OldMdePkg/Include/Library/DevicePathLib.h - edk2 - Git at Google

 /** @file
   Entry point to a DXE Boot Services Driver

   Copyright (c) 2006, Intel Corporation
   All rights reserved. This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
   http://opensource.org/licenses/bsd-license.php

   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

   Module Name:  DevicePathLib.h

 **/

 #ifndef __DEVICE_PATH_LIB_H__
 #define __DEVICE_PATH_LIB_H__

 /**
   Returns the size of a device path in bytes.

   This function returns the size, in bytes, of the device path data structure specified by
   DevicePath including the end of device path node.  If DevicePath is NULL, then 0 is returned.

   @param  DevicePath                 A pointer to a device path data structure.

   @return The size of a device path in bytes.

 **/
 UINTN
 EFIAPI
 GetDevicePathSize (
   IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath
   );

 /**
   Creates a new device path by appending a second device path to a first device path.

   This function allocates space for a new copy of the device path specified by DevicePath.  If
   DevicePath is NULL, then NULL is returned.  If the memory is successfully allocated, then the
   contents of DevicePath are copied to the newly allocated buffer, and a pointer to that buffer
   is returned.  Otherwise, NULL is returned.

   @param  DevicePath                 A pointer to a device path data structure.

   @return A pointer to the duplicated device path.

 **/
 EFI_DEVICE_PATH_PROTOCOL *
 EFIAPI
 DuplicateDevicePath (
   IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath
   );

 /**
   Creates a new device path by appending a second device path to a first device path.

   This function creates a new device path by appending a copy of SecondDevicePath to a copy of
   FirstDevicePath in a newly allocated buffer.  Only the end-of-device-path device node from
   SecondDevicePath is retained. The newly created device path is returned.
   If FirstDevicePath is NULL, then it is ignored, and a duplicate of SecondDevicePath is returned.
   If SecondDevicePath is NULL, then it is ignored, and a duplicate of FirstDevicePath is returned.
   If both FirstDevicePath and SecondDevicePath are NULL, then NULL is returned.
   If there is not enough memory for the newly allocated buffer, then NULL is returned.
   The memory for the new device path is allocated from EFI boot services memory. It is the
   responsibility of the caller to free the memory allocated.

   @param  FirstDevicePath            A pointer to a device path data structure.
   @param  SecondDevicePath           A pointer to a device path data structure.

   @return A pointer to the new device path.

 **/
 EFI_DEVICE_PATH_PROTOCOL *
 EFIAPI
 AppendDevicePath (
   IN CONST EFI_DEVICE_PATH_PROTOCOL  *FirstDevicePath,  OPTIONAL
   IN CONST EFI_DEVICE_PATH_PROTOCOL  *SecondDevicePath  OPTIONAL
   );

 /**
   Creates a new path by appending the device node to the device path.

   This function creates a new device path by appending a copy of the device node specified by
   DevicePathNode to a copy of the device path specified by DevicePath in an allocated buffer.
   The end-of-device-path device node is moved after the end of the appended device node.
   If DevicePath is NULL, then NULL is returned.
   If DevicePathNode is NULL, then NULL is returned.
   If there is not enough memory to allocate space for the new device path, then NULL is returned.
   The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
   free the memory allocated.

   @param  DevicePath                 A pointer to a device path data structure.
   @param  DevicePathNode             A pointer to a single device path node.

   @return A pointer to the new device path.

 **/
 EFI_DEVICE_PATH_PROTOCOL *
 EFIAPI
 AppendDevicePathNode (
   IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath,     OPTIONAL
   IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePathNode  OPTIONAL
   );

 /**
   Creates a new device path by appending the specified device path instance to the specified device
   path.

   This function creates a new device path by appending a copy of the device path instance specified
   by DevicePathInstance to a copy of the device path secified by DevicePath in a allocated buffer.
   The end-of-device-path device node is moved after the end of the appended device path instance
   and a new end-of-device-path-instance node is inserted between.
   If DevicePath is NULL, then a copy if DevicePathInstance is returned.
   If DevicePathInstance is NULL, then NULL is returned.
   If there is not enough memory to allocate space for the new device path, then NULL is returned.
   The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
   free the memory allocated.

