packet.hh revision 7465:f97b62be544f
1/* 2 * Copyright (c) 2006 The Regents of The University of Michigan 3 * Copyright (c) 2010 Advancec Micro Devices, Inc. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer; 10 * redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution; 13 * neither the name of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Authors: Ron Dreslinski 30 * Steve Reinhardt 31 * Ali Saidi 32 */ 33 34/** 35 * @file 36 * Declaration of the Packet class. 37 */ 38 39#ifndef __MEM_PACKET_HH__ 40#define __MEM_PACKET_HH__ 41 42#include <cassert> 43#include <list> 44#include <bitset> 45 46#include "base/cast.hh" 47#include "base/compiler.hh" 48#include "base/fast_alloc.hh" 49#include "base/flags.hh" 50#include "base/misc.hh" 51#include "base/printable.hh" 52#include "base/types.hh" 53#include "mem/request.hh" 54#include "sim/core.hh" 55 56struct Packet; 57typedef Packet *PacketPtr; 58typedef uint8_t* PacketDataPtr; 59typedef std::list<PacketPtr> PacketList; 60 61class MemCmd 62{ 63 friend class Packet; 64 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 SCUpgradeReq, // Special "weak" upgrade for StoreCond 86 UpgradeResp, 87 SCUpgradeFailReq, // Failed SCUpgradeReq in MSHR (never sent) 88 UpgradeFailResp, // Valid for SCUpgradeReq only 89 ReadExReq, 90 ReadExResp, 91 LoadLockedReq, 92 StoreCondReq, 93 StoreCondResp, 94 SwapReq, 95 SwapResp, 96 MessageReq, 97 MessageResp, 98 // Error responses 99 // @TODO these should be classified as responses rather than 100 // requests; coding them as requests initially for backwards 101 // compatibility 102 NetworkNackError, // nacked at network layer (not by protocol) 103 InvalidDestError, // packet dest field invalid 104 BadAddressError, // memory address invalid 105 // Fake simulator-only commands 106 PrintReq, // Print state matching address 107 NUM_MEM_CMDS 108 }; 109 110 private: 111 /** 112 * List of command attributes. 113 */ 114 enum Attribute 115 { 116 IsRead, //!< Data flows from responder to requester 117 IsWrite, //!< Data flows from requester to responder 118 IsUpgrade, 119 IsPrefetch, //!< Not a demand access 120 IsInvalidate, 121 NeedsExclusive, //!< Requires exclusive copy to complete in-cache 122 IsRequest, //!< Issued by requester 123 IsResponse, //!< Issue by responder 124 NeedsResponse, //!< Requester needs response from target 125 IsSWPrefetch, 126 IsHWPrefetch, 127 IsLlsc, //!< Alpha/MIPS LL or SC access 128 HasData, //!< There is an associated payload 129 IsError, //!< Error response 130 IsPrint, //!< Print state matching address (for debugging) 131 NUM_COMMAND_ATTRIBUTES 132 }; 133 134 /** 135 * Structure that defines attributes and other data associated 136 * with a Command. 137 */ 138 struct CommandInfo 139 { 140 /// Set of attribute flags. 141 const std::bitset<NUM_COMMAND_ATTRIBUTES> attributes; 142 /// Corresponding response for requests; InvalidCmd if no 143 /// response is applicable. 144 const Command response; 145 /// String representation (for printing) 146 const std::string str; 147 }; 148 149 /// Array to map Command enum to associated info. 150 static const CommandInfo commandInfo[]; 151 152 private: 153 154 Command cmd; 155 156 bool 157 testCmdAttrib(MemCmd::Attribute attrib) const 158 { 159 return commandInfo[cmd].attributes[attrib] != 0; 160 } 161 162 public: 163 164 bool isRead() const { return testCmdAttrib(IsRead); } 165 bool isWrite() const { return testCmdAttrib(IsWrite); } 166 bool isUpgrade() const { return testCmdAttrib(IsUpgrade); } 167 bool isRequest() const { return testCmdAttrib(IsRequest); } 168 bool isResponse() const { return testCmdAttrib(IsResponse); } 169 bool needsExclusive() const { return testCmdAttrib(NeedsExclusive); } 170 bool needsResponse() const { return testCmdAttrib(NeedsResponse); } 171 bool isInvalidate() const { return testCmdAttrib(IsInvalidate); } 172 bool hasData() const { return testCmdAttrib(HasData); } 173 bool isReadWrite() const { return isRead() && isWrite(); } 174 bool isLLSC() const { return testCmdAttrib(IsLlsc); } 175 bool isError() const { return testCmdAttrib(IsError); } 176 bool isPrint() const { return testCmdAttrib(IsPrint); } 177 178 const Command 179 responseCommand() const 180 { 181 return commandInfo[cmd].response; 182 } 183 184 /// Return the string to a cmd given by idx. 185 const std::string &toString() const { return commandInfo[cmd].str; } 186 int toInt() const { return (int)cmd; } 187 188 MemCmd(Command _cmd) : cmd(_cmd) { } 189 MemCmd(int _cmd) : cmd((Command)_cmd) { } 190 MemCmd() : cmd(InvalidCmd) { } 191 192 bool operator==(MemCmd c2) const { return (cmd == c2.cmd); } 193 bool operator!=(MemCmd c2) const { return (cmd != c2.cmd); } 194}; 195 196/** 197 * A Packet is used to encapsulate a transfer between two objects in 198 * the memory system (e.g., the L1 and L2 cache). (In contrast, a 199 * single Request travels all the way from the requester to the 200 * ultimate destination and back, possibly being conveyed by several 201 * different Packets along the way.) 202 */ 203class Packet : public FastAlloc, public Printable 204{ 205 public: 206 typedef uint32_t FlagsType; 207 typedef ::Flags<FlagsType> Flags; 208 typedef short NodeID; 209 210 private: 211 static const FlagsType PUBLIC_FLAGS = 0x00000000; 212 static const FlagsType PRIVATE_FLAGS = 0x00007F0F; 213 static const FlagsType COPY_FLAGS = 0x0000000F; 214 215 static const FlagsType SHARED = 0x00000001; 216 // Special control flags 217 /// Special timing-mode atomic snoop for multi-level coherence. 218 static const FlagsType EXPRESS_SNOOP = 0x00000002; 219 /// Does supplier have exclusive copy? 220 /// Useful for multi-level coherence. 221 static const FlagsType SUPPLY_EXCLUSIVE = 0x00000004; 222 // Snoop response flags 223 static const FlagsType MEM_INHIBIT = 0x00000008; 224 /// Are the 'addr' and 'size' fields valid? 225 static const FlagsType VALID_ADDR = 0x00000100; 226 static const FlagsType VALID_SIZE = 0x00000200; 227 /// Is the 'src' field valid? 228 static const FlagsType VALID_SRC = 0x00000400; 229 static const FlagsType VALID_DST = 0x00000800; 230 /// Is the data pointer set to a value that shouldn't be freed 231 /// when the packet is destroyed? 232 static const FlagsType STATIC_DATA = 0x00001000; 233 /// The data pointer points to a value that should be freed when 234 /// the packet is destroyed. 235 static const FlagsType DYNAMIC_DATA = 0x00002000; 236 /// the data pointer points to an array (thus delete []) needs to 237 /// be called on it rather than simply delete. 238 static const FlagsType ARRAY_DATA = 0x00004000; 239 240 Flags flags; 241 242 public: 243 typedef MemCmd::Command Command; 244 245 /// The command field of the packet. 246 MemCmd cmd; 247 248 /// A pointer to the original request. 249 RequestPtr req; 250 251 private: 252 /** 253 * A pointer to the data being transfered. It can be differnt 254 * sizes at each level of the heirarchy so it belongs in the 255 * packet, not request. This may or may not be populated when a 256 * responder recieves the packet. If not populated it memory should 257 * be allocated. 258 */ 259 PacketDataPtr data; 260 261 /// The address of the request. This address could be virtual or 262 /// physical, depending on the system configuration. 263 Addr addr; 264 265 /// The size of the request or transfer. 