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/*
* Copyright (c) 2012,2015,2017 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2002-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @file
* Port object definitions.
*/
#include "mem/port.hh"
#include "base/trace.hh"
#include "debug/ResponsePort.hh"
#include "sim/sim_object.hh"
namespace gem5
{
namespace
{
class DefaultRequestPort : public RequestPort
{
protected:
[[noreturn]] void
blowUp() const
{
throw UnboundPortException();
}
public:
DefaultRequestPort() : RequestPort("default_request_port") {}
// Atomic protocol.
Tick recvAtomicSnoop(PacketPtr) override { blowUp(); }
// Timing protocol.
bool recvTimingResp(PacketPtr) override { blowUp(); }
void recvTimingSnoopReq(PacketPtr) override { blowUp(); }
void recvReqRetry() override { blowUp(); }
void recvRetrySnoopResp() override { blowUp(); }
// Functional protocol.
void recvFunctionalSnoop(PacketPtr) override { blowUp(); }
};
class DefaultResponsePort : public ResponsePort
{
protected:
[[noreturn]] void
blowUp() const
{
throw UnboundPortException();
}
public:
DefaultResponsePort() : ResponsePort("default_response_port") {}
// Atomic protocol.
Tick recvAtomic(PacketPtr) override { blowUp(); }
// Timing protocol.
bool recvTimingReq(PacketPtr) override { blowUp(); }
bool tryTiming(PacketPtr) override { blowUp(); }
bool recvTimingSnoopResp(PacketPtr) override { blowUp(); }
void recvRespRetry() override { blowUp(); }
// Functional protocol.
void recvFunctional(PacketPtr) override { blowUp(); }
void
recvMemBackdoorReq(const MemBackdoorReq &, MemBackdoorPtr &) override
{
blowUp();
}
// General.
AddrRangeList getAddrRanges() const override { return AddrRangeList(); }
};
DefaultRequestPort defaultRequestPort;
DefaultResponsePort defaultResponsePort;
} // anonymous namespace
/**
* Request port
*/
[[deprecated]]
RequestPort::RequestPort(const std::string& name,
SimObject* _owner,
PortID _id):
Port(name, _id), _responsePort(&defaultResponsePort), owner{*_owner}
{
}
/*** FIXME:
* The owner reference member is going through a deprecation path. In the
* meantime, it must be initialized but no valid reference is available here.
* Using 1 instead of nullptr prevents warning upon dereference. It should be
* OK until definitive removal of owner.
*/
RequestPort::RequestPort(const std::string& name, PortID _id) :
Port(name, _id), _responsePort(&defaultResponsePort),
owner{*reinterpret_cast<SimObject*>(1)}
{
}
RequestPort::~RequestPort()
{
}
void
RequestPort::bind(Port &peer)
{
auto *response_port = dynamic_cast<ResponsePort *>(&peer);
fatal_if(!response_port, "Can't bind port %s to non-response port %s.",
name(), peer.name());
// request port keeps track of the response port
_responsePort = response_port;
Port::bind(peer);
// response port also keeps track of request port
_responsePort->responderBind(*this);
}
void
RequestPort::unbind()
{
panic_if(!isConnected(), "Can't unbind request port %s which is "
"not bound.", name());
_responsePort->responderUnbind();
_responsePort = &defaultResponsePort;
Port::unbind();
}
AddrRangeList
RequestPort::getAddrRanges() const
{
return _responsePort->getAddrRanges();
}
void
RequestPort::printAddr(Addr a)
{
auto req = std::make_shared<Request>(
a, 1, 0, Request::funcRequestorId);
Packet pkt(req, MemCmd::PrintReq);
Packet::PrintReqState prs(std::cerr);
pkt.senderState = &prs;
sendFunctional(&pkt);
}
/**
* Response port
*/
[[deprecated]]
ResponsePort::ResponsePort(const std::string& name,
SimObject* _owner,
PortID _id):
Port(name, _id),
_requestPort(&defaultRequestPort),
defaultBackdoorWarned(false),
owner{*_owner}
{
}
/*** FIXME:
* The owner reference member is going through a deprecation path. In the
* meantime, it must be initialized but no valid reference is available here.
* Using 1 instead of nullptr prevents warning upon dereference. It should be
* OK until definitive removal of owner.
*/
ResponsePort::ResponsePort(const std::string& name, PortID id) :
Port(name, id),
_requestPort(&defaultRequestPort),
defaultBackdoorWarned(false),
owner{*reinterpret_cast<SimObject*>(1)}
{
}
ResponsePort::~ResponsePort()
{
}
void
ResponsePort::responderUnbind()
{
_requestPort = &defaultRequestPort;
Port::unbind();
}
void
ResponsePort::responderBind(RequestPort& request_port)
{
_requestPort = &request_port;
Port::bind(request_port);
}
Tick
ResponsePort::recvAtomicBackdoor(PacketPtr pkt, MemBackdoorPtr &backdoor)
{
if (!defaultBackdoorWarned) {
DPRINTF(ResponsePort,
"Port %s doesn't support requesting a back door.", name());
defaultBackdoorWarned = true;
}
return recvAtomic(pkt);
}
void
ResponsePort::recvMemBackdoorReq(const MemBackdoorReq &req,
MemBackdoorPtr &backdoor)
{
if (!defaultBackdoorWarned) {
DPRINTF(ResponsePort,
"Port %s doesn't support requesting a back door.", name());
defaultBackdoorWarned = true;
}
}
} // namespace gem5