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2023-06-21MdePkg: Code optimization to SMM InternalAllocateAlignedPagesduntan1-1/+1
This commit is code optimization to InternalAllocateAlignedPages of SmmMemoryAllocationLib which can reduce free memory fragments. Also it can reduce one pre-allocation page. Let's take a simple example: The expected pages size is 8KB, Alignment value is 8KB. In original InternalAllocateAlignedPages(), the first step is to allocate 4 pages and then find the first 8KB-aligned address in allocated 4 pages. If the upper limit address of allocated 4 pages is already 8KB aligned, then the allocated 4 pages contains two 8KB-aligned 8KB ranges. The lower 2 pages will be selected and removed from free pages. Then the higher 2 pages will be free. Since the whole memory allocation is from high address to low address, then the higher 2 pages cann't be merged with other free pages, causing the free memory fragments. However, when only allocate 3(2+2-1) pages, we can avoid the free memory fragments in specific case. Also 3 pages must contain a 8KB-aligned 8KB range, which meets the requirement. If the upper limit address of allocated 3 pages is 8KB-aligned, then the higher 2 pages range of allocated 3 pages is 8KB-aligned and will be selected and removed from free pages. The remaining lower one page of allocated 3 pages will be free and merged with left lower free memory. This can reduce free memory fragments in smm. Signed-off-by: Dun Tan <dun.tan@intel.com> Cc: Ray Ni <ray.ni@intel.com> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com>
2021-12-07MdePkg: Apply uncrustify changesMichael Kubacki1-23/+37
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>
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>
2018-06-28MdePkg: Clean up source filesLiming Gao1-155/+155
1. Do not use tab characters 2. No trailing white space in one line 3. All files must end with CRLF Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Liming Gao <liming.gao@intel.com>
2017-03-06MdePkg: Refine casting expression result to bigger sizeHao Wu1-2/+2
There are cases that the operands of an expression are all with rank less than UINT64/INT64 and the result of the expression is explicitly cast to UINT64/INT64 to fit the target size. An example will be: UINT32 a,b; // a and b can be any unsigned int type with rank less than UINT64, like // UINT8, UINT16, etc. UINT64 c; c = (UINT64) (a + b); Some static code checkers may warn that the expression result might overflow within the rank of "int" (integer promotions) and the result is then cast to a bigger size. The commit refines codes by the following rules: 1). When the expression is possible to overflow the range of unsigned int/ int: c = (UINT64)a + b; 2). When the expression will not overflow within the rank of "int", remove the explicit type casts: c = a + b; 3). When the expression will be cast to pointer of possible greater size: UINT32 a,b; VOID *c; c = (VOID *)(UINTN)(a + b); --> c = (VOID *)((UINTN)a + b); 4). When one side of a comparison expression contains only operands with rank less than UINT32: UINT8 a; UINT16 b; UINTN c; if ((UINTN)(a + b) > c) {...} --> if (((UINT32)a + b) > c) {...} For rule 4), if we remove the 'UINTN' type cast like: if (a + b > c) {...} The VS compiler will complain with warning C4018 (signed/unsigned mismatch, level 3 warning) due to promoting 'a + b' to type 'int'. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2016-10-21MdePkg: Fix typos in commentsGary Lin1-1/+1
- Resuts -> Results - outputed -> outputted - specifiecd -> specified - TURE -> TRUE - specifed -> specified - Pointion -> Position - Arrary -> Array - elasped -> elapsed - paramter -> parameter - Sumbit -> Submit Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <liming.gao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Gary Lin <glin@suse.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
2015-06-19MdePkg: Enhance the comments for SmmMemoryAllocationLib instance.Qiu Shumin1-18/+19
Per PI spec all allocation of SMRAM should use EfiRuntimeServicesCode or EfiRuntimeServicesData. So SMM instance use EfiRuntimeServicesCode as the default memory allocation type instead of EfiBootServicesData. This patch clarify this usage in comments. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Qiu Shumin <shumin.qiu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17666 6f19259b-4bc3-4df7-8a09-765794883524
2015-03-17MdePkg:Fix typo 'caculate' in MdePkg.Qiu Shumin1-2/+2
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Qiu Shumin <shumin.qiu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Bruce Cran <bruce.cran@gmail.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17057 6f19259b-4bc3-4df7-8a09-765794883524
2013-12-31Update MemoryAllocationLib.AllocateAlignedPages API comments for memory ↵Liming Gao1-1/+5
overflow ASSERT case. Signed-off-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15033 6f19259b-4bc3-4df7-8a09-765794883524
2010-07-28Enhance SmmMemoryAllocationLib Free function implementation to call gSmst or ↵lgao41-3/+144
gBS Free service according to the buffer in or out of SMRAM range. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10700 6f19259b-4bc3-4df7-8a09-765794883524
2010-06-30Minor grammatical work--mostly adding periods. Items with ONLY period added ↵myronporter1-119/+132
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) git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10615 6f19259b-4bc3-4df7-8a09-765794883524
2010-06-26Minor grammatical work--mostly adding periods. Items with ONLY period added ↵myronporter1-4/+4
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) git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10604 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@10415 6f19259b-4bc3-4df7-8a09-765794883524
2010-02-14Add Memory Allocation Library instance for modules of type DXE_SMM_DRIVERmdkinney1-0/+823
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10001 6f19259b-4bc3-4df7-8a09-765794883524
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