266 unsigned size; 267 268 /** 269 * Device address (e.g., bus ID) of the source of the 270 * transaction. The source is not responsible for setting this 271 * field; it is set implicitly by the interconnect when the packet 272 * is first sent. 273 */ 274 NodeID src; 275 276 /** 277 * Device address (e.g., bus ID) of the destination of the 278 * transaction. The special value Broadcast indicates that the 279 * packet should be routed based on its address. This field is 280 * initialized in the constructor and is thus always valid (unlike 281 * addr, size, and src). 282 */ 283 NodeID dest; 284 285 /** 286 * The original value of the command field. Only valid when the 287 * current command field is an error condition; in that case, the 288 * previous contents of the command field are copied here. This 289 * field is *not* set on non-error responses. 290 */ 291 MemCmd origCmd; 292 293 public: 294 /// Used to calculate latencies for each packet. 295 Tick time; 296 297 /// The time at which the packet will be fully transmitted 298 Tick finishTime; 299 300 /// The time at which the first chunk of the packet will be transmitted 301 Tick firstWordTime; 302 303 /// The special destination address indicating that the packet 304 /// should be routed based on its address. 305 static const NodeID Broadcast = -1; 306 307 /** 308 * A virtual base opaque structure used to hold state associated 309 * with the packet but specific to the sending device (e.g., an 310 * MSHR). A pointer to this state is returned in the packet's 311 * response so that the sender can quickly look up the state 312 * needed to process it. A specific subclass would be derived 313 * from this to carry state specific to a particular sending 314 * device. 315 */ 316 struct SenderState 317 { 318 virtual ~SenderState() {} 319 }; 320 321 /** 322 * Object used to maintain state of a PrintReq. The senderState 323 * field of a PrintReq should always be of this type. 324 */ 325 class PrintReqState : public SenderState, public FastAlloc 326 { 327 private: 328 /** 329 * An entry in the label stack. 330 */ 331 struct LabelStackEntry 332 { 333 const std::string label; 334 std::string *prefix; 335 bool labelPrinted; 336 LabelStackEntry(const std::string &_label, std::string *_prefix); 337 }; 338 339 typedef std::list<LabelStackEntry> LabelStack; 340 LabelStack labelStack; 341 342 std::string *curPrefixPtr; 343 344 public: 345 std::ostream &os; 346 const int verbosity; 347 348 PrintReqState(std::ostream &os, int verbosity = 0); 349 ~PrintReqState(); 350 351 /** 352 * Returns the current line prefix. 353 */ 354 const std::string &curPrefix() { return *curPrefixPtr; } 355 356 /** 357 * Push a label onto the label stack, and prepend the given 358 * prefix string onto the current prefix. Labels will only be 359 * printed if an object within the label's scope is printed. 360 */ 361 void pushLabel(const std::string &lbl, 362 const std::string &prefix = " "); 363 364 /** 365 * Pop a label off the label stack. 366 */ 367 void popLabel(); 368 369 /** 370 * Print all of the pending unprinted labels on the 371 * stack. Called by printObj(), so normally not called by 372 * users unless bypassing printObj(). 373 */ 374 void printLabels(); 375 376 /** 377 * Print a Printable object to os, because it matched the 378 * address on a PrintReq. 379 */ 380 void printObj(Printable *obj); 381 }; 382 383 /** 384 * This packet's sender state. Devices should use dynamic_cast<> 385 * to cast to the state appropriate to the sender. The intent of 386 * this variable is to allow a device to attach extra information 387 * to a request. A response packet must return the sender state 388 * that was attached to the original request (even if a new packet 389 * is created). 390 */ 391 SenderState *senderState; 392 393 /// Return the string name of the cmd field (for debugging and 394 /// tracing). 