Abstract PTE list terminator into paging layer

xtoskrnl/mm/amd64/pagemap.cc

@@ -330,6 +330,21 @@ MM::PageMap::GetPteDistance(PMMPTE EndPte,
     return ((ULONG_PTR)EndPte - (ULONG_PTR)StartPte) / sizeof(MMPTE);
 }
 
+/**
+ * Gets the terminator value for a PTE list.
+ *
+ * @return This routine returns the terminator value for a PTE list.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+ULONG_PTR
+MM::PageMap::GetPteListTerminator(VOID)
+{
+    /* Return PTE list terminator value */
+    return 0xFFFFFFFF;
+}
+
 /**
  * Gets the Offset of the PTE (Page Table Entry), that maps given address.
  *