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/*
* Copyright (c) 2012-2014 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.
*
* 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.
*/
#include "mem/external_slave.hh"
#include <cctype>
#include <iomanip>
#include "base/compiler.hh"
#include "base/trace.hh"
#include "debug/ExternalPort.hh"
namespace gem5
{
/** Implement a `stub' port which just responds to requests by printing
* a message. The stub port can be used to configure and test a system
* where the external port is used for a peripheral before connecting
* the external port */
class StubSlavePort : public ExternalSlave::ExternalPort
{
public:
void processResponseEvent();
EventFunctionWrapper responseEvent;
/** Stub can handle a single request at a time. This will be
* NULL when no packet is in flight */
PacketPtr responsePacket;
/** Received a new request while processing a first. Need to ask for
* a retry after completing this packet */
bool mustRetry;
StubSlavePort(const std::string &name_,
ExternalSlave &owner_) :
ExternalSlave::ExternalPort(name_, owner_),
responseEvent([this]{ processResponseEvent(); }, name()),
responsePacket(NULL), mustRetry(false)
{ }
Tick recvAtomic(PacketPtr packet);
void recvFunctional(PacketPtr packet);
bool recvTimingReq(PacketPtr packet);
bool recvTimingSnoopResp(PacketPtr packet);
void recvRespRetry();
void recvFunctionalSnoop(PacketPtr packet);
};
class StubSlavePortHandler : public
ExternalSlave::Handler
{
public:
ExternalSlave::ExternalPort *getExternalPort(
const std::string &name_,
ExternalSlave &owner,
const std::string &port_data)
{
StringWrap name(name_);
DPRINTF(ExternalPort, "finding stub port '%s'\n", port_data);
return new StubSlavePort(name_, owner);
}
};
Tick
StubSlavePort::recvAtomic(PacketPtr packet)
{
if (debug::ExternalPort) {
[[maybe_unused]] unsigned int size = packet->getSize();
DPRINTF(ExternalPort, "StubSlavePort: recvAtomic a: 0x%x size: %d"
" data: ...\n", packet->getAddr(), size);
DDUMP(ExternalPort, packet->getConstPtr<uint8_t>(), size);
}
return 0;
}
void
StubSlavePort::recvFunctional(PacketPtr packet)
{
recvAtomic(packet);
}
void
StubSlavePort::processResponseEvent()
{
responsePacket->makeResponse();
responsePacket->headerDelay = 0;
responsePacket->payloadDelay = 0;
if (sendTimingResp(responsePacket)) {
responsePacket = NULL;
if (mustRetry)
sendRetryReq();
mustRetry = false;
}
}
bool
StubSlavePort::recvTimingReq(PacketPtr packet)
{
if (responsePacket) {
mustRetry = true;
return false;
} else {
recvAtomic(packet);
responsePacket = packet;
owner.schedule(responseEvent, curTick());
return true;
}
}
bool
StubSlavePort::recvTimingSnoopResp(PacketPtr packet)
{
fatal("StubSlavePort: function: %s\n", __func__);
return false;
}
void
StubSlavePort::recvRespRetry()
{
assert(responsePacket);
/* Stub handles only one response at a time so responseEvent should never
* be scheduled at this point. Retrys shouldn't need to schedule, we
* can safely send the response here */
responseEvent.process();
}
void
StubSlavePort::recvFunctionalSnoop(PacketPtr packet)
{
fatal("StubSlavePort: unimplemented function: %s\n", __func__);
}
std::map<std::string, ExternalSlave::Handler *>
ExternalSlave::portHandlers;
AddrRangeList
ExternalSlave::ExternalPort::getAddrRanges() const
{
return owner.addrRanges;
}
ExternalSlave::ExternalSlave(const ExternalSlaveParams &params) :
SimObject(params),
externalPort(NULL),
portName(params.name + ".port"),
portType(params.port_type),
portData(params.port_data),
addrRanges(params.addr_ranges.begin(), params.addr_ranges.end())
{
/* Register the stub handler if it hasn't already been registered */
if (portHandlers.find("stub") == portHandlers.end())
registerHandler("stub", new StubSlavePortHandler);
}
Port &
ExternalSlave::getPort(const std::string &if_name, PortID idx)
{
if (if_name == "port") {
DPRINTF(ExternalPort, "Trying to bind external port: %s %s\n",
portType, portName);
if (!externalPort) {
auto handlerIter = portHandlers.find(portType);
if (handlerIter == portHandlers.end())
fatal("Can't find port handler type '%s'\n", portType);
externalPort = portHandlers[portType]->getExternalPort(portName,
*this, portData);
if (!externalPort) {
fatal("%s: Can't find external port type: %s"
" port_data: '%s'\n", portName, portType, portData);
}
}
return *externalPort;
} else {
return SimObject::getPort(if_name, idx);
}
}
void
ExternalSlave::init()
{
if (!externalPort) {
fatal("ExternalSlave %s: externalPort not set!\n", name());
} else if (!externalPort->isConnected()) {
fatal("ExternalSlave %s is unconnected!\n", name());
} else {
externalPort->sendRangeChange();
}
}
void
ExternalSlave::registerHandler(const std::string &handler_name,
Handler *handler)
{
portHandlers[handler_name] = handler;
}
} // namespace gem5