MdeModulePkg/Library/BootMaintenanceManagerUiLib/BmLib.c

   1 /** @file
   2 Utility routines used by boot maintenance modules.
   3
   4 Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
   5 SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "BootMaintenanceManager.h"
  10
  11 /**
  12   Function deletes the variable specified by VarName and VarGuid.
  13
  14   @param VarName           A Null-terminated Unicode string that is
  15                            the name of the vendor's variable.
  16
  17   @param VarGuid           A unique identifier for the vendor.
  18
  19   @retval  EFI_SUCCESS           The variable was found and removed
  20   @retval  EFI_UNSUPPORTED       The variable store was inaccessible
  21   @retval  EFI_NOT_FOUND         The variable was not found
  22
  23 **/
  24 EFI_STATUS
  25 EfiLibDeleteVariable (
  26   IN CHAR16   *VarName,
  27   IN EFI_GUID *VarGuid
  28   )
  29 {
  30   return gRT->SetVariable (
  31                 VarName,
  32                 VarGuid,
  33                 0,
  34                 0,
  35                 NULL
  36                 );
  37 }
  38
  39 /**
  40   Function is used to determine the number of device path instances
  41   that exist in a device path.
  42
  43
  44   @param DevicePath      A pointer to a device path data structure.
  45
  46   @return This function counts and returns the number of device path instances
  47           in DevicePath.
  48
  49 **/
  50 UINTN
  51 EfiDevicePathInstanceCount (
  52   IN EFI_DEVICE_PATH_PROTOCOL      *DevicePath
  53   )
  54 {
  55   UINTN Count;
  56   UINTN Size;
  57
  58   Count = 0;
  59   while (GetNextDevicePathInstance (&DevicePath, &Size) != NULL) {
  60     Count += 1;
  61   }
  62
  63   return Count;
  64 }
  65
  66 /**
  67   Get a string from the Data Hub record based on
  68   a device path.
  69
  70   @param DevPath         The device Path.
  71
  72   @return A string located from the Data Hub records based on
  73           the device path.
  74   @retval NULL  If failed to get the String from Data Hub.
  75
  76 **/
  77 UINT16 *
  78 EfiLibStrFromDatahub (
  79   IN EFI_DEVICE_PATH_PROTOCOL                 *DevPath
  80   )
  81 {
  82   return NULL;
  83 }