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293 lines
12 KiB
C
293 lines
12 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 variables. Multi-instance device paths should never be placed
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on a Handle.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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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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Returns the size of a device path in bytes.
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This function returns the size, in bytes, of the device path data structure
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specified by DevicePath including the end of device path node.
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If DevicePath is NULL or invalid, then 0 is returned.
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@param DevicePath A pointer to a device path data structure.
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@retval 0 If DevicePath is NULL or invalid.
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@retval Others The size of a device path in bytes.
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**/
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UINTN
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GetDevicePathSize (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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return UefiDevicePathLibGetDevicePathSize (DevicePath);
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}
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/**
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Creates a new copy of an existing device path.
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This function allocates space for a new copy of the device path specified by DevicePath.
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If DevicePath is NULL, then NULL is returned. If the memory is successfully
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allocated, then the contents of DevicePath are copied to the newly allocated
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buffer, and a pointer to that buffer is returned. Otherwise, NULL is returned.
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The memory for the new device path is allocated from EFI boot services memory.
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It is the responsibility of the caller to free the memory allocated.
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@param DevicePath A pointer to a device path data structure.
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@retval NULL DevicePath is NULL or invalid.
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@retval Others A pointer to the duplicated device path.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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DuplicateDevicePath (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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return UefiDevicePathLibDuplicateDevicePath (DevicePath);
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}
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/**
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Creates a new device path by appending a second device path to a first device path.
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This function creates a new device path by appending a copy of SecondDevicePath
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to a copy of FirstDevicePath in a newly allocated buffer. Only the end-of-device-path
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device node from SecondDevicePath is retained. The newly created device path is
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returned. If FirstDevicePath is NULL, then it is ignored, and a duplicate of
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SecondDevicePath is returned. If SecondDevicePath is NULL, then it is ignored,
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and a duplicate of FirstDevicePath is returned. If both FirstDevicePath and
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SecondDevicePath are NULL, then a copy of an end-of-device-path is returned.
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If there is not enough memory for the newly allocated buffer, then NULL is returned.
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The memory for the new device path is allocated from EFI boot services memory.
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It is the responsibility of the caller to free the memory allocated.
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@param FirstDevicePath A pointer to a device path data structure.
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@param SecondDevicePath A pointer to a device path data structure.
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@retval NULL If there is not enough memory for the newly allocated buffer.
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@retval NULL If FirstDevicePath or SecondDevicePath is invalid.
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@retval Others A pointer to the new device path if success.
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Or a copy an end-of-device-path if both FirstDevicePath and SecondDevicePath are NULL.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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AppendDevicePath (
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CONST EFI_DEVICE_PATH_PROTOCOL *FirstDevicePath, OPTIONAL
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CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath OPTIONAL
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)
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{
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return UefiDevicePathLibAppendDevicePath (FirstDevicePath, SecondDevicePath);
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}
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/**
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Creates a new path by appending the device node to the device path.
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This function creates a new device path by appending a copy of the device node
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specified by DevicePathNode to a copy of the device path specified by DevicePath
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in an allocated buffer. The end-of-device-path device node is moved after the
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end of the appended device node.
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If DevicePathNode is NULL then a copy of DevicePath is returned.
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If DevicePath is NULL then a copy of DevicePathNode, followed by an end-of-device
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path device node is returned.
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If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path
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device node is returned.
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If there is not enough memory to allocate space for the new device path, then
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NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility
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of the caller to free the memory allocated.
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@param DevicePath A pointer to a device path data structure.
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@param DevicePathNode A pointer to a single device path node.
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@retval NULL If there is not enough memory for the new device path.
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@retval Others A pointer to the new device path if success.
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A copy of DevicePathNode followed by an end-of-device-path node
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if both FirstDevicePath and SecondDevicePath are NULL.
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A copy of an end-of-device-path node if both FirstDevicePath
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and SecondDevicePath are NULL.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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AppendDevicePathNode (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode OPTIONAL
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)
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{
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return UefiDevicePathLibAppendDevicePathNode (DevicePath, DevicePathNode);
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}
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/**
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Creates a new device path by appending the specified device path instance to the specified device
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path.
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This function creates a new device path by appending a copy of the device path
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instance specified by DevicePathInstance to a copy of the device path specified
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by DevicePath in a allocated buffer.
