diff options
author | Ron Dreslinski <rdreslin@umich.edu> | 2006-06-30 10:25:50 -0400 |
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committer | Ron Dreslinski <rdreslin@umich.edu> | 2006-06-30 10:25:50 -0400 |
commit | 971bb55369a53630349aeb5887cb20599d4396ee (patch) | |
tree | 67104283427ffcf6c0eb463a7d03aac42c57cde1 /src/mem/cache/coherence/uni_coherence.cc | |
parent | 0fbecab797ffe7fc68e3a9af9fd0a21df37ec635 (diff) | |
parent | 335fa4bde33f60bf61dceb04eb61aeade5cee76c (diff) | |
download | gem5-971bb55369a53630349aeb5887cb20599d4396ee.tar.xz |
Merge zizzer:/z/m5/Bitkeeper/newmem
into zazzer.eecs.umich.edu:/z/rdreslin/m5bk/newmem
--HG--
extra : convert_revision : 6eefb4a3ee472f2f2c86ed823c70fc9e5625818f
Diffstat (limited to 'src/mem/cache/coherence/uni_coherence.cc')
-rw-r--r-- | src/mem/cache/coherence/uni_coherence.cc | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/mem/cache/coherence/uni_coherence.cc b/src/mem/cache/coherence/uni_coherence.cc new file mode 100644 index 000000000..5ab706269 --- /dev/null +++ b/src/mem/cache/coherence/uni_coherence.cc @@ -0,0 +1,86 @@ +/* + * Copyright (c) 2003-2005 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Erik Hallnor + */ + +#include "mem/cache/coherence/uni_coherence.hh" +#include "mem/cache/base_cache.hh" + +#include "base/trace.hh" + +using namespace std; + +UniCoherence::UniCoherence() + : cshrs(50) +{ +} + +Packet * +UniCoherence::getPacket() +{ + bool unblock = cshrs.isFull(); + Packet* pkt = cshrs.getReq(); + cshrs.markInService((MSHR*)pkt->senderState); + if (!cshrs.havePending()) { + cache->clearSlaveRequest(Request_Coherence); + } + if (unblock) { + //since CSHRs are always used as buffers, should always get rid of one + assert(!cshrs.isFull()); + cache->clearBlocked(Blocked_Coherence); + } + return pkt; +} + +/** + * @todo add support for returning slave requests, not doing them here. + */ +bool +UniCoherence::handleBusRequest(Packet * &pkt, CacheBlk *blk, MSHR *mshr, + CacheBlk::State &new_state) +{ + new_state = 0; + if (pkt->isInvalidate()) { + DPRINTF(Cache, "snoop inval on blk %x (blk ptr %x)\n", + pkt->getAddr(), blk); + if (!cache->isTopLevel()) { + // Forward to other caches + Packet * tmp = new Packet(pkt->req, Packet::InvalidateReq, -1); + cshrs.allocate(tmp); + cache->setSlaveRequest(Request_Coherence, curTick); + if (cshrs.isFull()) { + cache->setBlockedForSnoop(Blocked_Coherence); + } + } + } else { + if (blk) { + new_state = blk->status; + } + } + return false; +} |