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; 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: Ron Dreslinski 29 * Steve Reinhardt 30 * Ali Saidi 31 */ 32 33/** 34 * @file 35 * Declaration of the Packet class. 36 */ 37 38#ifndef __MEM_PACKET_HH__ 39#define __MEM_PACKET_HH__ 40 41#include <cassert> 42#include <list> 43#include <bitset> 44
|
45#include "base/cast.hh" |
46#include "base/compiler.hh" 47#include "base/fast_alloc.hh"
|
48#include "base/flags.hh" |
49#include "base/misc.hh" 50#include "base/printable.hh" 51#include "mem/request.hh" 52#include "sim/host.hh" 53#include "sim/core.hh" 54 55 56struct Packet; 57typedef Packet *PacketPtr; 58typedef uint8_t* PacketDataPtr; 59typedef std::list<PacketPtr> PacketList; 60 61class MemCmd 62{
|
61 public:
|
63 friend class Packet; |
64
|
63 /** List of all commands associated with a packet. */
|
65 public: 66 /** 67 * List of all commands associated with a packet. 68 */ |
69 enum Command 70 { 71 InvalidCmd, 72 ReadReq, 73 ReadResp, 74 ReadRespWithInvalidate, 75 WriteReq, 76 WriteResp, 77 Writeback, 78 SoftPFReq, 79 HardPFReq, 80 SoftPFResp, 81 HardPFResp, 82 WriteInvalidateReq, 83 WriteInvalidateResp, 84 UpgradeReq, 85 UpgradeResp, 86 ReadExReq, 87 ReadExResp, 88 LoadLockedReq, 89 StoreCondReq, 90 StoreCondResp, 91 SwapReq, 92 SwapResp, 93 MessageReq, 94 MessageResp, 95 // Error responses 96 // @TODO these should be classified as responses rather than 97 // requests; coding them as requests initially for backwards 98 // compatibility 99 NetworkNackError, // nacked at network layer (not by protocol) 100 InvalidDestError, // packet dest field invalid 101 BadAddressError, // memory address invalid 102 // Fake simulator-only commands 103 PrintReq, // Print state matching address 104 NUM_MEM_CMDS 105 }; 106 107 private:
|
103 /** List of command attributes. */
|
108 /** 109 * List of command attributes. 110 */ |
111 enum Attribute 112 { 113 IsRead, //!< Data flows from responder to requester 114 IsWrite, //!< Data flows from requester to responder 115 IsPrefetch, //!< Not a demand access 116 IsInvalidate, 117 NeedsExclusive, //!< Requires exclusive copy to complete in-cache 118 IsRequest, //!< Issued by requester 119 IsResponse, //!< Issue by responder 120 NeedsResponse, //!< Requester needs response from target 121 IsSWPrefetch, 122 IsHWPrefetch, 123 IsLocked, //!< Alpha/MIPS LL or SC access 124 HasData, //!< There is an associated payload 125 IsError, //!< Error response 126 IsPrint, //!< Print state matching address (for debugging) 127 NUM_COMMAND_ATTRIBUTES 128 }; 129
|
123 /** Structure that defines attributes and other data associated
124 * with a Command. */
125 struct CommandInfo {
126 /** Set of attribute flags. */
|
130 /** 131 * Structure that defines attributes and other data associated 132 * with a Command. 133 */ 134 struct CommandInfo 135 { 136 /// Set of attribute flags. |
137 const std::bitset<NUM_COMMAND_ATTRIBUTES> attributes;
|
128 /** Corresponding response for requests; InvalidCmd if no
129 * response is applicable. */
|
138 /// Corresponding response for requests; InvalidCmd if no 139 /// response is applicable. |
140 const Command response;
|
131 /** String representation (for printing) */
|
141 /// String representation (for printing) |
142 const std::string str; 143 }; 144
|
135 /** Array to map Command enum to associated info. */
|
145 /// Array to map Command enum to associated info. |
146 static const CommandInfo commandInfo[]; 147 148 private: 149 150 Command cmd; 151
|
142 bool testCmdAttrib(MemCmd::Attribute attrib) const {
|
152 bool 153 testCmdAttrib(MemCmd::Attribute attrib) const 154 { |
