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14 * Copyright (c) 2006 The Regents of The University of Michigan
15 * Copyright (c) 2010 Advanced Micro Devices, Inc.
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29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 * Authors: Ron Dreslinski
49 * Declaration of the Packet class.
52 #ifndef __MEM_PACKET_HH__
53 #define __MEM_PACKET_HH__
59 #include "base/cast.hh"
60 #include "base/compiler.hh"
61 #include "base/flags.hh"
62 #include "base/misc.hh"
63 #include "base/printable.hh"
64 #include "base/types.hh"
65 #include "mem/request.hh"
66 #include "sim/core.hh"
69 typedef Packet *PacketPtr;
70 typedef uint8_t* PacketDataPtr;
71 typedef std::list<PacketPtr> PacketList;
79 * List of all commands associated with a packet.
86 ReadRespWithInvalidate,
97 SCUpgradeReq, // Special "weak" upgrade for StoreCond
99 SCUpgradeFailReq, // Failed SCUpgradeReq in MSHR (never sent)
100 UpgradeFailResp, // Valid for SCUpgradeReq only
105 StoreCondFailReq, // Failed StoreCondReq in MSHR (never sent)
112 // @TODO these should be classified as responses rather than
113 // requests; coding them as requests initially for backwards
115 InvalidDestError, // packet dest field invalid
116 BadAddressError, // memory address invalid
117 FunctionalReadError, // unable to fulfill functional read
118 FunctionalWriteError, // unable to fulfill functional write
119 // Fake simulator-only commands
120 PrintReq, // Print state matching address
121 FlushReq, //request for a cache flush
122 InvalidationReq, // request for address to be invalidated from lsq
128 * List of command attributes.
132 IsRead, //!< Data flows from responder to requester
133 IsWrite, //!< Data flows from requester to responder
136 NeedsExclusive, //!< Requires exclusive copy to complete in-cache
137 IsRequest, //!< Issued by requester
138 IsResponse, //!< Issue by responder
139 NeedsResponse, //!< Requester needs response from target
142 IsLlsc, //!< Alpha/MIPS LL or SC access
143 HasData, //!< There is an associated payload
144 IsError, //!< Error response
145 IsPrint, //!< Print state matching address (for debugging)
146 IsFlush, //!< Flush the address from caches
147 NUM_COMMAND_ATTRIBUTES
151 * Structure that defines attributes and other data associated
156 /// Set of attribute flags.
157 const std::bitset<NUM_COMMAND_ATTRIBUTES> attributes;
158 /// Corresponding response for requests; InvalidCmd if no
159 /// response is applicable.
160 const Command response;
161 /// String representation (for printing)
162 const std::string str;
165 /// Array to map Command enum to associated info.
166 static const CommandInfo commandInfo[];
173 testCmdAttrib(MemCmd::Attribute attrib) const
175 return commandInfo[cmd].attributes[attrib] != 0;
180 bool isRead() const { return testCmdAttrib(IsRead); }
181 bool isWrite() const { return testCmdAttrib(IsWrite); }
182 bool isUpgrade() const { return testCmdAttrib(IsUpgrade); }
183 bool isRequest() const { return testCmdAttrib(IsRequest); }
184 bool isResponse() const { return testCmdAttrib(IsResponse); }
185 bool needsExclusive() const { return testCmdAttrib(NeedsExclusive); }
186 bool needsResponse() const { return testCmdAttrib(NeedsResponse); }
187 bool isInvalidate() const { return testCmdAttrib(IsInvalidate); }
188 bool isWriteInvalidate() const { return testCmdAttrib(IsWrite) &&
189 testCmdAttrib(IsInvalidate); }
192 * Check if this particular packet type carries payload data. Note
193 * that this does not reflect if the data pointer of the packet is
196 bool hasData() const { return testCmdAttrib(HasData); }
197 bool isLLSC() const { return testCmdAttrib(IsLlsc); }
198 bool isSWPrefetch() const { return testCmdAttrib(IsSWPrefetch); }
199 bool isHWPrefetch() const { return testCmdAttrib(IsHWPrefetch); }
200 bool isPrefetch() const { return testCmdAttrib(IsSWPrefetch) ||
201 testCmdAttrib(IsHWPrefetch); }
202 bool isError() const { return testCmdAttrib(IsError); }
203 bool isPrint() const { return testCmdAttrib(IsPrint); }
204 bool isFlush() const { return testCmdAttrib(IsFlush); }
207 responseCommand() const
209 return commandInfo[cmd].response;
212 /// Return the string to a cmd given by idx.
