Implement BlLoadEfiImage() and BlStartEfiImage() routines

xtldr/includes/xtldr.h

@@ -178,6 +178,13 @@ XTCDECL
 EFI_STATUS
 BlInvokeBootProtocol(IN PLIST_ENTRY OptionsList);
 
+XTCDECL
+EFI_STATUS
+BlLoadEfiImage(IN PEFI_DEVICE_PATH_PROTOCOL DevicePath,
+               IN PVOID ImageData,
+               IN SIZE_T ImageSize,
+               OUT PEFI_HANDLE ImageHandle);
+
 XTCDECL
 EFI_STATUS
 BlLoadModule(IN PWCHAR ModuleName);
@@ -289,6 +296,10 @@ XTCDECL
 VOID
 BlSleepExecution(IN ULONG_PTR Milliseconds);
 
+XTCDECL
+EFI_STATUS
+BlStartEfiImage(IN EFI_HANDLE ImageHandle);
+
 XTCDECL
 VOID
 BlStartLoaderShell();