155 return commandInfo[cmd].attributes[attrib] != 0; 156 } 157 158 public: 159 160 bool isRead() const { return testCmdAttrib(IsRead); } 161 bool isWrite() const { return testCmdAttrib(IsWrite); } 162 bool isRequest() const { return testCmdAttrib(IsRequest); } 163 bool isResponse() const { return testCmdAttrib(IsResponse); } 164 bool needsExclusive() const { return testCmdAttrib(NeedsExclusive); } 165 bool needsResponse() const { return testCmdAttrib(NeedsResponse); } 166 bool isInvalidate() const { return testCmdAttrib(IsInvalidate); } 167 bool hasData() const { return testCmdAttrib(HasData); } 168 bool isReadWrite() const { return isRead() && isWrite(); } 169 bool isLocked() const { return testCmdAttrib(IsLocked); } 170 bool isError() const { return testCmdAttrib(IsError); } 171 bool isPrint() const { return testCmdAttrib(IsPrint); } 172
|
161 const Command responseCommand() const {
|
173 const Command 174 responseCommand() const 175 { |
176 return commandInfo[cmd].response; 177 } 178
|
165 /** Return the string to a cmd given by idx. */
166 const std::string &toString() const {
167 return commandInfo[cmd].str;
168 }
169
|
179 /// Return the string to a cmd given by idx. 180 const std::string &toString() const { return commandInfo[cmd].str; } |
181 int toInt() const { return (int)cmd; } 182
|
172 MemCmd(Command _cmd)
173 : cmd(_cmd)
174 { }
|
183 MemCmd(Command _cmd) : cmd(_cmd) { } 184 MemCmd(int _cmd) : cmd((Command)_cmd) { } 185 MemCmd() : cmd(InvalidCmd) { } |
186
|
176 MemCmd(int _cmd)
177 : cmd((Command)_cmd)
178 { }
179
180 MemCmd()
181 : cmd(InvalidCmd)
182 { }
183
184 bool operator==(MemCmd c2) { return (cmd == c2.cmd); }
185 bool operator!=(MemCmd c2) { return (cmd != c2.cmd); }
186
187 friend class Packet;
|
187 bool operator==(MemCmd c2) const { return (cmd == c2.cmd); } 188 bool operator!=(MemCmd c2) const { return (cmd != c2.cmd); } |
189}; 190 191/** 192 * A Packet is used to encapsulate a transfer between two objects in 193 * the memory system (e.g., the L1 and L2 cache). (In contrast, a 194 * single Request travels all the way from the requester to the 195 * ultimate destination and back, possibly being conveyed by several 196 * different Packets along the way.) 197 */ 198class Packet : public FastAlloc, public Printable 199{ 200 public:
|
201 typedef uint32_t FlagsType; 202 typedef ::Flags<FlagsType> Flags; 203 typedef short NodeID; |
204
|
205 private: 206 static const FlagsType PUBLIC_FLAGS = 0x00000000; 207 static const FlagsType PRIVATE_FLAGS = 0x00007F0F; 208 static const FlagsType COPY_FLAGS = 0x0000000F; 209 210 static const FlagsType SHARED = 0x00000001; 211 // Special control flags 212 /// Special timing-mode atomic snoop for multi-level coherence. 213 static const FlagsType EXPRESS_SNOOP = 0x00000002; 214 /// Does supplier have exclusive copy? 215 /// Useful for multi-level coherence. 216 static const FlagsType SUPPLY_EXCLUSIVE = 0x00000004; 217 // Snoop response flags 218 static const FlagsType MEM_INHIBIT = 0x00000008; 219 /// Are the 'addr' and 'size' fields valid? 220 static const FlagsType VALID_ADDR = 0x00000100; 221 static const FlagsType VALID_SIZE = 0x00000200; 222 /// Is the 'src' field valid? 223 static const FlagsType VALID_SRC = 0x00000400; 224 static const FlagsType VALID_DST = 0x00000800; 225 /// Is the data pointer set to a value that shouldn't be freed 226 /// when the packet is destroyed? 227 static const FlagsType STATIC_DATA = 0x00001000; 228 /// The data pointer points to a value that should be freed when 229 /// the packet is destroyed. 230 static const FlagsType DYNAMIC_DATA = 0x00002000; 231 /// the data pointer points to an array (thus delete []) needs to 232 /// be called on it rather than simply delete. 233 static const FlagsType ARRAY_DATA = 0x00004000; 234 235 Flags flags; 236 237 public: |
238 typedef MemCmd::Command Command; 239
|
203 /** The command field of the packet. */
|
240 /// The command field of the packet. |
241 MemCmd cmd; 242
|
206 /** A pointer to the original request. */
|
243 /// A pointer to the original request. |
244 RequestPtr req; 245 246 private:
|
210 /** A pointer to the data being transfered. It can be differnt
211 * sizes at each level of the heirarchy so it belongs in the
212 * packet, not request. This may or may not be populated when a
213 * responder recieves the packet. If not populated it memory
214 * should be allocated.
