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2026-02-24MdePkg: Replace include guards with #pragma onceMichael Kubacki1-4/+1
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>
2021-12-07MdePkg: Apply uncrustify changesMichael Kubacki1-5/+5
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737 Apply uncrustify changes to .c/.h files in the MdePkg package Cc: Andrew Fish <afish@apple.com> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
2021-12-07MdePkg: Change OPTIONAL keyword usage styleMichael D Kinney1-1/+1
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3760 Update all use of ', OPTIONAL' to ' OPTIONAL,' for function params. Cc: Andrew Fish <afish@apple.com> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Michael Kubacki <michael.kubacki@microsoft.com> Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
2019-04-09MdePkg: Replace BSD License with BSD+Patent LicenseMichael D Kinney1-7/+1
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
2011-08-25Add new API GetTimeInNanoSecond() to TimerLib to convert elapsed ticks to ↵xdu21-1/+18
time in unit of nanoseconds. Signed-off-by: xdu2 Reviewed-by: mdkinney git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12206 6f19259b-4bc3-4df7-8a09-765794883524
2010-04-23Update the copyright notice formathhtian1-2/+2
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10403 6f19259b-4bc3-4df7-8a09-765794883524
2008-11-26Function headers in .h and .c files synchronized with specjji41-1/+6
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6728 6f19259b-4bc3-4df7-8a09-765794883524
2008-11-14Synchronization of MDE Library Spec., Mde.dec, and corresponding head files ↵jji41-8/+8
in MdePkg\Include\Library. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6544 6f19259b-4bc3-4df7-8a09-765794883524
2008-09-25Clean up code according to code review.vanjeff1-2/+2
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5965 6f19259b-4bc3-4df7-8a09-765794883524
2008-07-22modify coding style to pass ecc tooleric_tian1-10/+4
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5543 6f19259b-4bc3-4df7-8a09-765794883524
2007-06-28Updated headers to follow coding standardAJFISH1-2/+0
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2815 6f19259b-4bc3-4df7-8a09-765794883524
2007-06-19Import Library Class from original MDE package. Also I added the ↵yshang11-0/+100
EFI_PEI_CORE_ENTRY_POINT definition in PiPeiCis.h. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2677 6f19259b-4bc3-4df7-8a09-765794883524
2007-06-01Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break ↵lhauch1-100/+0
existing builds. Also updated the SPD and FPD files UiNames git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2616 6f19259b-4bc3-4df7-8a09-765794883524
2006-09-13update GetPerformanceCounterProperties() declarevanjeff1-2/+2
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1518 6f19259b-4bc3-4df7-8a09-765794883524
2006-07-251. Updated declaration of timer functions according to latest MWG.bxing1-2/+2
2. Updated coding style. 3. Updated the algorithm used in delay functions to handle timer counter wrap-around. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1089 6f19259b-4bc3-4df7-8a09-765794883524
2006-06-26• BaseMemoryLib:qhuang81-9/+9
Modify some Aassert()s conditions to sync with MWG 0.56d Modify some defects in function header. • PostCodeLib: Implement PeiDxePostCodeLibReportStatusCode. • Misc Rename BaseDebugLibReportStatusCode to PeiDxeDebugLibReportStatusCode Remove tabs in all .c and .h files in MdePkg. Rename PeiServicesReinstallPpi() to PeiServicesReInstallPpi() Adjust some minor coding style in PeCoffLoaderGetEntryPointerLib() git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@626 6f19259b-4bc3-4df7-8a09-765794883524
2006-04-22Initial import.bbahnsen1-0/+100
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3 6f19259b-4bc3-4df7-8a09-765794883524
generated by cgit v1.2.3 (git 2.39.0) at 2026-09-28 23:41:59 +0300