/** @file Provides library functions to construct and parse UEFI Device Paths. This library provides defines, macros, and functions to help create and parse EFI_DEVICE_PATH_PROTOCOL structures. The macros that help create and parse device path nodes make use of the ReadUnaligned16() and WriteUnaligned16() functions from the Base Library, so this library class has an implied dependency on the Base Library. Copyright (c) 2006 - 2008, 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. **/ #ifndef __DEVICE_PATH_LIB_H__ #define __DEVICE_PATH_LIB_H__ #include #define END_DEVICE_PATH_LENGTH (sizeof (EFI_DEVICE_PATH_PROTOCOL)) /** Macro that returns the Type field of a device path node. Returns the Type field of the device path node specified by Node. @param Node A pointer to a device path node data structure. @return The Type field of the device path node specified by Node. **/ #define DevicePathType(Node) (((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Type) /** Macro that returns the SubType field of a device path node. Returns the SubType field of the device path node specified by Node. @param Node A pointer to a device path node data structure. @return The SubType field of the device path node specified by Node. **/ #define DevicePathSubType(Node) (((EFI_DEVICE_PATH_PROTOCOL *)(Node))->SubType) /** Macro that returns the 16-bit Length field of a device path node. Returns the 16-bit Length field of the device path node specified by Node. @param Node A pointer to a device path node data structure. @return The 16-bit Length field of the device path node specified by Node. **/ #define DevicePathNodeLength(Node) ReadUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0]) /** Macro that returns a pointer to the next node in a device path. Returns a pointer to the device path node that follows the device path node specified by Node. @param Node A pointer to a device path node data structure. @return a pointer to the device path node that follows the device path node specified by Node. **/ #define NextDevicePathNode(Node) ((EFI_DEVICE_PATH_PROTOCOL *)((UINT8 *)(Node) + DevicePathNodeLength(Node))) /** Macro that determines if a device path node is an end node of a device path. This includes nodes that are the end of a device path instance and nodes that are the end of an entire device path. Determines if the device path node specified by Node is an end node of a device path. This includes nodes that are the end of a device path instance and nodes that are the end of an entire device path. If Node represents an end node of a device path, then TRUE is returned. Otherwise, FALSE is returned. @param Node A pointer to a device path node data structure. @retval TRUE The device path node specified by Node is an end node of a device path. @retval FALSE The device path node specified by Node is not an end node of a device path. **/ #define IsDevicePathEndType(Node) ((DevicePathType (Node) & 0x7f) == END_DEVICE_PATH_TYPE) /** Macro that determines if a device path node is an end node of an entire device path. Determines if a device path node specified by Node is an end node of an entire device path. If Node represents the end of an entire device path, then TRUE is returned. Otherwise, FALSE is returned. @param Node A pointer to a device path node data structure. @retval TRUE The device path node specified by Node is the end of an entire device path. @retval FALSE The device path node specified by Node is not the end of an entire device path. **/ #define IsDevicePathEnd(Node) (IsDevicePathEndType (Node) && DevicePathSubType(Node) == END_ENTIRE_DEVICE_PATH_SUBTYPE) /** Macro that determines if a device path node is an end node of a device path instance. Determines if a device path node specified by Node is an end node of a device path instance. If Node represents the end of a device path instance, then TRUE is returned. Otherwise, FALSE is returned. @param Node A pointer to a device path node data structure. @retval TRUE The device path node specified by Node is the end of a device path instance. @retval FALSE The device path node specified by Node is not the end of a device path instance. **/ #define IsDevicePathEndInstance(Node) (IsDevicePathEndType (Node) && DevicePathSubType(Node) == END_INSTANCE_DEVICE_PATH_SUBTYPE) /** Macro that sets the length, in bytes, of a device path node. Sets the length of the device path node specified by Node to the value specified by Length. Length is returned. @param Node A pointer to a device path node data structure. @param Length The length, in bytes, of the device path node. @return Length **/ #define SetDevicePathNodeLength(Node,NodeLength) WriteUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0], (UINT16)(NodeLength)) /** Macro that fills in all the fields of a device path node that is the end of an entire device path. Fills in all the fields of a device path node specified by Node so Node represents the end of an entire device path. @param Node A pointer to a device path node data structure. **/ #define SetDevicePathEndNode(Node) { \ DevicePathType (Node) = END_DEVICE_PATH_TYPE; \ DevicePathSubType (Node) = END_ENTIRE_DEVICE_PATH_SUBTYPE; \ SetDevicePathNodeLength ((Node), END_DEVICE_PATH_LENGTH); \ } /** 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. @retval 0 If DevicePath is NULL. @retval Others 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. 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 DevicePath A pointer to a device path data structure. @retval NULL If DevicePath is NULL. @retval Others 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 a copy of an end-of-device-path 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. @retval NULL If there is not enough memory for the newly allocated buffer. @retval Others A pointer to the new device path if success. Or a copy an end-of-device-path if both FirstDevicePath and SecondDevicePath are NULL. **/ 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 DevicePathNode is NULL then a copy of DevicePath is returned. If DevicePath is NULL then a copy of DevicePathNode, followed by an end-of-device path device node is returned. If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path device node 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. @retval NULL If there is not enough memory for the new device path. @retval Others A pointer to the new device path if success. A copy of DevicePathNode followed by an end-of-device-path node if both FirstDevicePath and SecondDevicePath are NULL. A copy of an end-of-device-path node if both FirstDevicePath and SecondDevicePath are NULL. **/ 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 device node. 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. 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. If FileName is NULL, then ASSERT(). If FileName is not aligned on a 16-bit boundary, 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