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40 * Authors: Ron Dreslinski
48 * Declaration of a non-coherent bus.
51 #ifndef __MEM_NONCOHERENT_BUS_HH__
52 #define __MEM_NONCOHERENT_BUS_HH__
55 #include "params/NoncoherentBus.hh"
58 * A non-coherent bus connects a number of non-snooping masters and
59 * slaves, and routes the request and response packets based on the
60 * address. The request packets issued by the master connected to a
61 * non-coherent bus could still snoop in caches attached to a coherent
62 * bus, as is the case with the I/O bus and memory bus in most system
63 * configurations. No snoops will, however, reach any master on the
64 * non-coherent bus itself.
66 * The non-coherent bus can be used as a template for modelling PCI,
67 * PCIe, and non-coherent AMBA and OCP buses, and is typically used
70 class NoncoherentBus : public BaseBus
76 * Declaration of the non-coherent bus slave port type, one will
77 * be instantiated for each of the master ports connecting to the
80 class NoncoherentBusSlavePort : public SlavePort
84 /** A reference to the bus to which this port belongs. */
89 NoncoherentBusSlavePort(const std::string &_name,
90 NoncoherentBus &_bus, PortID _id)
91 : SlavePort(_name, &_bus, _id), bus(_bus)
97 * When receiving a timing request, pass it to the bus.
99 virtual bool recvTimingReq(PacketPtr pkt)
100 { return bus.recvTimingReq(pkt, id); }
103 * When receiving an atomic request, pass it to the bus.
105 virtual Tick recvAtomic(PacketPtr pkt)
106 { return bus.recvAtomic(pkt, id); }
109 * When receiving a functional request, pass it to the bus.
111 virtual void recvFunctional(PacketPtr pkt)
112 { bus.recvFunctional(pkt, id); }
115 * When receiving a retry, pass it to the bus.
117 virtual void recvRetry()
118 { panic("Bus slave ports always succeed and should never retry.\n"); }
121 * Return the union of all adress ranges seen by this bus.
123 virtual AddrRangeList getAddrRanges()
124 { return bus.getAddrRanges(); }
127 * Get the maximum block size as seen by the bus.
129 virtual unsigned deviceBlockSize() const
130 { return bus.findBlockSize(); }
135 * Declaration of the bus master port type, one will be
136 * instantiated for each of the slave ports connecting to the
139 class NoncoherentBusMasterPort : public MasterPort
143 /** A reference to the bus to which this port belongs. */
148 NoncoherentBusMasterPort(const std::string &_name,
149 NoncoherentBus &_bus, PortID _id)
150 : MasterPort(_name, &_bus, _id), bus(_bus)
156 * When receiving a timing response, pass it to the bus.
158 virtual bool recvTimingResp(PacketPtr pkt)
159 { return bus.recvTimingResp(pkt, id); }
161 /** When reciving a range change from the peer port (at id),
162 pass it to the bus. */
163 virtual void recvRangeChange()
164 { bus.recvRangeChange(id); }
166 /** When reciving a retry from the peer port (at id),
167 pass it to the bus. */
168 virtual void recvRetry()
172 * Get the maximum block size as seen by the bus.
174 virtual unsigned deviceBlockSize() const
175 { return bus.findBlockSize(); }
179 /** Function called by the port when the bus is recieving a Timing
181 virtual bool recvTimingReq(PacketPtr pkt, PortID slave_port_id);
183 /** Function called by the port when the bus is recieving a Timing
185 virtual bool recvTimingResp(PacketPtr pkt, PortID master_port_id);
187 /** Function called by the port when the bus is recieving a Atomic
189 Tick recvAtomic(PacketPtr pkt, PortID slave_port_id);
191 /** Function called by the port when the bus is recieving a Functional
193 void recvFunctional(PacketPtr pkt, PortID slave_port_id);
197 NoncoherentBus(const NoncoherentBusParams *p);
201 #endif //__MEM_NONCOHERENT_BUS_HH__