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 - 2016, 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 // String token ID of help message text.
23 // Shell supports to find help message in the resource section of an application image if
24 // .MAN file is not found. This global variable is added to make build tool recognizes
25 // that the help string is consumed by user and then build tool will add the string into
26 // the resource section. Thus the application can use '-?' option to show help message in
27 // Shell.
28 //
29 GLOBAL_REMOVE_IF_UNREFERENCED EFI_STRING_ID mStringHelpTokenId = STRING_TOKEN (STR_HELLO_WORLD_HELP_INFORMATION);
30 
31 /**
32   The user Entry Point for Application. The user code starts with this function
33   as the real entry point for the application.
34 
35   @param[in] ImageHandle    The firmware allocated handle for the EFI image.
36   @param[in] SystemTable    A pointer to the EFI System Table.
37 
38   @retval EFI_SUCCESS       The entry point is executed successfully.
39   @retval other             Some error occurs when executing this entry point.
40 
41 **/
42 EFI_STATUS
43 EFIAPI
UefiMain(IN EFI_HANDLE ImageHandle,IN EFI_SYSTEM_TABLE * SystemTable)44 UefiMain (
45   IN EFI_HANDLE        ImageHandle,
46   IN EFI_SYSTEM_TABLE  *SystemTable
47   )
48 {
49 	UINT32 Index;
50 
51 	Index = 0;
52 
53   //
54   // Three PCD type (FeatureFlag, UINT32 and String) are used as the sample.
55   //
56   if (FeaturePcdGet (PcdHelloWorldPrintEnable)) {
57   	for (Index = 0; Index < PcdGet32 (PcdHelloWorldPrintTimes); Index ++) {
58   	  //
59   	  // Use UefiLib Print API to print string to UEFI console
60   	  //
61     	Print ((CHAR16*)PcdGetPtr (PcdHelloWorldPrintString));
62     }
63   }
64 
65   return EFI_SUCCESS;
66 }
67