diff --git a/src/mem/ruby/structures/CacheMemory.cc b/src/mem/ruby/structures/CacheMemory.cc
--- a/src/mem/ruby/structures/CacheMemory.cc
+++ b/src/mem/ruby/structures/CacheMemory.cc
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1999-2012 Mark D. Hill and David A. Wood
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -132,6 +133,29 @@
     return -1; // Not found
 }
 
+// Given an unique cache block identifier (idx): return the valid address
+// stored by the cache block.  If the block is invalid/notpresent, the
+// function returns the 0 address
+Address
+CacheMemory::getTagIdx(int idx) const
+{
+    Address tmp(0);
+
+    int set = idx / m_cache_assoc;
+    assert(set < m_cache_num_sets);
+
+    int way = idx - set * m_cache_assoc;
+    assert (way < m_cache_assoc);
+
+    AbstractCacheEntry* entry = m_cache[set][way];
+    if (entry == NULL ||
+        entry->m_Permission == AccessPermission_Invalid ||
+        entry->m_Permission == AccessPermission_NotPresent) {
+        return tmp;
+    }
+    return entry->m_Address;
+}
+
 bool
 CacheMemory::tryCacheAccess(const Address& address, RubyRequestType type,
                             DataBlock*& data_ptr)
# Node ID a19dfa9c539172df497b64565afd12cae8e97357
# Parent  2d0cfebc0aa5d3c77310db5d3877a6ee170e677f
diff --git a/src/mem/protocol/RubySlicc_Types.sm b/src/mem/protocol/RubySlicc_Types.sm
--- a/src/mem/protocol/RubySlicc_Types.sm
+++ b/src/mem/protocol/RubySlicc_Types.sm
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1999-2005 Mark D. Hill and David A. Wood
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -155,6 +156,10 @@
   void recordRequestType(CacheRequestType);
   bool checkResourceAvailable(CacheResourceType, Address);
 
+  int getCacheSize();
+  int getNumBlocks();
+  Address getTagIdx(int);
+
   Scalar demand_misses;
   Scalar demand_hits;
 }
diff --git a/src/mem/ruby/structures/CacheMemory.hh b/src/mem/ruby/structures/CacheMemory.hh
--- a/src/mem/ruby/structures/CacheMemory.hh
+++ b/src/mem/ruby/structures/CacheMemory.hh
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1999-2012 Mark D. Hill and David A. Wood
+ * Copyright (c) 2013 Advanced Micro Devices, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -131,6 +132,10 @@
     Stats::Scalar numTagArrayStalls;
     Stats::Scalar numDataArrayStalls;
 
+    int getCacheSize() const { return m_cache_size; }
+    int getNumBlocks() const { return m_cache_num_sets * m_cache_assoc; }
+    Address getTagIdx(int idx) const;
+
   private:
     // convert a Address to its location in the cache
     int64 addressToCacheSet(const Address& address) const;