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: stable/10/sys/mips/cavium/octeon_rnd.c 314667 2017-03-04 13:03:31Z avg $
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/10/sys/mips/cavium/octeon_rnd.c 314667 2017-03-04 13:03:31Z avg $");
   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 #define OCTEON_RND_WORDS        2
   45 
   46 struct octeon_rnd_softc {
   47         uint64_t sc_entropy[OCTEON_RND_WORDS];
   48         struct callout sc_callout;
   49 };
   50 
   51 static void     octeon_rnd_identify(driver_t *drv, device_t parent);
   52 static int      octeon_rnd_attach(device_t dev);
   53 static int      octeon_rnd_probe(device_t dev);
   54 static int      octeon_rnd_detach(device_t dev);
   55 
   56 static void     octeon_rnd_harvest(void *);
   57 
   58 static device_method_t octeon_rnd_methods[] = {
   59         /* Device interface */
   60         DEVMETHOD(device_identify,      octeon_rnd_identify),
   61         DEVMETHOD(device_probe,         octeon_rnd_probe),
   62         DEVMETHOD(device_attach,        octeon_rnd_attach),
   63         DEVMETHOD(device_detach,        octeon_rnd_detach),
   64 
   65         { 0, 0 }
   66 };
   67 
   68 static driver_t octeon_rnd_driver = {
   69         "rnd",
   70         octeon_rnd_methods,
   71         sizeof (struct octeon_rnd_softc)
   72 };
   73 static devclass_t octeon_rnd_devclass;
   74 DRIVER_MODULE(rnd, nexus, octeon_rnd_driver, octeon_rnd_devclass, 0, 0);
   75 
   76 static void
   77 octeon_rnd_identify(driver_t *drv, device_t parent)
   78 {
   79         BUS_ADD_CHILD(parent, 0, "rnd", 0);
   80 }
   81 
   82 static int
   83 octeon_rnd_probe(device_t dev)
   84 {
   85         if (device_get_unit(dev) != 0)
   86                 return (ENXIO);
   87 
   88         device_set_desc(dev, "Cavium Octeon Random Number Generator");
   89         return (BUS_PROBE_NOWILDCARD);
   90 }
   91 
   92 static int
   93 octeon_rnd_attach(device_t dev)
   94 {
   95         struct octeon_rnd_softc *sc;
   96 
   97         sc = device_get_softc(dev);
   98         callout_init(&sc->sc_callout, 1);
   99         callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
  100 
  101         cvmx_rng_enable();
  102 
  103         return (0);
  104 }
  105 
  106 static int
  107 octeon_rnd_detach(device_t dev)
  108 {
  109         struct octeon_rnd_softc *sc;
  110 
  111         sc = device_get_softc(dev);
  112 
  113         callout_stop(&sc->sc_callout);
  114 
  115         return (0);
  116 }
  117 
  118 static void
  119 octeon_rnd_harvest(void *arg)
  120 {
  121         struct octeon_rnd_softc *sc;
  122         unsigned i;
  123 
  124         sc = arg;
  125 
  126         for (i = 0; i < OCTEON_RND_WORDS; i++)
  127                 sc->sc_entropy[i] = cvmx_rng_get_random64();
  128         random_harvest(sc->sc_entropy, sizeof sc->sc_entropy,
  129                        (sizeof(sc->sc_entropy)*8)/2, RANDOM_PURE_OCTEON);
  130 
  131         callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
  132 }

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