
  113 {
  114         struct octeon_rnd_softc *sc;
  115 
  116         sc = device_get_softc(dev);
  117 
  118         callout_stop(&sc->sc_callout);
  119 
  120         return (0);
  121 }
  122 
  123 static void
  124 octeon_rnd_harvest(void *arg)
  125 {
  126         struct octeon_rnd_softc *sc;
  127         unsigned i;
  128 
  129         sc = arg;
  130 
  131         for (i = 0; i < OCTEON_RND_WORDS; i++)
  132                 sc->sc_entropy[i] = cvmx_rng_get_random64();
  133         random_harvest(sc->sc_entropy, sizeof sc->sc_entropy,
  134                        sizeof sc->sc_entropy * 8, 0, RANDOM_PURE);
  135 
  136         callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
  137 }

Cache object: b6f2aadd501388b97622dde1d3cdc184


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