1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* Copyright (c) 1999-2005 Mark D. Hill and David A. Wood
* 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.
*/
// CoherenceRequestType
enumeration(CoherenceRequestType, desc="...") {
GETX, desc="Get eXclusive";
GETS, desc="Get Shared";
PUTX, desc="Put eXclusive";
WB_ACK, desc="Writeback ack";
WB_NACK, desc="Writeback neg. ack";
INV, desc="Invalidation";
}
// CoherenceResponseType
enumeration(CoherenceResponseType, desc="...") {
ACK, desc="ACKnowledgment, responder doesn't have a copy";
DATA, desc="Data";
DATA_EXCLUSIVE_CLEAN, desc="Data, no other processor has a copy, data is clean";
DATA_EXCLUSIVE_DIRTY, desc="Data, no other processor has a copy, data is dirty";
UNBLOCK, desc="Unblock";
UNBLOCK_EXCLUSIVE, desc="Unblock, we're in E/M";
WRITEBACK_CLEAN, desc="Clean writeback (no data)";
WRITEBACK_DIRTY, desc="Dirty writeback (contains data)";
WRITEBACK, desc="Generic writeback (contains data)";
}
// RequestMsg (and also forwarded requests)
structure(RequestMsg, desc="...", interface="Message") {
Addr addr, desc="Physical address for this request";
CoherenceRequestType Type, desc="Type of request (GetS, GetX, PutX, etc)";
MachineID Requestor, desc="Node who initiated the request";
NetDest Destination, desc="Multicast destination mask";
DataBlock DataBlk, desc="data for the cache line";
MessageSizeType MessageSize, desc="size category of the message";
bool functionalRead(Packet *pkt) {
// Valid data block is only present in PUTX messages
if (Type == CoherenceRequestType:PUTX) {
return testAndRead(addr, DataBlk, pkt);
}
return false;
}
bool functionalWrite(Packet *pkt) {
// No check on message type required since the protocol should read
// data block from only those messages that contain valid data
return testAndWrite(addr, DataBlk, pkt);
}
}
// ResponseMsg (and also unblock requests)
structure(ResponseMsg, desc="...", interface="Message") {
Addr addr, desc="Physical address for this request";
CoherenceResponseType Type, desc="Type of response (Ack, Data, etc)";
MachineID Sender, desc="Node who sent the data";
NetDest Destination, desc="Node to whom the data is sent";
DataBlock DataBlk, desc="data for the cache line";
bool Dirty, desc="Is the data dirty (different than memory)?";
MessageSizeType MessageSize, desc="size category of the message";
bool functionalRead(Packet *pkt) {
// A check on message type should appear here so that only those
// messages that contain data
return testAndRead(addr, DataBlk, pkt);
}
bool functionalWrite(Packet *pkt) {
// No check on message type required since the protocol should read
// data block from only those messages that contain valid data
return testAndWrite(addr, DataBlk, pkt);
}
}
enumeration(DMARequestType, desc="...", default="DMARequestType_NULL") {
READ, desc="Memory Read";
WRITE, desc="Memory Write";
NULL, desc="Invalid";
}
enumeration(DMAResponseType, desc="...", default="DMAResponseType_NULL") {
DATA, desc="DATA read";
ACK, desc="ACK write";
NULL, desc="Invalid";
}
structure(DMARequestMsg, desc="...", interface="Message") {
DMARequestType Type, desc="Request type (read/write)";
Addr PhysicalAddress, desc="Physical address for this request";
Addr LineAddress, desc="Line address for this request";
MachineID Requestor, desc="Node who initiated the request";
NetDest Destination, desc="Destination";
DataBlock DataBlk, desc="DataBlk attached to this request";
int Len, desc="The length of the request";
MessageSizeType MessageSize, desc="size category of the message";
bool functionalRead(Packet *pkt) {
return testAndRead(LineAddress, DataBlk, pkt);
}
bool functionalWrite(Packet *pkt) {
return testAndWrite(LineAddress, DataBlk, pkt);
}
}
structure(DMAResponseMsg, desc="...", interface="Message") {
DMAResponseType Type, desc="Response type (DATA/ACK)";
Addr PhysicalAddress, desc="Physical address for this request";
Addr LineAddress, desc="Line address for this request";
NetDest Destination, desc="Destination";
DataBlock DataBlk, desc="DataBlk attached to this request";
MessageSizeType MessageSize, desc="size category of the message";
bool functionalRead(Packet *pkt) {
return testAndRead(LineAddress, DataBlk, pkt);
}
bool functionalWrite(Packet *pkt) {
return testAndWrite(LineAddress, DataBlk, pkt);
}
}
|
