cv_spec_state.hh

linux下基于c++的处理器仿真平台。具有处理器流水线

/*
 * Copyright (c) 2001, 2002, 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator, developed by Nathan Binkert,
 * Erik Hallnor, Steve Raasch, and Steve Reinhardt, with contributions
 * from Ron Dreslinski, Dave Greene, Lisa Hsu, Kevin Lim, Ali Saidi,
 * and Andrew Schultz.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 */

/*
 * This file is a part of the SimpleScalar tool suite written by
 * Todd M. Austin as a part of the Multiscalar Research Project.
 *
 * The tool suite is currently maintained by Doug Burger and Todd M. Austin.
 *
 * Copyright (C) 1997, 1998 by Todd M. Austin
 *
 * This source file is distributed "as is" in the hope that it will be
 * useful.  The tool set comes with no warranty, and no author or
 * distributor accepts any responsibility for the consequences of its
 * use.
 *
 * Everyone is granted permission to copy, modify and redistribute
 * this tool set under the following conditions:
 *
 *    This source code is distributed for non-commercial use only.
 *    Please contact the maintainer for restrictions applying to
 *    commercial use.
 *
 *    Permission is granted to anyone to make or distribute copies
 *    of this source code, either as received or modified, in any
 *    medium, provided that all copyright notices, permission and
 *    nonwarranty notices are preserved, and that the distributor
 *    grants the recipient permission for further redistribution as
 *    permitted by this document.
 *
 *    Permission is granted to distribute this file in compiled
 *    or executable form under the same conditions that apply for
 *    source code, provided that either:
 *
 *    A. it is accompanied by the corresponding machine-readable
 *       source code,
 *    B. it is accompanied by a written offer, with no time limit,
 *       to give anyone a machine-readable copy of the corresponding
 *       source code in return for reimbursement of the cost of
 *       distribution.  This written offer must permit verbatim
 *       duplication by anyone, or
 *    C. it is distributed by someone who received only the
 *       executable form, and is accompanied by a copy of the
 *       written offer of source code that they received concurrently.
 *
 * In other words, you are welcome to use, share and improve this
 * source file.  You are forbidden to forbid anyone else to use, share
 * and improve what you give them.
 */

#ifndef __ENCUMBERED_CPU_FULL_CV_SPEC_STATE_HH__
#define __ENCUMBERED_CPU_FULL_CV_SPEC_STATE_HH__

#include "base/res_list.hh"
#include "cpu/inst_seq.hh"
#include "encumbered/cpu/full/create_vector.hh"

#define NUM_DEFAULT_PRODUCER_ENTRIES 20

class CreateVecSpecState
{
  private:
    struct cv_entry
    {
	InstSeqNum seq;
	unsigned  reg;  // which reg this link belongs to
	CVLink   link;
    };

    CreateVector *true_cv;
    unsigned num_entries;

    //  A place to store this thread's use_spec_cv value
    std::bitset<TotalNumRegs> stored_spec_cv;

    res_list<cv_entry> *cv_list;
    typedef res_list<cv_entry>::iterator cv_iterator;

  public:
    //
    //  Constructor
    //
    CreateVecSpecState() {
	cv_list =
	    new res_list<cv_entry>(NUM_DEFAULT_PRODUCER_ENTRIES, true, 4);
    }

    void initialize(CreateVector *);

    //
    //  Restore this state
    //
    void restore();

    //
    //  Destructor
    //
    ~CreateVecSpecState() {
	if (cv_list)
	    delete cv_list;
    }
};


#define NUM_DEFAULT_STATES 100
class SpecStateList
{
  private:
    res_list<CreateVecSpecState> *state_list;

  public:
    typedef res_list<CreateVecSpecState>::iterator ss_iterator;

    SpecStateList() {
	state_list =
	    new res_list<CreateVecSpecState>(NUM_DEFAULT_STATES, true, 2);
    }

    ss_iterator get(CreateVector *cv) {
	ss_iterator i = state_list->add_tail();
	i->initialize(cv);
	return i;
    }

    void release(ss_iterator &i) {
	i->restore();
	dump(i);
    }

    void dump(ss_iterator &i) {
	state_list->remove(i);
    }
};

#endif // __ENCUMBERED_CPU_FULL_CV_SPEC_STATE_HH__