1/* 2 * Copyright (c) 2001-2005 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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105} 106 107Tick 108PhysicalMemory::calculateLatency(Packet *pkt) 109{ 110 return lat; 111} 112
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113
114
115// Add load-locked to tracking list. Should only be called if the
116// operation is a load and the LOCKED flag is set.
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113void
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118PhysicalMemory::trackLoadLocked(Request *req)
119{
120 Addr paddr = LockedAddr::mask(req->getPaddr());
121
122 // first we check if we already have a locked addr for this
123 // xc. Since each xc only gets one, we just update the
124 // existing record with the new address.
125 list<LockedAddr>::iterator i;
126
127 for (i = lockedAddrList.begin(); i != lockedAddrList.end(); ++i) {
128 if (i->matchesContext(req)) {
129 DPRINTF(LLSC, "Modifying lock record: cpu %d thread %d addr %#x\n",
130 req->getCpuNum(), req->getThreadNum(), paddr);
131 i->addr = paddr;
132 return;
133 }
134 }
135
136 // no record for this xc: need to allocate a new one
137 DPRINTF(LLSC, "Adding lock record: cpu %d thread %d addr %#x\n",
138 req->getCpuNum(), req->getThreadNum(), paddr);
139 lockedAddrList.push_front(LockedAddr(req));
140}
141
142
143// Called on *writes* only... both regular stores and
144// store-conditional operations. Check for conventional stores which
145// conflict with locked addresses, and for success/failure of store
146// conditionals.
147bool
148PhysicalMemory::checkLockedAddrList(Request *req)
149{
150 Addr paddr = LockedAddr::mask(req->getPaddr());
151 bool isLocked = req->isLocked();
152
153 // Initialize return value. Non-conditional stores always
154 // succeed. Assume conditional stores will fail until proven
155 // otherwise.
156 bool success = !isLocked;
157
158 // Iterate over list. Note that there could be multiple matching
159 // records, as more than one context could have done a load locked
160 // to this location.
161 list<LockedAddr>::iterator i = lockedAddrList.begin();
162
163 while (i != lockedAddrList.end()) {
164
165 if (i->addr == paddr) {
166 // we have a matching address
167
168 if (isLocked && i->matchesContext(req)) {
169 // it's a store conditional, and as far as the memory
170 // system can tell, the requesting context's lock is
171 // still valid.
172 DPRINTF(LLSC, "StCond success: cpu %d thread %d addr %#x\n",
173 req->getCpuNum(), req->getThreadNum(), paddr);
174 success = true;
175 }
176
177 // Get rid of our record of this lock and advance to next
178 DPRINTF(LLSC, "Erasing lock record: cpu %d thread %d addr %#x\n",
179 i->cpuNum, i->threadNum, paddr);
180 i = lockedAddrList.erase(i);
181 }
182 else {
183 // no match: advance to next record
184 ++i;
185 }
186 }
187
188 if (isLocked) {
189 req->setScResult(success ? 1 : 0);
190 }
191
192 return success;
193}
194
195void
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114PhysicalMemory::doFunctionalAccess(Packet *pkt) 115{
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198 assert(pkt->getAddr() + pkt->getSize() < params()->addrRange.size());
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116 assert(pkt->getAddr() + pkt->getSize() <= params()->addrRange.size()); |
117
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200 if (pkt->isRead()) {
201 if (pkt->req->isLocked()) {
202 trackLoadLocked(pkt->req);
203 }
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118 switch (pkt->cmd) { 119 case Packet::ReadReq: |
120 memcpy(pkt->getPtr<uint8_t>(), 121 pmemAddr + pkt->getAddr() - params()->addrRange.start, 122 pkt->getSize());
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207 }
208 else if (pkt->isWrite()) {
209 if (writeOK(pkt->req)) {
210 memcpy(pmemAddr + pkt->getAddr() - params()->addrRange.start,
211 pkt->getPtr<uint8_t>(), pkt->getSize());
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123 break; 124 case Packet::WriteReq: 125 memcpy(pmemAddr + pkt->getAddr() - params()->addrRange.start, 126 pkt->getPtr<uint8_t>(), 127 pkt->getSize()); 128 // temporary hack: will need to add real LL/SC implementation 129 // for cacheless systems later. 130 if (pkt->req->getFlags() & LOCKED) { 131 pkt->req->setScResult(1); |
132 }
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213 }
214 else if (pkt->isInvalidate()) {
215 //upgrade or invalidate
216 pkt->flags |= SATISFIED;
217 }
218 else {
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133 break; 134 default: |
135 panic("unimplemented"); 136 } 137 138 pkt->result = Packet::Success; 139} 140 141Port * 142PhysicalMemory::getPort(const std::string &if_name, int idx) 143{ 144 if (if_name == "port" && idx == -1) { 145 if (port != NULL) 146 panic("PhysicalMemory::getPort: additional port requested to memory!"); 147 port = new MemoryPort(name() + "-port", this); 148 return port; 149 } else if (if_name == "functional") {
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234 /* special port for functional writes at startup. And for memtester */
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150 /* special port for functional writes at startup. */ |
151 return new MemoryPort(name() + "-funcport", this); 152 } else { 153 panic("PhysicalMemory::getPort: unknown port %s requested", if_name); 154 } 155} 156 157void 158PhysicalMemory::recvStatusChange(Port::Status status)
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