2006-01-31 18:12:49 +01:00
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/*
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2012-01-17 19:55:09 +01:00
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* Copyright (c) 2011 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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2006-01-31 18:12:49 +01:00
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* Copyright (c) 2002-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2006-06-01 01:26:56 +02:00
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*
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* Authors: Ron Dreslinski
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2006-06-18 00:40:40 +02:00
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* Ali Saidi
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2012-01-17 19:55:09 +01:00
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* Andreas Hansson
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2006-01-31 18:12:49 +01:00
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*/
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/**
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2006-08-15 01:25:07 +02:00
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* @file
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* Declaration of a bus object.
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2006-01-31 18:12:49 +01:00
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*/
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#ifndef __MEM_BUS_HH__
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#define __MEM_BUS_HH__
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#include <list>
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2011-04-15 19:44:06 +02:00
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#include <set>
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#include <string>
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2006-01-31 18:12:49 +01:00
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2007-03-09 00:57:15 +01:00
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#include "base/hashmap.hh"
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2009-05-17 23:34:52 +02:00
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#include "base/range.hh"
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2006-12-15 07:49:41 +01:00
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#include "base/range_map.hh"
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2009-05-17 23:34:51 +02:00
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#include "base/types.hh"
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2006-01-31 18:12:49 +01:00
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#include "mem/mem_object.hh"
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#include "mem/packet.hh"
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2006-01-31 20:15:33 +01:00
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#include "mem/port.hh"
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#include "mem/request.hh"
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2007-08-30 21:16:59 +02:00
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#include "params/Bus.hh"
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2009-05-17 23:34:52 +02:00
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#include "sim/eventq.hh"
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2006-01-31 18:12:49 +01:00
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class Bus : public MemObject
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{
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2006-08-15 01:25:07 +02:00
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/** Declaration of the buses port type, one will be instantiated for each
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2006-01-31 18:12:49 +01:00
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of the interfaces connecting to the bus. */
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class BusPort : public Port
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{
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/** A pointer to the bus to which this port belongs. */
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Bus *bus;
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/** A id to keep track of the intercafe ID this port is connected to. */
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int id;
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public:
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/** Constructor for the BusPort.*/
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2006-05-26 19:48:35 +02:00
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BusPort(const std::string &_name, Bus *_bus, int _id)
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2012-02-09 19:06:27 +01:00
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: Port(_name, _bus), bus(_bus), id(_id)
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2006-01-31 18:12:49 +01:00
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{ }
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2012-01-17 19:55:09 +01:00
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int getId() const { return id; }
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2007-02-07 06:53:05 +01:00
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2012-01-17 19:55:09 +01:00
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/**
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* Determine if this port should be considered a snooper. This
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* is determined by the bus.
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*
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* @return a boolean that is true if this port is snooping
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*/
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virtual bool isSnooping()
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{ return bus->isSnooping(id); }
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2006-01-31 18:12:49 +01:00
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protected:
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/** When reciving a timing request from the peer port (at id),
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pass it to the bus. */
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2006-10-20 09:10:12 +02:00
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virtual bool recvTiming(PacketPtr pkt)
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2006-05-26 20:17:33 +02:00
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{ pkt->setSrc(id); return bus->recvTiming(pkt); }
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2006-01-31 18:12:49 +01:00
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/** When reciving a Atomic requestfrom the peer port (at id),
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pass it to the bus. */
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2006-10-20 09:10:12 +02:00
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virtual Tick recvAtomic(PacketPtr pkt)
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2006-05-26 20:17:33 +02:00
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{ pkt->setSrc(id); return bus->recvAtomic(pkt); }
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2006-01-31 18:12:49 +01:00
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/** When reciving a Functional requestfrom the peer port (at id),
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pass it to the bus. */
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2006-10-20 09:10:12 +02:00
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virtual void recvFunctional(PacketPtr pkt)
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2006-05-26 20:17:33 +02:00
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{ pkt->setSrc(id); bus->recvFunctional(pkt); }
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2006-01-31 18:12:49 +01:00
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2012-01-17 19:55:09 +01:00
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/** When reciving a range change from the peer port (at id),
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2006-01-31 18:12:49 +01:00
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pass it to the bus. */
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2012-01-17 19:55:09 +01:00
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virtual void recvRangeChange()
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{ bus->recvRangeChange(id); }
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2006-01-31 18:12:49 +01:00
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2006-05-31 00:57:42 +02:00
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/** When reciving a retry from the peer port (at id),
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pass it to the bus. */
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virtual void recvRetry()
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{ bus->recvRetry(id); }
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2006-01-31 18:12:49 +01:00
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// This should return all the 'owned' addresses that are
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// downstream from this bus, yes? That is, the union of all
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// the 'owned' address ranges of all the other interfaces on
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// this bus...
