9ad74b7d0c
The only part of the MaserPort the PortProxy uses is the sendFunctional function which is part of the functional protocol. Rather than require a MasterPort which comes along with a lot of other mechanisms, this change slightly adjusts the PortProxy to only require that function through the use of a delegate. That allows lots of flexibility in how the actual packet gets sent and what sends it. In cases where code constructs a PortProxy and passes its constructor an unbound MasterPort, the PortProxy will create a delegate to the sendFunctional method on its own. This should also make it easier for objects which don't have traditional gem5 style ports, for instance systemc models, to implement just the little bit of the protocol they need, rather than having to stub out a whole port class, most of which will be ignored. Change-Id: I234b42ce050f12313b551a61736186ddf2c9e2c7 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/20229 Maintainer: Gabe Black <gabeblack@google.com> Reviewed-by: Gabe Black <gabeblack@google.com> Tested-by: kokoro <noreply+kokoro@google.com>
128 lines
4.2 KiB
C++
128 lines
4.2 KiB
C++
/*
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* Copyright (c) 2012, 2018 ARM Limited
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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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* Authors: Andreas Hansson
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*/
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#include "mem/port_proxy.hh"
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#include "base/chunk_generator.hh"
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void
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PortProxy::readBlobPhys(Addr addr, Request::Flags flags,
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void *p, int size) const
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{
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for (ChunkGenerator gen(addr, size, _cacheLineSize); !gen.done();
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gen.next()) {
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auto req = std::make_shared<Request>(
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gen.addr(), gen.size(), flags, Request::funcMasterId);
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Packet pkt(req, MemCmd::ReadReq);
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pkt.dataStatic(static_cast<uint8_t *>(p));
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sendFunctional(&pkt);
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p = static_cast<uint8_t *>(p) + gen.size();
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}
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}
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void
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PortProxy::writeBlobPhys(Addr addr, Request::Flags flags,
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const void *p, int size) const
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{
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for (ChunkGenerator gen(addr, size, _cacheLineSize); !gen.done();
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gen.next()) {
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auto req = std::make_shared<Request>(
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gen.addr(), gen.size(), flags, Request::funcMasterId);
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Packet pkt(req, MemCmd::WriteReq);
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pkt.dataStaticConst(static_cast<const uint8_t *>(p));
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sendFunctional(&pkt);
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p = static_cast<const uint8_t *>(p) + gen.size();
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}
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}
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void
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PortProxy::memsetBlobPhys(Addr addr, Request::Flags flags,
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uint8_t v, int size) const
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{
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// quick and dirty...
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uint8_t *buf = new uint8_t[size];
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std::memset(buf, v, size);
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PortProxy::writeBlobPhys(addr, flags, buf, size);
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delete [] buf;
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}
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bool
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PortProxy::tryWriteString(Addr addr, const char *str) const
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{
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do {
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if (!tryWriteBlob(addr++, str, 1))
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return false;
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} while (*str++);
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return true;
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}
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bool
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PortProxy::tryReadString(std::string &str, Addr addr) const
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{
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while (true) {
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uint8_t c;
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if (!tryReadBlob(addr++, &c, 1))
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return false;
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if (!c)
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return true;
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str += c;
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}
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}
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bool
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PortProxy::tryReadString(char *str, Addr addr, size_t maxlen) const
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{
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assert(maxlen);
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while (maxlen--) {
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if (!tryReadBlob(addr++, str, 1))
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return false;
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if (!*str++)
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return true;
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}
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// We ran out of room, so back up and add a terminator.
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*--str = '\0';
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return true;
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}
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