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38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 * Authors: Ron Dreslinski
47 * Port Object Declaration.
50 #ifndef __MEM_PORT_HH__
51 #define __MEM_PORT_HH__
53 #include "base/addr_range.hh"
54 #include "mem/packet.hh"
59 * Ports are used to interface memory objects to each other. A port is
60 * either a master or a slave and the connected peer is always of the
61 * opposite role. Each port has a name, an owner, and an identifier.
68 /** Descriptive name (for DPRINTF output) */
74 * A numeric identifier to distinguish ports in a vector, and set
75 * to InvalidPortID in case this port is not part of a vector.
79 /** A reference to the MemObject that owns this port. */
83 * Abstract base class for ports
85 * @param _name Port name including the owners name
86 * @param _owner The MemObject that is the structural owner of this port
87 * @param _id A port identifier for vector ports
89 Port(const std::string& _name, MemObject& _owner, PortID _id);
92 * Virtual destructor due to inheritance.
98 /** Return port name (for DPRINTF). */
99 const std::string name() const { return portName; }
101 /** Get the port id. */
102 PortID getId() const { return id; }
106 /** Forward declaration */
110 * A BaseMasterPort is a protocol-agnostic master port, responsible
111 * only for the structural connection to a slave port. The final
112 * master port that inherits from the base class must override the
113 * bind member function for the specific slave port class.
115 class BaseMasterPort : public Port
120 BaseSlavePort* _baseSlavePort;
122 BaseMasterPort(const std::string& name, MemObject* owner,
123 PortID id = InvalidPortID);
124 virtual ~BaseMasterPort();
128 virtual void bind(BaseSlavePort& slave_port) = 0;
129 virtual void unbind() = 0;
130 BaseSlavePort& getSlavePort() const;
131 bool isConnected() const;
136 * A BaseSlavePort is a protocol-agnostic slave port, responsible
137 * only for the structural connection to a master port.
139 class BaseSlavePort : public Port
144 BaseMasterPort* _baseMasterPort;
146 BaseSlavePort(const std::string& name, MemObject* owner,
147 PortID id = InvalidPortID);
148 virtual ~BaseSlavePort();
152 BaseMasterPort& getMasterPort() const;
153 bool isConnected() const;
157 /** Forward declaration */
161 * A MasterPort is a specialisation of a BaseMasterPort, which
162 * implements the default protocol for the three different level of
163 * transport functions. In addition to the basic functionality of
164 * sending packets, it also has functions to receive range changes or
165 * determine if the port is snooping or not.
167 class MasterPort : public BaseMasterPort
170 friend class SlavePort;
174 SlavePort* _slavePort;
178 MasterPort(const std::string& name, MemObject* owner,
179 PortID id = InvalidPortID);
180 virtual ~MasterPort();
183 * Bind this master port to a slave port. This also does the
184 * mirror action and binds the slave port to the master port.
186 void bind(BaseSlavePort& slave_port);
189 * Unbind this master port and the associated slave port.
194 * Send an atomic request packet, where the data is moved and the
195 * state is updated in zero time, without interleaving with other
198 * @param pkt Packet to send.
200 * @return Estimated latency of access.
202 Tick sendAtomic(PacketPtr pkt);
205 * Send a functional request packet, where the data is instantly
206 * updated everywhere in the memory system, without affecting the
207 * current state of any block or moving the block.
209 * @param pkt Packet to send.
211 void sendFunctional(PacketPtr pkt);
214 * Attempt to send a timing request to the slave port by calling
215 * its corresponding receive function. If the send does not
216 * succeed, as indicated by the return value, then the sender must
217 * wait for a recvReqRetry at which point it can re-issue a
220 * @param pkt Packet to send.
222 * @return If the send was succesful or not.
224 bool sendTimingReq(PacketPtr pkt);
227 * Check if the slave can handle a timing request.
229 * If the send cannot be handled at the moment, as indicated by
230 * the return value, then the sender will receive a recvReqRetry
231 * at which point it can re-issue a sendTimingReq.
233 * @param pkt Packet to send.
235 * @return If the send was succesful or not.
237 bool tryTiming(PacketPtr pkt) const;
240 * Attempt to send a timing snoop response packet to the slave
241 * port by calling its corresponding receive function. If the send
242 * does not succeed, as indicated by the return value, then the
243 * sender must wait for a recvRetrySnoop at which point it can
244 * re-issue a sendTimingSnoopResp.
246 * @param pkt Packet to send.
248 bool sendTimingSnoopResp(PacketPtr pkt);
251 * Send a retry to the slave port that previously attempted a
252 * sendTimingResp to this master port and failed. Note that this
253 * is virtual so that the "fake" snoop response port in the
254 * coherent crossbar can override the behaviour.
256 virtual void sendRetryResp();
259 * Determine if this master port is snooping or not. The default
260 * implementation returns false and thus tells the neighbour we
261 * are not snooping. Any master port that wants to receive snoop
262 * requests (e.g. a cache connected to a bus) has to override this
265 * @return true if the port should be considered a snooper
267 virtual bool isSnooping() const { return false; }
270 * Get the address ranges of the connected slave port.