   @param  DevicePath                 A pointer to a device path data structure.
   @param  DevicePathInstance         A pointer to a device path instance.

   @return A pointer to the new device path.

 **/
 EFI_DEVICE_PATH_PROTOCOL *
 EFIAPI
 AppendDevicePathInstance (
   IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath,        OPTIONAL
   IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePathInstance OPTIONAL
   );

 /**
   Creates a copy of the current device path instance and returns a pointer to the next device path
   instance.

   This function creates a copy of the current device path instance. It also updates DevicePath to
   point to the next device path instance in the device path (or NULL if no more) and updates Size
   to hold the size of the device path instance copy.
   If DevicePath is NULL, then NULL is returned.
   If there is not enough memory to allocate space for the new device path, then NULL is returned.
   The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
   free the memory allocated.
   If Size is NULL, then ASSERT().

   @param  DevicePath                 On input, this holds the pointer to the current device path
                                      instance. On output, this holds the pointer to the next device
                                      path instance or NULL if there are no more device path
                                      instances in the device path pointer to a device path data
                                      structure.
   @param  Size                       On output, this holds the size of the device path instance, in
                                      bytes or zero, if DevicePath is NULL.

   @return A pointer to the current device path instance.

 **/
 EFI_DEVICE_PATH_PROTOCOL *
 EFIAPI
 GetNextDevicePathInstance (
   IN OUT EFI_DEVICE_PATH_PROTOCOL    **DevicePath,
   OUT UINTN                          *Size
   );

 /**
   Creates a copy of the current device path instance and returns a pointer to the next device path
   instance.

   This function creates a new device node in a newly allocated buffer of size NodeLength and
   initializes the device path node header with NodeType and NodeSubType.  The new device path node
   is returned.
   If NodeLength is smaller than a device path header, then NULL is returned.
   If there is not enough memory to allocate space for the new device path, then NULL is returned.
   The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
   free the memory allocated.

   @param  NodeType                   The device node type for the new device node.
   @param  NodeSubType                The device node sub-type for the new device node.
   @param  NodeLength                 The length of the new device node.

   @return The new device path.

 **/
 EFI_DEVICE_PATH_PROTOCOL *
 EFIAPI
 CreateDeviceNode (
   IN UINT8                           NodeType,
   IN UINT8                           NodeSubType,
   IN UINT16                          NodeLength
   );

 /**
   Determines if a device path is single or multi-instance.

   This function returns TRUE if the device path specified by DevicePath is multi-instance.
   Otherwise, FALSE is returned.  If DevicePath is NULL, then FALSE is returned.

   @param  DevicePath                 A pointer to a device path data structure.

   @retval  TRUE                      DevicePath is multi-instance.
   @retval  FALSE                     DevicePath is not multi-instance or DevicePath is NULL.

 **/
 BOOLEAN
 EFIAPI
 IsDevicePathMultiInstance (
   IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath
   );

 /**
   Retrieves the device path protocol from a handle.

   This function returns the device path protocol from the handle specified by Handle.  If Handle is
   NULL or Handle does not contain a device path protocol, then NULL is returned.

   @param  Handle                     The handle from which to retrieve the device path protocol.

   @return The device path protocol from the handle specified by Handle.

 **/
 EFI_DEVICE_PATH_PROTOCOL *
 EFIAPI
 DevicePathFromHandle (
   IN EFI_HANDLE                      Handle
   );

 /**
   Allocates a device path for a file and appends it to an existing device path.

   If Device is a valid device handle that contains a device path protocol, then a device path for
   the file specified by FileName  is allocated and appended to the device path associated with the
   handle Device.  The allocated device path is returned.  If Device is NULL or Device is a handle
   that does not support the device path protocol, then a device path containing a single device
   path node for the file specified by FileName is allocated and returned.
   If FileName is NULL, then ASSERT().

   @param  Device                     A pointer to a device handle.  This parameter is optional and
                                      may be NULL.
   @param  FileName                   A pointer to a Null-terminated Unicode string.

   @return The allocated device path.

