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+
+/*
+ * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
+ * 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.
+ */
+
+#include "mem/ruby/system/PersistentTable.hh"
+#include "mem/gems_common/util.hh"
+
+// randomize so that handoffs are not locality-aware
+// int persistent_randomize[] = {0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15};
+// int persistent_randomize[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
+
+
+PersistentTable::PersistentTable()
+{
+ m_map_ptr = new Map<Address, PersistentTableEntry>;
+}
+
+PersistentTable::~PersistentTable()
+{
+ delete m_map_ptr;
+ m_map_ptr = NULL;
+}
+
+void PersistentTable::persistentRequestLock(const Address& address,
+ MachineID locker,
+ AccessType type)
+{
+
+ // if (locker == m_chip_ptr->getID() )
+ // cout << "Chip " << m_chip_ptr->getID() << ": " << llocker
+ // << " requesting lock for " << address << endl;
+
+ // MachineID locker = (MachineID) persistent_randomize[llocker];
+
+ assert(address == line_address(address));
+ if (!m_map_ptr->exist(address)) {
+ // Allocate if not present
+ PersistentTableEntry entry;
+ entry.m_starving.add(locker);
+ if (type == AccessType_Write) {
+ entry.m_request_to_write.add(locker);
+ }
+ m_map_ptr->add(address, entry);
+ } else {
+ PersistentTableEntry& entry = m_map_ptr->lookup(address);
+
+ //
+ // Make sure we're not already in the locked set
+ //
+ assert(!(entry.m_starving.isElement(locker)));
+
+ entry.m_starving.add(locker);
+ if (type == AccessType_Write) {
+ entry.m_request_to_write.add(locker);
+ }
+ assert(entry.m_marked.isSubset(entry.m_starving));
+ }
+}
+
+void PersistentTable::persistentRequestUnlock(const Address& address,
+ MachineID unlocker)
+{
+ // if (unlocker == m_chip_ptr->getID() )
+ // cout << "Chip " << m_chip_ptr->getID() << ": " << uunlocker
+ // << " requesting unlock for " << address << endl;
+
+ // MachineID unlocker = (MachineID) persistent_randomize[uunlocker];
+
+ assert(address == line_address(address));
+ assert(m_map_ptr->exist(address));
+ PersistentTableEntry& entry = m_map_ptr->lookup(address);
+
+ //
+ // Make sure we're in the locked set
+ //
+ assert(entry.m_starving.isElement(unlocker));
+ assert(entry.m_marked.isSubset(entry.m_starving));
+ entry.m_starving.remove(unlocker);
+ entry.m_marked.remove(unlocker);
+ entry.m_request_to_write.remove(unlocker);
+ assert(entry.m_marked.isSubset(entry.m_starving));
+
+ // Deallocate if empty
+ if (entry.m_starving.isEmpty()) {
+ assert(entry.m_marked.isEmpty());
+ m_map_ptr->erase(address);
+ }
+}
+
+bool PersistentTable::okToIssueStarving(const Address& address,
+ MachineID machId) const
+{
+ assert(address == line_address(address));
+ if (!m_map_ptr->exist(address)) {
+ //
+ // No entry present
+ //
+ return true;
+ } else if (m_map_ptr->lookup(address).m_starving.isElement(machId)) {
+ //
+ // We can't issue another lockdown until are previous unlock has occurred
+ //
+ return false;
+ } else {
+ return (m_map_ptr->lookup(address).m_marked.isEmpty());
+ }
+}
+
+MachineID PersistentTable::findSmallest(const Address& address) const
+{
+ assert(address == line_address(address));
+ assert(m_map_ptr->exist(address));
+ const PersistentTableEntry& entry = m_map_ptr->lookup(address);
+ return entry.m_starving.smallestElement();
+}
+
+AccessType PersistentTable::typeOfSmallest(const Address& address) const
+{
+ assert(address == line_address(address));
+ assert(m_map_ptr->exist(address));
+ const PersistentTableEntry& entry = m_map_ptr->lookup(address);
+ if (entry.m_request_to_write.isElement(entry.m_starving.smallestElement())) {
+ return AccessType_Write;
+ } else {
+ return AccessType_Read;
+ }
+}
+
+void PersistentTable::markEntries(const Address& address)
+{
+ assert(address == line_address(address));
+ if (m_map_ptr->exist(address)) {
+ PersistentTableEntry& entry = m_map_ptr->lookup(address);
+
+ //
+ // None should be marked
+ //
+ assert(entry.m_marked.isEmpty());
+
+ //
+ // Mark all the nodes currently in the table
+ //
+ entry.m_marked = entry.m_starving;
+ }
+}
+
+bool PersistentTable::isLocked(const Address& address) const
+{
+ assert(address == line_address(address));
+ // If an entry is present, it must be locked
+ return (m_map_ptr->exist(address));
+}
+
+int PersistentTable::countStarvingForAddress(const Address& address) const
+{
+ if (m_map_ptr->exist(address)) {
+ PersistentTableEntry& entry = m_map_ptr->lookup(address);
+ return (entry.m_starving.count());
+ }
+ else {
+ return 0;
+ }
+}
+
+int PersistentTable::countReadStarvingForAddress(const Address& address) const
+{
+ if (m_map_ptr->exist(address)) {
+ PersistentTableEntry& entry = m_map_ptr->lookup(address);
+ return (entry.m_starving.count() - entry.m_request_to_write.count());
+ }
+ else {
+ return 0;
+ }
+}
+
+void PersistentTable::print(ostream& out) const
+{
+}
+