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The end-of-device-path device node is moved after the end of the appended device
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path instance and a new end-of-device-path-instance node is inserted between.
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If DevicePath is NULL, then a copy if DevicePathInstance is returned.
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If DevicePathInstance is NULL, then NULL is returned.
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If DevicePath or DevicePathInstance is invalid, then NULL is returned.
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If there is not enough memory to allocate space for the new device path, then
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NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility
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of the caller to free the memory allocated.
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@param DevicePath A pointer to a device path data structure.
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@param DevicePathInstance A pointer to a device path instance.
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@return A pointer to the new device path.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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AppendDevicePathInstance (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance OPTIONAL
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)
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{
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return UefiDevicePathLibAppendDevicePathInstance (DevicePath, DevicePathInstance);
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}
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/**
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Creates a copy of the current device path instance and returns a pointer to the next device path
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instance.
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This function creates a copy of the current device path instance. It also updates
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DevicePath to point to the next device path instance in the device path (or NULL
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if no more) and updates Size to hold the size of the device path instance copy.
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If DevicePath is NULL, then NULL is returned.
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If DevicePath points to a invalid device path, then NULL is returned.
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If there is not enough memory to allocate space for the new device path, then
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NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility
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of the caller to free the memory allocated.
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If Size is NULL, then ASSERT().
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@param DevicePath On input, this holds the pointer to the current
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device path instance. On output, this holds
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the pointer to the next device path instance
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or NULL if there are no more device path
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instances in the device path pointer to a
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device path data structure.
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@param Size On output, this holds the size of the device
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path instance, in bytes or zero, if DevicePath
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is NULL.
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@return A pointer to the current device path instance.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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GetNextDevicePathInstance (
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EFI_DEVICE_PATH_PROTOCOL **DevicePath,
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UINTN *Size
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)
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{
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return UefiDevicePathLibGetNextDevicePathInstance (DevicePath, Size);
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}
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/**
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Creates a device node.
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This function creates a new device node in a newly allocated buffer of size
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NodeLength and initializes the device path node header with NodeType and NodeSubType.
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The new device path node is returned.
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If NodeLength is smaller than a device path header, then NULL is returned.
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If there is not enough memory to allocate space for the new device path, then
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NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility
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of the caller to free the memory allocated.
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@param NodeType The device node type for the new device node.
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@param NodeSubType The device node sub-type for the new device node.
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@param NodeLength The length of the new device node.
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@return The new device path.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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CreateDeviceNode (
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UINT8 NodeType,
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UINT8 NodeSubType,
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UINT16 NodeLength
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)
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{
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return UefiDevicePathLibCreateDeviceNode (NodeType, NodeSubType, NodeLength);
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}
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/**
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Determines if a device path is single or multi-instance.
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This function returns TRUE if the device path specified by DevicePath is
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multi-instance.
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Otherwise, FALSE is returned.
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If DevicePath is NULL or invalid, then FALSE is returned.
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@param DevicePath A pointer to a device path data structure.
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@retval TRUE DevicePath is multi-instance.
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@retval FALSE DevicePath is not multi-instance, or DevicePath
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is NULL or invalid.
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**/
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BOOLEAN
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IsDevicePathMultiInstance (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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return UefiDevicePathLibIsDevicePathMultiInstance (DevicePath);
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}
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/**
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Convert text to the binary representation of a device node.
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@param TextDeviceNode TextDeviceNode points to the text representation of a device
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node. Conversion starts with the first character and continues
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until the first non-device node character.
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@return A pointer to the EFI device node or NULL if TextDeviceNode is NULL or there was
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insufficient memory or text unsupported.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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ConvertTextToDeviceNode (
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CONST CHAR16 *TextDeviceNode
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)
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{
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return UefiDevicePathLibConvertTextToDeviceNode (TextDeviceNode);
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}
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/**
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Convert text to the binary representation of a device path.
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@param TextDevicePath TextDevicePath points to the text representation of a device
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path. Conversion starts with the first character and continues
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until the first non-device node character.
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@return A pointer to the allocated device path or NULL if TextDeviceNode is NULL or
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there was insufficient memory.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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ConvertTextToDevicePath (
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CONST CHAR16 *TextDevicePath
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)
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{
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return UefiDevicePathLibConvertTextToDevicePath (TextDevicePath);
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}
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