firmament/LoaderPkg/Main.c

#include  <Uefi.h>
#include  <Library/UefiLib.h>

EFI_STATUS EFIAPI UefiMain(
    EFI_HANDLE image_handle,
    EFI_SYSTEM_TABLE *system_table) {
  Print(L"Welcome to Firmament.\n");
  while (1);
  return EFI_SUCCESS;
}