1 /** @file
2 Utility routines used by boot maintenance modules.
3
4 Copyright (c) 2004 - 2015, Intel Corporation. All rights reserved.<BR>
5 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 "BootMaintenanceManager.h"
16
17 /**
18 Function deletes the variable specified by VarName and VarGuid.
19
20 @param VarName A Null-terminated Unicode string that is
21 the name of the vendor's variable.
22
23 @param VarGuid A unique identifier for the vendor.
24
25 @retval EFI_SUCCESS The variable was found and removed
26 @retval EFI_UNSUPPORTED The variable store was inaccessible
27 @retval EFI_NOT_FOUND The variable was not found
28
29 **/
30 EFI_STATUS
EfiLibDeleteVariable(IN CHAR16 * VarName,IN EFI_GUID * VarGuid)31 EfiLibDeleteVariable (
32 IN CHAR16 *VarName,
33 IN EFI_GUID *VarGuid
34 )
35 {
36 return gRT->SetVariable (
37 VarName,
38 VarGuid,
39 0,
40 0,
41 NULL
42 );
43 }
44
45 /**
46 Function is used to determine the number of device path instances
47 that exist in a device path.
48
49
50 @param DevicePath A pointer to a device path data structure.
51
52 @return This function counts and returns the number of device path instances
53 in DevicePath.
54
55 **/
56 UINTN
EfiDevicePathInstanceCount(IN EFI_DEVICE_PATH_PROTOCOL * DevicePath)57 EfiDevicePathInstanceCount (
58 IN EFI_DEVICE_PATH_PROTOCOL *DevicePath
59 )
60 {
61 UINTN Count;
62 UINTN Size;
63
64 Count = 0;
65 while (GetNextDevicePathInstance (&DevicePath, &Size) != NULL) {
66 Count += 1;
67 }
68
69 return Count;
70 }
71
72 /**
73 Get a string from the Data Hub record based on
74 a device path.
75
76 @param DevPath The device Path.
77
78 @return A string located from the Data Hub records based on
79 the device path.
80 @retval NULL If failed to get the String from Data Hub.
81
82 **/
83 UINT16 *
EfiLibStrFromDatahub(IN EFI_DEVICE_PATH_PROTOCOL * DevPath)84 EfiLibStrFromDatahub (
85 IN EFI_DEVICE_PATH_PROTOCOL *DevPath
86 )
87 {
88 return NULL;
89 }
90