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diff --git a/src/mem/ruby/system/MultiGrainBloomFilter.cc b/src/mem/ruby/system/MultiGrainBloomFilter.cc
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+++ b/src/mem/ruby/system/MultiGrainBloomFilter.cc
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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.
+ */
+
+/*
+ * MultiGrainBloomFilter.C
+ *
+ * Description:
+ *
+ *
+ */
+
+#include "MultiGrainBloomFilter.hh"
+#include "Map.hh"
+#include "Address.hh"
+
+MultiGrainBloomFilter::MultiGrainBloomFilter(string str)
+{
+  string tail(str);
+
+  // split into the 2 filter sizes
+  string head = string_split(tail, '_');
+
+  // head contains size of 1st bloom filter, tail contains size of 2nd bloom filter
+
+  m_filter_size = atoi(head.c_str());
+  m_filter_size_bits = log_int(m_filter_size);
+
+  m_page_filter_size = atoi(tail.c_str());
+  m_page_filter_size_bits = log_int(m_page_filter_size);
+
+  m_filter.setSize(m_filter_size);
+  m_page_filter.setSize(m_page_filter_size);
+  clear();
+}
+
+MultiGrainBloomFilter::~MultiGrainBloomFilter(){
+}
+
+void MultiGrainBloomFilter::clear()
+{
+  for (int i = 0; i < m_filter_size; i++) {
+    m_filter[i] = 0;
+  }
+  for(int i=0; i < m_page_filter_size; ++i){
+    m_page_filter[i] = 0;
+  }
+}
+
+void MultiGrainBloomFilter::increment(const Address& addr)
+{
+  // Not used
+}
+
+
+void MultiGrainBloomFilter::decrement(const Address& addr)
+{
+  // Not used
+}
+
+void MultiGrainBloomFilter::merge(AbstractBloomFilter * other_filter)
+{
+  // TODO
+}
+
+void MultiGrainBloomFilter::set(const Address& addr)
+{
+  int i = get_block_index(addr);
+  int j = get_page_index(addr);
+  assert(i < m_filter_size);
+  assert(j < m_page_filter_size);
+  m_filter[i] = 1;
+  m_page_filter[i] = 1;
+
+}
+
+void MultiGrainBloomFilter::unset(const Address& addr)
+{
+  // not used
+}
+
+bool MultiGrainBloomFilter::isSet(const Address& addr)
+{
+  int i = get_block_index(addr);
+  int j = get_page_index(addr);
+  assert(i < m_filter_size);
+  assert(j < m_page_filter_size);
+  // we have to have both indices set
+  return (m_filter[i] && m_page_filter[i]);
+}
+
+int MultiGrainBloomFilter::getCount(const Address& addr)
+{
+  // not used
+  return 0;
+}
+
+int MultiGrainBloomFilter::getTotalCount()
+{
+  int count = 0;
+
+  for (int i = 0; i < m_filter_size; i++) {
+    count += m_filter[i];
+  }
+
+  for(int i=0; i < m_page_filter_size; ++i){
+    count += m_page_filter[i] = 0;
+  }
+
+  return count;
+}
+
+int MultiGrainBloomFilter::getIndex(const Address& addr)
+{
+  return 0;
+  // TODO
+}
+
+int MultiGrainBloomFilter::readBit(const int index) {
+  return 0;
+  // TODO
+}
+
+void MultiGrainBloomFilter::writeBit(const int index, const int value) {
+  // TODO
+}
+
+void MultiGrainBloomFilter::print(ostream& out) const
+{
+}
+
+int MultiGrainBloomFilter::get_block_index(const Address& addr)
+{
+  // grap a chunk of bits after byte offset
+  return addr.bitSelect( RubyConfig::dataBlockBits(), RubyConfig::dataBlockBits() + m_filter_size_bits - 1);
+}
+
+int MultiGrainBloomFilter::get_page_index(const Address & addr)
+{
+  // grap a chunk of bits after first chunk
+  return addr.bitSelect( RubyConfig::dataBlockBits() + m_filter_size_bits - 1,
+                         RubyConfig::dataBlockBits() + m_filter_size_bits - 1 + m_page_filter_size_bits  - 1);
+}
+
+
+
+