mirror of https://github.com/acidanthera/audk.git
84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/** @file
|
|
Utility routines used by boot maintenance modules.
|
|
|
|
Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#include "BootMaintenanceManager.h"
|
|
|
|
/**
|
|
Function deletes the variable specified by VarName and VarGuid.
|
|
|
|
@param VarName A Null-terminated Unicode string that is
|
|
the name of the vendor's variable.
|
|
|
|
@param VarGuid A unique identifier for the vendor.
|
|
|
|
@retval EFI_SUCCESS The variable was found and removed
|
|
@retval EFI_UNSUPPORTED The variable store was inaccessible
|
|
@retval EFI_NOT_FOUND The variable was not found
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EfiLibDeleteVariable (
|
|
IN CHAR16 *VarName,
|
|
IN EFI_GUID *VarGuid
|
|
)
|
|
{
|
|
return gRT->SetVariable (
|
|
VarName,
|
|
VarGuid,
|
|
0,
|
|
0,
|
|
NULL
|
|
);
|
|
}
|
|
|
|
/**
|
|
Function is used to determine the number of device path instances
|
|
that exist in a device path.
|
|
|
|
|
|
@param DevicePath A pointer to a device path data structure.
|
|
|
|
@return This function counts and returns the number of device path instances
|
|
in DevicePath.
|
|
|
|
**/
|
|
UINTN
|
|
EfiDevicePathInstanceCount (
|
|
IN EFI_DEVICE_PATH_PROTOCOL *DevicePath
|
|
)
|
|
{
|
|
UINTN Count;
|
|
UINTN Size;
|
|
|
|
Count = 0;
|
|
while (GetNextDevicePathInstance (&DevicePath, &Size) != NULL) {
|
|
Count += 1;
|
|
}
|
|
|
|
return Count;
|
|
}
|
|
|
|
/**
|
|
Get a string from the Data Hub record based on
|
|
a device path.
|
|
|
|
@param DevPath The device Path.
|
|
|
|
@return A string located from the Data Hub records based on
|
|
the device path.
|
|
@retval NULL If failed to get the String from Data Hub.
|
|
|
|
**/
|
|
UINT16 *
|
|
EfiLibStrFromDatahub (
|
|
IN EFI_DEVICE_PATH_PROTOCOL *DevPath
|
|
)
|
|
{
|
|
return NULL;
|
|
}
|