Implement more wrappers and refactoring

xtldr2/efiutils.c

@@ -94,6 +94,31 @@ BlSleepExecution(IN ULONG_PTR Milliseconds)
     EfiSystemTable->BootServices->Stall(Milliseconds * 1000);
 }
 
+/**
+ * Waits for one or more EFI events.
+ *
+ * @param NumberOfEvents
+ *        Supplies the number of events to wait for.
+ *
+ * @param Event
+ *        Supplies the array of events to wait for.
+ *
+ * @param Index
+ *        Receives the index of the event that was signaled.
+ *
+ * @return This routine returns status code.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+EFI_STATUS
+BlWaitForEfiEvent(IN UINT_PTR NumberOfEvents,
+                  IN PEFI_EVENT Event,
+                  OUT PUINT_PTR Index)
+{
+    return EfiSystemTable->BootServices->WaitForEvent(NumberOfEvents, Event, Index);
+}
+
 /**
  * Initializes EFI Boot Loader (XTLDR).
  *