mirror of https://github.com/acidanthera/audk.git
567 lines
21 KiB
C
567 lines
21 KiB
C
/** @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.
|
|
|
|
Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
|
|
This program and the accompanying materials are licensed and made available under
|
|
the terms and conditions of the BSD License that 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__
|
|
|
|
#define END_DEVICE_PATH_LENGTH (sizeof (EFI_DEVICE_PATH_PROTOCOL))
|
|
|
|
/**
|
|
Determine whether a given device path is valid.
|
|
If DevicePath is NULL, then ASSERT().
|
|
|
|
@param DevicePath A pointer to a device path data structure.
|
|
@param MaxSize The maximum size of the device path data structure.
|
|
|
|
@retval TRUE DevicePath is valid.
|
|
@retval FALSE The length of any node node in the DevicePath is less
|
|
than sizeof (EFI_DEVICE_PATH_PROTOCOL).
|
|
@retval FALSE If MaxSize is not zero, the size of the DevicePath
|
|
exceeds MaxSize.
|
|
@retval FALSE If PcdMaximumDevicePathNodeCount is not zero, the node
|
|
count of the DevicePath exceeds PcdMaximumDevicePathNodeCount.
|
|
**/
|
|
BOOLEAN
|
|
EFIAPI
|
|
IsDevicePathValid (
|
|
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
|
|
IN UINTN MaxSize
|
|
);
|
|
|
|
/**
|
|
Returns the Type field of a device path node.
|
|
|
|
Returns the Type field of the device path node specified by Node.
|
|
|
|
If Node is NULL, then ASSERT().
|
|
|
|
@param Node A pointer to a device path node data structure.
|
|
|
|
@return The Type field of the device path node specified by Node.
|
|
|
|
**/
|
|
UINT8
|
|
EFIAPI
|
|
DevicePathType (
|
|
IN CONST VOID *Node
|
|
);
|
|
|
|
/**
|
|
Returns the SubType field of a device path node.
|
|
|
|
Returns the SubType field of the device path node specified by Node.
|
|
|
|
If Node is NULL, then ASSERT().
|
|
|
|
@param Node A pointer to a device path node data structure.
|
|
|
|
@return The SubType field of the device path node specified by Node.
|
|
|
|
**/
|
|
UINT8
|
|
EFIAPI
|
|
DevicePathSubType (
|
|
IN CONST VOID *Node
|
|
);
|
|
|
|
/**
|
|
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.
|
|
Node is not required to be aligned on a 16-bit boundary, so it is recommended
|
|
that a function such as ReadUnaligned16() be used to extract the contents of
|
|
the Length field.
|
|
|
|
If Node is NULL, then ASSERT().
|
|
|
|
@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.
|
|
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
DevicePathNodeLength (
|
|
IN CONST VOID *Node
|
|
);
|
|
|
|
/**
|
|
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.
|
|
|
|
If Node is NULL, then ASSERT().
|
|
|
|
@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.
|
|
|
|
**/
|
|
EFI_DEVICE_PATH_PROTOCOL *
|
|
EFIAPI
|
|
NextDevicePathNode (
|
|
IN CONST VOID *Node
|
|
);
|
|
|
|
/**
|
|
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.
|
|
|
|
If Node is NULL, then ASSERT().
|
|
|
|
@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.
|
|
|
|
**/
|
|
BOOLEAN
|
|
EFIAPI
|
|
IsDevicePathEndType (
|
|
IN CONST VOID *Node
|
|
);
|
|
|
|
/**
|
|
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.
|
|
|
|
If Node is NULL, then ASSERT().
|
|
|
|
@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.
|
|
|
|
**/
|
|
BOOLEAN
|
|
EFIAPI
|
|
IsDevicePathEnd (
|
|
IN CONST VOID *Node
|
|
);
|
|
|
|
/**
|
|
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.
|
|
|
|
If Node is NULL, then ASSERT().
|
|
|
|
@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.
|
|
|
|
**/
|
|
BOOLEAN
|
|
EFIAPI
|
|
IsDevicePathEndInstance (
|
|
IN CONST VOID *Node
|
|
);
|
|
|
|
/**
|
|
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 NodeLength. NodeLength is returned. Node is not required to be aligned on
|
|
a 16-bit boundary, so it is recommended that a function such as WriteUnaligned16()
|
|
be used to set the contents of the Length field.
|
|
|
|
If Node is NULL, then ASSERT().
|
|
If NodeLength >= 0x10000, then ASSERT().
|
|
If NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL), then ASSERT().
|
|
|
|
@param Node A pointer to a device path node data structure.
|
|
@param Length The length, in bytes, of the device path node.
