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/** @file
EFI_DEVICE_PATH_UTILITIES_PROTOCOL as defined in UEFI 2.0.
Use to create and manipulate device paths and device nodes.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __DEVICE_PATH_UTILITIES_PROTOCOL_H__
#define __DEVICE_PATH_UTILITIES_PROTOCOL_H__
///
/// Device Path Utilities protocol
///
#define EFI_DEVICE_PATH_UTILITIES_PROTOCOL_GUID \
{ \
0x379be4e, 0xd706, 0x437d, {0xb0, 0x37, 0xed, 0xb8, 0x2f, 0xb7, 0x72, 0xa4 } \
}
/**
Returns the size of the device path, in bytes.
@param DevicePath Points to the start of the EFI device path.
@return Size Size of the specified device path, in bytes, including the end-of-path tag.
@retval 0 DevicePath is NULL
**/
typedef
UINTN
(EFIAPI *EFI_DEVICE_PATH_UTILS_GET_DEVICE_PATH_SIZE)(
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
);
/**
Create a duplicate of the specified path.
@param DevicePath Points to the source EFI device path.
@retval Pointer A pointer to the duplicate device path.
@retval NULL insufficient memory or DevicePath is NULL
**/
typedef
EFI_DEVICE_PATH_PROTOCOL *
(EFIAPI *EFI_DEVICE_PATH_UTILS_DUP_DEVICE_PATH)(
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
);
/**
Create a new path by appending the second device path to the first.
If Src1 is NULL and Src2 is non-NULL, then a duplicate of Src2 is returned.
If Src1 is non-NULL and Src2 is NULL, then a duplicate of Src1 is returned.
If Src1 and Src2 are both NULL, then a copy of an end-of-device-path is returned.
@param Src1 Points to the first device path.
@param Src2 Points to the second device path.
@retval Pointer A pointer to the newly created device path.
@retval NULL Memory could not be allocated
**/
typedef
EFI_DEVICE_PATH_PROTOCOL *
(EFIAPI *EFI_DEVICE_PATH_UTILS_APPEND_PATH)(
IN CONST EFI_DEVICE_PATH_PROTOCOL *Src1,
IN CONST EFI_DEVICE_PATH_PROTOCOL *Src2
);
/**
Creates a new path by appending the device node to the device path.
If DeviceNode is NULL then a copy of DevicePath is returned.
If DevicePath is NULL then a copy of DeviceNode, followed by an end-of-device path device node is returned.
If both DeviceNode and DevicePath are NULL then a copy of an end-of-device-path device node is returned.
@param DevicePath Points to the device path.
@param DeviceNode Points to the device node.
@retval Pointer A pointer to the allocated device node.
@retval NULL There was insufficient memory.
**/
typedef
EFI_DEVICE_PATH_PROTOCOL *
(EFIAPI *EFI_DEVICE_PATH_UTILS_APPEND_NODE)(
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
IN CONST EFI_DEVICE_PATH_PROTOCOL *DeviceNode
);
/**
Creates a new path by appending the specified device path instance to the specified device path.
@param DevicePath Points to the device path. If NULL, then ignored.
@param DevicePathInstance Points to the device path instance.
@retval Pointer A pointer to the newly created device path
@retval NULL Memory could not be allocated or DevicePathInstance is NULL.
**/
typedef
EFI_DEVICE_PATH_PROTOCOL *
(EFIAPI *EFI_DEVICE_PATH_UTILS_APPEND_INSTANCE)(
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance
);
/**
Creates a copy of the current device path instance and returns a pointer to the next device path
instance.
@param DevicePathInstance 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.
@param DevicePathInstanceSize On output, this holds the size of the device path instance,
in bytes or zero, if DevicePathInstance is NULL.
If NULL, then the instance size is not output.
@retval Pointer A pointer to the copy of the current device path instance.
@retval NULL DevicePathInstace was NULL on entry or there was insufficient memory.
**/
typedef
EFI_DEVICE_PATH_PROTOCOL *
(EFIAPI *EFI_DEVICE_PATH_UTILS_GET_NEXT_INSTANCE)(
IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePathInstance,
OUT UINTN *DevicePathInstanceSize
);
/**
Creates a device node
@param NodeType NodeType is the device node type (EFI_DEVICE_PATH.Type) for
the new device node.
@param NodeSubType NodeSubType is the device node sub-type
EFI_DEVICE_PATH.SubType) for the new device node.
@param NodeLength NodeLength is the length of the device node
(EFI_DEVICE_PATH.Length) for the new device node.
@retval Pointer A pointer to the newly created device node.
@retval NULL NodeLength is less than
the size of the header or there was insufficient memory.
**/
typedef
EFI_DEVICE_PATH_PROTOCOL *
(EFIAPI *EFI_DEVICE_PATH_UTILS_CREATE_NODE)(
IN UINT8 NodeType,
IN UINT8 NodeSubType,
IN UINT16 NodeLength
);
/**
Returns whether a device path is multi-instance.
@param DevicePath Points to the device path. If NULL, then ignored.
@retval TRUE The device path has more than one instance
@retval FALSE The device path is empty or contains only a single instance.
**/
typedef
BOOLEAN
(EFIAPI *EFI_DEVICE_PATH_UTILS_IS_MULTI_INSTANCE)(
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
);
///
/// This protocol is used to creates and manipulates device paths and device nodes.
///
typedef struct {
EFI_DEVICE_PATH_UTILS_GET_DEVICE_PATH_SIZE GetDevicePathSize;
EFI_DEVICE_PATH_UTILS_DUP_DEVICE_PATH DuplicateDevicePath;
EFI_DEVICE_PATH_UTILS_APPEND_PATH AppendDevicePath;
EFI_DEVICE_PATH_UTILS_APPEND_NODE AppendDeviceNode;
EFI_DEVICE_PATH_UTILS_APPEND_INSTANCE AppendDevicePathInstance;
EFI_DEVICE_PATH_UTILS_GET_NEXT_INSTANCE GetNextDevicePathInstance;
EFI_DEVICE_PATH_UTILS_IS_MULTI_INSTANCE IsDevicePathMultiInstance;
EFI_DEVICE_PATH_UTILS_CREATE_NODE CreateDeviceNode;
} EFI_DEVICE_PATH_UTILITIES_PROTOCOL;
extern EFI_GUID gEfiDevicePathUtilitiesProtocolGuid;
#endif
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