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diff --git a/src/mem/external_slave.cc b/src/mem/external_slave.cc
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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.
+ *
+ * Authors: Andrew Bardsley
+ */
+
+#include <cctype>
+#include <iomanip>
+
+#include "debug/ExternalPort.hh"
+#include "mem/external_slave.hh"
+
+/** 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::Port
+{
+ public:
+ class ResponseEvent : public Event
+ {
+ public:
+ StubSlavePort &owner;
+
+ ResponseEvent(StubSlavePort &owner_) : owner(owner_) { }
+
+ void process();
+ };
+
+ ResponseEvent 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::Port(name_, owner_),
+ responseEvent(*this), responsePacket(NULL)
+ { }
+
+ Tick recvAtomic(PacketPtr packet);
+ void recvFunctional(PacketPtr packet);
+ bool recvTimingReq(PacketPtr packet);
+ bool recvTimingSnoopResp(PacketPtr packet);
+ void recvRetry();
+ void recvFunctionalSnoop(PacketPtr packet);
+};
+
+class StubSlavePortHandler : public
+ ExternalSlave::Handler
+{
+ public:
+ ExternalSlave::Port *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 (DTRACE(ExternalPort)) {
+ unsigned int M5_VAR_USED size = packet->getSize();
+
+ DPRINTF(ExternalPort, "StubSlavePort: recvAtomic a: 0x%x size: %d"
+ " data: ...\n", packet->getAddr(), size);
+ DDUMP(ExternalPort, packet->getPtr<uint8_t>(), size);
+ }
+
+ return 0;
+}
+
+void
+StubSlavePort::recvFunctional(PacketPtr packet)
+{
+ recvAtomic(packet);
+}
+
+void
+StubSlavePort::ResponseEvent::process()
+{
+ owner.responsePacket->makeResponse();
+ owner.responsePacket->firstWordDelay = 0;
+ owner.responsePacket->lastWordDelay = 0;
+
+ if (owner.sendTimingResp(owner.responsePacket)) {
+ owner.responsePacket = NULL;
+
+ if (owner.mustRetry)
+ owner.sendRetry();
+ owner.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::recvRetry()
+{
+ 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::Port::getAddrRanges() const
+{
+ return owner.addrRanges;
+}
+
+ExternalSlave::ExternalSlave(ExternalSlaveParams *params) :
+ MemObject(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);
+}
+
+BaseSlavePort &
+ExternalSlave::getSlavePort(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 MemObject::getSlavePort(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();
+ }
+}
+
+ExternalSlave *
+ExternalSlaveParams::create()
+{
+ return new ExternalSlave(this);
+}
+
+void
+ExternalSlave::registerHandler(const std::string &handler_name,
+ Handler *handler)
+{
+ portHandlers[handler_name] = handler;
+}