external_master.hh

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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
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Andrew Bardsley
 *          Curtis Dunham
 *          Christian Menard
 */

#ifndef __MEM_EXTERNAL_MASTER__
#define __MEM_EXTERNAL_MASTER__

#include "mem/mem_object.hh"
#include "params/ExternalMaster.hh"

class ExternalMaster : public MemObject
{
  public:
    class Port : public MasterPort
    {
      protected:
        ExternalMaster &owner;

      public:
        Port(const std::string &name_,
            ExternalMaster &owner_) :
            MasterPort(name_, &owner_), owner(owner_)
        { }

        ~Port() { }

    };

    /* Handlers are specific to *types* of port not specific port
     * instantiations.  A handler will typically build a bridge to the
     * external port from gem5 and provide gem5 with a MasterPort that can be
     * bound to for each call to Handler::getExternalPort.*/
    class Handler
    {
      public:
        virtual Port *getExternalPort(
            const std::string &name, ExternalMaster &owner,
            const std::string &port_data) = 0;
    };

  protected:
    Port *externalPort;

    std::string portName;

    std::string portType;

    std::string portData;

    static std::map<std::string, Handler *> portHandlers;

  public:
    ExternalMaster(ExternalMasterParams *params);

    BaseMasterPort &getMasterPort(const std::string &if_name,
        PortID idx = InvalidPortID);

    static void registerHandler(const std::string &handler_name,
        Handler *handler);

    void init();

    const MasterID masterId;
};


#endif // __MEM_EXTERNAL_MASTER__