physical.cc (3091:dba513d68c16) physical.cc (3170:37fd1e73f836)
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;

--- 96 unchanged lines hidden (view full) ---

105}
106
107Tick
108PhysicalMemory::calculateLatency(Packet *pkt)
109{
110 return lat;
111}
112
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;

--- 96 unchanged lines hidden (view full) ---

105}
106
107Tick
108PhysicalMemory::calculateLatency(Packet *pkt)
109{
110 return lat;
111}
112
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.
113void
117void
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
114PhysicalMemory::doFunctionalAccess(Packet *pkt)
115{
116 assert(pkt->getAddr() + pkt->getSize() < params()->addrRange.size());
117
118 switch (pkt->cmd) {
119 case Packet::ReadReq:
196PhysicalMemory::doFunctionalAccess(Packet *pkt)
197{
198 assert(pkt->getAddr() + pkt->getSize() < params()->addrRange.size());
199
200 switch (pkt->cmd) {
201 case Packet::ReadReq:
202 if (pkt->req->isLocked()) {
203 trackLoadLocked(pkt->req);
204 }
120 memcpy(pkt->getPtr<uint8_t>(),
121 pmemAddr + pkt->getAddr() - params()->addrRange.start,
122 pkt->getSize());
123 break;
124 case Packet::WriteReq:
205 memcpy(pkt->getPtr<uint8_t>(),
206 pmemAddr + pkt->getAddr() - params()->addrRange.start,
207 pkt->getSize());
208 break;
209 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);
210 if (writeOK(pkt->req)) {
211 memcpy(pmemAddr + pkt->getAddr() - params()->addrRange.start,
212 pkt->getPtr<uint8_t>(), pkt->getSize());
132 }
133 break;
134 default:
135 panic("unimplemented");
136 }
137
138 pkt->result = Packet::Success;
139}

--- 215 unchanged lines hidden --- 		213 }
214 break;
215 default:
216 panic("unimplemented");
217 }
218
219 pkt->result = Packet::Success;
220}

--- 215 unchanged lines hidden ---