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2012-01-17 19:55:09 +01:00
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virtual AddrRangeList getAddrRanges()
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{ return bus->getAddrRanges(id); }
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2006-03-26 00:31:20 +01:00
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2007-05-07 20:42:03 +02:00
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// Ask the bus to ask everyone on the bus what their block size is and
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// take the max of it. This might need to be changed a bit if we ever
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// support multiple block sizes.
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2009-06-05 08:21:12 +02:00
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virtual unsigned deviceBlockSize() const
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2007-05-07 20:42:03 +02:00
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{ return bus->findBlockSize(id); }
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2006-03-26 00:31:20 +01:00
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2006-01-31 18:12:49 +01:00
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};
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2006-10-08 20:08:58 +02:00
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class BusFreeEvent : public Event
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{
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Bus * bus;
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public:
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BusFreeEvent(Bus * _bus);
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void process();
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2008-02-06 22:32:40 +01:00
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const char *description() const;
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2006-10-08 20:08:58 +02:00
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};
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2007-05-22 08:36:09 +02:00
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/** a globally unique id for this bus. */
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int busId;
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/** the clock speed for the bus */
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int clock;
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2008-02-26 08:20:08 +01:00
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/** cycles of overhead per transaction */
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int headerCycles;
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2007-05-22 08:36:09 +02:00
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/** the width of the bus in bytes */
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int width;
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/** the next tick at which the bus will be idle */
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Tick tickNextIdle;
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Event * drainEvent;
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typedef range_map<Addr,int>::iterator PortIter;
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range_map<Addr, int> portMap;
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AddrRangeList defaultRange;
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typedef std::vector<BusPort*>::iterator SnoopIter;
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std::vector<BusPort*> snoopPorts;
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/** Function called by the port when the bus is recieving a Timing
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transaction.*/
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bool recvTiming(PacketPtr pkt);
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/** Function called by the port when the bus is recieving a Atomic
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transaction.*/
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Tick recvAtomic(PacketPtr pkt);
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/** Function called by the port when the bus is recieving a Functional
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transaction.*/
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void recvFunctional(PacketPtr pkt);
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/** Timing function called by port when it is once again able to process
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* requests. */
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void recvRetry(int id);
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2012-01-17 19:55:09 +01:00
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/** Function called by the port when the bus is recieving a range change.*/
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void recvRangeChange(int id);
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2007-05-22 08:36:09 +02:00
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/** Find which port connected to this bus (if any) should be given a packet
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* with this address.
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* @param addr Address to find port for.
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2007-07-16 05:09:03 +02:00
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* @return id of port that the packet should be sent out of.
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2007-05-22 08:36:09 +02:00
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*/
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2007-07-16 05:09:03 +02:00
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int findPort(Addr addr);
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2007-05-22 08:36:09 +02:00
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2007-08-04 22:05:55 +02:00
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// Cache for the findPort function storing recently used ports from portMap
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struct PortCache {
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bool valid;
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int id;
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Addr start;
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Addr end;
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};
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PortCache portCache[3];
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// Checks the cache and returns the id of the port that has the requested
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// address within its range
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inline int checkPortCache(Addr addr) {
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2007-08-08 20:54:02 +02:00
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if (portCache[0].valid && addr >= portCache[0].start &&
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addr < portCache[0].end) {
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return portCache[0].id;
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}
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if (portCache[1].valid && addr >= portCache[1].start &&
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addr < portCache[1].end) {
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return portCache[1].id;
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}
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if (portCache[2].valid && addr >= portCache[2].start &&
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addr < portCache[2].end) {
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return portCache[2].id;
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2007-08-04 22:05:55 +02:00
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}
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2012-02-24 17:40:29 +01:00
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return INVALID_PORT_ID;
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2007-08-04 22:05:55 +02:00
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}
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// Clears the earliest entry of the cache and inserts a new port entry
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inline void updatePortCache(short id, Addr start, Addr end) {
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portCache[2].valid = portCache[1].valid;
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portCache[2].id = portCache[1].id;
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portCache[2].start = portCache[1].start;
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portCache[2].end = portCache[1].end;
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portCache[1].valid = portCache[0].valid;
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portCache[1].id = portCache[0].id;
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portCache[1].start = portCache[0].start;
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portCache[1].end = portCache[0].end;
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portCache[0].valid = true;
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portCache[0].id = id;
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portCache[0].start = start;
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portCache[0].end = end;
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}
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// Clears the cache. Needs to be called in constructor.
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inline void clearPortCache() {
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portCache[2].valid = false;
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portCache[1].valid = false;
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portCache[0].valid = false;
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}
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2012-01-17 19:55:09 +01:00
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/**
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* Return the address ranges this port is responsible for.
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*
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* @param id id of the bus port that made the request
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*
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* @return a list of non-overlapping address ranges
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*/
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AddrRangeList getAddrRanges(int id);
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/**
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* Determine if the bus port is snooping or not.
