Tianocore/edk2.git/MdePkg/Library/BaseMemoryLib/MemLibGeneric.c, branch master

MdePkg: BaseMemoryLib: Add memory barrier to SetMem

2026-07-18T15:04:29+00:00

The implementation adds a toolchain-specific compiler barriers to discourage reordering under aggressive optimization around memory setting operations. Signed-off-by: Kun Qin

MdePkg/BaseMemoryLib: Prevent potential VS2022 linker failure

2025-02-28T16:14:37+00:00

After updating between various VS2022 versions such as 17.4 to 17.5, , linker failures began to appear in several modules because `memset` is an unresolved symbol. The following functions in BaseMemoryLib/MemLibGeneric.c have their loop pattern replaced with the `memset` intrinsic function: - `InternalMemSetMem16()` - `InternalMemSetMem32()` - `InternalMemSetMem64()` An example of an error related to `InternalMemSetMem64()` in VariableSmmRuntimeDxe is shown below: ``` INFO - BaseMemoryLib.lib(MemLibGeneric.obj) : error LNK2001: unresolved external symbol memset INFO - <...>\VariableSmmRuntimeDxe.dll : fatal error LNK1120: 1 unresolved externals ``` This was reproduced in several environments including: - Public VM image: https://github.com/actions/runner-images/blob/win22/20230226.1/images/win/Windows2022-Readme.md - Locally when updating from 17.4.4 to 17.5.1 > Note: This image (with 17.4) does not have this issue https://github.com/actions/runner-images/blob/win22/20230219.1/images/win/Windows2022-Readme.md This change updates the type cast for the destination buffer to be a pointer to `volatile` data to prevent this optimization with a relatively minimum delta to prior implementation. 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

MdePkg: Replace BSD License with BSD+Patent License

2019-04-09T17:58:13+00:00

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 Reviewed-by: Liming Gao

MdePkg/MemoryLib: Refine InternalMemSetMem16|32|64 functions logic

2016-12-22T08:17:16+00:00

This commit refines the logic for InternalMemSetMem16|32|64 functions. It avoids using the decrement operator '--' for array index to prevent possible mis-reports by static code checkers. Please note that those modified functions are only consumed within MemoryLib by APIs SetMem16|32|64, and those APIs will handle the case when the input number of bytes to set is 0. Hence, the behavior of APIs SetMem16|32|64 is not changed. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu Reviewed-by: Michael Kinney

MdePkg BaseMemoryLib: Add C implementation of API IsZeroBuffer()

2016-08-22T10:54:30+00:00

Add the implementation of API IsZeroBuffer() via C language for the following library instances: BaseMemoryLib PeiMemoryLib UefiMemoryLib Cc: Michael D Kinney Cc: Liming Gao Cc: Jiewen Yao Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu Reviewed-by: Liming Gao

Fix InternalMemScanMem* functions so that they return the pointer to the matched object, as specified, instead of the following object.

2011-01-07T23:00:16+00:00

Replaces the fix instituted in rev. 10821 with a more understandable, sustainable, and efficient fix that behaves the same regardless of compiler. Reviewed by two peers. Fixes HSD tracker 204556. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11237 6f19259b-4bc3-4df7-8a09-765794883524

Fix the InternalMemScanMem* functions. They were returning the character AFTER the match instead of the matching character.

2010-08-25T23:06:43+00:00

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10821 6f19259b-4bc3-4df7-8a09-765794883524

Minor grammatical work--mostly adding periods. Items with ONLY period added did not have the heading date changed, but Items with content changes had heading copyright dates updated. Sending separately a list of files missing Doxygen @param and @return information. (PENDING)

2010-06-25T21:56:02+00:00

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10604 6f19259b-4bc3-4df7-8a09-765794883524

Minor grammatical work--mostly adding periods. Items with ONLY period added did not have the heading date changed, but Items with content changes had heading copyright dates updated. Sending separately a list of files missing Doxygen @param and @return information. (PENDING)

2010-06-24T20:11:34+00:00

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10597 6f19259b-4bc3-4df7-8a09-765794883524