scoreboard.hh

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/*
 * Copyright (c) 2013-2014 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
 *
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 * 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
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 * this software without specific prior written permission.
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Andrew Bardsley
 */

#ifndef __CPU_MINOR_SCOREBOARD_HH__
#define __CPU_MINOR_SCOREBOARD_HH__

#include "cpu/minor/cpu.hh"
#include "cpu/minor/dyn_inst.hh"
#include "cpu/minor/trace.hh"

namespace Minor
{

class Scoreboard : public Named
{
  public:
    const unsigned numRegs;

    typedef TheISA::RegIndex RegIndex;

    typedef unsigned short int Index;

    std::vector<Index> numResults;

    std::vector<Index> numUnpredictableResults;

    std::vector<int> fuIndices;

    std::vector<Cycles> returnCycle;

    std::vector<InstSeqNum> writingInst;

  public:
    Scoreboard(const std::string &name) :
        Named(name),
        numRegs(TheISA::NumIntRegs + TheISA::NumCCRegs +
            TheISA::NumFloatRegs),
        numResults(numRegs, 0),
        numUnpredictableResults(numRegs, 0),
        fuIndices(numRegs, 0),
        returnCycle(numRegs, Cycles(0)),
        writingInst(numRegs, 0)
    { }

  public:
    bool findIndex(RegIndex reg, Index &scoreboard_index);

    void markupInstDests(MinorDynInstPtr inst, Cycles retire_time,
        ThreadContext *thread_context, bool mark_unpredictable);

    void clearInstDests(MinorDynInstPtr inst, bool clear_unpredictable);

    InstSeqNum execSeqNumToWaitFor(MinorDynInstPtr inst,
        ThreadContext *thread_context);

    bool canInstIssue(MinorDynInstPtr inst,
        const std::vector<Cycles> *src_reg_relative_latencies,
        const std::vector<bool> *cant_forward_from_fu_indices,
        Cycles now, ThreadContext *thread_context);

    void minorTrace() const;
};

}

#endif /* __CPU_MINOR_SCOREBOARD_HH__ */