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+/*
+ * Copyright (c) 2002-2005 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
+ * Dave Greene
+ */
+
+/**
+ * @file
+ * Miss Status and Handling Register (MSHR) definitions.
+ */
+
+#include <assert.h>
+#include <string>
+#include <vector>
+
+#include "mem/cache/miss/mshr.hh"
+#include "sim/root.hh" // for curTick
+#include "sim/host.hh"
+#include "base/misc.hh"
+#include "mem/cache/cache.hh"
+
+using namespace std;
+
+MSHR::MSHR()
+{
+ inService = false;
+ ntargets = 0;
+ threadNum = -1;
+}
+
+void
+MSHR::allocate(Packet::Command cmd, Addr _addr, int _asid, int size,
+ Packet * &target)
+{
+ assert(targets.empty());
+ addr = _addr;
+ asid = _asid;
+
+ pkt = new Packet(); // allocate new memory request
+ pkt->addr = addr; //picked physical address for now
+ pkt->cmd = cmd;
+ pkt->size = size;
+ pkt->data = new uint8_t[size];
+ pkt->senderState = this;
+ //Set the time here for latency calculations
+ //pkt->time = curTick;
+
+ if (target) {
+ pkt->req = target->req;
+ allocateTarget(target);
+ }
+}
+
+// Since we aren't sure if data is being used, don't copy here.
+/**
+ * @todo When we have a "global" data flag, might want to copy data here.
+ */
+void
+MSHR::allocateAsBuffer(Packet * &target)
+{
+ addr = target->paddr;
+ asid = target->req->asid;
+ threadNum = target->thread_num;
+ pkt = new Packet();
+ pkt->addr = target->addr;
+ pkt->dest = target->dest;
+ pkt->cmd = target->cmd;
+ pkt->size = target->size;
+ pkt->req = target->req;
+ pkt->data = new uint8_t[target->size];
+ pkt->senderState = this;
+}
+
+void
+MSHR::deallocate()
+{
+ assert(targets.empty());
+ assert(ntargets == 0);
+ pkt = NULL;
+ inService = false;
+ allocIter = NULL;
+ readyIter = NULL;
+}
+
+/*
+ * Adds a target to an MSHR
+ */
+void
+MSHR::allocateTarget(Packet * &target)
+{
+ //If we append an invalidate and we issued a read to the bus,
+ //but now have some pending writes, we need to move
+ //the invalidate to before the first non-read
+ if (inService && pkt->cmd.isRead() && target->cmd.isInvalidate()) {
+ std::list<Packet *> temp;
+
+ while (!targets.empty()) {
+ if (!targets.front()->cmd.isRead()) break;
+ //Place on top of temp stack
+ temp.push_front(targets.front());
+ //Remove from targets
+ targets.pop_front();
+ }
+
+ //Now that we have all the reads off until first non-read, we can
+ //place the invalidate on
+ targets.push_front(target);
+
+ //Now we pop off the temp_stack and put them back
+ while (!temp.empty()) {
+ targets.push_front(temp.front());
+ temp.pop_front();
+ }
+ }
+ else {
+ targets.push_back(target);
+ }
+
+ ++ntargets;
+ assert(targets.size() == ntargets);
+ /**
+ * @todo really prioritize the target commands.
+ */
+
+ if (!inService && target->cmd.isWrite()) {
+ pkt->cmd = WriteReq;
+ }
+}
+
+
+
+void
+MSHR::dump()
+{
+ ccprintf(cerr,
+ "inService: %d thread: %d\n"
+ "Addr: %x asid: %d ntargets %d\n"
+ "Targets:\n",
+ inService, threadNum, addr, asid, ntargets);
+
+ TargetListIterator tar_it = targets.begin();
+ for (int i = 0; i < ntargets; i++) {
+ assert(tar_it != targets.end());
+
+ ccprintf(cerr, "\t%d: Addr: %x cmd: %d\n",
+ i, (*tar_it)->paddr, (*tar_it)->cmd.toIndex());
+
+ tar_it++;
+ }
+ ccprintf(cerr, "\n");
+}
+
+MSHR::~MSHR()
+{
+ if (pkt)
+ pkt = NULL;
+}