|
247 /** 248 * A pointer to the data being transfered. It can be differnt 249 * sizes at each level of the heirarchy so it belongs in the 250 * packet, not request. This may or may not be populated when a 251 * responder recieves the packet. If not populated it memory should 252 * be allocated. |
253 */ 254 PacketDataPtr data; 255
|
218 /** Is the data pointer set to a value that shouldn't be freed
219 * when the packet is destroyed? */
220 bool staticData;
221 /** The data pointer points to a value that should be freed when
222 * the packet is destroyed. */
223 bool dynamicData;
224 /** the data pointer points to an array (thus delete [] ) needs to
225 * be called on it rather than simply delete.*/
226 bool arrayData;
227
228 /** The address of the request. This address could be virtual or
229 * physical, depending on the system configuration. */
|
256 /// The address of the request. This address could be virtual or 257 /// physical, depending on the system configuration. |
258 Addr addr; 259
|
232 /** The size of the request or transfer. */
|
260 /// The size of the request or transfer. |
261 int size; 262
|
235 /** Device address (e.g., bus ID) of the source of the
236 * transaction. The source is not responsible for setting this
237 * field; it is set implicitly by the interconnect when the
238 * packet is first sent. */
239 short src;
|
263 /** 264 * Device address (e.g., bus ID) of the source of the 265 * transaction. The source is not responsible for setting this 266 * field; it is set implicitly by the interconnect when the packet 267 * is first sent. 268 */ 269 NodeID src; |
270
|
241 /** Device address (e.g., bus ID) of the destination of the
242 * transaction. The special value Broadcast indicates that the
243 * packet should be routed based on its address. This field is
244 * initialized in the constructor and is thus always valid
245 * (unlike * addr, size, and src). */
246 short dest;
|
271 /** 272 * Device address (e.g., bus ID) of the destination of the 273 * transaction. The special value Broadcast indicates that the 274 * packet should be routed based on its address. This field is 275 * initialized in the constructor and is thus always valid (unlike 276 * addr, size, and src). 277 */ 278 NodeID dest; |
279
|
248 /** The original value of the command field. Only valid when the
|
280 /** 281 * The original value of the command field. Only valid when the |
282 * current command field is an error condition; in that case, the 283 * previous contents of the command field are copied here. This 284 * field is *not* set on non-error responses. 285 */ 286 MemCmd origCmd; 287
|
255 /** Are the 'addr' and 'size' fields valid? */
256 bool addrSizeValid;
257 /** Is the 'src' field valid? */
258 bool srcValid;
259 bool destValid;
260
261 enum Flag {
262 // Snoop response flags
263 MemInhibit,
264 Shared,
265 // Special control flags
266 /// Special timing-mode atomic snoop for multi-level coherence.
267 ExpressSnoop,
268 /// Does supplier have exclusive copy?
269 /// Useful for multi-level coherence.
