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
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+++ b/src/mem/cache/coherence/uni_coherence.cc
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+/*
+ * 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;
+}