comm.hh revision 2935:d1223a6c9156
1/* 2 * Copyright (c) 2004-2006 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Kevin Lim 29 */ 30 31#ifndef __CPU_O3_COMM_HH__ 32#define __CPU_O3_COMM_HH__ 33 34#include <vector> 35 36#include "arch/faults.hh" 37#include "arch/isa_traits.hh" 38#include "cpu/inst_seq.hh" 39#include "sim/host.hh" 40 41// Typedef for physical register index type. Although the Impl would be the 42// most likely location for this, there are a few classes that need this 43// typedef yet are not templated on the Impl. For now it will be defined here. 44typedef short int PhysRegIndex; 45 46/** Struct that defines the information passed from fetch to decode. */ 47template<class Impl> 48struct DefaultFetchDefaultDecode { 49 typedef typename Impl::DynInstPtr DynInstPtr; 50 51 int size; 52 53 DynInstPtr insts[Impl::MaxWidth]; 54 Fault fetchFault; 55 InstSeqNum fetchFaultSN; 56 bool clearFetchFault; 57}; 58 59/** Struct that defines the information passed from decode to rename. */ 60template<class Impl> 61struct DefaultDecodeDefaultRename { 62 typedef typename Impl::DynInstPtr DynInstPtr; 63 64 int size; 65 66 DynInstPtr insts[Impl::MaxWidth]; 67}; 68 69/** Struct that defines the information passed from rename to IEW. */ 70template<class Impl> 71struct DefaultRenameDefaultIEW { 72 typedef typename Impl::DynInstPtr DynInstPtr; 73 74 int size; 75 76 DynInstPtr insts[Impl::MaxWidth]; 77}; 78 79/** Struct that defines the information passed from IEW to commit. */ 80template<class Impl> 81struct DefaultIEWDefaultCommit { 82 typedef typename Impl::DynInstPtr DynInstPtr; 83 84 int size; 85 86 DynInstPtr insts[Impl::MaxWidth]; 87 88 bool squash[Impl::MaxThreads]; 89 bool branchMispredict[Impl::MaxThreads]; 90 bool branchTaken[Impl::MaxThreads]; 91 bool condDelaySlotBranch[Impl::MaxThreads]; 92 uint64_t mispredPC[Impl::MaxThreads]; 93 uint64_t nextPC[Impl::MaxThreads]; 94 InstSeqNum squashedSeqNum[Impl::MaxThreads]; 95 96 bool includeSquashInst[Impl::MaxThreads]; 97}; 98 99template<class Impl> 100struct IssueStruct { 101 typedef typename Impl::DynInstPtr DynInstPtr; 102 103 int size; 104 105 DynInstPtr insts[Impl::MaxWidth]; 106}; 107 108/** Struct that defines all backwards communication. */ 109template<class Impl> 110struct TimeBufStruct { 111 struct decodeComm { 112 bool squash; 113 bool predIncorrect; 114 uint64_t branchAddr; 115 116 InstSeqNum doneSeqNum; 117 InstSeqNum bdelayDoneSeqNum; 118 119 // @todo: Might want to package this kind of branch stuff into a single 120 // struct as it is used pretty frequently. 121 bool branchMispredict; 122 bool branchTaken; 123 uint64_t mispredPC; 124 uint64_t nextPC; 125 126 unsigned branchCount; 127 }; 128 129 decodeComm decodeInfo[Impl::MaxThreads]; 130 131 struct renameComm { 132 }; 133 134 renameComm renameInfo[Impl::MaxThreads]; 135 136 struct iewComm { 137 // Also eventually include skid buffer space. 138 bool usedIQ; 139 unsigned freeIQEntries; 140 bool usedLSQ; 141 unsigned freeLSQEntries; 142 143 unsigned iqCount; 144 unsigned ldstqCount; 145 146 unsigned dispatched; 147 unsigned dispatchedToLSQ; 148 }; 149 150 iewComm iewInfo[Impl::MaxThreads]; 151 152 struct commitComm { 153 bool usedROB; 154 unsigned freeROBEntries; 155 bool emptyROB; 156 157 bool squash; 158 bool robSquashing; 159 160 bool branchMispredict; 161 bool branchTaken; 162 uint64_t mispredPC; 163 uint64_t nextPC; 164 165 // Represents the instruction that has either been retired or 166 // squashed. Similar to having a single bus that broadcasts the 167 // retired or squashed sequence number. 168 InstSeqNum doneSeqNum; 169 170 InstSeqNum bdelayDoneSeqNum; 171 bool squashDelaySlot; 172 173 //Just in case we want to do a commit/squash on a cycle 174 //(necessary for multiple ROBs?) 175 bool commitInsts; 176 InstSeqNum squashSeqNum; 177 178 // Communication specifically to the IQ to tell the IQ that it can 179 // schedule a non-speculative instruction. 180 InstSeqNum nonSpecSeqNum; 181 182 // Hack for now to send back an uncached access to the IEW stage. 183 typedef typename Impl::DynInstPtr DynInstPtr; 184 bool uncached; 185 DynInstPtr uncachedLoad; 186 187 bool interruptPending; 188 bool clearInterrupt; 189 }; 190 191 commitComm commitInfo[Impl::MaxThreads]; 192 193 bool decodeBlock[Impl::MaxThreads]; 194 bool decodeUnblock[Impl::MaxThreads]; 195 bool renameBlock[Impl::MaxThreads]; 196 bool renameUnblock[Impl::MaxThreads]; 197 bool iewBlock[Impl::MaxThreads]; 198 bool iewUnblock[Impl::MaxThreads]; 199 bool commitBlock[Impl::MaxThreads]; 200 bool commitUnblock[Impl::MaxThreads]; 201}; 202 203#endif //__CPU_O3_COMM_HH__ 204