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/*
* Copyright (c) 2007 MIPS Technologies, Inc.
* All rights reserved.
*
* 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: Korey Sewell
*
*/
#ifndef __CPU_INORDER_COMM_HH__
#define __CPU_INORDER_COMM_HH__
#include <vector>
#include "arch/faults.hh"
#include "arch/isa_traits.hh"
#include "base/types.hh"
#include "cpu/inorder/inorder_dyn_inst.hh"
#include "cpu/inorder/pipeline_traits.hh"
#include "cpu/inst_seq.hh"
/** Struct that defines the information passed from in between stages */
/** This information mainly goes forward through the pipeline. */
struct InterStageStruct {
int size;
ThePipeline::DynInstPtr insts[ThePipeline::StageWidth];
bool squash;
bool branchMispredict;
bool branchTaken;
uint64_t mispredPC;
uint64_t nextPC;
InstSeqNum squashedSeqNum;
bool includeSquashInst;
InterStageStruct()
:size(0), squash(false),
branchMispredict(false), branchTaken(false),
mispredPC(0), nextPC(0),
squashedSeqNum(0), includeSquashInst(false)
{ }
};
/** Turn This into a Class */
/** Struct that defines all backwards communication. */
struct TimeStruct {
struct stageComm {
bool squash;
bool predIncorrect;
uint64_t branchAddr;
// @todo: Might want to package this kind of branch stuff into a single
// struct as it is used pretty frequently.
bool branchMispredict;
bool branchTaken;
Addr mispredPC;
TheISA::PCState nextPC;
unsigned branchCount;
// Represents the instruction that has either been retired or
// squashed. Similar to having a single bus that broadcasts the
// retired or squashed sequence number.
InstSeqNum doneSeqNum;
InstSeqNum bdelayDoneSeqNum;
bool squashDelaySlot;
//Just in case we want to do a commit/squash on a cycle
//(necessary for multiple ROBs?)
bool commitInsts;
InstSeqNum squashSeqNum;
// Communication specifically to the IQ to tell the IQ that it can
// schedule a non-speculative instruction.
InstSeqNum nonSpecSeqNum;
bool uncached;
ThePipeline::DynInstPtr uncachedLoad;
bool interruptPending;
bool clearInterrupt;
};
stageComm stageInfo[ThePipeline::NumStages][ThePipeline::MaxThreads];
bool stageBlock[ThePipeline::NumStages][ThePipeline::MaxThreads];
bool stageUnblock[ThePipeline::NumStages][ThePipeline::MaxThreads];
};
#endif //__CPU_INORDER_COMM_HH__
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