external_master.hh revision 11817
1/* 2 * Copyright (c) 2012-2014 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer; 18 * redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution; 21 * neither the name of the copyright holders nor the names of its 22 * contributors may be used to endorse or promote products derived from 23 * this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Andrew Bardsley 38 * Curtis Dunham 39 * Christian Menard 40 */ 41 42/** 43 * @file 44 * 45 * ExternalMaster is a memory object representing a binding from 46 * a gem5 slave to a master port in a system external to gem5. 47 * 48 * During initialisation, a `handler' for the port type specified in the 49 * port's port_type parameter is found from the registered port handlers 50 * provided with registerHandler. Once a handler is found, it is passed the 51 * port_data parameter of the port which can be used to identify the external 52 * port which is to be bound to. A port handler will usually construct a 53 * bridge object in the external system to accomodate the port-to-port 54 * mapping but this bridge is not exposed to gem5 other than be the 55 * presentation of the MasterPort which can be bound. 56 * 57 * The external port must provide a gem5 MasterPort interface. 58 */ 59 60#ifndef __MEM_EXTERNAL_MASTER__ 61#define __MEM_EXTERNAL_MASTER__ 62 63#include "mem/mem_object.hh" 64#include "params/ExternalMaster.hh" 65 66class ExternalMaster : public MemObject 67{ 68 public: 69 /** Derive from this class to create an external port interface */ 70 class Port : public MasterPort 71 { 72 protected: 73 ExternalMaster &owner; 74 75 public: 76 Port(const std::string &name_, 77 ExternalMaster &owner_) : 78 MasterPort(name_, &owner_), owner(owner_) 79 { } 80 81 ~Port() { } 82 83 /** Any or all of recv... can be overloaded to provide the port's 84 * functionality */ 85 }; 86 87 /* Handlers are specific to *types* of port not specific port 88 * instantiations. A handler will typically build a bridge to the 89 * external port from gem5 and provide gem5 with a MasterPort that can be 90 * bound to for each call to Handler::getExternalPort.*/ 91 class Handler 92 { 93 public: 94 /** Create or find an external port which can be bound. Returns 95 * NULL on failure */ 96 virtual Port *getExternalPort( 97 const std::string &name, ExternalMaster &owner, 98 const std::string &port_data) = 0; 99 }; 100 101 protected: 102 /** The peer port for the gem5 port "port" */ 103 Port *externalPort; 104 105 /** Name of the bound port. This will be name() + ".port" */ 106 std::string portName; 107 108 /** Key to select a port handler */ 109 std::string portType; 110 111 /** Handler-specific port configuration */ 112 std::string portData; 113 114 /** Registered handlers. Handlers are chosen using the port_type 115 * parameter on ExternalMasters. port_types form a global namespace 116 * across the simulation and so handlers are registered into a global 117 * structure */ 118 static std::map<std::string, Handler *> portHandlers; 119 120 public: 121 ExternalMaster(ExternalMasterParams *params); 122 123 /** MasterPort interface. Responds only to port "port" */ 124 BaseMasterPort &getMasterPort(const std::string &if_name, 125 PortID idx = InvalidPortID); 126 127 /** Register a handler which can provide ports with port_type == 128 * handler_name */ 129 static void registerHandler(const std::string &handler_name, 130 Handler *handler); 131 132 void init(); 133 134 const MasterID masterId; 135}; 136 137 138#endif // __MEM_EXTERNAL_MASTER__ 139