2006-06-28 17:02:14 +02:00
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/*
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* Copyright (c) 2003-2005 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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*
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* Authors: Erik Hallnor
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*/
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/** @file
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* Declaration of a structure to manage MSHRs.
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*/
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2007-06-18 02:27:53 +02:00
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#ifndef __MEM__CACHE__MISS__MSHR_QUEUE_HH__
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#define __MEM__CACHE__MISS__MSHR_QUEUE_HH__
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#include <vector>
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2007-06-18 02:27:53 +02:00
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2008-02-10 23:45:25 +01:00
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#include "mem/cache/mshr.hh"
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2011-04-15 19:44:06 +02:00
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#include "mem/packet.hh"
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2006-06-28 17:02:14 +02:00
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/**
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2006-10-23 05:38:34 +02:00
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* A Class for maintaining a list of pending and allocated memory requests.
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2006-06-28 17:02:14 +02:00
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*/
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2007-06-18 02:27:53 +02:00
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class MSHRQueue
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{
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private:
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2008-01-02 21:20:15 +01:00
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/** Local label (for functional print requests) */
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const std::string label;
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2006-06-28 17:02:14 +02:00
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/** MSHR storage. */
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MSHR *registers;
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/** Holds pointers to all allocated entries. */
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2006-06-28 17:02:14 +02:00
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MSHR::List allocatedList;
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2007-06-18 02:27:53 +02:00
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/** Holds pointers to entries that haven't been sent to the bus. */
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MSHR::List readyList;
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/** Holds non allocated entries. */
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MSHR::List freeList;
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// Parameters
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/**
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* The total number of entries in this queue. This number is set as the
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* number of entries requested plus (numReserve - 1). This allows for
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* the same number of effective entries while still maintaining the reserve.
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*/
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const int numEntries;
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/**
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* The number of entries to hold in reserve. This is needed because copy
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* operations can allocate upto 4 entries at one time.
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*/
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const int numReserve;
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MSHR::Iterator addToReadyList(MSHR *mshr);
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public:
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/** The number of allocated entries. */
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int allocated;
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/** The number of entries that have been forwarded to the bus. */
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int inServiceEntries;
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2007-06-21 20:59:17 +02:00
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/** The index of this queue within the cache (MSHR queue vs. write
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* buffer). */
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const int index;
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/**
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* Create a queue with a given number of entries.
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* @param num_entrys The number of entries in this queue.
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* @param reserve The minimum number of entries needed to satisfy
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* any access.
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*/
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MSHRQueue(const std::string &_label, int num_entries, int reserve,
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int index);
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/** Destructor */
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~MSHRQueue();
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/**
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* Find the first MSHR that matches the provided address.
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* @param addr The address to find.
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* @return Pointer to the matching MSHR, null if not found.
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*/
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MSHR *findMatch(Addr addr) const;
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/**
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* Find and return all the matching entries in the provided vector.
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* @param addr The address to find.
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* @param matches The vector to return pointers to the matching entries.
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* @return True if any matches are found, false otherwise.
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* @todo Typedef the vector??
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*/
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2006-08-15 22:21:46 +02:00
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bool findMatches(Addr addr, std::vector<MSHR*>& matches) const;
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/**
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* Find any pending requests that overlap the given request.
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* @param pkt The request to find.
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* @return A pointer to the earliest matching MSHR.
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*/
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MSHR *findPending(Addr addr, int size) const;
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2007-07-27 21:46:45 +02:00
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bool checkFunctional(PacketPtr pkt, Addr blk_addr);
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2006-06-28 17:02:14 +02:00
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/**
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* Allocates a new MSHR for the request and size. This places the request
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* as the first target in the MSHR.
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* @param pkt The request to handle.
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* @param size The number in bytes to fetch from memory.
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* @return The a pointer to the MSHR allocated.
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*
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* @pre There are free entries.
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*/
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MSHR *allocate(Addr addr, int size, PacketPtr &pkt,
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Tick when, Counter order);
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/**
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* Removes the given MSHR from the queue. This places the MSHR on the
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* free list.
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* @param mshr
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*/
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void deallocate(MSHR *mshr);
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/**
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* Remove a MSHR from the queue. Returns an iterator into the
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* allocatedList for faster squash implementation.
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* @param mshr The MSHR to remove.
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* @return An iterator to the next entry in the allocatedList.
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*/
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MSHR::Iterator deallocateOne(MSHR *mshr);
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/**
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* Moves the MSHR to the front of the pending list if it is not
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* in service.
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* @param mshr The entry to move.
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*/
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void moveToFront(MSHR *mshr);
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/**
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* Mark the given MSHR as in service. This removes the MSHR from the
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* readyList. Deallocates the MSHR if it does not expect a response.
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* @param mshr The MSHR to mark in service.
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*/
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void markInService(MSHR *mshr, PacketPtr pkt);
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/**
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* Mark an in service entry as pending, used to resend a request.
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* @param mshr The MSHR to resend.
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*/
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void markPending(MSHR *mshr);
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/**
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* Squash outstanding requests with the given thread number. If a request
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* is in service, just squashes the targets.
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* @param threadNum The thread to squash.
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*/
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void squash(int threadNum);
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/**
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* Returns true if the pending list is not empty.
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* @return True if there are outstanding requests.
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*/
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bool havePending() const
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{
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return !readyList.empty();
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}
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/**
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* Returns true if there are no free entries.
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* @return True if this queue is full.
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*/
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bool isFull() const
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{
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return (allocated > numEntries - numReserve);
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}
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/**
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* Returns the MSHR at the head of the readyList.
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* @return The next request to service.
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*/
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MSHR *getNextMSHR() const
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{
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if (readyList.empty() || readyList.front()->readyTime > curTick()) {
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return NULL;
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}
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2007-06-25 15:47:05 +02:00
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return readyList.front();
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}
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2007-06-30 22:34:16 +02:00
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Tick nextMSHRReadyTime() const
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{
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return readyList.empty() ? MaxTick : readyList.front()->readyTime;
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}
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};
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2007-06-18 02:27:53 +02:00
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#endif //__MEM__CACHE__MISS__MSHR_QUEUE_HH__
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