MdeModulePkg/Application/HelloWorld/HelloWorld.c

   1 /** @file
   2   This simple application just print a "UEFI Hello World!" to the UEFI Console.
   3
   4   Copyright (c) 2006 - 2007, Intel Corporation
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <Uefi.h>
  16 #include <Library/PcdLib.h>
  17 #include <Library/DebugLib.h>
  18 #include <Library/UefiLib.h>
  19 #include <Library/UefiApplicationEntryPoint.h>
  20 #include <Library/UefiBootServicesTableLib.h>
  21
  22
  23 /**
  24   The user Entry Point for Application. The user code starts with this function
  25   as the real entry point for the image goes into a library that calls this
  26   function.
  27
  28   @param[in] ImageHandle    The firmware allocated handle for the EFI image.
  29   @param[in] SystemTable    A pointer to the EFI System Table.
  30
  31   @retval EFI_SUCCESS       The entry point is executed successfully.
  32   @retval other             Some error occurs when executing this entry point.
  33
  34 **/
  35 EFI_STATUS
  36 EFIAPI
  37 UefiMain (
  38   IN EFI_HANDLE        ImageHandle,
  39   IN EFI_SYSTEM_TABLE  *SystemTable
  40   )
  41 {
  42         UINT32 Index;
  43
  44         Index = 0;
  45
  46   //
  47   // Three PCD type (FeatureFlag, UINT32 and String) are used as the sample.
  48   //
  49   if (FeaturePcdGet (PcdHelloWorldPrintEnable)) {
  50         for (Index = 0; Index < PcdGet32 (PcdHelloWorldPrintTimes); Index ++) {
  51         Print ((CHAR16*)PcdGetPtr (PcdHelloWorldPrintString));
  52     }
  53   }
  54
  55   return EFI_SUCCESS;
  56 }