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Michael Kubackiandmergify[bot]
7a934d0bef
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.
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>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/** @file
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Copyright (c) 2010, 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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#include <Uefi.h>
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#pragma pack(1)
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//
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// Below data structure is used for lockbox registration in SMST
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//
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#define SMM_LOCK_BOX_SIGNATURE_32 SIGNATURE_64 ('L','O','C','K','B','_','3','2')
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#define SMM_LOCK_BOX_SIGNATURE_64 SIGNATURE_64 ('L','O','C','K','B','_','6','4')
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typedef struct {
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UINT64 Signature;
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EFI_PHYSICAL_ADDRESS LockBoxDataAddress;
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} SMM_LOCK_BOX_CONTEXT;
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//
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// Below data structure is used for lockbox management
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//
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#define SMM_LOCK_BOX_DATA_SIGNATURE SIGNATURE_64 ('L','O','C','K','B','O','X','D')
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typedef struct {
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UINT64 Signature;
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EFI_GUID Guid;
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EFI_PHYSICAL_ADDRESS Buffer;
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UINT64 Length;
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UINT64 Attributes;
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EFI_PHYSICAL_ADDRESS SmramBuffer;
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LIST_ENTRY Link;
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} SMM_LOCK_BOX_DATA;
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#pragma pack()
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/**
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Constructor for SmmLockBox library.
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This is used to set SmmLockBox context, which will be used in PEI phase in S3 boot path later.
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@retval EFI_SUCEESS
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@return Others Some error occurs.
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**/
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EFI_STATUS
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SmmLockBoxMmConstructor (
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VOID
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);
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/**
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Destructor for SmmLockBox library.
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This is used to uninstall SmmLockBoxCommunication configuration table
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if it has been installed in Constructor.
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@retval EFI_SUCEESS The destructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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SmmLockBoxMmDestructor (
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VOID
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);
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