2 * Copyright (c) 2011-2012 ARM Limited
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14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
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28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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__
55 #include "base/range.hh"
56 #include "mem/packet.hh"
59 * This typedef is used to clean up getAddrRanges(). It's declared
60 * outside the Port object since it's also used by some mem objects.
61 * Eventually we should move this typedef to wherever Addr is
65 typedef std::list<Range<Addr> > AddrRangeList;
66 typedef std::list<Range<Addr> >::iterator AddrRangeIter;
71 * Ports are used to interface memory objects to each other. A port is
72 * either a master or a slave and the connected peer is always of the
75 * Each port has a name and an owner, and enables three basic types of
76 * accesses to the peer port: functional, atomic and timing.
83 /** Descriptive name (for DPRINTF output) */
89 * A numeric identifier to distinguish ports in a vector, and set
90 * to InvalidPortID in case this port is not part of a vector.
94 /** A pointer to the peer port. */
97 /** A reference to the MemObject that owns this port. */
101 * Abstract base class for ports
103 * @param _name Port name including the owners name
104 * @param _owner The MemObject that is the structural owner of this port
105 * @param _id A port identifier for vector ports
107 Port(const std::string& _name, MemObject& _owner, PortID _id);
110 * Virtual destructor due to inheritance.
116 /** Return port name (for DPRINTF). */
117 const std::string name() const { return portName; }
119 /** Get the port id. */
120 PortID getId() const { return id; }
125 * Called by a peer port if sendTimingReq, sendTimingResp or
126 * sendTimingSnoopResp was unsuccesful, and had to wait.
128 virtual void recvRetry() = 0;
133 * Send a retry to a peer port that previously attempted a
134 * sendTimingReq, sendTimingResp or sendTimingSnoopResp which was
137 void sendRetry() { return peer->recvRetry(); }
141 /** Forward declaration */
145 * A MasterPort is a specialisation of a port. In addition to the
146 * basic functionality of sending packets to its slave peer, it also
147 * has functions specific to a master, e.g. to receive range changes
148 * or determine if the port is snooping or not.
150 class MasterPort : public Port
153 friend class SlavePort;
157 SlavePort* _slavePort;
161 MasterPort(const std::string& name, MemObject* owner,
162 PortID id = InvalidPortID);
163 virtual ~MasterPort();
165 void bind(SlavePort& slave_port);
166 SlavePort& getSlavePort() const;
167 bool isConnected() const;
170 * Send an atomic request packet, where the data is moved and the
171 * state is updated in zero time, without interleaving with other
174 * @param pkt Packet to send.
176 * @return Estimated latency of access.
178 Tick sendAtomic(PacketPtr pkt);
181 * Send a functional request packet, where the data is instantly
182 * updated everywhere in the memory system, without affecting the
183 * current state of any block or moving the block.
185 * @param pkt Packet to send.
187 void sendFunctional(PacketPtr pkt);
190 * Attempt to send a timing request to the slave port by calling
191 * its corresponding receive function. If the send does not
192 * succeed, as indicated by the return value, then the sender must
193 * wait for a recvRetry at which point it can re-issue a
196 * @param pkt Packet to send.
198 * @return If the send was succesful or not.
200 bool sendTimingReq(PacketPtr pkt);
203 * Attempt to send a timing snoop response packet to the slave
204 * port by calling its corresponding receive function. If the send
205 * does not succeed, as indicated by the return value, then the
206 * sender must wait for a recvRetry at which point it can re-issue
207 * a sendTimingSnoopResp.
209 * @param pkt Packet to send.
211 bool sendTimingSnoopResp(PacketPtr pkt);
214 * Determine if this master port is snooping or not. The default
215 * implementation returns false and thus tells the neighbour we
216 * are not snooping. Any master port that wants to receive snoop
217 * requests (e.g. a cache connected to a bus) has to override this
220 * @return true if the port should be considered a snooper
222 virtual bool isSnooping() const { return false; }
225 * Called by a peer port in order to determine the block size of
226 * the owner of this port.
228 virtual unsigned deviceBlockSize() const { return 0; }
230 /** Called by the associated device if it wishes to find out the blocksize
231 of the device on attached to the peer port.
