packet.hh (2812:8e5feae75615) packet.hh (2813:89d9196456ac)
1/*
2 * Copyright (c) 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;

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47typedef Packet* PacketPtr;
48typedef uint8_t* PacketDataPtr;
49typedef std::list<PacketPtr> PacketList;
50
51//Coherence Flags
52#define NACKED_LINE 1 << 0
53#define SATISFIED 1 << 1
54#define SHARED_LINE 1 << 2
1/*
2 * Copyright (c) 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;

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47typedef Packet* PacketPtr;
48typedef uint8_t* PacketDataPtr;
49typedef std::list<PacketPtr> PacketList;
50
51//Coherence Flags
52#define NACKED_LINE 1 << 0
53#define SATISFIED 1 << 1
54#define SHARED_LINE 1 << 2
55#define CACHE_LINE_FILL 1 << 3
56#define COMPRESSED 1 << 4
57#define NO_ALLOCATE 1 << 5
55
56//For statistics we need max number of commands, hard code it at
57//20 for now. @todo fix later
58#define NUM_MEM_CMDS 1 << 9
59
60/**
61 * A Packet is used to encapsulate a transfer between two objects in
62 * the memory system (e.g., the L1 and L2 cache). (In contrast, a
63 * single Request travels all the way from the requester to the
64 * ultimate destination and back, possibly being conveyed by several
65 * different Packets along the way.)
66 */
67class Packet
68{
58
59//For statistics we need max number of commands, hard code it at
60//20 for now. @todo fix later
61#define NUM_MEM_CMDS 1 << 9
62
63/**
64 * A Packet is used to encapsulate a transfer between two objects in
65 * the memory system (e.g., the L1 and L2 cache). (In contrast, a
66 * single Request travels all the way from the requester to the
67 * ultimate destination and back, possibly being conveyed by several
68 * different Packets along the way.)
69 */
70class Packet
71{
72 public:
73 /** Temporary FLAGS field until cache gets working, this should be in coherence/sender state. */
74 uint64_t flags;
75
69 private:
70 /** A pointer to the data being transfered. It can be differnt
71 * sizes at each level of the heirarchy so it belongs in the
72 * packet, not request. This may or may not be populated when a
73 * responder recieves the packet. If not populated it memory
74 * should be allocated.
75 */
76 PacketDataPtr data;

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88
89 /** The address of the request. This address could be virtual or
90 * physical, depending on the system configuration. */
91 Addr addr;
92
93 /** The size of the request or transfer. */
94 int size;
95
76 private:
77 /** A pointer to the data being transfered. It can be differnt
78 * sizes at each level of the heirarchy so it belongs in the
79 * packet, not request. This may or may not be populated when a
80 * responder recieves the packet. If not populated it memory
81 * should be allocated.
82 */
83 PacketDataPtr data;

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95
96 /** The address of the request. This address could be virtual or
97 * physical, depending on the system configuration. */
98 Addr addr;
99
100 /** The size of the request or transfer. */
101 int size;
102
103 /** The offset within the block that represents the data. */
104 int offset;
105
96 /** Device address (e.g., bus ID) of the source of the
97 * transaction. The source is not responsible for setting this
98 * field; it is set implicitly by the interconnect when the
99 * packet * is first sent. */
100 short src;
101
102 /** Device address (e.g., bus ID) of the destination of the
103 * transaction. The special value Broadcast indicates that the
104 * packet should be routed based on its address. This field is
105 * initialized in the constructor and is thus always valid
106 * (unlike * addr, size, and src). */
107 short dest;
108
109 /** Are the 'addr' and 'size' fields valid? */
110 bool addrSizeValid;
111 /** Is the 'src' field valid? */
112 bool srcValid;
106 /** Device address (e.g., bus ID) of the source of the
107 * transaction. The source is not responsible for setting this
108 * field; it is set implicitly by the interconnect when the
109 * packet * is first sent. */
110 short src;
111
112 /** Device address (e.g., bus ID) of the destination of the
113 * transaction. The special value Broadcast indicates that the
114 * packet should be routed based on its address. This field is
115 * initialized in the constructor and is thus always valid
116 * (unlike * addr, size, and src). */
117 short dest;
118
119 /** Are the 'addr' and 'size' fields valid? */
120 bool addrSizeValid;
121 /** Is the 'src' field valid? */
122 bool srcValid;
123 /** Is the offset valid. */
124 bool offsetValid;
113
125
126
114 public:
115
116 /** Used to calculate latencies for each packet.*/
117 Tick time;
118
119 /** The special destination address indicating that the packet
120 * should be routed based on its address. */
121 static const short Broadcast = -1;

