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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
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 }