func_unit.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
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * 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
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Andrew Bardsley
 */

#ifndef __CPU_MINOR_FUNC_UNIT_HH__
#define __CPU_MINOR_FUNC_UNIT_HH__

#include "cpu/minor/buffers.hh"
#include "cpu/minor/dyn_inst.hh"
#include "cpu/func_unit.hh"
#include "cpu/timing_expr.hh"
#include "params/MinorFU.hh"
#include "params/MinorFUPool.hh"
#include "params/MinorOpClass.hh"
#include "params/MinorOpClassSet.hh"
#include "sim/clocked_object.hh"

class MinorOpClass : public SimObject
{
  public:
    OpClass opClass;

  public:
    MinorOpClass(const MinorOpClassParams *params) :
        SimObject(params),
        opClass(params->opClass)
    { }
};

class MinorOpClassSet : public SimObject
{
  public:
    std::vector<MinorOpClass *> opClasses;

    std::vector<bool> capabilityList;

  public:
    MinorOpClassSet(const MinorOpClassSetParams *params);

  public:
    bool provides(OpClass op_class) { return capabilityList[op_class]; }
};

class MinorFUTiming: public SimObject
{
  public:
    uint64_t mask;
    uint64_t match;

    std::string description;

    bool suppress;

    Cycles extraCommitLat;
    TimingExpr *extraCommitLatExpr;

    Cycles extraAssumedLat;

    std::vector<Cycles> srcRegsRelativeLats;

    MinorOpClassSet *opClasses;

  public:
    MinorFUTiming(const MinorFUTimingParams *params);

  public:
    bool provides(OpClass op_class) { return opClasses->provides(op_class); }
};

class MinorFU : public SimObject
{
  public:
    MinorOpClassSet *opClasses;

    Cycles opLat;

    Cycles issueLat;

    std::vector<unsigned int> cantForwardFromFUIndices;

    std::vector<MinorFUTiming *> timings;

  public:
    MinorFU(const MinorFUParams *params) :
        SimObject(params),
        opClasses(params->opClasses),
        opLat(params->opLat),
        issueLat(params->issueLat),
        cantForwardFromFUIndices(params->cantForwardFromFUIndices),
        timings(params->timings)
    { }
};

class MinorFUPool : public SimObject
{
  public:
    std::vector<MinorFU *> funcUnits;

  public:
    MinorFUPool(const MinorFUPoolParams *params) :
        SimObject(params),
        funcUnits(params->funcUnits)
    { }
};

namespace Minor
{

class QueuedInst
{
  public:
    MinorDynInstPtr inst;

  public:
    QueuedInst(MinorDynInstPtr inst_ = MinorDynInst::bubble()) :
        inst(inst_)
    { }

  public:
    void reportData(std::ostream &os) const;
    bool isBubble() const { return inst->isBubble(); }

    static QueuedInst bubble()
    { return QueuedInst(MinorDynInst::bubble()); }
};

typedef SelfStallingPipeline<QueuedInst,
    ReportTraitsAdaptor<QueuedInst> > FUPipelineBase;

class FUPipeline : public FUPipelineBase, public FuncUnit
{
  public:
    const MinorFU &description;

    ClockedObject &timeSource;

    std::bitset<Num_OpClasses> capabilityList;

    std::vector<bool> cantForwardFromFUIndices;

  public:
    Cycles nextInsertCycle;

  public:
    FUPipeline(const std::string &name, const MinorFU &description_,
        ClockedObject &timeSource_);

  public:
    Cycles cyclesBeforeInsert();

    bool canInsert() const;

    MinorFUTiming *findTiming(const StaticInstPtr &inst);

    void advance();
};

}

#endif /* __CPU_MINOR_FUNC_UNIT_HH__ */