MdeModulePkg/Application/HelloWorld/HelloWorld.c

   1 /** @file
   2   This sample application bases on HelloWorld PCD setting
   3   to print "UEFI Hello World!" to the UEFI Console.
   4
   5   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   6   This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <Uefi.h>
  17 #include <Library/PcdLib.h>
  18 #include <Library/UefiLib.h>
  19 #include <Library/UefiApplicationEntryPoint.h>
  20
  21
  22 /**
  23   The user Entry Point for Application. The user code starts with this function
  24   as the real entry point for the application.
  25
  26   @param[in] ImageHandle    The firmware allocated handle for the EFI image.
  27   @param[in] SystemTable    A pointer to the EFI System Table.
  28
  29   @retval EFI_SUCCESS       The entry point is executed successfully.
  30   @retval other             Some error occurs when executing this entry point.
  31
  32 **/
  33 EFI_STATUS
  34 EFIAPI
  35 UefiMain (
  36   IN EFI_HANDLE        ImageHandle,
  37   IN EFI_SYSTEM_TABLE  *SystemTable
  38   )
  39 {
  40         UINT32 Index;
  41
  42         Index = 0;
  43
  44   //
  45   // Three PCD type (FeatureFlag, UINT32 and String) are used as the sample.
  46   //
  47   if (FeaturePcdGet (PcdHelloWorldPrintEnable)) {
  48         for (Index = 0; Index < PcdGet32 (PcdHelloWorldPrintTimes); Index ++) {
  49           //
  50           // Use UefiLib Print API to print string to UEFI console
  51           //
  52         Print ((CHAR16*)PcdGetPtr (PcdHelloWorldPrintString));
  53     }
  54   }
  55
  56   return EFI_SUCCESS;
  57 }