 **/
 EFI_DEVICE_PATH_PROTOCOL *
 EFIAPI
 FileDevicePath (
   IN EFI_HANDLE                      Device,     OPTIONAL
   IN CONST CHAR16                    *FileName
   );

 #endif
	/** @file
	Entry point to a DXE Boot Services Driver

	Copyright (c) 2006, Intel Corporation
	All rights reserved. This program and the accompanying materials
	are licensed and made available under the terms and conditions of the BSD License
	which accompanies this distribution. The full text of the license may be found at
	http://opensource.org/licenses/bsd-license.php

	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

	Module Name: DevicePathLib.h

	**/

	#ifndef __DEVICE_PATH_LIB_H__
	#define __DEVICE_PATH_LIB_H__

	/**
	Returns the size of a device path in bytes.

	This function returns the size, in bytes, of the device path data structure specified by
	DevicePath including the end of device path node. If DevicePath is NULL, then 0 is returned.

	@param DevicePath A pointer to a device path data structure.

	@return The size of a device path in bytes.

	**/
	UINTN
	EFIAPI
	GetDevicePathSize (
	IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
	);

	/**
	Creates a new device path by appending a second device path to a first device path.

	This function allocates space for a new copy of the device path specified by DevicePath. If
	DevicePath is NULL, then NULL is returned. If the memory is successfully allocated, then the
	contents of DevicePath are copied to the newly allocated buffer, and a pointer to that buffer
	is returned. Otherwise, NULL is returned.

	@param DevicePath A pointer to a device path data structure.

	@return A pointer to the duplicated device path.

	**/
	EFI_DEVICE_PATH_PROTOCOL *
	EFIAPI
	DuplicateDevicePath (
	IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
	);

	/**
	Creates a new device path by appending a second device path to a first device path.

	This function creates a new device path by appending a copy of SecondDevicePath to a copy of
	FirstDevicePath in a newly allocated buffer. Only the end-of-device-path device node from
	SecondDevicePath is retained. The newly created device path is returned.
	If FirstDevicePath is NULL, then it is ignored, and a duplicate of SecondDevicePath is returned.
	If SecondDevicePath is NULL, then it is ignored, and a duplicate of FirstDevicePath is returned.
	If both FirstDevicePath and SecondDevicePath are NULL, then NULL is returned.
	If there is not enough memory for the newly allocated buffer, then NULL is returned.
	The memory for the new device path is allocated from EFI boot services memory. It is the
	responsibility of the caller to free the memory allocated.

	@param FirstDevicePath A pointer to a device path data structure.
	@param SecondDevicePath A pointer to a device path data structure.

	@return A pointer to the new device path.

	**/
	EFI_DEVICE_PATH_PROTOCOL *
	EFIAPI
	AppendDevicePath (
	IN CONST EFI_DEVICE_PATH_PROTOCOL *FirstDevicePath, OPTIONAL
	IN CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath OPTIONAL
	);

	/**
	Creates a new path by appending the device node to the device path.

	This function creates a new device path by appending a copy of the device node specified by
	DevicePathNode to a copy of the device path specified by DevicePath in an allocated buffer.
	The end-of-device-path device node is moved after the end of the appended device node.
	If DevicePath is NULL, then NULL is returned.
	If DevicePathNode is NULL, then NULL is returned.
	If there is not enough memory to allocate space for the new device path, then NULL is returned.
	The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
	free the memory allocated.

	@param DevicePath A pointer to a device path data structure.
	@param DevicePathNode A pointer to a single device path node.

	@return A pointer to the new device path.

	**/
	EFI_DEVICE_PATH_PROTOCOL *
	EFIAPI
	AppendDevicePathNode (
	IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL
	IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode OPTIONAL
	);

	/**
	Creates a new device path by appending the specified device path instance to the specified device
	path.

	This function creates a new device path by appending a copy of the device path instance specified
	by DevicePathInstance to a copy of the device path secified by DevicePath in a allocated buffer.
	The end-of-device-path device node is moved after the end of the appended device path instance
	and a new end-of-device-path-instance node is inserted between.
	If DevicePath is NULL, then a copy if DevicePathInstance is returned.
	If DevicePathInstance is NULL, then NULL is returned.
	If there is not enough memory to allocate space for the new device path, then NULL is returned.
	The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
	free the memory allocated.

