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0e6d10de1c
Replace traditional `#ifndef`/`#define`/`#endif` include guards with
`#pragma` once.
`#pragma once` is a widely supported preprocessor directive that
prevents header files from being included multiple times. It is
supported by all toolchains used to build edk2: GCC, Clang/LLVM, and
MSVC.
Note: Some files in BaseTools are excluded from the change if they
are autogenerated or direcly related to a header from a subproject,
etc. In particular, headers in these directories were ignored:
- BaseTools/Source/C/LzmaCompress/Sdk/
- BaseTools/Source/C/VfrCompile/Pccts/
Compared to macro-based include guards, `#pragma once`:
- Eliminates the risk of macro name collisions or copy/paste errors
where two headers inadvertently use the same guard macro.
- Eliminate inconsistency in the way include guard macros are named
(e.g., some files use `__FILE_H__`, others use `FILE_H_`, etc.).
- Reduces boilerplate (three lines replaced by one).
- Avoids polluting the macro namespace with guard symbols.
- Can improve build times as the preprocessor can skip re-opening the
file entirely, rather than re-reading it to find the matching
`#endif` ("multiple-include optimization").
- Note that some compilers may already optimize traditional include
guards, by recognzining the idiomatic pattern.
This change is made acknowledging that overall portability of the
code will technically be reduced, as `#pragma once` is not part of the
C/C++ standards.
However, this is considered acceptable given:
1. edk2 already defines a subset of supported compilers in
BaseTools/Conf/tools_def.template, all of which have supported
`#pragma once` for over two decades.
2. There have been concerns raised to the project about inconsistent
include guard naming and potential macro collisions.
Approximate compiler support dates:
- MSVC: Supported since Visual C++ 4.2 (1996)
- GCC: Supported since 3.4 (2004)
(http://gnu.ist.utl.pt/software/gcc/gcc-3.4/changes.html)
- Clang (LLVM based): Since initial release in 2007
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
285 lines
8.3 KiB
C
285 lines
8.3 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) 2017, 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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#pragma once
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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_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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( *EFI_DEVICE_PATH_UTILS_GET_DEVICE_PATH_SIZE)(
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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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( *EFI_DEVICE_PATH_UTILS_DUP_DEVICE_PATH)(
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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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( *EFI_DEVICE_PATH_UTILS_APPEND_PATH)(
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CONST EFI_DEVICE_PATH_PROTOCOL *Src1,
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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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( *EFI_DEVICE_PATH_UTILS_APPEND_NODE)(
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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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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( *EFI_DEVICE_PATH_UTILS_APPEND_INSTANCE)(
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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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 DevicePathInstance 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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( *EFI_DEVICE_PATH_UTILS_GET_NEXT_INSTANCE)(
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EFI_DEVICE_PATH_PROTOCOL **DevicePathInstance,
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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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( *EFI_DEVICE_PATH_UTILS_CREATE_NODE)(
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UINT8 NodeType,
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UINT8 NodeSubType,
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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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( *EFI_DEVICE_PATH_UTILS_IS_MULTI_INSTANCE)(
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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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VOID
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SetDevicePathEndNode (
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VOID *Node
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);
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BOOLEAN
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IsDevicePathValid (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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UINTN MaxSize
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);
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UINT8
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DevicePathType (
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CONST VOID *Node
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);
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UINT8
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DevicePathSubType (
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CONST VOID *Node
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);
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UINTN
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DevicePathNodeLength (
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CONST VOID *Node
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);
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EFI_DEVICE_PATH_PROTOCOL *
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NextDevicePathNode (
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CONST VOID *Node
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);
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BOOLEAN
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IsDevicePathEndType (
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CONST VOID *Node
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);
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BOOLEAN
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IsDevicePathEnd (
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CONST VOID *Node
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);
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BOOLEAN
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IsDevicePathEndInstance (
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CONST VOID *Node
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);
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UINT16
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SetDevicePathNodeLength (
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VOID *Node,
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UINTN Length
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);
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VOID
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SetDevicePathEndNode (
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VOID *Node
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);
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UINTN
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UefiDevicePathLibGetDevicePathSize (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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);
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EFI_DEVICE_PATH_PROTOCOL *
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UefiDevicePathLibDuplicateDevicePath (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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);
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EFI_DEVICE_PATH_PROTOCOL *
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UefiDevicePathLibAppendDevicePath (
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CONST EFI_DEVICE_PATH_PROTOCOL *FirstDevicePath,
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CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath
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);
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EFI_DEVICE_PATH_PROTOCOL *
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UefiDevicePathLibAppendDevicePathNode (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode
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);
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EFI_DEVICE_PATH_PROTOCOL *
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UefiDevicePathLibAppendDevicePathInstance (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance
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);
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EFI_DEVICE_PATH_PROTOCOL *
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UefiDevicePathLibGetNextDevicePathInstance (
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EFI_DEVICE_PATH_PROTOCOL **DevicePath,
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UINTN *Size
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);
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EFI_DEVICE_PATH_PROTOCOL *
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UefiDevicePathLibCreateDeviceNode (
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UINT8 NodeType,
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UINT8 NodeSubType,
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UINT16 NodeLength
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);
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BOOLEAN
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UefiDevicePathLibIsDevicePathMultiInstance (
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CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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);
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