diff --git a/src/mem/request.hh b/src/mem/request.hh
--- a/src/mem/request.hh
+++ b/src/mem/request.hh
@@ -320,6 +320,24 @@
     }
 
     /**
+     * Generate two requests as if this request had been split into two
+     * pieces. The original request should have already been translated
+     * to a physical address.
+     */
+    void splitOnPaddr(Addr split_addr, RequestPtr &req1, RequestPtr &req2)
+    {
+        assert(privateFlags.isSet(VALID_PADDR));
+        assert(split_addr > _paddr && split_addr < _paddr + _size);
+        req1 = new Request;
+        *req1 = *this;
+        req2 = new Request;
+        *req2 = *this;
+        req1->_size = split_addr - _paddr;
+        req2->_paddr = split_addr;
+        req2->_size = _size - req1->_size;
+    }
+
+    /**
      * Accessor for paddr.
      */
     bool