213 const std::string &toString() const { return commandInfo[cmd].str; }
214 int toInt() const { return (int)cmd; }
216 MemCmd(Command _cmd) : cmd(_cmd) { }
217 MemCmd(int _cmd) : cmd((Command)_cmd) { }
218 MemCmd() : cmd(InvalidCmd) { }
220 bool operator==(MemCmd c2) const { return (cmd == c2.cmd); }
221 bool operator!=(MemCmd c2) const { return (cmd != c2.cmd); }
225 * A Packet is used to encapsulate a transfer between two objects in
226 * the memory system (e.g., the L1 and L2 cache). (In contrast, a
227 * single Request travels all the way from the requester to the
228 * ultimate destination and back, possibly being conveyed by several
229 * different Packets along the way.)
231 class Packet : public Printable
234 typedef uint32_t FlagsType;
235 typedef ::Flags<FlagsType> Flags;
238 static const FlagsType PUBLIC_FLAGS = 0x00000000;
239 static const FlagsType PRIVATE_FLAGS = 0x00007F0F;
240 static const FlagsType COPY_FLAGS = 0x0000000F;
242 static const FlagsType SHARED = 0x00000001;
243 // Special control flags
244 /// Special timing-mode atomic snoop for multi-level coherence.
245 static const FlagsType EXPRESS_SNOOP = 0x00000002;
246 /// Does supplier have exclusive copy?
247 /// Useful for multi-level coherence.
248 static const FlagsType SUPPLY_EXCLUSIVE = 0x00000004;
249 // Snoop response flags
250 static const FlagsType MEM_INHIBIT = 0x00000008;
251 /// Are the 'addr' and 'size' fields valid?
252 static const FlagsType VALID_ADDR = 0x00000100;
253 static const FlagsType VALID_SIZE = 0x00000200;
254 /// Is the data pointer set to a value that shouldn't be freed
255 /// when the packet is destroyed?
256 static const FlagsType STATIC_DATA = 0x00001000;
257 /// The data pointer points to a value that should be freed when
258 /// the packet is destroyed. The pointer is assumed to be pointing
259 /// to an array, and delete [] is consequently called
260 static const FlagsType DYNAMIC_DATA = 0x00002000;
261 /// suppress the error if this packet encounters a functional
263 static const FlagsType SUPPRESS_FUNC_ERROR = 0x00008000;
264 // Signal block present to squash prefetch and cache evict packets
265 // through express snoop flag
266 static const FlagsType BLOCK_CACHED = 0x00010000;
271 typedef MemCmd::Command Command;
273 /// The command field of the packet.
276 /// A pointer to the original request.
277 const RequestPtr req;
281 * A pointer to the data being transfered. It can be differnt
282 * sizes at each level of the heirarchy so it belongs in the
283 * packet, not request. This may or may not be populated when a
284 * responder recieves the packet. If not populated it memory should
289 /// The address of the request. This address could be virtual or
290 /// physical, depending on the system configuration.
293 /// True if the request targets the secure memory space.
296 /// The size of the request or transfer.
300 * The original value of the command field. Only valid when the
301 * current command field is an error condition; in that case, the
302 * previous contents of the command field are copied here. This
303 * field is *not* set on non-error responses.
308 * Track the bytes found that satisfy a functional read.
310 std::vector<bool> bytesValid;
315 * The extra delay from seeing the packet until the header is
316 * transmitted. This delay is used to communicate the crossbar
317 * forwarding latency to the neighbouring object (e.g. a cache)
318 * that actually makes the packet wait. As the delay is relative,
319 * a 32-bit unsigned should be sufficient.
