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

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