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