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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>
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/** @file
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OEM hook status code library. Platform can implement an instance to
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initialize the OEM devices to report status code information.
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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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#pragma once
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/**
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Initialize OEM status code device.
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@return Status of initialization of OEM status code device.
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**/
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EFI_STATUS
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EFIAPI
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OemHookStatusCodeInitialize (
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VOID
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);
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/**
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Report status code to OEM device.
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@param CodeType Indicates the type of status code being reported.
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@param Value Describes the current status of a hardware or software entity.
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This includes both an operation and classification information
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about the class and subclass.
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For progress codes, the operation is the current activity.
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For error codes, it is the exception. For debug codes,
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it is not defined at this time.
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Specific values are discussed in the Intel Platform Innovation
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Framework for EFI Status Code Specification.
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@param Instance The enumeration of a hardware or software entity within the system.
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A system may contain multiple entities that match a class/subclass
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pairing.
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The instance differentiates between them. An instance of 0
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indicates that instance information is unavailable,
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not meaningful, or not relevant. Valid instance numbers
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start with 1.
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@param CallerId This optional parameter may be used to identify the caller.
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This parameter allows the status code driver to apply
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different rules to different callers.
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Type EFI_GUID is defined in InstallProtocolInterface()
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in the UEFI 2.0 Specification.
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@param Data This optional parameter may be used to pass additional data.
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@return The function always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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OemHookStatusCodeReport (
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IN EFI_STATUS_CODE_TYPE CodeType,
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IN EFI_STATUS_CODE_VALUE Value,
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IN UINT32 Instance,
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IN EFI_GUID *CallerId OPTIONAL,
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IN EFI_STATUS_CODE_DATA *Data OPTIONAL
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);
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