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31 * Port Object Decleration. Ports are used to interface memory objects to
32 * each other. They will always come in pairs, and we refer to the other
33 * port object as the peer. These are used to make the design more
34 * modular so that a specific interface between every type of objcet doesn't
38 #ifndef __MEM_PORT_HH__
39 #define __MEM_PORT_HH__
44 #include "base/misc.hh"
45 #include "base/range.hh"
46 #include "mem/packet.hh"
47 #include "mem/request.hh"
49 /** This typedef is used to clean up the parameter list of
50 * getDeviceAddressRanges() and getPeerAddressRanges(). It's declared
51 * outside the Port object since it's also used by some mem objects.
52 * Eventually we should move this typedef to wherever Addr is
56 typedef std::list<Range<Addr> > AddrRangeList;
57 typedef std::list<Range<Addr> >::iterator AddrRangeIter;
60 * Ports are used to interface memory objects to
61 * each other. They will always come in pairs, and we refer to the other
62 * port object as the peer. These are used to make the design more
63 * modular so that a specific interface between every type of objcet doesn't
66 * Recv accesor functions are being called from the peer interface.
67 * Send accessor functions are being called from the device the port is
68 * associated with, and it will call the peer recv. accessor function.
74 /** Descriptive name (for DPRINTF output) */
75 const std::string portName;
82 * @param _name Port name for DPRINTF output. Should include name
83 * of memory system object to which the port belongs.
85 Port(const std::string &_name)
89 /** Return port name (for DPRINTF). */
90 const std::string &name() const { return portName; }
94 // mey be better to use subclasses & RTTI?
95 /** Holds the ports status. Keeps track if it is blocked, or has
96 calculated a range change. */
105 /** A pointer to the peer port. Ports always come in pairs, that way they
106 can use a standardized interface to communicate between different
112 /** Function to set the pointer for the peer port.
113 @todo should be called by the configuration stuff (python).
115 void setPeer(Port *port) { peer = port; }
117 /** Function to set the pointer for the peer port.
118 @todo should be called by the configuration stuff (python).
120 Port *getPeer() { return peer; }
124 /** These functions are protected because they should only be
125 * called by a peer port, never directly by any outside object. */
127 /** Called to recive a timing call from the peer port. */
128 virtual bool recvTiming(Packet *pkt) = 0;
130 /** Called to recive a atomic call from the peer port. */
131 virtual Tick recvAtomic(Packet *pkt) = 0;
133 /** Called to recive a functional call from the peer port. */
134 virtual void recvFunctional(Packet *pkt) = 0;
136 /** Called to recieve a status change from the peer port. */
137 virtual void recvStatusChange(Status status) = 0;
139 /** Called by a peer port if the send was unsuccesful, and had to
140 wait. This shouldn't be valid for response paths (IO Devices).
141 so it is set to panic if it isn't already defined.
143 virtual Packet *recvRetry() { panic("??"); }
145 /** Called by a peer port in order to determine the block size of the
146 device connected to this port. It sometimes doesn't make sense for
147 this function to be called, a DMA interface doesn't really have a
148 block size, so it is defaulted to a panic.
150 virtual int deviceBlockSize() { panic("??"); }
152 /** The peer port is requesting us to reply with a list of the ranges we
154 @param resp is a list of ranges responded to
155 @param snoop is a list of ranges snooped
157 virtual void getDeviceAddressRanges(AddrRangeList &resp,
158 AddrRangeList &snoop)
163 /** Function called by associated memory device (cache, memory, iodevice)
164 in order to send a timing request to the port. Simply calls the peer
165 port receive function.
166 @return This function returns if the send was succesful in it's
167 recieve. If it was a failure, then the port will wait for a recvRetry
168 at which point it can issue a successful sendTiming. This is used in
169 case a cache has a higher priority request come in while waiting for
170 the bus to arbitrate.
172 bool sendTiming(Packet *pkt) { return peer->recvTiming(pkt); }
174 /** Function called by the associated device to send an atomic access,
175 an access in which the data is moved and the state is updated in one
176 cycle, without interleaving with other memory accesses.
178 Tick sendAtomic(Packet *pkt)
179 { return peer->recvAtomic(pkt); }
181 /** Function called by the associated device to send a functional access,
182 an access in which the data is instantly updated everywhere in the
183 memory system, without affecting the current state of any block or
186 void sendFunctional(Packet *pkt)
187 { return peer->recvFunctional(pkt); }
189 /** Called by the associated device to send a status change to the device
190 connected to the peer interface.
192 void sendStatusChange(Status status) {peer->recvStatusChange(status); }
194 /** When a timing access doesn't return a success, some time later the
197 Packet *sendRetry() { return peer->recvRetry(); }
199 /** Called by the associated device if it wishes to find out the blocksize
200 of the device on attached to the peer port.
202 int peerBlockSize() { return peer->deviceBlockSize(); }
204 /** Called by the associated device if it wishes to find out the address
205 ranges connected to the peer ports devices.
207 void getPeerAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
208 { peer->getDeviceAddressRanges(resp, snoop); }
210 /** This function is a wrapper around sendFunctional()
211 that breaks a larger, arbitrarily aligned access into
212 appropriate chunks. The default implementation can use
213 getBlockSize() to determine the block size and go from there.
215 virtual void readBlob(Addr addr, uint8_t *p, int size);
217 /** This function is a wrapper around sendFunctional()
218 that breaks a larger, arbitrarily aligned access into
219 appropriate chunks. The default implementation can use
220 getBlockSize() to determine the block size and go from there.
222 virtual void writeBlob(Addr addr, uint8_t *p, int size);
224 /** Fill size bytes starting at addr with byte value val. This
225 should not need to be virtual, since it can be implemented in
226 terms of writeBlob(). However, it shouldn't be
227 performance-critical either, so it could be if we wanted to.
229 virtual void memsetBlob(Addr addr, uint8_t val, int size);
233 /** Internal helper function for read/writeBlob().
235 void blobHelper(Addr addr, uint8_t *p, int size, Command cmd);
238 /** A simple functional port that is only meant for one way communication to
239 * physical memory. It is only meant to be used to load data into memory before
240 * the simulation begins.
243 class FunctionalPort : public Port
246 FunctionalPort(const std::string &_name)
250 virtual bool recvTiming(Packet *pkt) { panic("FuncPort is UniDir"); }
251 virtual Tick recvAtomic(Packet *pkt) { panic("FuncPort is UniDir"); }
252 virtual void recvFunctional(Packet *pkt) { panic("FuncPort is UniDir"); }
253 virtual void recvStatusChange(Status status) {}
255 template <typename T>
256 inline void write(Addr addr, T d)
258 writeBlob(addr, (uint8_t*)&d, sizeof(T));
261 template <typename T>
262 inline T read(Addr addr)
265 readBlob(addr, (uint8_t*)&d, sizeof(T));
270 #endif //__MEM_PORT_HH__