233 unsigned peerBlockSize() const;
235 /** Inject a PrintReq for the given address to print the state of
236 * that address throughout the memory system. For debugging.
238 void printAddr(Addr a);
243 * Receive an atomic snoop request packet from the slave port.
245 virtual Tick recvAtomicSnoop(PacketPtr pkt)
247 panic("%s was not expecting an atomic snoop request\n", name());
252 * Receive a functional snoop request packet from the slave port.
254 virtual void recvFunctionalSnoop(PacketPtr pkt)
256 panic("%s was not expecting a functional snoop request\n", name());
260 * Receive a timing response from the slave port.
262 virtual bool recvTimingResp(PacketPtr pkt) = 0;
265 * Receive a timing snoop request from the slave port.
267 virtual void recvTimingSnoopReq(PacketPtr pkt)
269 panic("%s was not expecting a timing snoop request\n", name());
273 * Called to receive an address range change from the peer slave
274 * port. the default implementation ignored the change and does
275 * nothing. Override this function in a derived class if the owner
276 * needs to be aware of he laesddress ranges, e.g. in an
277 * interconnect component like a bus.
279 virtual void recvRangeChange() { }
283 * A SlavePort is a specialisation of a port. In addition to the
284 * basic functionality of sending packets to its master peer, it also
285 * has functions specific to a slave, e.g. to send range changes
286 * and get the address ranges that the port responds to.
288 class SlavePort : public Port
291 friend class MasterPort;
295 MasterPort* _masterPort;
299 SlavePort(const std::string& name, MemObject* owner,
300 PortID id = InvalidPortID);
301 virtual ~SlavePort();
303 void bind(MasterPort& master_port);
304 MasterPort& getMasterPort() const;
305 bool isConnected() const;
308 * Send an atomic snoop request packet, where the data is moved
309 * and the state is updated in zero time, without interleaving
310 * with other memory accesses.
312 * @param pkt Snoop packet to send.
314 * @return Estimated latency of access.
316 Tick sendAtomicSnoop(PacketPtr pkt);
319 * Send a functional snoop request packet, where the data is
320 * instantly updated everywhere in the memory system, without
321 * affecting the current state of any block or moving the block.
323 * @param pkt Snoop packet to send.
325 void sendFunctionalSnoop(PacketPtr pkt);
328 * Attempt to send a timing response to the master port by calling
329 * its corresponding receive function. If the send does not
330 * succeed, as indicated by the return value, then the sender must
331 * wait for a recvRetry at which point it can re-issue a
334 * @param pkt Packet to send.
336 * @return If the send was succesful or not.
338 bool sendTimingResp(PacketPtr pkt);
341 * Attempt to send a timing snoop request packet to the master port
342 * by calling its corresponding receive function. Snoop requests
343 * always succeed and hence no return value is needed.
345 * @param pkt Packet to send.
347 void sendTimingSnoopReq(PacketPtr pkt);
350 * Called by a peer port in order to determine the block size of
351 * the owner of this port.
353 virtual unsigned deviceBlockSize() const { return 0; }
355 /** Called by the associated device if it wishes to find out the blocksize
356 of the device on attached to the peer port.
358 unsigned peerBlockSize() const;
361 * Called by the owner to send a range change
363 void sendRangeChange() const { _masterPort->recvRangeChange(); }
366 * Get a list of the non-overlapping address ranges the owner is
367 * responsible for. All slave ports must override this function
368 * and return a populated list with at least one item.
370 * @return a list of ranges responded to
372 virtual AddrRangeList getAddrRanges() = 0;
377 * Receive an atomic request packet from the master port.
379 virtual Tick recvAtomic(PacketPtr pkt) = 0;
382 * Receive a functional request packet from the master port.
384 virtual void recvFunctional(PacketPtr pkt) = 0;
387 * Receive a timing request from the master port.
389 virtual bool recvTimingReq(PacketPtr pkt) = 0;
392 * Receive a timing snoop response from the master port.
394 virtual bool recvTimingSnoopResp(PacketPtr pkt)
396 panic("%s was not expecting a timing snoop response\n", name());
401 #endif //__MEM_PORT_HH__