321 uint32_t headerDelay;
324 * The extra pipelining delay from seeing the packet until the end of
325 * payload is transmitted by the component that provided it (if
326 * any). This includes the header delay. Similar to the header
327 * delay, this is used to make up for the fact that the
328 * crossbar does not make the packet wait. As the delay is
329 * relative, a 32-bit unsigned should be sufficient.
331 uint32_t payloadDelay;
334 * A virtual base opaque structure used to hold state associated
335 * with the packet (e.g., an MSHR), specific to a MemObject that
336 * sees the packet. A pointer to this state is returned in the
337 * packet's response so that the MemObject in question can quickly
338 * look up the state needed to process it. A specific subclass
339 * would be derived from this to carry state specific to a
340 * particular sending device.
342 * As multiple MemObjects may add their SenderState throughout the
343 * memory system, the SenderStates create a stack, where a
344 * MemObject can add a new Senderstate, as long as the
345 * predecessing SenderState is restored when the response comes
346 * back. For this reason, the predecessor should always be
347 * populated with the current SenderState of a packet before
348 * modifying the senderState field in the request packet.
352 SenderState* predecessor;
353 SenderState() : predecessor(NULL) {}
354 virtual ~SenderState() {}
358 * Object used to maintain state of a PrintReq. The senderState
359 * field of a PrintReq should always be of this type.
361 class PrintReqState : public SenderState
365 * An entry in the label stack.
367 struct LabelStackEntry
369 const std::string label;
372 LabelStackEntry(const std::string &_label, std::string *_prefix);
375 typedef std::list<LabelStackEntry> LabelStack;
376 LabelStack labelStack;
378 std::string *curPrefixPtr;
384 PrintReqState(std::ostream &os, int verbosity = 0);
388 * Returns the current line prefix.
390 const std::string &curPrefix() { return *curPrefixPtr; }
393 * Push a label onto the label stack, and prepend the given
394 * prefix string onto the current prefix. Labels will only be
395 * printed if an object within the label's scope is printed.
397 void pushLabel(const std::string &lbl,
398 const std::string &prefix = " ");
401 * Pop a label off the label stack.
406 * Print all of the pending unprinted labels on the
407 * stack. Called by printObj(), so normally not called by
408 * users unless bypassing printObj().
413 * Print a Printable object to os, because it matched the
414 * address on a PrintReq.
416 void printObj(Printable *obj);
420 * This packet's sender state. Devices should use dynamic_cast<>
421 * to cast to the state appropriate to the sender. The intent of
422 * this variable is to allow a device to attach extra information
423 * to a request. A response packet must return the sender state
424 * that was attached to the original request (even if a new packet
427 SenderState *senderState;
430 * Push a new sender state to the packet and make the current
431 * sender state the predecessor of the new one. This should be
432 * prefered over direct manipulation of the senderState member
435 * @param sender_state SenderState to push at the top of the stack
437 void pushSenderState(SenderState *sender_state);
440 * Pop the top of the state stack and return a pointer to it. This
441 * assumes the current sender state is not NULL. This should be
442 * preferred over direct manipulation of the senderState member
445 * @return The current top of the stack
447 SenderState *popSenderState();
450 * Go through the sender state stack and return the first instance
451 * that is of type T (as determined by a dynamic_cast). If there
452 * is no sender state of type T, NULL is returned.
454 * @return The topmost state of type T
456 template <typename T>
457 T * findNextSenderState() const
460 SenderState* sender_state = senderState;
461 while (t == NULL && sender_state != NULL) {
462 t = dynamic_cast<T*>(sender_state);
463 sender_state = sender_state->predecessor;
468 /// Return the string name of the cmd field (for debugging and
470 const std::string &cmdString() const { return cmd.toString(); }
472 /// Return the index of this command.
