Introduce page directory initialization helper

xtoskrnl/mm/i686/pfn.cc

@@ -10,6 +10,27 @@
 #include <xtos.hh>
 
 
+/**
+ * Allocates and initializes page directory structures for a range of PDEs.
+ *
+ * @param StartingPde
+ *        Supplies a pointer to the first PDE in the range to initialize
+ *
+ * @param EndingPde
+ *        Supplies a pointer to the last PDE in the range to initialize
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+MM::Pfn::InitializePageDirectory(IN PMMPDE StartingPde,
+                                 IN PMMPDE EndingPde)
+{
+    /* Nothing to do */
+}
+
 /**
  * Initializes the PFN database by mapping virtual memory and populating entries.
  *