port.cc (5489:94a7bb476fca) port.cc (5494:85c8d296c1cb)
1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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34 */
35#include <cstring>
36
37#include "base/chunk_generator.hh"
38#include "base/trace.hh"
39#include "mem/mem_object.hh"
40#include "mem/port.hh"
41
1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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34 */
35#include <cstring>
36
37#include "base/chunk_generator.hh"
38#include "base/trace.hh"
39#include "mem/mem_object.hh"
40#include "mem/port.hh"
41
42/**
43 * Special class for port objects that are used as peers for
44 * unconnected ports. Assigning instances of this class to newly
45 * allocated ports allows us to guarantee that every port has a peer
46 * object (so there's no need to check for null peer pointers), while
47 * catching uses of unconnected ports.
48 */
49class DefaultPeerPort : public Port
50{
51 protected:
52 void blowUp()
53 {
42class DefaultPeerPort : public Port
43{
44 protected:
45 void blowUp()
46 {
54 Port *peer = getPeer();
55 fatal("unconnected port: %s", peer ? peer->name() : "<unknown>");
47 fatal("%s: Unconnected port!", peer->name());
56 }
57
58 public:
48 }
49
50 public:
59 DefaultPeerPort(Port *_peer)
60 : Port("default_port", NULL, _peer)
51 DefaultPeerPort()
52 : Port("default_port")
61 { }
62
63 bool recvTiming(PacketPtr)
64 {
65 blowUp();
66 return false;
67 }
68

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91 void getDeviceAddressRanges(AddrRangeList &, bool &)
92 {
93 blowUp();
94 }
95
96 bool isDefaultPort() const { return true; }
97};
98
53 { }
54
55 bool recvTiming(PacketPtr)
56 {
57 blowUp();
58 return false;
59 }
60

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83 void getDeviceAddressRanges(AddrRangeList &, bool &)
84 {
85 blowUp();
86 }
87
88 bool isDefaultPort() const { return true; }
89};
90
91DefaultPeerPort defaultPeerPort;
99
92
100Port::Port(const std::string &_name, MemObject *_owner, Port *_peer) :
101 portName(_name),
102 peer(_peer ? _peer : new DefaultPeerPort(this)),
103 owner(_owner)
93Port::Port()
94 : peer(&defaultPeerPort), owner(NULL)
104{
105}
106
95{
96}
97
107Port::~Port()
98Port::Port(const std::string &_name, MemObject *_owner)
99 : portName(_name), peer(&defaultPeerPort), owner(_owner)
108{
100{
109 disconnectFromPeer();
110}
111
101}
102
112void
113Port::disconnectFromPeer()
103Port::~Port()
114{
104{
115 if (peer) {
116 assert(peer->getPeer() == this);
117 peer->disconnect();
118 }
119}
120
121void
105}
106
107void
122Port::disconnect()
108Port::setPeer(Port *port)
123{
109{
124 // This notification should come only from our peer, so we must
125 // have one,
126 assert(peer != NULL);
127 // We must clear 'peer' here, else if owner->deletePort() calls
128 // delete on us then we'll recurse infinitely through the Port
129 // destructor.
130 peer = NULL;
131 // If owner->deletePort() returns true, then we've been deleted,
132 // so don't do anything but get out of here. If not, reset peer
133 // pointer to a DefaultPeerPort.
134 if (!(owner && owner->deletePort(this)))
135 peer = new DefaultPeerPort(this);
110 DPRINTF(Config, "setting peer to %s\n", port->name());
111
112 peer = port;
136}
137
138void
113}
114
115void
139Port::setPeer(Port *port)
116Port::removeConn()
140{
117{
141 DPRINTF(Config, "setting peer to %s, old peer %s\n",
142 port->name(), peer ? peer->name() : "<null>");
143
144 // You'd think we'd want to disconnect from the previous peer
145 // here, but it turns out that with some functional ports the old
146 // peer keeps using the connection, and it works because
147 // functional ports are unidirectional.
148 //
149 // disconnectFromPeer();
150
151 peer = port;
118 if (peer->getOwner())
119 peer->getOwner()->deletePortRefs(peer);
120 peer = NULL;
152}
153
154void
155Port::blobHelper(Addr addr, uint8_t *p, int size, MemCmd cmd)
156{
157 Request req;
158
159 for (ChunkGenerator gen(addr, size, peerBlockSize());

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122
123void
124Port::blobHelper(Addr addr, uint8_t *p, int size, MemCmd cmd)
125{
126 Request req;
127
128 for (ChunkGenerator gen(addr, size, peerBlockSize());

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