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/*
* Copyright (c) 2004-2005 The Regents of The University of Michigan
* 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.
*/
#ifndef __CPU_BETA_CPU_COMM_HH__
#define __CPU_BETA_CPU_COMM_HH__
#include <stdint.h>
#include <vector>
#include "arch/alpha/isa_traits.hh"
#include "cpu/inst_seq.hh"
// Find better place to put this typedef.
// The impl might be the best place for this.
typedef short int PhysRegIndex;
template<class Impl>
struct SimpleFetchSimpleDecode {
typedef typename Impl::DynInstPtr DynInstPtr;
int size;
DynInstPtr insts[Impl::MaxWidth];
};
template<class Impl>
struct SimpleDecodeSimpleRename {
typedef typename Impl::DynInstPtr DynInstPtr;
int size;
DynInstPtr insts[Impl::MaxWidth];
};
template<class Impl>
struct SimpleRenameSimpleIEW {
typedef typename Impl::DynInstPtr DynInstPtr;
int size;
DynInstPtr insts[Impl::MaxWidth];
};
template<class Impl>
struct SimpleIEWSimpleCommit {
typedef typename Impl::DynInstPtr DynInstPtr;
int size;
DynInstPtr insts[Impl::MaxWidth];
bool squash;
bool branchMispredict;
bool branchTaken;
uint64_t mispredPC;
uint64_t nextPC;
InstSeqNum squashedSeqNum;
};
template<class Impl>
struct IssueStruct {
typedef typename Impl::DynInstPtr DynInstPtr;
int size;
DynInstPtr insts[Impl::MaxWidth];
};
struct TimeBufStruct {
struct decodeComm {
bool squash;
bool stall;
bool predIncorrect;
uint64_t branchAddr;
InstSeqNum doneSeqNum;
// Might want to package this kind of branch stuff into a single
// struct as it is used pretty frequently.
bool branchMispredict;
bool branchTaken;
uint64_t mispredPC;
uint64_t nextPC;
};
decodeComm decodeInfo;
// Rename can't actually tell anything to squash or send a new PC back
// because it doesn't do anything along those lines. But maybe leave
// these fields in here to keep the stages mostly orthagonal.
struct renameComm {
bool squash;
bool stall;
uint64_t nextPC;
};
renameComm renameInfo;
struct iewComm {
bool stall;
// Also eventually include skid buffer space.
unsigned freeIQEntries;
};
iewComm iewInfo;
struct commitComm {
bool squash;
bool stall;
unsigned freeROBEntries;
bool branchMispredict;
bool branchTaken;
uint64_t mispredPC;
uint64_t nextPC;
bool robSquashing;
// 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;
// Extra bit of information so that the LDSTQ only updates when it
// needs to.
bool commitIsLoad;
// Communication specifically to the IQ to tell the IQ that it can
// schedule a non-speculative instruction.
InstSeqNum nonSpecSeqNum;
};
commitComm commitInfo;
};
#endif //__CPU_BETA_CPU_COMM_HH__
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