MdePkg: UefiDevicePathLib: Support UefiDevicePathLib under StandaloneMm

[mirror_edk2.git] / MdePkg / Library / UefiDevicePathLib / DevicePathUtilitiesStandaloneMm.c

diff --git a/MdePkg/Library/UefiDevicePathLib/DevicePathUtilitiesStandaloneMm.c b/MdePkg/Library/UefiDevicePathLib/DevicePathUtilitiesStandaloneMm.c
new file mode 100644 (file)
index 0000000..930e778
--- /dev/null
+++ b/MdePkg/Library/UefiDevicePathLib/DevicePathUtilitiesStandaloneMm.c
@@ -0,0 +1,40 @@
+/** @file\r
+  Device Path services. The thing to remember is device paths are built out of\r
+  nodes. The device path is terminated by an end node that is length\r
+  sizeof(EFI_DEVICE_PATH_PROTOCOL). That would be why there is sizeof(EFI_DEVICE_PATH_PROTOCOL)\r
+  all over this file.\r
+\r
+  The only place where multi-instance device paths are supported is in\r
+  environment varibles. Multi-instance device paths should never be placed\r
+  on a Handle.\r
+\r
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
+  Copyright (c) Microsoft Corporation.\r
+  SPDX-License-Identifier: BSD-2-Clause-Patent\r
+\r
+**/\r
+\r
+#include "UefiDevicePathLib.h"\r
+\r
+\r
+/**\r
+  Retrieves the device path protocol from a handle.\r
+\r
+  This function returns the device path protocol from the handle specified by Handle.\r
+  If Handle is NULL or Handle does not contain a device path protocol, then NULL\r
+  is returned.\r
+\r
+  @param  Handle                     The handle from which to retrieve the device\r
+                                     path protocol.\r
+\r
+  @return The device path protocol from the handle specified by Handle.\r
+\r
+**/\r
+EFI_DEVICE_PATH_PROTOCOL *\r
+EFIAPI\r
+DevicePathFromHandle (\r
+  IN EFI_HANDLE                      Handle\r
+  )\r
+{\r
+  return NULL;\r
+}\r