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*
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* @param id id of the bus port that made the request
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*
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* @return a boolean indicating if this port is snooping or not
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2007-05-22 08:36:09 +02:00
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*/
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2012-01-17 19:55:09 +01:00
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bool isSnooping(int id);
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2007-05-22 08:36:09 +02:00
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2008-03-17 08:07:38 +01:00
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/** Calculate the timing parameters for the packet. Updates the
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* firstWordTime and finishTime fields of the packet object.
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* Returns the tick at which the packet header is completed (which
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* will be all that is sent if the target rejects the packet).
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2008-02-26 08:20:08 +01:00
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*/
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2008-03-17 08:07:38 +01:00
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Tick calcPacketTiming(PacketPtr pkt);
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2008-02-26 08:20:08 +01:00
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/** Occupy the bus until until */
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void occupyBus(Tick until);
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2007-05-22 08:36:09 +02:00
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/** Ask everyone on the bus what their size is
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* @param id id of the busport that made the request
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* @return the max of all the sizes
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*/
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2009-06-05 08:21:12 +02:00
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unsigned findBlockSize(int id);
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2007-05-22 08:36:09 +02:00
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2006-10-08 20:08:58 +02:00
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BusFreeEvent busIdle;
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2006-10-10 23:24:03 +02:00
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bool inRetry;
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2012-01-17 19:55:09 +01:00
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std::set<int> inRecvRangeChange;
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2006-10-08 20:08:58 +02:00
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2012-01-17 19:55:09 +01:00
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/** An ordered vector of pointers to the peer port interfaces
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2006-01-31 18:12:49 +01:00
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connected to this bus.*/
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2012-01-17 19:55:09 +01:00
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std::vector<BusPort*> interfaces;
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2006-01-31 18:12:49 +01:00
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2006-05-31 00:57:42 +02:00
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/** An array of pointers to ports that retry should be called on because the
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* original send failed for whatever reason.*/
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2012-02-09 19:06:27 +01:00
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std::list<Port*> retryList;
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2006-05-31 00:57:42 +02:00
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2012-02-09 19:06:27 +01:00
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void addToRetryList(Port* port)
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2006-10-08 20:08:58 +02:00
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{
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2006-10-10 23:24:03 +02:00
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if (!inRetry) {
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2012-02-09 19:06:27 +01:00
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// The device wasn't retrying a packet, or wasn't at an
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// appropriate time.
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2006-10-08 20:08:58 +02:00
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retryList.push_back(port);
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} else {
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2012-02-09 19:06:27 +01:00
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if (!retryList.empty() && port == retryList.front()) {
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// The device was retrying a packet. It didn't work,
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// so we'll leave it at the head of the retry list.
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2006-10-12 01:25:48 +02:00
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inRetry = false;
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2012-02-09 19:06:27 +01:00
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} else {
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// We are in retry, but not for this port, put it at
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// the end.
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2006-10-12 01:25:48 +02:00
|
|
|
retryList.push_back(port);
|
|
|
|
}
|
2006-10-08 20:08:58 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-07-06 20:41:01 +02:00
|
|
|
/** Port that handles requests that don't match any of the interfaces.*/
|
2012-01-17 19:55:09 +01:00
|
|
|
short defaultPortId;
|
2006-07-06 20:41:01 +02:00
|
|
|
|
2012-02-24 17:40:29 +01:00
|
|
|
/** A symbolic name for a port id that denotes no port. */
|
|
|
|
static const short INVALID_PORT_ID = -1;
|
|
|
|
|
2010-08-17 14:06:21 +02:00
|
|
|
/** If true, use address range provided by default device. Any
|
|
|
|
address not handled by another port and not in default device's
|
|
|
|
range will cause a fatal error. If false, just send all
|
|
|
|
addresses not handled by another port to default device. */
|
|
|
|
bool useDefaultRange;
|
2006-11-02 21:20:37 +01:00
|
|
|
|
2009-06-05 08:21:12 +02:00
|
|
|
unsigned defaultBlockSize;
|
|
|
|
unsigned cachedBlockSize;
|
2007-05-07 20:42:03 +02:00
|
|
|
bool cachedBlockSizeValid;
|
|
|
|
|
2006-01-31 18:12:49 +01:00
|
|
|
public:
|
|
|
|
|
|
|
|
/** A function used to return the port associated with this bus object. */
|
2006-06-14 05:19:28 +02:00
|
|
|
virtual Port *getPort(const std::string &if_name, int idx = -1);
|
2006-04-28 21:37:48 +02:00
|
|
|
|
|
|
|
virtual void init();
|
2007-06-10 08:01:47 +02:00
|
|
|
virtual void startup();
|
2006-04-28 21:37:48 +02:00
|
|
|
|
2006-11-02 01:00:49 +01:00
|
|
|
unsigned int drain(Event *de);
|
|
|
|
|
2010-08-17 14:06:21 +02:00
|
|
|
Bus(const BusParams *p);
|
2006-01-31 18:12:49 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
#endif //__MEM_BUS_HH__
|