270 SupplyExclusive,
271 NUM_PACKET_FLAGS
272 };
273
274 /** Status flags */
275 std::bitset<NUM_PACKET_FLAGS> flags;
276
|
288 public:
|
278
279 /** Used to calculate latencies for each packet.*/
|
289 /// Used to calculate latencies for each packet. |
290 Tick time; 291
|
282 /** The time at which the packet will be fully transmitted */
|
292 /// The time at which the packet will be fully transmitted |
293 Tick finishTime; 294
|
285 /** The time at which the first chunk of the packet will be transmitted */
|
295 /// The time at which the first chunk of the packet will be transmitted |
296 Tick firstWordTime; 297
|
288 /** The special destination address indicating that the packet
289 * should be routed based on its address. */
290 static const short Broadcast = -1;
|
298 /// The special destination address indicating that the packet 299 /// should be routed based on its address. 300 static const NodeID Broadcast = -1; |
301
|
292 /** A virtual base opaque structure used to hold state associated
293 * with the packet but specific to the sending device (e.g., an
294 * MSHR). A pointer to this state is returned in the packet's
295 * response so that the sender can quickly look up the state
296 * needed to process it. A specific subclass would be derived
297 * from this to carry state specific to a particular sending
298 * device. */
299 class SenderState {
300 public:
|
302 /** 303 * A virtual base opaque structure used to hold state associated 304 * with the packet but specific to the sending device (e.g., an 305 * MSHR). A pointer to this state is returned in the packet's 306 * response so that the sender can quickly look up the state 307 * needed to process it. A specific subclass would be derived 308 * from this to carry state specific to a particular sending 309 * device. 310 */ 311 struct SenderState 312 { |
313 virtual ~SenderState() {} 314 }; 315 316 /** 317 * Object used to maintain state of a PrintReq. The senderState 318 * field of a PrintReq should always be of this type. 319 */
|
308 class PrintReqState : public SenderState, public FastAlloc {
309 /** An entry in the label stack. */
310 class LabelStackEntry {
311 public:
|
320 class PrintReqState : public SenderState, public FastAlloc 321 { 322 private: 323 /** 324 * An entry in the label stack. 325 */ 326 struct LabelStackEntry 327 { |
328 const std::string label; 329 std::string *prefix; 330 bool labelPrinted;
|
315 LabelStackEntry(const std::string &_label,
316 std::string *_prefix);
|
331 LabelStackEntry(const std::string &_label, std::string *_prefix); |
332 }; 333 334 typedef std::list<LabelStackEntry> LabelStack; 335 LabelStack labelStack; 336 337 std::string *curPrefixPtr; 338 339 public: 340 std::ostream &os; 341 const int verbosity; 342 343 PrintReqState(std::ostream &os, int verbosity = 0); 344 ~PrintReqState(); 345
|
331 /** Returns the current line prefix. */
|
346 /** 347 * Returns the current line prefix. 348 */ |
349 const std::string &curPrefix() { return *curPrefixPtr; } 350
|
334 /** Push a label onto the label stack, and prepend the given
|
351 /** 352 * Push a label onto the label stack, and prepend the given |
353 * prefix string onto the current prefix. Labels will only be
|
336 * printed if an object within the label's scope is
337 * printed. */
|
354 * printed if an object within the label's scope is printed. 355 */ |
356 void pushLabel(const std::string &lbl, 357 const std::string &prefix = " ");
|
340 /** Pop a label off the label stack. */
|
358 359 /** 360 * Pop a label off the label stack. 361 */ |
362 void popLabel();
|
342 /** Print all of the pending unprinted labels on the
|
363 364 /** 365 * Print all of the pending unprinted labels on the |
366 * stack. Called by printObj(), so normally not called by
|
344 * users unless bypassing printObj(). */
|
367 * users unless bypassing printObj(). 368 */ |
369 void printLabels();
|
346 /** Print a Printable object to os, because it matched the
347 * address on a PrintReq. */
|
370 371 /** 372 * Print a Printable object to os, because it matched the 373 * address on a PrintReq. 374 */ |
375 void printObj(Printable *obj); 376 }; 377
|
