comm.hh revision 9046:a1104cc13db2
1/* 2 * Copyright (c) 2011 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2004-2006 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Kevin Lim 41 */ 42 43#ifndef __CPU_O3_COMM_HH__ 44#define __CPU_O3_COMM_HH__ 45 46#include <vector> 47 48#include "arch/types.hh" 49#include "base/types.hh" 50#include "cpu/inst_seq.hh" 51#include "sim/faults.hh" 52 53// Typedef for physical register index type. Although the Impl would be the 54// most likely location for this, there are a few classes that need this 55// typedef yet are not templated on the Impl. For now it will be defined here. 56typedef short int PhysRegIndex; 57 58/** Struct that defines the information passed from fetch to decode. */ 59template<class Impl> 60struct DefaultFetchDefaultDecode { 61 typedef typename Impl::DynInstPtr DynInstPtr; 62 63 int size; 64 65 DynInstPtr insts[Impl::MaxWidth]; 66 Fault fetchFault; 67 InstSeqNum fetchFaultSN; 68 bool clearFetchFault; 69}; 70 71/** Struct that defines the information passed from decode to rename. */ 72template<class Impl> 73struct DefaultDecodeDefaultRename { 74 typedef typename Impl::DynInstPtr DynInstPtr; 75 76 int size; 77 78 DynInstPtr insts[Impl::MaxWidth]; 79}; 80 81/** Struct that defines the information passed from rename to IEW. */ 82template<class Impl> 83struct DefaultRenameDefaultIEW { 84 typedef typename Impl::DynInstPtr DynInstPtr; 85 86 int size; 87 88 DynInstPtr insts[Impl::MaxWidth]; 89}; 90 91/** Struct that defines the information passed from IEW to commit. */ 92template<class Impl> 93struct DefaultIEWDefaultCommit { 94 typedef typename Impl::DynInstPtr DynInstPtr; 95 96 int size; 97 98 DynInstPtr insts[Impl::MaxWidth]; 99 DynInstPtr mispredictInst[Impl::MaxThreads]; 100 Addr mispredPC[Impl::MaxThreads]; 101 InstSeqNum squashedSeqNum[Impl::MaxThreads]; 102 TheISA::PCState pc[Impl::MaxThreads]; 103 104 bool squash[Impl::MaxThreads]; 105 bool branchMispredict[Impl::MaxThreads]; 106 bool branchTaken[Impl::MaxThreads]; 107 bool includeSquashInst[Impl::MaxThreads]; 108}; 109 110template<class Impl> 111struct IssueStruct { 112 typedef typename Impl::DynInstPtr DynInstPtr; 113 114 int size; 115 116 DynInstPtr insts[Impl::MaxWidth]; 117}; 118 119/** Struct that defines all backwards communication. */ 120template<class Impl> 121struct TimeBufStruct { 122 typedef typename Impl::DynInstPtr DynInstPtr; 123 struct decodeComm { 124 uint64_t branchAddr; 125 InstSeqNum doneSeqNum; 126 DynInstPtr mispredictInst; 127 DynInstPtr squashInst; 128 Addr mispredPC; 129 TheISA::PCState nextPC; 130 unsigned branchCount; 131 bool squash; 132 bool predIncorrect; 133 bool branchMispredict; 134 bool branchTaken; 135 }; 136 137 decodeComm decodeInfo[Impl::MaxThreads]; 138 139 struct renameComm { 140 }; 141 142 renameComm renameInfo[Impl::MaxThreads]; 143 144 struct iewComm { 145 // Also eventually include skid buffer space. 146 bool usedIQ; 147 unsigned freeIQEntries; 148 bool usedLSQ; 149 unsigned freeLSQEntries; 150 151 unsigned iqCount; 152 unsigned ldstqCount; 153 154 unsigned dispatched; 155 unsigned dispatchedToLSQ; 156 }; 157 158 iewComm iewInfo[Impl::MaxThreads]; 159 160 struct commitComm { 161 162 /////////////// For Decode, IEW, Rename, Fetch /////////// 163 bool squash; 164 bool robSquashing; 165 166 ////////// For Fetch & IEW ///////////// 167 // Represents the instruction that has either been retired or 168 // squashed. Similar to having a single bus that broadcasts the 169 // retired or squashed sequence number. 170 InstSeqNum doneSeqNum; 171 172 ////////////// For Rename ///////////////// 173 // Rename should re-read number of free rob entries 174 bool usedROB; 175 // Notify Rename that the ROB is empty 176 bool emptyROB; 177 // Tell Rename how many free entries it has in the ROB 178 unsigned freeROBEntries; 179 180 181 ///////////// For Fetch ////////////////// 182 // Provide fetch the instruction that mispredicted, if this 183 // pointer is not-null a misprediction occured 184 DynInstPtr mispredictInst; 185 // Was the branch taken or not 186 bool branchTaken; 187 // The pc of the next instruction to execute. This is the next 188 // instruction for a branch mispredict, but the same instruction for 189 // order violation and the like 190 TheISA::PCState pc; 191 192 // Instruction that caused the a non-mispredict squash 193 DynInstPtr squashInst; 194 // If an interrupt is pending and fetch should stall 195 bool interruptPending; 196 // If the interrupt ended up being cleared before being handled 197 bool clearInterrupt; 198 199 //////////// For IEW ////////////////// 200 // Communication specifically to the IQ to tell the IQ that it can 201 // schedule a non-speculative instruction. 202 InstSeqNum nonSpecSeqNum; 203 204 // Hack for now to send back an uncached access to the IEW stage. 205 bool uncached; 206 DynInstPtr uncachedLoad; 207 208 }; 209 210 commitComm commitInfo[Impl::MaxThreads]; 211 212 bool decodeBlock[Impl::MaxThreads]; 213 bool decodeUnblock[Impl::MaxThreads]; 214 bool renameBlock[Impl::MaxThreads]; 215 bool renameUnblock[Impl::MaxThreads]; 216 bool iewBlock[Impl::MaxThreads]; 217 bool iewUnblock[Impl::MaxThreads]; 218 bool commitBlock[Impl::MaxThreads]; 219 bool commitUnblock[Impl::MaxThreads]; 220}; 221 222#endif //__CPU_O3_COMM_HH__ 223