|
|
|
|
@return Length
|
|
|
|
**/
|
|
UINT16
|
|
EFIAPI
|
|
SetDevicePathNodeLength (
|
|
IN OUT VOID *Node,
|
|
IN UINTN Length
|
|
);
|
|
|
|
/**
|
|
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. The Type field of Node is set to
|
|
END_DEVICE_PATH_TYPE, the SubType field of Node is set to
|
|
END_ENTIRE_DEVICE_PATH_SUBTYPE, and the Length field of Node is set to
|
|
END_DEVICE_PATH_LENGTH. Node is not required to be aligned on a 16-bit boundary,
|
|
so it is recommended that a function such as WriteUnaligned16() be used to set
|
|
the contents of the Length field.
|
|
|
|
If Node is NULL, then ASSERT().
|
|
|
|
@param Node A pointer to a device path node data structure.
|
|
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
SetDevicePathEndNode (
|
|
OUT VOID *Node
|
|
);
|
|
|
|
/**
|
|
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 or invalid, then 0 is returned.
|
|
|
|
@param DevicePath A pointer to a device path data structure.
|
|
|
|
@retval 0 If DevicePath is NULL or invalid.
|
|
@retval Others The size of a device path in bytes.
|
|
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
GetDevicePathSize (
|
|
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
|
|
);
|
|
|
|
/**
|
|
Creates a new copy of an existing 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 DevicePath is NULL or invalid.
|
|
@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 NULL If FirstDevicePath or SecondDevicePath is invalid.
|
|
@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 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 DevicePath or DevicePathInstance is invalid, 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 DevicePath points to a invalid device path, 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 or invalid, 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 or invalid.
|
|
|
|
**/
|
|
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
|
|
);
|
|
|
|
/**
|
|
Converts a device path to its text representation.
|
|
|
|
@param DevicePath A Pointer to the device to be converted.
|
|
@param DisplayOnly If DisplayOnly is TRUE, then the shorter text representation
|
|
of the display node is used, where applicable. If DisplayOnly
|
|
is FALSE, then the longer text representation of the display node
|
|
is used.
|
|
@param AllowShortcuts If AllowShortcuts is TRUE, then the shortcut forms of text
|
|
representation for a device node can be used, where applicable.
|
|
|
|
@return A pointer to the allocated text representation of the device path or
|
|
NULL if DeviceNode is NULL or there was insufficient memory.
|
|
|
|
**/
|
|
CHAR16 *
|
|
EFIAPI
|
|
ConvertDevicePathToText (
|
|
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
|
|
IN BOOLEAN DisplayOnly,
|
|
IN BOOLEAN AllowShortcuts
|
|
);
|
|
|
|
/**
|
|
Converts a device node to its string representation.
|
|
|
|
@param DeviceNode A Pointer to the device node to be converted.
|
|
@param DisplayOnly If DisplayOnly is TRUE, then the shorter text representation
|
|
of the display node is used, where applicable. If DisplayOnly
|
|
is FALSE, then the longer text representation of the display node
|
|
is used.
|
|
@param AllowShortcuts If AllowShortcuts is TRUE, then the shortcut forms of text
|
|
representation for a device node can be used, where applicable.
|
|
|
|
@return A pointer to the allocated text representation of the device node or NULL if DeviceNode
|
|
is NULL or there was insufficient memory.
|
|
|
|
**/
|
|
CHAR16 *
|
|
EFIAPI
|
|
ConvertDeviceNodeToText (
|
|
IN CONST EFI_DEVICE_PATH_PROTOCOL *DeviceNode,
|
|
IN BOOLEAN DisplayOnly,
|
|
IN BOOLEAN AllowShortcuts
|
|
);
|
|
|
|
/**
|
|
Convert text to the binary representation of a device node.
|
|
|
|
@param TextDeviceNode TextDeviceNode points to the text representation of a device
|
|
node. Conversion starts with the first character and continues
|
|
until the first non-device node character.
|
|
|
|
@return A pointer to the EFI device node or NULL if TextDeviceNode is NULL or there was
|
|
insufficient memory or text unsupported.
|
|
|
|
**/
|
|
EFI_DEVICE_PATH_PROTOCOL *
|
|
EFIAPI
|
|
ConvertTextToDeviceNode (
|
|
IN CONST CHAR16 *TextDeviceNode
|
|
);
|
|
|
|
/**
|
|
Convert text to the binary representation of a device path.
|
|
|
|
@param TextDevicePath TextDevicePath points to the text representation of a device
|
|
path. Conversion starts with the first character and continues
|
|
until the first non-device node character.
|
|
|
|
@return A pointer to the allocated device path or NULL if TextDeviceNode is NULL or
|
|
there was insufficient memory.
|
|
|
|
**/
|
|
EFI_DEVICE_PATH_PROTOCOL *
|
|
EFIAPI
|
|
ConvertTextToDevicePath (
|
|
IN CONST CHAR16 *TextDevicePath
|
|
);
|
|
|
|
#endif
|