1/*
2 * Copyright (c) 2004-2005 The Regents of The University of Michigan
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

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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_CPU_COMM_HH__
32#define __CPU_O3_CPU_COMM_HH__
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
40// Find better place to put this typedef.
41// The impl might be the best place for this.
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
46template<class Impl>
45struct SimpleFetchSimpleDecode {
47struct DefaultFetchDefaultDecode {
48 typedef typename Impl::DynInstPtr DynInstPtr;
49
50 int size;
51
52 DynInstPtr insts[Impl::MaxWidth];
53 Fault fetchFault;
54 InstSeqNum fetchFaultSN;
55 bool clearFetchFault;
56};
57
58template<class Impl>
54struct SimpleDecodeSimpleRename {
59struct DefaultDecodeDefaultRename {
60 typedef typename Impl::DynInstPtr DynInstPtr;
61
62 int size;
63
64 DynInstPtr insts[Impl::MaxWidth];
65};
66
67template<class Impl>
63struct SimpleRenameSimpleIEW {
68struct DefaultRenameDefaultIEW {
69 typedef typename Impl::DynInstPtr DynInstPtr;
70
71 int size;
72
73 DynInstPtr insts[Impl::MaxWidth];
74};
75
76template<class Impl>
72struct SimpleIEWSimpleCommit {
77struct DefaultIEWDefaultCommit {
78 typedef typename Impl::DynInstPtr DynInstPtr;
79
80 int size;
81
82 DynInstPtr insts[Impl::MaxWidth];
83
79 bool squash;
80 bool branchMispredict;
81 bool branchTaken;
82 uint64_t mispredPC;
83 uint64_t nextPC;
84 InstSeqNum squashedSeqNum;
84 bool squash[Impl::MaxThreads];
85 bool branchMispredict[Impl::MaxThreads];
86 bool branchTaken[Impl::MaxThreads];
87 uint64_t mispredPC[Impl::MaxThreads];
88 uint64_t nextPC[Impl::MaxThreads];
89 InstSeqNum squashedSeqNum[Impl::MaxThreads];
90
91 bool includeSquashInst[Impl::MaxThreads];
92};
93
94template<class Impl>
95struct IssueStruct {
96 typedef typename Impl::DynInstPtr DynInstPtr;
97
98 int size;
99
100 DynInstPtr insts[Impl::MaxWidth];
101};
102
103template<class Impl>
104struct TimeBufStruct {
105 struct decodeComm {
106 bool squash;
99 bool stall;
107 bool predIncorrect;
108 uint64_t branchAddr;
109
110 InstSeqNum doneSeqNum;
111
105 // Might want to package this kind of branch stuff into a single
112 // @todo: Might want to package this kind of branch stuff into a single
113 // struct as it is used pretty frequently.
114 bool branchMispredict;
115 bool branchTaken;
116 uint64_t mispredPC;
117 uint64_t nextPC;
118
119 unsigned branchCount;
120 };
121
113 decodeComm decodeInfo;
122 decodeComm decodeInfo[Impl::MaxThreads];
123
124 // Rename can't actually tell anything to squash or send a new PC back
125 // because it doesn't do anything along those lines. But maybe leave
126 // these fields in here to keep the stages mostly orthagonal.
127 struct renameComm {
128 bool squash;
120 bool stall;
129
130 uint64_t nextPC;
131 };
132
125 renameComm renameInfo;
133 renameComm renameInfo[Impl::MaxThreads];
134
135 struct iewComm {
128 bool stall;
129
136 // Also eventually include skid buffer space.
137 bool usedIQ;
138 unsigned freeIQEntries;
139 bool usedLSQ;
140 unsigned freeLSQEntries;
141
142 unsigned iqCount;
143 unsigned ldstqCount;
144
145 unsigned dispatched;
146 unsigned dispatchedToLSQ;
147 };
148
134 iewComm iewInfo;
149 iewComm iewInfo[Impl::MaxThreads];
150
151 struct commitComm {
137 bool squash;
138 bool stall;
152 bool usedROB;
153 unsigned freeROBEntries;
154 bool emptyROB;
155
156 bool squash;
157 bool robSquashing;
158
159 bool branchMispredict;
160 bool branchTaken;
161 uint64_t mispredPC;
162 uint64_t nextPC;
163
146 bool robSquashing;
147
164 // Represents the instruction that has either been retired or
165 // squashed. Similar to having a single bus that broadcasts the
166 // retired or squashed sequence number.
167 InstSeqNum doneSeqNum;
168
153 // Extra bit of information so that the LDSTQ only updates when it
154 // needs to.
155 bool commitIsLoad;
169 //Just in case we want to do a commit/squash on a cycle
170 //(necessary for multiple ROBs?)
171 bool commitInsts;
172 InstSeqNum squashSeqNum;
173
174 // Communication specifically to the IQ to tell the IQ that it can
175 // schedule a non-speculative instruction.
176 InstSeqNum nonSpecSeqNum;
177
178 // Hack for now to send back an uncached access to the IEW stage.
179 typedef typename Impl::DynInstPtr DynInstPtr;
180 bool uncached;
181 DynInstPtr uncachedLoad;
182
183 bool interruptPending;
184 bool clearInterrupt;
185 };
186
162 commitComm commitInfo;
187 commitComm commitInfo[Impl::MaxThreads];
188
189 bool decodeBlock[Impl::MaxThreads];
190 bool decodeUnblock[Impl::MaxThreads];
191 bool renameBlock[Impl::MaxThreads];
192 bool renameUnblock[Impl::MaxThreads];
193 bool iewBlock[Impl::MaxThreads];
194 bool iewUnblock[Impl::MaxThreads];
195 bool commitBlock[Impl::MaxThreads];
196 bool commitUnblock[Impl::MaxThreads];
197};
198
165#endif //__CPU_O3_CPU_COMM_HH__
199#endif //__CPU_O3_COMM_HH__