Implement BlCloseVolume() and BlOpenVolume() routines

xtldr/includes/xtbl.h

@@ -22,6 +22,9 @@ EXTERN PEFI_SYSTEM_TABLE EfiSystemTable;
 /* Serial port configuration */
 EXTERN CPPORT EfiSerialPort;
 
+EFI_STATUS
+BlCloseVolume(IN PEFI_HANDLE VolumeHandle);
+
 EFI_STATUS
 BlComPortInitialize();
 
@@ -68,6 +71,11 @@ BlGetXtLoaderProtocol(EFI_HANDLE ImageHandle,
 EFI_STATUS
 BlLoadEfiModules();
 
+EFI_STATUS
+BlOpenVolume(IN PEFI_DEVICE_PATH_PROTOCOL DevicePath,
+             OUT PEFI_HANDLE DiskHandle,
+             OUT PEFI_FILE_HANDLE *FsHandle);
+
 EFI_STATUS
 BlpRegisterXtLoaderProtocol();