# Node ID d3f20078bf20f1217b3664d1e3e6df716bb6f57a
# Parent  13edc18b6c47e0f788c8a0e79c96f101dec318e9
diff --git a/src/mem/ruby/structures/AbstractReplacementPolicy.hh b/src/mem/ruby/structures/AbstractReplacementPolicy.hh
--- a/src/mem/ruby/structures/AbstractReplacementPolicy.hh
+++ b/src/mem/ruby/structures/AbstractReplacementPolicy.hh
@@ -34,6 +34,8 @@
 #include "params/ReplacementPolicy.hh"
 #include "sim/sim_object.hh"
 
+class CacheMemory;
+
 class AbstractReplacementPolicy : public SimObject
 {
   public:
@@ -52,6 +54,9 @@
 
     virtual bool useOccupancy() const { return false; }
 
+    void setCache(CacheMemory * pCache) {m_cache = pCache;}
+    CacheMemory * m_cache;
+
   protected:
     unsigned m_num_sets;       /** total number of sets */
     unsigned m_assoc;          /** set associativity */
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
@@ -97,6 +97,8 @@
     Cycles getTagLatency() const { return tagArray.getLatency(); }
     Cycles getDataLatency() const { return dataArray.getLatency(); }
 
+    bool isBlockInvalid(int64 cache_set, int64 loc);
+    bool isBlockNotBusy(int64 cache_set, int64 loc);
 
     // Hook for checkpointing the contents of the cache
     void recordCacheContents(int cntrl, CacheRecorder* tr) const;
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
@@ -61,6 +61,7 @@
     m_latency = p->latency;
     m_cache_assoc = p->assoc;
     m_replacementPolicy_ptr = p->replacement_policy;
+    m_replacementPolicy_ptr->setCache(this);
     m_start_index_bit = p->start_index_bit;
     m_is_instruction_only_cache = p->is_icache;
     m_resource_stalls = p->resourceStalls;
@@ -616,3 +617,15 @@
         return true;
     }
 }
+
+bool
+CacheMemory::isBlockInvalid(int64 cache_set, int64 loc)
+{
+  return (m_cache[cache_set][loc]->m_Permission == AccessPermission_Invalid);
+}
+
+bool
+CacheMemory::isBlockNotBusy(int64 cache_set, int64 loc)
+{
+  return (m_cache[cache_set][loc]->m_Permission != AccessPermission_Busy);
+}