text: // EDK2
  #include <Uefi.h>
  #include <Library/UefiLib.h>
  
  EFI_STATUS EFIAPI UefiMain(IN EFI_HANDLE IH, IN EFI_SYSTEM_TABLE *ST) {
      auto console = ST->ConOut;
      
      //We want blank screen!
      console->ClearScreen(console);
      CHAR16 *msg = L"Hello world!";
      console->OutString(msg); 
  
      // Pause
      while(1);
      //Never get to here, just make compiler happy :)
      return EFI_SUCCESS;
  }