351 /** This packet's sender state. Devices should use dynamic_cast<>
352 * to cast to the state appropriate to the sender. */
|
378 /** 379 * This packet's sender state. Devices should use dynamic_cast<> 380 * to cast to the state appropriate to the sender. The intent of 381 * this variable is to allow a device to attach extra information 382 * to a request. A response packet must return the sender state 383 * that was attached to the original request (even if a new packet 384 * is created). 385 */ |
386 SenderState *senderState; 387
|
355 /** Return the string name of the cmd field (for debugging and
356 * tracing). */
|
388 /// Return the string name of the cmd field (for debugging and 389 /// tracing). |
390 const std::string &cmdString() const { return cmd.toString(); } 391
|
359 /** Return the index of this command. */
|
392 /// Return the index of this command. |
393 inline int cmdToIndex() const { return cmd.toInt(); } 394 395 bool isRead() const { return cmd.isRead(); } 396 bool isWrite() const { return cmd.isWrite(); } 397 bool isRequest() const { return cmd.isRequest(); } 398 bool isResponse() const { return cmd.isResponse(); } 399 bool needsExclusive() const { return cmd.needsExclusive(); } 400 bool needsResponse() const { return cmd.needsResponse(); } 401 bool isInvalidate() const { return cmd.isInvalidate(); } 402 bool hasData() const { return cmd.hasData(); } 403 bool isReadWrite() const { return cmd.isReadWrite(); } 404 bool isLocked() const { return cmd.isLocked(); } 405 bool isError() const { return cmd.isError(); } 406 bool isPrint() const { return cmd.isPrint(); } 407 408 // Snoop flags
|
376 void assertMemInhibit() { flags[MemInhibit] = true; }
377 bool memInhibitAsserted() { return flags[MemInhibit]; }
378 void assertShared() { flags[Shared] = true; }
379 bool sharedAsserted() { return flags[Shared]; }
|
409 void assertMemInhibit() { flags.set(MEM_INHIBIT); } 410 bool memInhibitAsserted() { return flags.any(MEM_INHIBIT); } 411 void assertShared() { flags.set(SHARED); } 412 bool sharedAsserted() { return flags.any(SHARED); } |
413 414 // Special control flags
|
382 void setExpressSnoop() { flags[ExpressSnoop] = true; }
383 bool isExpressSnoop() { return flags[ExpressSnoop]; }
384 void setSupplyExclusive() { flags[SupplyExclusive] = true; }
385 bool isSupplyExclusive() { return flags[SupplyExclusive]; }
|
415 void setExpressSnoop() { flags.set(EXPRESS_SNOOP); } 416 bool isExpressSnoop() { return flags.any(EXPRESS_SNOOP); } 417 void setSupplyExclusive() { flags.set(SUPPLY_EXCLUSIVE); } 418 bool isSupplyExclusive() { return flags.any(SUPPLY_EXCLUSIVE); } |
419 420 // Network error conditions... encapsulate them as methods since 421 // their encoding keeps changing (from result field to command 422 // field, etc.)
|
390 void setNacked() { assert(isResponse()); cmd = MemCmd::NetworkNackError; }
391 void setBadAddress() { assert(isResponse()); cmd = MemCmd::BadAddressError; }
392 bool wasNacked() { return cmd == MemCmd::NetworkNackError; }
393 bool hadBadAddress() { return cmd == MemCmd::BadAddressError; }
394 void copyError(Packet *pkt) { assert(pkt->isError()); cmd = pkt->cmd; }
|
423 void 424 setNacked() 425 { 426 assert(isResponse()); 427 cmd = MemCmd::NetworkNackError; 428 } |
429
|
396 bool nic_pkt() { panic("Unimplemented"); M5_DUMMY_RETURN }
|
430 void 431 setBadAddress() 432 { 433 assert(isResponse()); 434 cmd = MemCmd::BadAddressError; 435 } |
436
|
398 /** Accessor function that returns the source index of the packet. */
399 short getSrc() const { assert(srcValid); return src; }
400 void setSrc(short _src) { src = _src; srcValid = true; }
401 /** Reset source field, e.g. to retransmit packet on different bus. */
402 void clearSrc() { srcValid = false; }
|
437 bool wasNacked() const { return cmd == MemCmd::NetworkNackError; } 438 bool hadBadAddress() const { return cmd == MemCmd::BadAddressError; } 439 void copyError(Packet *pkt) { assert(pkt->isError()); cmd = pkt->cmd; } |
440
|
404 /** Accessor function that returns the destination index of
405 the packet. */
406 short getDest() const { assert(destValid); return dest; }
407 void setDest(short _dest) { dest = _dest; destValid = true; }
