Implement architecture-specific user probe address retrieval

xtoskrnl/mm/paging.cc

@@ -470,6 +470,21 @@ MM::Paging::GetPteVirtualAddress(IN PMMPTE PtePointer)
     return PmlRoutines->GetPteVirtualAddress(PtePointer);
 }
 
+/**
+ * Retrieves the maximum valid memory address accessible to user-mode applications.
+ *
+ * @return This routine returns the user-mode probe address boundary.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+ULONG_PTR
+MM::Paging::GetUserProbeAddress(VOID)
+{
+    /* Return user probe address */
+    return PmlRoutines->GetUserProbeAddress();
+}
+
 /**
  * Gets current status of eXtended Physical Addressing (XPA).
  *