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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
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* 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
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andrew Bardsley
*/
/**
* @file
*
* The constructed pipeline. Kept out of MinorCPU to keep the interface
* between the CPU and its grubby implementation details clean.
*/
#ifndef __CPU_MINOR_PIPELINE_HH__
#define __CPU_MINOR_PIPELINE_HH__
#include "cpu/minor/activity.hh"
#include "cpu/minor/cpu.hh"
#include "cpu/minor/decode.hh"
#include "cpu/minor/execute.hh"
#include "cpu/minor/fetch1.hh"
#include "cpu/minor/fetch2.hh"
#include "params/MinorCPU.hh"
#include "sim/ticked_object.hh"
namespace Minor
{
/**
* @namespace Minor
*
* Minor contains all the definitions within the MinorCPU apart from the CPU
* class itself
*/
/** The constructed pipeline. Kept out of MinorCPU to keep the interface
* between the CPU and its grubby implementation details clean. */
class Pipeline : public Ticked
{
protected:
MinorCPU &cpu;
/** Allow cycles to be skipped when the pipeline is idle */
bool allow_idling;
Latch<ForwardLineData> f1ToF2;
Latch<BranchData> f2ToF1;
Latch<ForwardInstData> f2ToD;
Latch<ForwardInstData> dToE;
Latch<BranchData> eToF1;
Execute execute;
Decode decode;
Fetch2 fetch2;
Fetch1 fetch1;
/** Activity recording for the pipeline. This is access through the CPU
* by the pipeline stages but belongs to the Pipeline as it is the
* cleanest place to initialise it */
MinorActivityRecorder activityRecorder;
public:
/** Enumerated ids of the 'stages' for the activity recorder */
enum StageId
{
/* A stage representing wakeup of the whole processor */
CPUStageId = 0,
/* Real pipeline stages */
Fetch1StageId, Fetch2StageId, DecodeStageId, ExecuteStageId,
Num_StageId /* Stage count */
};
/** True after drain is called but draining isn't complete */
bool needToSignalDrained;
public:
Pipeline(MinorCPU &cpu_, MinorCPUParams ¶ms);
public:
/** Wake up the Fetch unit. This is needed on thread activation esp.
* after quiesce wakeup */
void wakeupFetch();
/** Try to drain the CPU */
bool drain();
void drainResume();
/** Test to see if the CPU is drained */
bool isDrained();
/** A custom evaluate allows report in the right place (between
* stages and pipeline advance) */
void evaluate();
void countCycles(Cycles delta) M5_ATTR_OVERRIDE
{
cpu.ppCycles->notify(delta);
}
void minorTrace() const;
/** Functions below here are BaseCPU operations passed on to pipeline
* stages */
/** Return the IcachePort belonging to Fetch1 for the CPU */
MinorCPU::MinorCPUPort &getInstPort();
/** Return the DcachePort belonging to Execute for the CPU */
MinorCPU::MinorCPUPort &getDataPort();
/** To give the activity recorder to the CPU */
MinorActivityRecorder *getActivityRecorder() { return &activityRecorder; }
};
}
#endif /* __CPU_MINOR_PIPELINE_HH__ */
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