|
441 /// Accessor function to get the source index of the packet. 442 NodeID getSrc() const { assert(flags.any(VALID_SRC)); return src; } 443 /// Accessor function to set the source index of the packet. 444 void setSrc(NodeID _src) { src = _src; flags.set(VALID_SRC); } 445 /// Reset source field, e.g. to retransmit packet on different bus. 446 void clearSrc() { flags.clear(VALID_SRC); } |
447
|
409 Addr getAddr() const { assert(addrSizeValid); return addr; }
410 int getSize() const { assert(addrSizeValid); return size; }
411 Addr getOffset(int blkSize) const { return addr & (Addr)(blkSize - 1); }
|
448 /// Accessor function for the destination index of the packet. 449 NodeID getDest() const { assert(flags.any(VALID_DST)); return dest; } 450 /// Accessor function to set the destination index of the packet. 451 void setDest(NodeID _dest) { dest = _dest; flags.set(VALID_DST); } |
452
|
413 /** Constructor. Note that a Request object must be constructed
414 * first, but the Requests's physical address and size fields
415 * need not be valid. The command and destination addresses
416 * must be supplied. */
417 Packet(Request *_req, MemCmd _cmd, short _dest)
418 : cmd(_cmd), req(_req),
419 data(NULL), staticData(false), dynamicData(false), arrayData(false),
420 addr(_req->paddr), size(_req->size), dest(_dest),
421 addrSizeValid(_req->validPaddr), srcValid(false), destValid(true),
422 flags(0), time(curTick), senderState(NULL)
|
453 Addr getAddr() const { assert(flags.all(VALID_ADDR)); return addr; } 454 int getSize() const { assert(flags.all(VALID_SIZE)); return size; } 455 Addr getOffset(int blkSize) const { return getAddr() & (Addr)(blkSize - 1); } 456 457 /** 458 * Constructor. Note that a Request object must be constructed 459 * first, but the Requests's physical address and size fields need 460 * not be valid. The command and destination addresses must be 461 * supplied. 462 */ 463 Packet(Request *_req, MemCmd _cmd, NodeID _dest) 464 : cmd(_cmd), req(_req), data(NULL), addr(_req->paddr), 465 size(_req->size), dest(_dest), time(curTick), senderState(NULL) |
466 { 467 } 468
|
426 /** Alternate constructor if you are trying to create a packet with
427 * a request that is for a whole block, not the address from the req.
428 * this allows for overriding the size/addr of the req.*/
429 Packet(Request *_req, MemCmd _cmd, short _dest, int _blkSize)
430 : cmd(_cmd), req(_req),
431 data(NULL), staticData(false), dynamicData(false), arrayData(false),
|
469 /** 470 * Alternate constructor if you are trying to create a packet with 471 * a request that is for a whole block, not the address from the 472 * req. this allows for overriding the size/addr of the req. 473 */ 474 Packet(Request *_req, MemCmd _cmd, NodeID _dest, int _blkSize) 475 : cmd(_cmd), req(_req), data(NULL), |
476 addr(_req->paddr & ~(_blkSize - 1)), size(_blkSize), dest(_dest),
|
433 addrSizeValid(_req->validPaddr), srcValid(false), destValid(true),
434 flags(0), time(curTick), senderState(NULL)
|
477 time(curTick), senderState(NULL) |
478 { 479 } 480
|
438 /** Alternate constructor for copying a packet. Copy all fields
|
481 /** 482 * Alternate constructor for copying a packet. Copy all fields |
483 * *except* if the original packet's data was dynamic, don't copy 484 * that, as we can't guarantee that the new packet's lifetime is 485 * less than that of the original packet. In this case the new
|
442 * packet should allocate its own data. */
443 Packet(Packet *origPkt, bool clearFlags = false)
444 : cmd(origPkt->cmd), req(origPkt->req),
445 data(origPkt->staticData ? origPkt->data : NULL),
446 staticData(origPkt->staticData),
447 dynamicData(false), arrayData(false),
448 addr(origPkt->addr), size(origPkt->size),
449 src(origPkt->src), dest(origPkt->dest),
450 addrSizeValid(origPkt->addrSizeValid),
451 srcValid(origPkt->srcValid), destValid(origPkt->destValid),
452 flags(clearFlags ? 0 : origPkt->flags),
453 time(curTick), senderState(origPkt->senderState)
|
486 * packet should allocate its own data. 487 */ 488 Packet(Packet *pkt, bool clearFlags = false) 489 : cmd(pkt->cmd), req(pkt->req), 490 data(pkt->flags.any(STATIC_DATA) ? pkt->data : NULL), 491 addr(pkt->addr), size(pkt->size), src(pkt->src), dest(pkt->dest), 492 time(curTick), senderState(pkt->senderState) |