272 AddrRangeList getAddrRanges() const;
274 /** Inject a PrintReq for the given address to print the state of
275 * that address throughout the memory system. For debugging.
277 void printAddr(Addr a);
282 * Receive an atomic snoop request packet from the slave port.
284 virtual Tick recvAtomicSnoop(PacketPtr pkt)
286 panic("%s was not expecting an atomic snoop request\n", name());
291 * Receive a functional snoop request packet from the slave port.
293 virtual void recvFunctionalSnoop(PacketPtr pkt)
295 panic("%s was not expecting a functional snoop request\n", name());
299 * Receive a timing response from the slave port.
301 virtual bool recvTimingResp(PacketPtr pkt) = 0;
304 * Receive a timing snoop request from the slave port.
306 virtual void recvTimingSnoopReq(PacketPtr pkt)
308 panic("%s was not expecting a timing snoop request\n", name());
312 * Called by the slave port if sendTimingReq was called on this
313 * master port (causing recvTimingReq to be called on the slave
314 * port) and was unsuccesful.
316 virtual void recvReqRetry() = 0;
319 * Called by the slave port if sendTimingSnoopResp was called on this
320 * master port (causing recvTimingSnoopResp to be called on the slave
321 * port) and was unsuccesful.
323 virtual void recvRetrySnoopResp()
325 panic("%s was not expecting a snoop retry\n", name());
329 * Called to receive an address range change from the peer slave
330 * port. The default implementation ignores the change and does
331 * nothing. Override this function in a derived class if the owner
332 * needs to be aware of the address ranges, e.g. in an
333 * interconnect component like a bus.
335 virtual void recvRangeChange() { }
339 * A SlavePort is a specialisation of a port. In addition to the
340 * basic functionality of sending packets to its master peer, it also
341 * has functions specific to a slave, e.g. to send range changes
342 * and get the address ranges that the port responds to.
344 class SlavePort : public BaseSlavePort
347 friend class MasterPort;
351 MasterPort* _masterPort;
355 SlavePort(const std::string& name, MemObject* owner,
356 PortID id = InvalidPortID);
357 virtual ~SlavePort();
360 * Send an atomic snoop request packet, where the data is moved
361 * and the state is updated in zero time, without interleaving
362 * with other memory accesses.
364 * @param pkt Snoop packet to send.
366 * @return Estimated latency of access.
368 Tick sendAtomicSnoop(PacketPtr pkt);
371 * Send a functional snoop request packet, where the data is
372 * instantly updated everywhere in the memory system, without
373 * affecting the current state of any block or moving the block.
375 * @param pkt Snoop packet to send.
377 void sendFunctionalSnoop(PacketPtr pkt);
380 * Attempt to send a timing response to the master port by calling
381 * its corresponding receive function. If the send does not
382 * succeed, as indicated by the return value, then the sender must
383 * wait for a recvRespRetry at which point it can re-issue a
386 * @param pkt Packet to send.
388 * @return If the send was succesful or not.
390 bool sendTimingResp(PacketPtr pkt);
393 * Attempt to send a timing snoop request packet to the master port
394 * by calling its corresponding receive function. Snoop requests
395 * always succeed and hence no return value is needed.
397 * @param pkt Packet to send.
399 void sendTimingSnoopReq(PacketPtr pkt);
402 * Send a retry to the master port that previously attempted a
403 * sendTimingReq to this slave port and failed.
408 * Send a retry to the master port that previously attempted a
409 * sendTimingSnoopResp to this slave port and failed.
411 void sendRetrySnoopResp();
414 * Find out if the peer master port is snooping or not.
416 * @return true if the peer master port is snooping
418 bool isSnooping() const { return _masterPort->isSnooping(); }
421 * Called by the owner to send a range change
423 void sendRangeChange() const {
425 fatal("%s cannot sendRangeChange() without master port", name());
426 _masterPort->recvRangeChange();
430 * Get a list of the non-overlapping address ranges the owner is
431 * responsible for. All slave ports must override this function
432 * and return a populated list with at least one item.
434 * @return a list of ranges responded to
436 virtual AddrRangeList getAddrRanges() const = 0;
441 * Called by the master port to unbind. Should never be called
447 * Called by the master port to bind. Should never be called
450 void bind(MasterPort& master_port);
453 * Receive an atomic request packet from the master port.
455 virtual Tick recvAtomic(PacketPtr pkt) = 0;
458 * Receive a functional request packet from the master port.
460 virtual void recvFunctional(PacketPtr pkt) = 0;
463 * Receive a timing request from the master port.
465 virtual bool recvTimingReq(PacketPtr pkt) = 0;
468 * Availability request from the master port.
470 virtual bool tryTiming(PacketPtr pkt) {
471 panic("%s was not expecting a %s\n", name(), __func__);
475 * Receive a timing snoop response from the master port.
477 virtual bool recvTimingSnoopResp(PacketPtr pkt)
479 panic("%s was not expecting a timing snoop response\n", name());
483 * Called by the master port if sendTimingResp was called on this
484 * slave port (causing recvTimingResp to be called on the master
485 * port) and was unsuccesful.
487 virtual void recvRespRetry() = 0;
491 #endif //__MEM_PORT_HH__