395 const std::string &cmdString() const { return cmd.toString(); } 396 397 /// Return the index of this command. 398 inline int cmdToIndex() const { return cmd.toInt(); } 399 400 bool isRead() const { return cmd.isRead(); } 401 bool isWrite() const { return cmd.isWrite(); } 402 bool isUpgrade() const { return cmd.isUpgrade(); } 403 bool isRequest() const { return cmd.isRequest(); } 404 bool isResponse() const { return cmd.isResponse(); } 405 bool needsExclusive() const { return cmd.needsExclusive(); } 406 bool needsResponse() const { return cmd.needsResponse(); } 407 bool isInvalidate() const { return cmd.isInvalidate(); } 408 bool hasData() const { return cmd.hasData(); } 409 bool isReadWrite() const { return cmd.isReadWrite(); } 410 bool isLLSC() const { return cmd.isLLSC(); } 411 bool isError() const { return cmd.isError(); } 412 bool isPrint() const { return cmd.isPrint(); } 413 414 // Snoop flags 415 void assertMemInhibit() { flags.set(MEM_INHIBIT); } 416 bool memInhibitAsserted() { return flags.isSet(MEM_INHIBIT); } 417 void assertShared() { flags.set(SHARED); } 418 bool sharedAsserted() { return flags.isSet(SHARED); } 419 420 // Special control flags 421 void setExpressSnoop() { flags.set(EXPRESS_SNOOP); } 422 bool isExpressSnoop() { return flags.isSet(EXPRESS_SNOOP); } 423 void setSupplyExclusive() { flags.set(SUPPLY_EXCLUSIVE); } 424 bool isSupplyExclusive() { return flags.isSet(SUPPLY_EXCLUSIVE); } 425 426 // Network error conditions... encapsulate them as methods since 427 // their encoding keeps changing (from result field to command 428 // field, etc.) 429 void 430 setNacked() 431 { 432 assert(isResponse()); 433 cmd = MemCmd::NetworkNackError; 434 } 435 436 void 437 setBadAddress() 438 { 439 assert(isResponse()); 440 cmd = MemCmd::BadAddressError; 441 } 442 443 bool wasNacked() const { return cmd == MemCmd::NetworkNackError; } 444 bool hadBadAddress() const { return cmd == MemCmd::BadAddressError; } 445 void copyError(Packet *pkt) { assert(pkt->isError()); cmd = pkt->cmd; } 446 447 bool isSrcValid() { return flags.isSet(VALID_SRC); } 448 /// Accessor function to get the source index of the packet. 449 NodeID getSrc() const { assert(flags.isSet(VALID_SRC)); return src; } 450 /// Accessor function to set the source index of the packet. 451 void setSrc(NodeID _src) { src = _src; flags.set(VALID_SRC); } 452 /// Reset source field, e.g. to retransmit packet on different bus. 453 void clearSrc() { flags.clear(VALID_SRC); } 454 455 bool isDestValid() { return flags.isSet(VALID_DST); } 456 /// Accessor function for the destination index of the packet. 457 NodeID getDest() const { assert(flags.isSet(VALID_DST)); return dest; } 458 /// Accessor function to set the destination index of the packet. 459 void setDest(NodeID _dest) { dest = _dest; flags.set(VALID_DST); } 460 461 Addr getAddr() const { assert(flags.isSet(VALID_ADDR)); return addr; } 462 unsigned getSize() const { assert(flags.isSet(VALID_SIZE)); return size; } 463 Addr getOffset(int blkSize) const { return getAddr() & (Addr)(blkSize - 1); } 464 465 /** 466 * Constructor. Note that a Request object must be constructed 467 * first, but the Requests's physical address and size fields need 468 * not be valid. The command and destination addresses must be 469 * supplied. 