493 {
|
494 if (!clearFlags) 495 flags.set(pkt->flags & COPY_FLAGS); 496 497 flags.set(pkt->flags & (VALID_ADDR|VALID_SIZE|VALID_SRC|VALID_DST)); 498 flags.set(pkt->flags & STATIC_DATA); |
499 } 500
|
457 /** Destructor. */
|
501 /** 502 * clean up packet variables 503 */ |
504 ~Packet() 505 { 506 // If this is a request packet for which there's no response, 507 // delete the request object here, since the requester will 508 // never get the chance. 509 if (req && isRequest() && !needsResponse()) 510 delete req;
|
465 if (staticData || dynamicData)
466 deleteData();
|
511 deleteData(); |
512 } 513
|
469 /** Reinitialize packet address and size from the associated
470 * Request object, and reset other fields that may have been
471 * modified by a previous transaction. Typically called when a
472 * statically allocated Request/Packet pair is reused for
473 * multiple transactions. */
474 void reinitFromRequest() {
475 assert(req->validPaddr);
|
514 /** 515 * Reinitialize packet address and size from the associated 516 * Request object, and reset other fields that may have been 517 * modified by a previous transaction. Typically called when a 518 * statically allocated Request/Packet pair is reused for multiple 519 * transactions. 520 */ 521 void 522 reinitFromRequest() 523 { 524 assert(req->flags.any(Request::VALID_PADDR)); |
525 flags = 0; 526 addr = req->paddr; 527 size = req->size; 528 time = req->time;
|
480 addrSizeValid = true;
481 if (dynamicData) {
482 deleteData();
483 dynamicData = false;
484 arrayData = false;
485 }
|
529 530 flags.set(VALID_ADDR|VALID_SIZE); 531 deleteData(); |
532 } 533 534 /** 535 * Take a request packet and modify it in place to be suitable for 536 * returning as a response to that request. The source and 537 * destination fields are *not* modified, as is appropriate for 538 * atomic accesses. 539 */
|
494 void makeResponse()
|
540 void 541 makeResponse() |
542 { 543 assert(needsResponse()); 544 assert(isRequest()); 545 origCmd = cmd; 546 cmd = cmd.responseCommand();
|
500 dest = src;
501 destValid = srcValid;
502 srcValid = false;
|
547 if (flags.any(VALID_SRC)) { 548 dest = src; 549 flags.set(VALID_DST); 550 flags.clear(VALID_SRC); 551 } else { 552 flags.clear(VALID_DST); 553 } |
554 } 555
|
505 void makeAtomicResponse()
|
556 void 557 makeAtomicResponse() |
558 { 559 makeResponse(); 560 } 561
|
510 void makeTimingResponse()
|
562 void 563 makeTimingResponse() |
564 { 565 makeResponse(); 566 } 567 568 /** 569 * Take a request packet that has been returned as NACKED and 570 * modify it so that it can be sent out again. Only packets that 571 * need a response can be NACKED, so verify that that is true. 572 */ 573 void 574 reinitNacked() 575 { 576 assert(wasNacked()); 577 cmd = origCmd; 578 assert(needsResponse()); 579 setDest(Broadcast); 580 } 581 582 583 /** 584 * Set the data pointer to the following value that should not be 585 * freed. 586 */ 587 template <typename T> 588 void 589 dataStatic(T *p) 590 {
|
538 if(dynamicData)
539 dynamicData = false;
|
591 assert(flags.none(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA)); |
592 data = (PacketDataPtr)p;
|
541 staticData = true;
|
593 flags.set(STATIC_DATA); |
594 } 595 596 /** 597 * Set the data pointer to a value that should have delete [] 598 * called on it. 599 */ 600 template <typename T> 601 void 602 dataDynamicArray(T *p) 603 {
|
552 assert(!staticData && !dynamicData);
|
604 assert(flags.none(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA)); |
605 data = (PacketDataPtr)p;
|
554 dynamicData = true;
555 arrayData = true;
|
606 flags.set(DYNAMIC_DATA|ARRAY_DATA); |
607 } 608 609 /** 610 * set the data pointer to a value that should have delete called 611 * on it. 612 */ 613 template <typename T> 614 void 615 dataDynamic(T *p) 616 {
|
566 assert(!staticData && !dynamicData);
|
617 assert(flags.none(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA)); |
618 data = (PacketDataPtr)p;
|
568 dynamicData = true;
569 arrayData = false;
|