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166 IsSWPrefetch = 1 << 7,
167 IsHWPrefetch = 1 << 8
168 };
169
170 public:
171 /** List of all commands associated with a packet. */
172 enum Command
173 {
127 public:
128
129 /** Used to calculate latencies for each packet.*/
130 Tick time;
131
132 /** The special destination address indicating that the packet
133 * should be routed based on its address. */
134 static const short Broadcast = -1;

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179 IsSWPrefetch = 1 << 7,
180 IsHWPrefetch = 1 << 8
181 };
182
183 public:
184 /** List of all commands associated with a packet. */
185 enum Command
186 {
187 InvalidCmd = 0,
174 ReadReq = IsRead | IsRequest | NeedsResponse,
175 WriteReq = IsWrite | IsRequest | NeedsResponse,
176 WriteReqNoAck = IsWrite | IsRequest,
177 ReadResp = IsRead | IsResponse,
178 WriteResp = IsWrite | IsResponse,
179 Writeback = IsWrite | IsRequest,
180 SoftPFReq = IsRead | IsRequest | IsSWPrefetch | NeedsResponse,
181 HardPFReq = IsRead | IsRequest | IsHWPrefetch | NeedsResponse,
182 SoftPFResp = IsRead | IsRequest | IsSWPrefetch | IsResponse,
183 HardPFResp = IsRead | IsRequest | IsHWPrefetch | IsResponse,
184 InvalidateReq = IsInvalidate | IsRequest,
185 WriteInvalidateReq = IsWrite | IsInvalidate | IsRequest,
188 ReadReq = IsRead | IsRequest | NeedsResponse,
189 WriteReq = IsWrite | IsRequest | NeedsResponse,
190 WriteReqNoAck = IsWrite | IsRequest,
191 ReadResp = IsRead | IsResponse,
192 WriteResp = IsWrite | IsResponse,
193 Writeback = IsWrite | IsRequest,
194 SoftPFReq = IsRead | IsRequest | IsSWPrefetch | NeedsResponse,
195 HardPFReq = IsRead | IsRequest | IsHWPrefetch | NeedsResponse,
196 SoftPFResp = IsRead | IsRequest | IsSWPrefetch | IsResponse,
197 HardPFResp = IsRead | IsRequest | IsHWPrefetch | IsResponse,
198 InvalidateReq = IsInvalidate | IsRequest,
199 WriteInvalidateReq = IsWrite | IsInvalidate | IsRequest,
186 UpgradeReq = IsInvalidate | NeedsResponse
200 UpgradeReq = IsInvalidate | NeedsResponse,
201 UpgradeResp = IsInvalidate | IsResponse,
202 ReadExReq = IsRead | IsInvalidate | NeedsResponse,
203 ReadExResp = IsRead | IsInvalidate | IsResponse
187 };
188
189 /** Return the string name of the cmd field (for debugging and
190 * tracing). */
191 const std::string &cmdString() const;
192
193 /** Reutrn the string to a cmd given by idx. */
194 const std::string &cmdIdxToString(Command idx);

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201
202 bool isRead() { return (cmd & IsRead) != 0; }
203 bool isWrite() { return (cmd & IsWrite) != 0; }
204 bool isRequest() { return (cmd & IsRequest) != 0; }
205 bool isResponse() { return (cmd & IsResponse) != 0; }
206 bool needsResponse() { return (cmd & NeedsResponse) != 0; }
207 bool isInvalidate() { return (cmd * IsInvalidate) != 0; }
208
204 };
205
206 /** Return the string name of the cmd field (for debugging and
207 * tracing). */
208 const std::string &cmdString() const;
209
210 /** Reutrn the string to a cmd given by idx. */
211 const std::string &cmdIdxToString(Command idx);