473 inline int cmdToIndex() const { return cmd.toInt(); }
475 bool isRead() const { return cmd.isRead(); }
476 bool isWrite() const { return cmd.isWrite(); }
477 bool isUpgrade() const { return cmd.isUpgrade(); }
478 bool isRequest() const { return cmd.isRequest(); }
479 bool isResponse() const { return cmd.isResponse(); }
480 bool needsExclusive() const { return cmd.needsExclusive(); }
481 bool needsResponse() const { return cmd.needsResponse(); }
482 bool isInvalidate() const { return cmd.isInvalidate(); }
483 bool isWriteInvalidate() const { return cmd.isWriteInvalidate(); }
484 bool hasData() const { return cmd.hasData(); }
485 bool isLLSC() const { return cmd.isLLSC(); }
486 bool isError() const { return cmd.isError(); }
487 bool isPrint() const { return cmd.isPrint(); }
488 bool isFlush() const { return cmd.isFlush(); }
491 void assertMemInhibit()
494 assert(!flags.isSet(MEM_INHIBIT));
495 flags.set(MEM_INHIBIT);
497 bool memInhibitAsserted() const { return flags.isSet(MEM_INHIBIT); }
498 void assertShared() { flags.set(SHARED); }
499 bool sharedAsserted() const { return flags.isSet(SHARED); }
501 // Special control flags
502 void setExpressSnoop() { flags.set(EXPRESS_SNOOP); }
503 bool isExpressSnoop() const { return flags.isSet(EXPRESS_SNOOP); }
504 void setSupplyExclusive() { flags.set(SUPPLY_EXCLUSIVE); }
505 void clearSupplyExclusive() { flags.clear(SUPPLY_EXCLUSIVE); }
506 bool isSupplyExclusive() const { return flags.isSet(SUPPLY_EXCLUSIVE); }
507 void setSuppressFuncError() { flags.set(SUPPRESS_FUNC_ERROR); }
508 bool suppressFuncError() const { return flags.isSet(SUPPRESS_FUNC_ERROR); }
509 void setBlockCached() { flags.set(BLOCK_CACHED); }
510 bool isBlockCached() const { return flags.isSet(BLOCK_CACHED); }
512 // Network error conditions... encapsulate them as methods since
513 // their encoding keeps changing (from result field to command
518 assert(isResponse());
519 cmd = MemCmd::BadAddressError;
522 bool hadBadAddress() const { return cmd == MemCmd::BadAddressError; }
523 void copyError(Packet *pkt) { assert(pkt->isError()); cmd = pkt->cmd; }
525 Addr getAddr() const { assert(flags.isSet(VALID_ADDR)); return addr; }
527 * Update the address of this packet mid-transaction. This is used
528 * by the address mapper to change an already set address to a new
529 * one based on the system configuration. It is intended to remap
530 * an existing address, so it asserts that the current address is
533 void setAddr(Addr _addr) { assert(flags.isSet(VALID_ADDR)); addr = _addr; }
535 unsigned getSize() const { assert(flags.isSet(VALID_SIZE)); return size; }
536 Addr getOffset(int blkSize) const { return getAddr() & (Addr)(blkSize - 1); }
538 bool isSecure() const
540 assert(flags.isSet(VALID_ADDR));
545 * It has been determined that the SC packet should successfully update
546 * memory. Therefore, convert this SC packet to a normal write.
553 cmd = MemCmd::WriteReq;
557 * When ruby is in use, Ruby will monitor the cache line and thus M5
558 * phys memory should treat LL ops as normal reads.
565 cmd = MemCmd::ReadReq;
569 * Constructor. Note that a Request object must be constructed
570 * first, but the Requests's physical address and size fields need
571 * not be valid. The command must be supplied.
573 Packet(const RequestPtr _req, MemCmd _cmd)
574 : cmd(_cmd), req(_req), data(nullptr), addr(0), _isSecure(false),
575 size(0), headerDelay(0), payloadDelay(0),
578 if (req->hasPaddr()) {
579 addr = req->getPaddr();
580 flags.set(VALID_ADDR);
581 _isSecure = req->isSecure();
583 if (req->hasSize()) {
584 size = req->getSize();
585 flags.set(VALID_SIZE);
590 * Alternate constructor if you are trying to create a packet with
591 * a request that is for a whole block, not the address from the
592 * req. this allows for overriding the size/addr of the req.
