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: stable/12/sys/mips/cavium/octeon_rnd.c 338324 2018-08-26 12:51:46Z markm $
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: stable/12/sys/mips/cavium/octeon_rnd.c 338324 2018-08-26 12:51:46Z markm $");
   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 
   67         { 0, 0 }
   68 };
   69 
   70 static driver_t octeon_rnd_driver = {
   71         "rnd",
   72         octeon_rnd_methods,
   73         sizeof (struct octeon_rnd_softc)
   74 };
   75 static devclass_t octeon_rnd_devclass;
   76 DRIVER_MODULE(rnd, nexus, octeon_rnd_driver, octeon_rnd_devclass, 0, 0);
   77 
   78 static void
   79 octeon_rnd_identify(driver_t *drv, device_t parent)
   80 {
   81         BUS_ADD_CHILD(parent, 0, "rnd", 0);
   82 }
   83 
   84 static int
   85 octeon_rnd_probe(device_t dev)
   86 {
   87         if (device_get_unit(dev) != 0)
   88                 return (ENXIO);
   89 
   90         device_set_desc(dev, "Cavium Octeon Random Number Generator");
   91         return (BUS_PROBE_NOWILDCARD);
   92 }
   93 
   94 static int
   95 octeon_rnd_attach(device_t dev)
   96 {
   97         struct octeon_rnd_softc *sc;
   98 
   99         sc = device_get_softc(dev);
  100         callout_init(&sc->sc_callout, 1);
  101         callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
  102 
  103         cvmx_rng_enable();
  104 
  105         return (0);
  106 }
  107 
  108 static int
  109 octeon_rnd_detach(device_t dev)
  110 {
  111         struct octeon_rnd_softc *sc;
  112 
  113         sc = device_get_softc(dev);
  114 
  115         callout_stop(&sc->sc_callout);
  116 
  117         return (0);
  118 }
  119 
  120 static void
  121 octeon_rnd_harvest(void *arg)
  122 {
  123         struct octeon_rnd_softc *sc;
  124         unsigned i;
  125 
  126         sc = arg;
  127 
  128         for (i = 0; i < OCTEON_RND_WORDS; i++)
  129                 sc->sc_entropy[i] = cvmx_rng_get_random64();
  130         /* MarkM: FIX!! Check that this does not swamp the harvester! */
  131         random_harvest_queue(sc->sc_entropy, sizeof sc->sc_entropy, RANDOM_PURE_OCTEON);
  132 
  133         callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
  134 }

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