xref: /gem5/src/dev/x86/intdev.hh

/*
 * Copyright (c) 2012 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) 2008 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Gabe Black
 */

#ifndef __DEV_X86_INTDEV_HH__
#define __DEV_X86_INTDEV_HH__

#include <cassert>
#include <list>
#include <string>

#include "arch/x86/intmessage.hh"
#include "arch/x86/x86_traits.hh"
#include "mem/tport.hh"
#include "sim/sim_object.hh"

namespace X86ISA
{

template <class Device>
class IntSlavePort : public SimpleTimingPort
{
    Device * device;

  public:
    IntSlavePort(const std::string& _name, SimObject* _parent,
                 Device* dev) :
        SimpleTimingPort(_name, _parent), device(dev)
    {
    }

    AddrRangeList
    getAddrRanges() const
    {
        return device->getIntAddrRange();
    }

    Tick
    recvAtomic(PacketPtr pkt)
    {
        panic_if(pkt->cmd != MemCmd::MessageReq,
                "%s received unexpected command %s from %s.\n",
                name(), pkt->cmd.toString(), getPeer());
        pkt->headerDelay = pkt->payloadDelay = 0;
        return device->recvMessage(pkt);
    }
};

typedef std::list<int> ApicList;

template <class Device>
class IntMasterPort : public QueuedMasterPort
{
    ReqPacketQueue reqQueue;
    SnoopRespPacketQueue snoopRespQueue;

    Device* device;
    Tick latency;

  public:
    IntMasterPort(const std::string& _name, SimObject* _parent,
                  Device* dev, Tick _latency) :
        QueuedMasterPort(_name, _parent, reqQueue, snoopRespQueue),
        reqQueue(*_parent, *this), snoopRespQueue(*_parent, *this),
        device(dev), latency(_latency)
    {
    }

    bool
    recvTimingResp(PacketPtr pkt) override
    {
        return device->recvResponse(pkt);
    }

    // This is x86 focused, so if this class becomes generic, this would
    // need to be moved into a subclass.
    void
    sendMessage(X86ISA::ApicList apics, TriggerIntMessage message, bool timing)
    {
        for (auto id: apics) {
            PacketPtr pkt = buildIntRequest(id, message);
            if (timing) {
                schedTimingReq(pkt, curTick() + latency);
                // The target handles cleaning up the packet in timing mode.
            } else {
                // ignore the latency involved in the atomic transaction
                sendAtomic(pkt);
                assert(pkt->isResponse());
                // also ignore the latency in handling the response
                device->recvResponse(pkt);
            }
        }
    }
};

class IntDevice
{
  protected:

    IntMasterPort<IntDevice> intMasterPort;

  public:
    IntDevice(SimObject * parent, Tick latency = 0) :
        intMasterPort(parent->name() + ".int_master", parent, this, latency)
    {
    }

    virtual ~IntDevice()
    {}

    virtual void init();

    virtual bool
    recvResponse(PacketPtr pkt)
    {
        panic("recvResponse not implemented.\n");
    }
};

} // namespace X86ISA

#endif //__DEV_X86_INTDEV_HH__