594 Packet(const RequestPtr _req, MemCmd _cmd, int _blkSize)
595 : cmd(_cmd), req(_req), data(nullptr), addr(0), _isSecure(false),
596 headerDelay(0), payloadDelay(0),
599 if (req->hasPaddr()) {
600 addr = req->getPaddr() & ~(_blkSize - 1);
601 flags.set(VALID_ADDR);
602 _isSecure = req->isSecure();
605 flags.set(VALID_SIZE);
609 * Alternate constructor for copying a packet. Copy all fields
610 * *except* if the original packet's data was dynamic, don't copy
611 * that, as we can't guarantee that the new packet's lifetime is
612 * less than that of the original packet. In this case the new
613 * packet should allocate its own data.
615 Packet(PacketPtr pkt, bool clear_flags, bool alloc_data)
616 : cmd(pkt->cmd), req(pkt->req),
618 addr(pkt->addr), _isSecure(pkt->_isSecure), size(pkt->size),
619 bytesValid(pkt->bytesValid),
620 headerDelay(pkt->headerDelay),
621 payloadDelay(pkt->payloadDelay),
622 senderState(pkt->senderState)
625 flags.set(pkt->flags & COPY_FLAGS);
627 flags.set(pkt->flags & (VALID_ADDR|VALID_SIZE));
629 // should we allocate space for data, or not, the express
630 // snoops do not need to carry any data as they only serve to
631 // co-ordinate state changes
633 // even if asked to allocate data, if the original packet
634 // holds static data, then the sender will not be doing
635 // any memcpy on receiving the response, thus we simply
636 // carry the pointer forward
637 if (pkt->flags.isSet(STATIC_DATA)) {
639 flags.set(STATIC_DATA);
647 * Generate the appropriate read MemCmd based on the Request flags.
650 makeReadCmd(const RequestPtr req)
653 return MemCmd::LoadLockedReq;
654 else if (req->isPrefetch())
655 return MemCmd::SoftPFReq;
657 return MemCmd::ReadReq;
661 * Generate the appropriate write MemCmd based on the Request flags.
664 makeWriteCmd(const RequestPtr req)
667 return MemCmd::StoreCondReq;
668 else if (req->isSwap())
669 return MemCmd::SwapReq;
671 return MemCmd::WriteReq;
675 * Constructor-like methods that return Packets based on Request objects.
676 * Fine-tune the MemCmd type if it's not a vanilla read or write.
679 createRead(const RequestPtr req)
681 return new Packet(req, makeReadCmd(req));
685 createWrite(const RequestPtr req)
687 return new Packet(req, makeWriteCmd(req));
691 * clean up packet variables
695 // If this is a request packet for which there's no response,
696 // delete the request object here, since the requester will
697 // never get the chance.
698 if (req && isRequest() && !needsResponse())
704 * Take a request packet and modify it in place to be suitable for
705 * returning as a response to that request.
710 assert(needsResponse());
713 cmd = cmd.responseCommand();
715 // responses are never express, even if the snoop that
716 // triggered them was
717 flags.clear(EXPRESS_SNOOP);
733 setFunctionalResponseStatus(bool success)
737 cmd = MemCmd::FunctionalWriteError;
739 cmd = MemCmd::FunctionalReadError;
745 setSize(unsigned size)
747 assert(!flags.isSet(VALID_SIZE));
750 flags.set(VALID_SIZE);
755 * Set the data pointer to the following value that should not be
756 * freed. Static data allows us to do a single memcpy even if
757 * multiple packets are required to get from source to destination
758 * and back. In essence the pointer is set calling dataStatic on
759 * the original packet, and whenever this packet is copied and
760 * forwarded the same pointer is passed on. When a packet
761 * eventually reaches the destination holding the data, it is
762 * copied once into the location originally set. On the way back
763 * to the source, no copies are necessary.
765 template <typename T>
769 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA));
770 data = (PacketDataPtr)p;
771 flags.set(STATIC_DATA);
775 * Set the data pointer to the following value that should not be
776 * freed. This version of the function allows the pointer passed
777 * to us to be const. To avoid issues down the line we cast the
778 * constness away, the alternative would be to keep both a const
779 * and non-const data pointer and cleverly choose between
780 * them. Note that this is only allowed for static data.
