Add MM::PageMap::GetXpaStatus() for querying PML level

xtoskrnl/includes/mm/i686/pagemap.hh

@@ -39,6 +39,7 @@ namespace MM
             XTAPI ULONG GetPteIndex(IN PVOID Address);
             VIRTUAL XTAPI ULONG GetPteSize(VOID) = 0;
             XTAPI PVOID GetPteVirtualAddress(IN PMMPTE PtePointer);
+            XTAPI BOOLEAN GetXpaStatus();
             VIRTUAL XTAPI VOID InitializePageMapInfo(VOID) = 0;
             VIRTUAL XTAPI BOOLEAN PteValid(IN PMMPTE PtePointer) = 0;
             VIRTUAL XTAPI VOID SetNextEntry(IN PMMPTE Pte,

xtoskrnl/mm/i686/pagemap.cc

@@ -210,6 +210,20 @@ MM::PageMap::GetPteVirtualAddress(IN PMMPTE PtePointer)
     return ((PVOID)((ULONG)(PtePointer) << 10));
 }
 
+/**
+ * Gets the status of Extended Paging Address (XPA) mode.
+ *
+ * @return This routine returns TRUE if XPA is enabled, FALSE otherwise.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+BOOLEAN
+MM::PageMap::GetXpaStatus()
+{
+    return PageMapInfo.Xpa;
+}
+
 /**
  * Advances a PTE pointer by a given number of entries, considering the actual PTE size for PML2.
  *