Tianocore/edk2.git/MdePkg/Include/Register/Intel/Microcode.h, branch master

MdePkg: Replace include guards with #pragma once

2026-02-23T21:01:28+00:00

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

MdePkg: Apply uncrustify changes

2021-12-07T17:24:28+00:00

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737 Apply uncrustify changes to .c/.h files in the MdePkg package Cc: Andrew Fish Cc: Leif Lindholm Cc: Michael D Kinney Signed-off-by: Michael Kubacki Reviewed-by: Liming Gao

UefiCpuPkg|MdePkg: Move Register/ folder to MdePkg/Include/

2019-08-09T00:52:09+00:00

The patch moves all files under UefiCpuPkg/Include/Register/ to MdePkg/Include/Register using following detailed approaches: 1. Move UefiCpuPkg/Include/Register/Amd/ to MdePkg/Include/Register/Amd folder. 2. Move remaining in UefiCpuPkg/Include/Register/ to MdePkg/Include/Register/Intel folder. 3. Create wrapper header files under UefiCpuPkg/Include/Register/ to include the accordingly files in MdePkg/Include/Register/Intel. This is to avoid build break because code in other repos like edk2-platform includes the file from UefiCpuPkg. The wrapper header files will be removed after all consumers code is updated. Signed-off-by: Ray Ni Reviewed-by: Eric Dong Regression-tested-by: Laszlo Ersek Reviewed-by: Liming Gao Signed-off-by: Eric Dong