782 template <typename T>
784 dataStaticConst(const T *p)
786 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA));
787 data = const_cast<PacketDataPtr>(p);
788 flags.set(STATIC_DATA);
792 * Set the data pointer to a value that should have delete []
793 * called on it. Dynamic data is local to this packet, and as the
794 * packet travels from source to destination, forwarded packets
795 * will allocate their own data. When a packet reaches the final
796 * destination it will populate the dynamic data of that specific
797 * packet, and on the way back towards the source, memcpy will be
798 * invoked in every step where a new packet was created e.g. in
799 * the caches. Ultimately when the response reaches the source a
800 * final memcpy is needed to extract the data from the packet
801 * before it is deallocated.
803 template <typename T>
807 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA));
808 data = (PacketDataPtr)p;
809 flags.set(DYNAMIC_DATA);
813 * get a pointer to the data ptr.
815 template <typename T>
819 assert(flags.isSet(STATIC_DATA|DYNAMIC_DATA));
823 template <typename T>
827 assert(flags.isSet(STATIC_DATA|DYNAMIC_DATA));
828 return (const T*)data;
832 * return the value of what is pointed to in the packet.
834 template <typename T>
838 * set the value in the data pointer to v.
840 template <typename T>
844 * Copy data into the packet from the provided pointer.
847 setData(const uint8_t *p)
849 // we should never be copying data onto itself, which means we
850 // must idenfity packets with static data, as they carry the
851 // same pointer from source to destination and back
852 assert(p != getPtr<uint8_t>() || flags.isSet(STATIC_DATA));
854 if (p != getPtr<uint8_t>())
855 // for packet with allocated dynamic data, we copy data from
856 // one to the other, e.g. a forwarded response to a response
857 std::memcpy(getPtr<uint8_t>(), p, getSize());
861 * Copy data into the packet from the provided block pointer,
862 * which is aligned to the given block size.
865 setDataFromBlock(const uint8_t *blk_data, int blkSize)
867 setData(blk_data + getOffset(blkSize));
871 * Copy data from the packet to the provided block pointer, which
872 * is aligned to the given block size.
875 writeData(uint8_t *p) const
877 std::memcpy(p, getConstPtr<uint8_t>(), getSize());
881 * Copy data from the packet to the memory at the provided pointer.
884 writeDataToBlock(uint8_t *blk_data, int blkSize) const
886 writeData(blk_data + getOffset(blkSize));
890 * delete the data pointed to in the data pointer. Ok to call to
891 * matter how data was allocted.
896 if (flags.isSet(DYNAMIC_DATA))
899 flags.clear(STATIC_DATA|DYNAMIC_DATA);
903 /** Allocate memory for the packet. */
907 assert(flags.noneSet(STATIC_DATA|DYNAMIC_DATA));
908 flags.set(DYNAMIC_DATA);
909 data = new uint8_t[getSize()];
913 * Check a functional request against a memory value stored in
914 * another packet (i.e. an in-transit request or
915 * response). Returns true if the current packet is a read, and
916 * the other packet provides the data, which is then copied to the
917 * current packet. If the current packet is a write, and the other
918 * packet intersects this one, then we update the data
922 checkFunctional(PacketPtr other)
924 // all packets that are carrying a payload should have a valid
926 return checkFunctional(other, other->getAddr(), other->isSecure(),
929 other->getPtr<uint8_t>() : NULL);
933 * Check a functional request against a memory value represented
934 * by a base/size pair and an associated data array. If the
935 * current packet is a read, it may be satisfied by the memory
936 * value. If the current packet is a write, it may update the
940 checkFunctional(Printable *obj, Addr base, bool is_secure, int size,
944 * Push label for PrintReq (safe to call unconditionally).
947 pushLabel(const std::string &lbl)
950 safe_cast<PrintReqState*>(senderState)->pushLabel(lbl);
954 * Pop label for PrintReq (safe to call unconditionally).
960 safe_cast<PrintReqState*>(senderState)->popLabel();
963 void print(std::ostream &o, int verbosity = 0,
964 const std::string &prefix = "") const;
967 * A no-args wrapper of print(std::ostream...)
968 * meant to be invoked from DPRINTFs
969 * avoiding string overheads in fast mode
970 * @return string with the request's type and start<->end addresses
972 std::string print() const;
975 #endif //__MEM_PACKET_HH