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diff --git a/src/cpu/inorder/resources/use_def.hh b/src/cpu/inorder/resources/use_def.hh
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+++ b/src/cpu/inorder/resources/use_def.hh
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+/*
+ * Copyright (c) 2007 MIPS Technologies, Inc.
+ * 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: Korey Sewell
+ *
+ */
+
+#ifndef __CPU_INORDER_USE_DEF_UNIT_HH__
+#define __CPU_INORDER_USE_DEF_UNIT_HH__
+
+#include <vector>
+#include <list>
+#include <string>
+
+#include "cpu/func_unit.hh"
+#include "cpu/inorder/first_stage.hh"
+#include "cpu/inorder/resource.hh"
+#include "cpu/inorder/inorder_dyn_inst.hh"
+#include "cpu/inorder/pipeline_traits.hh"
+#include "cpu/inorder/reg_dep_map.hh"
+
+class UseDefUnit : public Resource {
+  public:
+    typedef ThePipeline::DynInstPtr DynInstPtr;
+
+    enum Command {
+        ReadSrcReg,
+        WriteDestReg
+    };
+
+  public:
+    UseDefUnit(std::string res_name, int res_id, int res_width,
+              int res_latency, InOrderCPU *_cpu, ThePipeline::Params *params);
+    virtual ~UseDefUnit() {}
+
+    virtual ResourceRequest* getRequest(DynInstPtr _inst, int stage_num,
+                                        int res_idx, int slot_num,
+                                        unsigned cmd);
+
+    virtual ResReqPtr findRequest(DynInstPtr inst);
+
+    virtual void execute(int slot_num);
+
+    virtual void squash(DynInstPtr inst, int stage_num, InstSeqNum squash_seq_num, unsigned tid);
+
+    const InstSeqNum maxSeqNum;
+
+  protected:
+    RegDepMap *regDepMap[ThePipeline::MaxThreads];
+
+    /** Outstanding Seq. Num. Trying to Read from Register File */
+    InstSeqNum outReadSeqNum[ThePipeline::MaxThreads];
+
+    InstSeqNum outWriteSeqNum[ThePipeline::MaxThreads];
+
+    bool *nonSpecInstActive[ThePipeline::MaxThreads];
+
+    InstSeqNum *nonSpecSeqNum[ThePipeline::MaxThreads];
+
+    /** @todo: Add Resource Stats Here */
+
+  public:
+    class UseDefRequest : public ResourceRequest {
+      public:
+        typedef ThePipeline::DynInstPtr DynInstPtr;
+
+      public:
+        UseDefRequest(UseDefUnit *res, DynInstPtr inst, int stage_num, int res_idx,
+                      int slot_num, unsigned cmd, int use_def_idx)
+            : ResourceRequest(res, inst, stage_num, res_idx, slot_num, cmd),
+              useDefIdx(use_def_idx)
+        { }
+
+        int useDefIdx;
+    };
+};
+
+#endif //__CPU_INORDER_USE_DEF_UNIT_HH__