470 */ 471 Packet(Request *_req, MemCmd _cmd, NodeID _dest) 472 : flags(VALID_DST), cmd(_cmd), req(_req), data(NULL), 473 dest(_dest), time(curTick), senderState(NULL) 474 { 475 if (req->hasPaddr()) { 476 addr = req->getPaddr(); 477 flags.set(VALID_ADDR); 478 } 479 if (req->hasSize()) { 480 size = req->getSize(); 481 flags.set(VALID_SIZE); 482 } 483 } 484 485 /** 486 * Alternate constructor if you are trying to create a packet with 487 * a request that is for a whole block, not the address from the 488 * req. this allows for overriding the size/addr of the req. 489 */ 490 Packet(Request *_req, MemCmd _cmd, NodeID _dest, int _blkSize) 491 : flags(VALID_DST), cmd(_cmd), req(_req), data(NULL), 492 dest(_dest), time(curTick), senderState(NULL) 493 { 494 if (req->hasPaddr()) { 495 addr = req->getPaddr() & ~(_blkSize - 1); 496 flags.set(VALID_ADDR); 497 } 498 size = _blkSize; 499 flags.set(VALID_SIZE); 500 } 501 502 /** 503 * Alternate constructor for copying a packet. Copy all fields 504 * *except* if the original packet's data was dynamic, don't copy 505 * that, as we can't guarantee that the new packet's lifetime is 506 * less than that of the original packet. In this case the new 507 * packet should allocate its own data. 508 */ 509 Packet(Packet *pkt, bool clearFlags = false) 510 : cmd(pkt->cmd), req(pkt->req), 511 data(pkt->flags.isSet(STATIC_DATA) ? pkt->data : NULL), 512 addr(pkt->addr), size(pkt->size), src(pkt->src), dest(pkt->dest), 513 time(curTick), senderState(pkt->senderState) 514 { 515 if (!clearFlags) 516 flags.set(pkt->flags & COPY_FLAGS); 517 518 flags.set(pkt->flags & (VALID_ADDR|VALID_SIZE|VALID_SRC|VALID_DST)); 519 flags.set(pkt->flags & STATIC_DATA); 520 } 521 522 /** 523 * clean up packet variables 524 */ 525 ~Packet() 526 { 527 // If this is a request packet for which there's no response, 528 // delete the request object here, since the requester will 529 // never get the chance. 530 if (req && isRequest() && !needsResponse()) 531 delete req; 532 deleteData(); 533 } 534 535 /** 536 * Reinitialize packet address and size from the associated 537 * Request object, and reset other fields that may have been 538 * modified by a previous transaction. Typically called when a 539 * statically allocated Request/Packet pair is reused for multiple 540 * transactions. 541 */ 542 void 543 reinitFromRequest() 544 { 545 assert(req->hasPaddr()); 546 flags = 0; 547 addr = req->getPaddr(); 548 size = req->getSize(); 549 time = req->time(); 550 551 flags.set(VALID_ADDR|VALID_SIZE); 552 deleteData(); 553 } 554 555 /** 556 * Take a request packet and modify it in place to be suitable for 557 * returning as a response to that request. The source and 558 * destination fields are *not* modified, as is appropriate for 559 * atomic accesses. 560 */ 561 void 562 makeResponse() 563 { 564 assert(needsResponse()); 565 assert(isRequest()); 566 origCmd = cmd; 567 cmd = cmd.responseCommand(); 568 569 // responses are never express, even if the snoop that 570 // triggered them was 571 flags.clear(EXPRESS_SNOOP); 572 573 dest = src; 574 flags.set(VALID_DST, flags.isSet(VALID_SRC)); 575 flags.clear(VALID_SRC); 576 } 577 578 void 579 makeAtomicResponse() 580 { 581 makeResponse(); 582 } 583 584 void 585 makeTimingResponse() 586 { 587 makeResponse(); 588 } 589 590 /** 591 * Take a request packet that has been returned as NACKED and 592 * modify it so that it can be sent out again. Only packets that 593 * need a response can be NACKED, so verify that that is true. 594 */ 595 void 596 reinitNacked() 597 { 598 assert(wasNacked()); 599 cmd = origCmd; 600 assert(needsResponse()); 601 setDest(Broadcast); 602 } 603 604 void 605 setSize(unsigned size) 606 { 607 assert(!flags.isSet(VALID_SIZE)); 608 609 this->size = size; 610 flags.set(VALID_SIZE); 611 } 612 613 614 /** 615 * Set the data pointer to the following value that should not be 616 * freed. 