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-/*
- * Copyright (c) 2006 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
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/**
- * @file Decleration of a simple bus bridge object with no buffering
- */
-
-#ifndef __MEM_BRIDGE_HH__
-#define __MEM_BRIDGE_HH__
-
-#include <string>
-#include <list>
-#include <inttypes.h>
-#include <queue>
-
-
-#include "mem/mem_object.hh"
-#include "mem/packet.hh"
-#include "mem/port.hh"
-#include "sim/eventq.hh"
-
-class Bridge : public MemObject
-{
- public:
- enum Side
- {
- SideA,
- SideB
- };
-
- protected:
- /** Function called by the port when the bus is recieving a Timing
- transaction.*/
- bool recvTiming(Packet *pkt, Side id);
-
- /** Function called by the port when the bus is recieving a Atomic
- transaction.*/
- Tick recvAtomic(Packet *pkt, Side id);
-
- /** Function called by the port when the bus is recieving a Functional
- transaction.*/
- void recvFunctional(Packet *pkt, Side id);
-
- /** Function called by the port when the bus is recieving a status change.*/
- void recvStatusChange(Port::Status status, Side id);
-
- /** Process address range request.
- * @param resp addresses that we can respond to
- * @param snoop addresses that we would like to snoop
- * @param id ide of the busport that made the request.
- */
- void addressRanges(AddrRangeList &resp, AddrRangeList &snoop, Side id);
-
-
- /** Event that the SendEvent calls when it fires. This code must reschedule
- * the send event as required. */
- void timerEvent();
-
- /** Decleration of the buses port type, one will be instantiated for each
- of the interfaces connecting to the bus. */
- class BridgePort : public Port
- {
- /** A pointer to the bus to which this port belongs. */
- Bridge *bridge;
-
- /** A id to keep track of the intercafe ID this port is connected to. */
- Bridge::Side side;
-
- public:
-
- /** Constructor for the BusPort.*/
- BridgePort(Bridge *_bridge, Side _side)
- : bridge(_bridge), side(_side)
- { }
-
- int numQueued() { return outbound.size(); }
-
- protected:
- /** Data this is waiting to be transmitted. */
- std::list<std::pair<Packet*, Tick> > outbound;
-
- void sendPkt(Packet *pkt);
- void sendPkt(std::pair<Packet*, Tick> p);
-
- /** When reciving a timing request from the peer port,
- pass it to the bridge. */
- virtual bool recvTiming(Packet *pkt)
- { return bridge->recvTiming(pkt, side); }
-
- /** When reciving a retry request from the peer port,
- pass it to the bridge. */
- virtual Packet* recvRetry();
-
- /** When reciving a Atomic requestfrom the peer port,
- pass it to the bridge. */
- virtual Tick recvAtomic(Packet *pkt)
- { return bridge->recvAtomic(pkt, side); }
-
- /** When reciving a Functional request from the peer port,
- pass it to the bridge. */
- virtual void recvFunctional(Packet *pkt)
- { bridge->recvFunctional(pkt, side); }
-
- /** When reciving a status changefrom the peer port,
- pass it to the bridge. */
- virtual void recvStatusChange(Status status)
- { bridge->recvStatusChange(status, side); }
-
- /** When reciving a address range request the peer port,
- pass it to the bridge. */
- virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
- { bridge->addressRanges(resp, snoop, side); }
-
- friend class Bridge;
- };
-
- class SendEvent : public Event
- {
- Bridge *bridge;
-
- SendEvent(Bridge *b)
- : Event(&mainEventQueue), bridge(b) {}
-
- virtual void process() { bridge->timerEvent(); }
-
- virtual const char *description() { return "bridge delay event"; }
- friend class Bridge;
- };
-
- SendEvent sendEvent;
-
- /** Sides of the bus bridges. */
- BridgePort* sideA;
- BridgePort* sideB;
-
- /** inbound queues on both sides. */
- std::list<std::pair<Packet*, Tick> > inboundA;
- std::list<std::pair<Packet*, Tick> > inboundB;
-
- /** The size of the queue for data coming into side a */
- int queueSizeA;
- int queueSizeB;
-
- /* if the side is blocked or not. */
- bool blockedA;
- bool blockedB;
-
- /** Miminum delay though this bridge. */
- Tick delay;
-
- /** If this bridge should acknowledge writes. */
- bool ackWrites;
-
- public:
-
- /** A function used to return the port associated with this bus object. */
- virtual Port *getPort(const std::string &if_name)
- {
- if (if_name == "side_a") {
- if (sideA != NULL)
- panic("bridge side a already connected to.");
- sideA = new BridgePort(this, SideA);
- return sideA;
- } else if (if_name == "side_b") {
- if (sideB != NULL)
- panic("bridge side b already connected to.");
- sideB = new BridgePort(this, SideB);
- return sideB;
- } else
- return NULL;
- }
-
- virtual void init();
-
- Bridge(const std::string &n, int qsa, int qsb, Tick _delay, int write_ack)
- : MemObject(n), sendEvent(this), sideA(NULL), sideB(NULL),
- queueSizeA(qsa), queueSizeB(qsb), blockedA(false), blockedB(false),
- delay(_delay), ackWrites(write_ack)
- {}
-
- /** Check if the port should block/unblock after recieving/sending a packet.
- * */
- void blockCheck(Side id);
-
- friend class Bridge::SendEvent;
-
-};
-
-#endif //__MEM_BUS_HH__
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