14a746bb6a
This change added an instance of UefiDevicePathLib for StandaloneMm. It abstracts DevicePathFromHandle function into different files for Standalone MM and other instances to avoid linking gBS into MM_STANDALONE drivers. Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com> Signed-off-by: Kun Qin <kun.q@outlook.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/** @file
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Device Path services. The thing to remember is device paths are built out of
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nodes. The device path is terminated by an end node that is length
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sizeof(EFI_DEVICE_PATH_PROTOCOL). That would be why there is sizeof(EFI_DEVICE_PATH_PROTOCOL)
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all over this file.
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The only place where multi-instance device paths are supported is in
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environment varibles. Multi-instance device paths should never be placed
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on a Handle.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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Copyright (c) Microsoft Corporation.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "UefiDevicePathLib.h"
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/**
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Retrieves the device path protocol from a handle.
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This function returns the device path protocol from the handle specified by Handle.
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If Handle is NULL or Handle does not contain a device path protocol, then NULL
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is returned.
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@param Handle The handle from which to retrieve the device
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path protocol.
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@return The device path protocol from the handle specified by Handle.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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DevicePathFromHandle (
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IN EFI_HANDLE Handle
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)
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{
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EFI_DEVICE_PATH_PROTOCOL *DevicePath;
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EFI_STATUS Status;
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Status = gBS->HandleProtocol (
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Handle,
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&gEfiDevicePathProtocolGuid,
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(VOID *) &DevicePath
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);
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if (EFI_ERROR (Status)) {
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DevicePath = NULL;
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}
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return DevicePath;
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}
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