noncoherent_xbar.hh revision 2568
1/* 2 * Copyright (c) 2002-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29/** 30 * @file Decleration of a bus object. 31 */ 32 33#ifndef __MEM_BUS_HH__ 34#define __MEM_BUS_HH__ 35 36#include <string> 37#include <list> 38#include <inttypes.h> 39 40#include "base/range.hh" 41#include "mem/mem_object.hh" 42#include "mem/packet.hh" 43#include "mem/port.hh" 44#include "mem/request.hh" 45 46class Bus : public MemObject 47{ 48 /** a globally unique id for this bus. */ 49 int busId; 50 51 struct DevMap { 52 int portId; 53 Range<Addr> range; 54 }; 55 std::vector<DevMap> portList; 56 57 58 /** Function called by the port when the bus is recieving a Timing 59 transaction.*/ 60 bool recvTiming(Packet &pkt, int id); 61 62 /** Function called by the port when the bus is recieving a Atomic 63 transaction.*/ 64 Tick recvAtomic(Packet &pkt, int id); 65 66 /** Function called by the port when the bus is recieving a Functional 67 transaction.*/ 68 void recvFunctional(Packet &pkt, int id); 69 70 /** Function called by the port when the bus is recieving a status change.*/ 71 void recvStatusChange(Port::Status status, int id); 72 73 /** Find which port connected to this bus (if any) should be given a packet 74 * with this address. 75 * @param addr Address to find port for. 76 * @param id Id of the port this packet was received from (to prevent 77 * loops) 78 * @return pointer to port that the packet should be sent out of. 79 */ 80 Port * 81 Bus::findPort(Addr addr, int id); 82 83 /** Process address range request. 84 * @param resp addresses that we can respond to 85 * @param snoop addresses that we would like to snoop 86 * @param id ide of the busport that made the request. 87 */ 88 void addressRanges(AddrRangeList &resp, AddrRangeList &snoop, int id); 89 90 91 /** Decleration of the buses port type, one will be instantiated for each 92 of the interfaces connecting to the bus. */ 93 class BusPort : public Port 94 { 95 /** A pointer to the bus to which this port belongs. */ 96 Bus *bus; 97 98 /** A id to keep track of the intercafe ID this port is connected to. */ 99 int id; 100 101 public: 102 103 /** Constructor for the BusPort.*/ 104 BusPort(Bus *_bus, int _id) 105 : bus(_bus), id(_id) 106 { } 107 108 protected: 109 110 /** When reciving a timing request from the peer port (at id), 111 pass it to the bus. */ 112 virtual bool recvTiming(Packet &pkt) 113 { return bus->recvTiming(pkt, id); } 114 115 /** When reciving a Atomic requestfrom the peer port (at id), 116 pass it to the bus. */ 117 virtual Tick recvAtomic(Packet &pkt) 118 { return bus->recvAtomic(pkt, id); } 119 120 /** When reciving a Functional requestfrom the peer port (at id), 121 pass it to the bus. */ 122 virtual void recvFunctional(Packet &pkt) 123 { bus->recvFunctional(pkt, id); } 124 125 /** When reciving a status changefrom the peer port (at id), 126 pass it to the bus. */ 127 virtual void recvStatusChange(Status status) 128 { bus->recvStatusChange(status, id); } 129 130 // This should return all the 'owned' addresses that are 131 // downstream from this bus, yes? That is, the union of all 132 // the 'owned' address ranges of all the other interfaces on 133 // this bus... 134 virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop) 135 { bus->addressRanges(resp, snoop, id); } 136 137 // Hack to make translating port work without changes 138 virtual int deviceBlockSize() { return 32; } 139 140 }; 141 142 /** An array of pointers to the peer port interfaces 143 connected to this bus.*/ 144 std::vector<Port*> interfaces; 145 146 public: 147 148 /** A function used to return the port associated with this bus object. */ 149 virtual Port *getPort(const std::string &if_name) 150 { 151 // if_name ignored? forced to be empty? 152 int id = interfaces.size(); 153 interfaces.push_back(new BusPort(this, id)); 154 return interfaces.back(); 155 } 156 157 virtual void init(); 158 159 Bus(const std::string &n, int bus_id) 160 : MemObject(n), busId(bus_id) {} 161 162}; 163 164#endif //__MEM_BUS_HH__ 165