	@param DevicePath A pointer to a device path data structure.
	@param DevicePathInstance A pointer to a device path instance.

	@return A pointer to the new device path.

	**/
	EFI_DEVICE_PATH_PROTOCOL *
	EFIAPI
	AppendDevicePathInstance (
	IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL
	IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance OPTIONAL
	);

	/**
	Creates a copy of the current device path instance and returns a pointer to the next device path
	instance.

	This function creates a copy of the current device path instance. It also updates DevicePath to
	point to the next device path instance in the device path (or NULL if no more) and updates Size
	to hold the size of the device path instance copy.
	If DevicePath is NULL, then NULL is returned.
	If there is not enough memory to allocate space for the new device path, then NULL is returned.
	The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
	free the memory allocated.
	If Size is NULL, then ASSERT().

	@param DevicePath On input, this holds the pointer to the current device path
	instance. On output, this holds the pointer to the next device
	path instance or NULL if there are no more device path
	instances in the device path pointer to a device path data
	structure.
	@param Size On output, this holds the size of the device path instance, in
	bytes or zero, if DevicePath is NULL.

	@return A pointer to the current device path instance.

	**/
	EFI_DEVICE_PATH_PROTOCOL *
	EFIAPI
	GetNextDevicePathInstance (
	IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath,
	OUT UINTN *Size
	);

	/**
	Creates a copy of the current device path instance and returns a pointer to the next device path
	instance.

	This function creates a new device node in a newly allocated buffer of size NodeLength and
	initializes the device path node header with NodeType and NodeSubType. The new device path node
	is returned.
	If NodeLength is smaller than a device path header, then NULL is returned.
	If there is not enough memory to allocate space for the new device path, then NULL is returned.
	The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
	free the memory allocated.

	@param NodeType The device node type for the new device node.
	@param NodeSubType The device node sub-type for the new device node.
	@param NodeLength The length of the new device node.

	@return The new device path.

	**/
	EFI_DEVICE_PATH_PROTOCOL *
	EFIAPI
	CreateDeviceNode (
	IN UINT8 NodeType,
	IN UINT8 NodeSubType,
	IN UINT16 NodeLength
	);

	/**
	Determines if a device path is single or multi-instance.

	This function returns TRUE if the device path specified by DevicePath is multi-instance.
	Otherwise, FALSE is returned. If DevicePath is NULL, then FALSE is returned.

	@param DevicePath A pointer to a device path data structure.

	@retval TRUE DevicePath is multi-instance.
	@retval FALSE DevicePath is not multi-instance or DevicePath is NULL.

	**/
	BOOLEAN
	EFIAPI
	IsDevicePathMultiInstance (
	IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
	);

	/**
	Retrieves the device path protocol from a handle.

	This function returns the device path protocol from the handle specified by Handle. If Handle is
	NULL or Handle does not contain a device path protocol, then NULL is returned.

	@param Handle The handle from which to retrieve the device path protocol.

	@return The device path protocol from the handle specified by Handle.

	**/
	EFI_DEVICE_PATH_PROTOCOL *
	EFIAPI
	DevicePathFromHandle (
	IN EFI_HANDLE Handle
	);

	/**
	Allocates a device path for a file and appends it to an existing device path.

	If Device is a valid device handle that contains a device path protocol, then a device path for
	the file specified by FileName is allocated and appended to the device path associated with the
	handle Device. The allocated device path is returned. If Device is NULL or Device is a handle
	that does not support the device path protocol, then a device path containing a single device
	path node for the file specified by FileName is allocated and returned.
	If FileName is NULL, then ASSERT().

	@param Device A pointer to a device handle. This parameter is optional and
	may be NULL.
	@param FileName A pointer to a Null-terminated Unicode string.

	@return The allocated device path.

	**/
	EFI_DEVICE_PATH_PROTOCOL *
	EFIAPI
	FileDevicePath (
	IN EFI_HANDLE Device, OPTIONAL
	IN CONST CHAR16 *FileName
	);

	#endif