Implement BlMapVirtualMemory() routine for recursive mapping

xtldr/includes/xtbl.h

@@ -111,6 +111,13 @@ BlInitializeVirtualMemory(IN OUT PLIST_ENTRY MemoryMappings,
 EFI_STATUS
 BlLoadEfiModules();
 
+EFI_STATUS
+BlMapVirtualMemory(IN PLIST_ENTRY MemoryMappings,
+                   IN UINT_PTR VirtualAddress,
+                   IN UINT_PTR PhysicalAddress,
+                   IN UINT NumberOfPages,
+                   IN OUT PHARDWARE_PTE *PtePointer);
+
 EFI_STATUS
 BlOpenVolume(IN PEFI_DEVICE_PATH_PROTOCOL DevicePath,
              OUT PEFI_HANDLE DiskHandle,