2 * Copyright (c) 2006 The Regents of The University of Michigan
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32 * @file Definition of a bus object.
36 #include "base/trace.hh"
38 #include "sim/builder.hh"
41 Bus::getPort(const std::string
&if_name
, int idx
)
43 // if_name ignored? forced to be empty?
44 int id
= interfaces
.size();
45 BusPort
*bp
= new BusPort(csprintf("%s-p%d", name(), id
), this, id
);
46 interfaces
.push_back(bp
);
50 /** Get the ranges of anyone that we are connected to. */
54 std::vector
<Port
*>::iterator intIter
;
55 for (intIter
= interfaces
.begin(); intIter
!= interfaces
.end(); intIter
++)
56 (*intIter
)->sendStatusChange(Port::RangeChange
);
60 /** Function called by the port when the bus is receiving a Timing
63 Bus::recvTiming(Packet
*pkt
)
66 DPRINTF(Bus
, "recvTiming: packet src %d dest %d addr 0x%x cmd %s\n",
67 pkt
->getSrc(), pkt
->getDest(), pkt
->getAddr(), pkt
->cmdString());
69 short dest
= pkt
->getDest();
70 if (dest
== Packet::Broadcast
) {
71 port
= findPort(pkt
->getAddr(), pkt
->getSrc());
73 assert(dest
>= 0 && dest
< interfaces
.size());
74 assert(dest
!= pkt
->getSrc()); // catch infinite loops
75 port
= interfaces
[dest
];
77 if (port
->sendTiming(pkt
)) {
78 // packet was successfully sent, just return true.
82 // packet not successfully sent
83 retryList
.push_back(interfaces
[pkt
->getSrc()]);
88 Bus::recvRetry(int id
)
90 // Go through all the elements on the list calling sendRetry on each
91 // This is not very efficient at all but it works. Ultimately we should end
92 // up with something that is more intelligent.
93 int initialSize
= retryList
.size();
97 for (i
= 0; i
< initialSize
; i
++) {
98 assert(retryList
.size() > 0);
99 p
= retryList
.front();
100 retryList
.pop_front();
107 Bus::findPort(Addr addr
, int id
)
109 /* An interval tree would be a better way to do this. --ali. */
114 while (i
< portList
.size() && !found
)
116 if (portList
[i
].range
== addr
) {
117 dest_id
= portList
[i
].portId
;
119 DPRINTF(Bus
, " found addr 0x%llx on device %d\n", addr
, dest_id
);
124 panic("Unable to find destination for addr: %llx", addr
);
126 // we shouldn't be sending this back to where it came from
127 assert(dest_id
!= id
);
129 return interfaces
[dest_id
];
132 /** Function called by the port when the bus is receiving a Atomic
135 Bus::recvAtomic(Packet
*pkt
)
137 DPRINTF(Bus
, "recvAtomic: packet src %d dest %d addr 0x%x cmd %s\n",
138 pkt
->getSrc(), pkt
->getDest(), pkt
->getAddr(), pkt
->cmdString());
139 assert(pkt
->getDest() == Packet::Broadcast
);
140 return findPort(pkt
->getAddr(), pkt
->getSrc())->sendAtomic(pkt
);
143 /** Function called by the port when the bus is receiving a Functional
146 Bus::recvFunctional(Packet
*pkt
)
148 DPRINTF(Bus
, "recvFunctional: packet src %d dest %d addr 0x%x cmd %s\n",
149 pkt
->getSrc(), pkt
->getDest(), pkt
->getAddr(), pkt
->cmdString());
150 assert(pkt
->getDest() == Packet::Broadcast
);
151 findPort(pkt
->getAddr(), pkt
->getSrc())->sendFunctional(pkt
);
154 /** Function called by the port when the bus is receiving a status change.*/
156 Bus::recvStatusChange(Port::Status status
, int id
)
158 assert(status
== Port::RangeChange
&&
159 "The other statuses need to be implemented.");
161 DPRINTF(BusAddrRanges
, "received RangeChange from device id %d\n", id
);
163 assert(id
< interfaces
.size() && id
>= 0);
165 Port
*port
= interfaces
[id
];
166 AddrRangeList ranges
;
167 AddrRangeList snoops
;
169 std::vector
<DevMap
>::iterator portIter
;
171 // Clean out any previously existent ids
172 for (portIter
= portList
.begin(); portIter
!= portList
.end(); ) {
173 if (portIter
->portId
== id
)
174 portIter
= portList
.erase(portIter
);
179 port
->getPeerAddressRanges(ranges
, snoops
);
181 // not dealing with snooping yet either
182 assert(snoops
.size() == 0);
183 for(iter
= ranges
.begin(); iter
!= ranges
.end(); iter
++) {
188 DPRINTF(BusAddrRanges
, "Adding range %llx - %llx for id %d\n",
189 dm
.range
.start
, dm
.range
.end
, id
);
190 portList
.push_back(dm
);
192 DPRINTF(MMU
, "port list has %d entries\n", portList
.size());
194 // tell all our peers that our address range has changed.
195 // Don't tell the device that caused this change, it already knows
196 for (x
= 0; x
< interfaces
.size(); x
++)
198 interfaces
[x
]->sendStatusChange(Port::RangeChange
);
202 Bus::addressRanges(AddrRangeList
&resp
, AddrRangeList
&snoop
, int id
)
204 std::vector
<DevMap
>::iterator portIter
;
209 DPRINTF(BusAddrRanges
, "received address range request, returning:\n");
210 for (portIter
= portList
.begin(); portIter
!= portList
.end(); portIter
++) {
211 if (portIter
->portId
!= id
) {
212 resp
.push_back(portIter
->range
);
213 DPRINTF(BusAddrRanges
, " -- %#llX : %#llX\n",
214 portIter
->range
.start
, portIter
->range
.end
);
219 BEGIN_DECLARE_SIM_OBJECT_PARAMS(Bus
)
223 END_DECLARE_SIM_OBJECT_PARAMS(Bus
)
225 BEGIN_INIT_SIM_OBJECT_PARAMS(Bus
)
226 INIT_PARAM(bus_id
, "a globally unique bus id")
227 END_INIT_SIM_OBJECT_PARAMS(Bus
)
229 CREATE_SIM_OBJECT(Bus
)
231 return new Bus(getInstanceName(), bus_id
);
234 REGISTER_SIM_OBJECT("Bus", Bus
)