617 */ 618 template <typename T> 619 void 620 dataStatic(T *p) 621 { 622 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA)); 623 data = (PacketDataPtr)p; 624 flags.set(STATIC_DATA); 625 } 626 627 /** 628 * Set the data pointer to a value that should have delete [] 629 * called on it. 630 */ 631 template <typename T> 632 void 633 dataDynamicArray(T *p) 634 { 635 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA)); 636 data = (PacketDataPtr)p; 637 flags.set(DYNAMIC_DATA|ARRAY_DATA); 638 } 639 640 /** 641 * set the data pointer to a value that should have delete called 642 * on it. 643 */ 644 template <typename T> 645 void 646 dataDynamic(T *p) 647 { 648 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA)); 649 data = (PacketDataPtr)p; 650 flags.set(DYNAMIC_DATA); 651 } 652 653 /** 654 * get a pointer to the data ptr. 655 */ 656 template <typename T> 657 T* 658 getPtr() 659 { 660 assert(flags.isSet(STATIC_DATA|DYNAMIC_DATA)); 661 return (T*)data; 662 } 663 664 /** 665 * return the value of what is pointed to in the packet. 666 */ 667 template <typename T> 668 T get(); 669 670 /** 671 * set the value in the data pointer to v. 672 */ 673 template <typename T> 674 void set(T v); 675 676 /** 677 * Copy data into the packet from the provided pointer. 678 */ 679 void 680 setData(uint8_t *p) 681 { 682 std::memcpy(getPtr<uint8_t>(), p, getSize()); 683 } 684 685 /** 686 * Copy data into the packet from the provided block pointer, 687 * which is aligned to the given block size. 688 */ 689 void 690 setDataFromBlock(uint8_t *blk_data, int blkSize) 691 { 692 setData(blk_data + getOffset(blkSize)); 693 } 694 695 /** 696 * Copy data from the packet to the provided block pointer, which 697 * is aligned to the given block size. 698 */ 699 void 700 writeData(uint8_t *p) 701 { 702 std::memcpy(p, getPtr<uint8_t>(), getSize()); 703 } 704 705 /** 706 * Copy data from the packet to the memory at the provided pointer. 707 */ 708 void 709 writeDataToBlock(uint8_t *blk_data, int blkSize) 710 { 711 writeData(blk_data + getOffset(blkSize)); 712 } 713 714 /** 715 * delete the data pointed to in the data pointer. Ok to call to 716 * matter how data was allocted. 717 */ 718 void 719 deleteData() 720 { 721 if (flags.isSet(ARRAY_DATA)) 722 delete [] data; 723 else if (flags.isSet(DYNAMIC_DATA)) 724 delete data; 725 726 flags.clear(STATIC_DATA|DYNAMIC_DATA|ARRAY_DATA); 727 data = NULL; 728 } 729 730 /** If there isn't data in the packet, allocate some. */ 731 void 732 allocate() 733 { 734 if (data) { 735 assert(flags.isSet(STATIC_DATA|DYNAMIC_DATA)); 736 return; 737 } 738 739 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA)); 740 flags.set(DYNAMIC_DATA|ARRAY_DATA); 741 data = new uint8_t[getSize()]; 742 } 743 744 745 /** 746 * Check a functional request against a memory value represented 747 * by a base/size pair and an associated data array. If the 748 * functional request is a read, it may be satisfied by the memory 749 * value. If the functional request is a write, it may update the 750 * memory value. 751 */ 752 bool checkFunctional(Printable *obj, Addr base, int size, uint8_t *data); 753 754 /** 755 * Check a functional request against a memory value stored in 756 * another packet (i.e. an in-transit request or response). 757 */ 758 bool 759 checkFunctional(PacketPtr other) 760 { 761 uint8_t *data = other->hasData() ? other->getPtr<uint8_t>() : NULL; 762 return checkFunctional(other, other->getAddr(), other->getSize(), 763 data); 764 } 765 766 /** 767 * Push label for PrintReq (safe to call unconditionally). 768 */ 769 void 770 pushLabel(const std::string &lbl) 771 { 772 if (isPrint()) 773 safe_cast<PrintReqState*>(senderState)->pushLabel(lbl); 774 } 775 776 /** 777 * Pop label for PrintReq (safe to call unconditionally). 778 */ 779 void 780 popLabel() 781 { 782 if (isPrint()) 783 safe_cast<PrintReqState*>(senderState)->popLabel(); 784 } 785 786 void print(std::ostream &o, int verbosity = 0, 787 const std::string &prefix = "") const; 788}; 789 790#endif //__MEM_PACKET_HH 791