19d3b47b92
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2010 Juli Mallett <jmallett@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/clock.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/random.h>
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#include <contrib/octeon-sdk/cvmx.h>
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#include <contrib/octeon-sdk/cvmx-rng.h>
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#define OCTEON_RND_WORDS 2
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struct octeon_rnd_softc {
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uint64_t sc_entropy[OCTEON_RND_WORDS];
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struct callout sc_callout;
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};
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static void octeon_rnd_identify(driver_t *drv, device_t parent);
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static int octeon_rnd_attach(device_t dev);
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static int octeon_rnd_probe(device_t dev);
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static int octeon_rnd_detach(device_t dev);
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static void octeon_rnd_harvest(void *);
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static device_method_t octeon_rnd_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, octeon_rnd_identify),
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DEVMETHOD(device_probe, octeon_rnd_probe),
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DEVMETHOD(device_attach, octeon_rnd_attach),
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DEVMETHOD(device_detach, octeon_rnd_detach),
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{ 0, 0 }
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};
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static driver_t octeon_rnd_driver = {
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"rnd",
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octeon_rnd_methods,
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sizeof (struct octeon_rnd_softc)
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};
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static devclass_t octeon_rnd_devclass;
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DRIVER_MODULE(rnd, nexus, octeon_rnd_driver, octeon_rnd_devclass, 0, 0);
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static void
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octeon_rnd_identify(driver_t *drv, device_t parent)
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{
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BUS_ADD_CHILD(parent, 0, "rnd", 0);
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}
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static int
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octeon_rnd_probe(device_t dev)
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{
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if (device_get_unit(dev) != 0)
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return (ENXIO);
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device_set_desc(dev, "Cavium Octeon Random Number Generator");
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return (BUS_PROBE_NOWILDCARD);
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}
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static int
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octeon_rnd_attach(device_t dev)
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{
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struct octeon_rnd_softc *sc;
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sc = device_get_softc(dev);
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callout_init(&sc->sc_callout, 1);
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callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
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cvmx_rng_enable();
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return (0);
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}
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static int
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octeon_rnd_detach(device_t dev)
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{
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struct octeon_rnd_softc *sc;
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sc = device_get_softc(dev);
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callout_stop(&sc->sc_callout);
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return (0);
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}
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static void
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octeon_rnd_harvest(void *arg)
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{
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struct octeon_rnd_softc *sc;
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unsigned i;
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sc = arg;
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for (i = 0; i < OCTEON_RND_WORDS; i++)
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sc->sc_entropy[i] = cvmx_rng_get_random64();
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/* MarkM: FIX!! Check that this does not swamp the harvester! */
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random_harvest_queue(sc->sc_entropy, sizeof sc->sc_entropy,
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(sizeof(sc->sc_entropy)*8)/2, RANDOM_PURE_OCTEON);
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callout_reset(&sc->sc_callout, hz * 5, octeon_rnd_harvest, sc);
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}
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