52485bbc38
Currently, VirtIORng uses C++'s RNG. This causes nondeterminism across simulations using this device. One example is the example RISC-V board booting Ubuntu, configs/example/gem5_library/riscv-ubuntu-run.py JIRA: https://gem5.atlassian.net/browse/GEM5-1193 Change-Id: I299e72eb891819007b4260390f5c2ba94d2dec7b Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/56889 Maintainer: Bobby Bruce <bbruce@ucdavis.edu> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
/*
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* Copyright (c) 2022 Institute of Computing Technology, Chinese Academy
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* of Sciences
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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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 are
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* met: 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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* 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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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "dev/virtio/rng.hh"
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#include "base/random.hh"
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#include "debug/VIORng.hh"
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#include "params/VirtIORng.hh"
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#include "sim/system.hh"
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namespace gem5
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{
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VirtIORng::VirtIORng(const Params ¶ms)
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: VirtIODeviceBase(params, ID_RNG, 0, 0),
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qReq(params.system->physProxy, byteOrder, params.qSize, *this)
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{
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registerQueue(qReq);
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}
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VirtIORng::~VirtIORng()
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{
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}
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VirtIORng::RngQueue::RngQueue(PortProxy &proxy, ByteOrder bo, uint16_t size,
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VirtIORng &_parent)
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: VirtQueue(proxy, bo, size), parent(_parent)
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{
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}
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void
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VirtIORng::readConfig(PacketPtr pkt, Addr cfgOffset)
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{
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// There are no configuration for RNG device
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pkt->makeResponse();
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}
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void
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VirtIORng::RngQueue::trySend()
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{
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DPRINTF(VIORng, "try send\n");
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VirtDescriptor *d;
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while ((d = consumeDescriptor())) {
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DPRINTF(VIORng, "Got descriptor (len: %i)\n", d->size());
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size_t len = 0;
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while (len < d->size()) {
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uint8_t byte = gem5::random_mt.random<uint8_t>();
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d->chainWrite(len, &byte, sizeof(uint8_t));
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++len;
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}
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// Tell the guest that we are done with this descriptor.
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produceDescriptor(d, len);
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parent.kick();
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}
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}
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} // namespace gem5
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