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218
219 bool isRead() { return (cmd & IsRead) != 0; }
220 bool isWrite() { return (cmd & IsWrite) != 0; }
221 bool isRequest() { return (cmd & IsRequest) != 0; }
222 bool isResponse() { return (cmd & IsResponse) != 0; }
223 bool needsResponse() { return (cmd & NeedsResponse) != 0; }
224 bool isInvalidate() { return (cmd * IsInvalidate) != 0; }
225
209 bool isCacheFill() { assert("Unimplemented yet\n" && 0); }
210 bool isNoAllocate() { assert("Unimplemented yet\n" && 0); }
226 bool isCacheFill() { return (flags & CACHE_LINE_FILL) != 0; }
227 bool isNoAllocate() { return (flags & NO_ALLOCATE) != 0; }
211
212 /** Possible results of a packet's request. */
213 enum Result
214 {
215 Success,
216 BadAddress,
217 Nacked,
218 Unknown

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227
228 /** Accessor function that returns the destination index of
229 the packet. */
230 short getDest() const { return dest; }
231 void setDest(short _dest) { dest = _dest; }
232
233 Addr getAddr() const { assert(addrSizeValid); return addr; }
234 int getSize() const { assert(addrSizeValid); return size; }
228
229 /** Possible results of a packet's request. */
230 enum Result
231 {
232 Success,
233 BadAddress,
234 Nacked,
235 Unknown

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244
245 /** Accessor function that returns the destination index of
246 the packet. */
247 short getDest() const { return dest; }
248 void setDest(short _dest) { dest = _dest; }
249
250 Addr getAddr() const { assert(addrSizeValid); return addr; }
251 int getSize() const { assert(addrSizeValid); return size; }
252 int getOffset() const { assert(offsetValid); return offset; }
235
253
254 void addrOverride(Addr newAddr) { assert(addrSizeValid); addr = newAddr; }
255 void cmdOverride(Command newCmd) { cmd = newCmd; }
256
236 /** Constructor. Note that a Request object must be constructed
237 * first, but the Requests's physical address and size fields
238 * need not be valid. The command and destination addresses
239 * must be supplied. */
240 Packet(Request *_req, Command _cmd, short _dest)
241 : data(NULL), staticData(false), dynamicData(false), arrayData(false),
242 addr(_req->paddr), size(_req->size), dest(_dest),
243 addrSizeValid(_req->validPaddr),
257 /** Constructor. Note that a Request object must be constructed
258 * first, but the Requests's physical address and size fields
259 * need not be valid. The command and destination addresses
260 * must be supplied. */
261 Packet(Request *_req, Command _cmd, short _dest)
262 : data(NULL), staticData(false), dynamicData(false), arrayData(false),
263 addr(_req->paddr), size(_req->size), dest(_dest),
264 addrSizeValid(_req->validPaddr),
244 srcValid(false),
265 srcValid(false), offsetValid(false),
245 req(_req), coherence(NULL), senderState(NULL), cmd(_cmd),
246 result(Unknown)
247 {
266 req(_req), coherence(NULL), senderState(NULL), cmd(_cmd),
267 result(Unknown)
268 {
269 flags = 0;
248 }
249
270 }
271
272 /** Alternate constructor if you are trying to create a packet with
273 * a request that is for a whole block, not the address from the req.
274 * this allows for overriding the size/addr of the req.*/
275 Packet(Request *_req, Command _cmd, short _dest, int _blkSize)
276 : data(NULL), staticData(false), dynamicData(false), arrayData(false),
277 addr(_req->paddr & ~(_blkSize - 1)), size(_blkSize),
278 offset(_req->paddr & (_blkSize - 1)), dest(_dest),
279 addrSizeValid(_req->validPaddr), srcValid(false), offsetValid(true),
280 req(_req), coherence(NULL), senderState(NULL), cmd(_cmd),
281 result(Unknown)
282 {
283 flags = 0;
284 }
285
250 /** Destructor. */
251 ~Packet()
252 { deleteData(); }
253
254 /** Reinitialize packet address and size from the associated
255 * Request object, and reset other fields that may have been
256 * modified by a previous transaction. Typically called when a
257 * statically allocated Request/Packet pair is reused for

--- 78 unchanged lines hidden --- 		286 /** Destructor. */
287 ~Packet()
288 { deleteData(); }
289
290 /** Reinitialize packet address and size from the associated
291 * Request object, and reset other fields that may have been
292 * modified by a previous transaction. Typically called when a
293 * statically allocated Request/Packet pair is reused for

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