619 flags.set(DYNAMIC_DATA); |
620 } 621
|
572 /** get a pointer to the data ptr. */
|
622 /** 623 * get a pointer to the data ptr. 624 */ |
625 template <typename T> 626 T* 627 getPtr() 628 {
|
577 assert(staticData || dynamicData);
|
629 assert(flags.any(STATIC_DATA|DYNAMIC_DATA)); |
630 return (T*)data; 631 } 632
|
581 /** return the value of what is pointed to in the packet. */
|
633 /** 634 * return the value of what is pointed to in the packet. 635 */ |
636 template <typename T> 637 T get(); 638
|
585 /** set the value in the data pointer to v. */
|
639 /** 640 * set the value in the data pointer to v. 641 */ |
642 template <typename T> 643 void set(T v); 644 645 /** 646 * Copy data into the packet from the provided pointer. 647 */
|
592 void setData(uint8_t *p)
|
648 void 649 setData(uint8_t *p) |
650 { 651 std::memcpy(getPtr<uint8_t>(), p, getSize()); 652 } 653 654 /** 655 * Copy data into the packet from the provided block pointer, 656 * which is aligned to the given block size. 657 */
|
601 void setDataFromBlock(uint8_t *blk_data, int blkSize)
|
658 void 659 setDataFromBlock(uint8_t *blk_data, int blkSize) |
660 { 661 setData(blk_data + getOffset(blkSize)); 662 } 663 664 /** 665 * Copy data from the packet to the provided block pointer, which 666 * is aligned to the given block size. 667 */
|
610 void writeData(uint8_t *p)
|
668 void 669 writeData(uint8_t *p) |
670 { 671 std::memcpy(p, getPtr<uint8_t>(), getSize()); 672 } 673 674 /** 675 * Copy data from the packet to the memory at the provided pointer. 676 */
|
618 void writeDataToBlock(uint8_t *blk_data, int blkSize)
|
677 void 678 writeDataToBlock(uint8_t *blk_data, int blkSize) |
679 { 680 writeData(blk_data + getOffset(blkSize)); 681 } 682 683 /** 684 * delete the data pointed to in the data pointer. Ok to call to 685 * matter how data was allocted. 686 */
|
627 void deleteData();
|
687 void 688 deleteData() 689 { 690 if (flags.any(ARRAY_DATA)) 691 delete [] data; 692 else if (flags.any(DYNAMIC_DATA)) |
693
|
694 delete data; 695 696 flags.clear(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA); 697 data = NULL; 698 } 699 |
700 /** If there isn't data in the packet, allocate some. */
|
630 void allocate();
|
701 void 702 allocate() 703 { 704 if (data) { 705 assert(flags.none(STATIC_DATA|DYNAMIC_DATA)); 706 } else { 707 flags.set(DYNAMIC_DATA|ARRAY_DATA); 708 data = new uint8_t[getSize()]; 709 } 710 } |
711
|
712 |
713 /** 714 * Check a functional request against a memory value represented 715 * by a base/size pair and an associated data array. If the 716 * functional request is a read, it may be satisfied by the memory 717 * value. If the functional request is a write, it may update the 718 * memory value. 719 */ 720 bool checkFunctional(Printable *obj, Addr base, int size, uint8_t *data); 721 722 /** 723 * Check a functional request against a memory value stored in 724 * another packet (i.e. an in-transit request or response). 725 */
|
645 bool checkFunctional(PacketPtr otherPkt) {
646 return checkFunctional(otherPkt,
647 otherPkt->getAddr(), otherPkt->getSize(),
648 otherPkt->hasData() ?
649 otherPkt->getPtr<uint8_t>() : NULL);
|
726 bool 727 checkFunctional(PacketPtr other) 728 { 729 uint8_t *data = other->hasData() ? other->getPtr<uint8_t>() : NULL; 730 return checkFunctional(other, other->getAddr(), other->getSize(), 731 data); |
732 } 733 734 /** 735 * Push label for PrintReq (safe to call unconditionally). 736 */
|
655 void pushLabel(const std::string &lbl) {
656 if (isPrint()) {
657 dynamic_cast<PrintReqState*>(senderState)->pushLabel(lbl);
658 }
|
737 void 738 pushLabel(const std::string &lbl) 739 { 740 if (isPrint()) 741 safe_cast<PrintReqState*>(senderState)->pushLabel(lbl); |
742 } 743 744 /** 745 * Pop label for PrintReq (safe to call unconditionally). 746 */
|
664 void popLabel() {
665 if (isPrint()) {
666 dynamic_cast<PrintReqState*>(senderState)->popLabel();
667 }
|
747 void 748 popLabel() 749 { 750 if (isPrint()) 751 safe_cast<PrintReqState*>(senderState)->popLabel(); |
752 } 753 754 void print(std::ostream &o, int verbosity = 0, 755 const std::string &prefix = "") const; 756}; 757 758#endif //__MEM_PACKET_HH
|