Abstract PTE list terminator into paging layer

xtoskrnl/mm/i686/pagemap.cc

@@ -340,6 +340,21 @@ MM::PageMapBasic::GetPteDistance(PMMPTE EndPte,
     return ((ULONG_PTR)EndPte - (ULONG_PTR)StartPte) / sizeof(MMPML2_PTE);
 }
 
+/**
+ * Gets the terminator value for a PTE list (PML2).
+ *
+ * @return This routine returns the terminator value for a PTE list.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+ULONG_PTR
+MM::PageMapBasic::GetPteListTerminator(VOID)
+{
+    /* Return PTE list terminator value for PML2 */
+    return 0xFFFFF;
+}
+
 /**
  * Gets the size of a PTE for basic paging (PML2).
  *
@@ -813,6 +828,21 @@ MM::PageMapXpa::GetPteDistance(PMMPTE EndPte,
     return ((ULONG_PTR)EndPte - (ULONG_PTR)StartPte) / sizeof(MMPML3_PTE);
 }
 
+/**
+ * Gets the terminator value for a PTE list (PML3).
+ *
+ * @return This routine returns the terminator value for a PTE list.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+ULONG_PTR
+MM::PageMapXpa::GetPteListTerminator(VOID)
+{
+    /* Return PTE list terminator value for PML3 */
+    return 0xFFFFFFFF;
+}
+
 /**
  * Gets the size of a PTE for XPA paging (PML3).
  *