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path: root/MdePkg/Library/BaseLib/CpuDeadLoop.c
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2024-06-12MdePkg/BaseLib: Let CpuDeadLoop() be breakable in debuggerRay Ni1-2/+4
Starting from certain version of Visual Studio C compiler (I don’t have the exact version. I am using VS2019), CpuDeadLoop is optimized quite well by compiler. The compiler does not generate instructions that jump out of the loop when the "Index" is non-zero. It becomes harder/impossible for developers to break out of the dead-loop in debugger. The new version of CpuDeadLoop() compares a volatile global to a volatile local. This forces 2 reads and a comparison on every loop iteration. The local variable can be set to 1 to exit the loop without modifying the global variable. Using VS2019 with max opt enabled, The dead-loop can be exit by setting Index to 1 in a debugger. Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
2021-12-07MdePkg: Apply uncrustify changesMichael Kubacki1-3/+1
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>
2021-03-25MdePkg: use CpuPause() in CpuDeadLoop()Ankur Arora1-1/+3
CpuPause() might allow the CPU to go into a lower power state state while we spin. On X86, CpuPause() executes a PAUSE instruction which the Intel and AMD specs describe as follows: Intel: "PAUSE: An additional function of the PAUSE instruction is to reduce the power consumed by a processor while executing a spin loop. A processor can execute a spin-wait loop extremely quickly, causing the processor to consume a lot of power while it waits for the resource it is spinning on to become available. Inserting a pause instruction in a spin-wait loop greatly reduces the processor?s power consumption." AMD: "PAUSE: Improves the performance of spin loops, by providing a hint to the processor that the current code is in a spin loop. The processor may use this to optimize power consumption while in the spin loop. Architecturally, this instruction behaves like a NOP instruction." On RISC-V and ARM64, CpuPause() executes a NOP, which is no worse than the tight loop we have. Cc: Liming Gao <gaoliming@byosoft.com.cn> Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.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>
2010-06-24Minor grammatical work--mostly adding periods. Items with ONLY period added ↵myronporter1-1/+1
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@10596 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@10405 6f19259b-4bc3-4df7-8a09-765794883524
2009-02-10Change style 0 == Index to Index == 0lgao41-1/+1
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7493 6f19259b-4bc3-4df7-8a09-765794883524
2008-12-29Update copyright for files modified in this yearqhuang81-1/+1
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7148 6f19259b-4bc3-4df7-8a09-765794883524
2008-09-17remove unnecessary comments introduced by tools from MdePkg. The regular ↵vanjeff1-3/+1
express is "//^p//[ ]Include[ ]common[ ]header[ ]file[ ]for[ ]this[ ]module[.]^p//" git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5911 6f19259b-4bc3-4df7-8a09-765794883524
2008-07-08Code scrub:yshang11-1/+1
MdePkg/Library/BaseCacheMaintenanceLib MdePkg/Library/BaseDebugLibNull MdePkg/Library/BaseIoLibIntrinsic MdePkg/Library/BaseLib MdePkg/Library/BaseMemoryLib MdePkg/Library/BaseMemoryLibMmx MdePkg/Library/BaseMemoryLibOptDxe MdePkg/Library/BaseMemoryLibOptPei MdePkg/Library/BaseMemoryLibRepStr MdePkg/Library/BaseMemoryLibSse2 MdePkg/Library/BasePeCoffGetEntryPointLib git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5426 6f19259b-4bc3-4df7-8a09-765794883524
2007-08-18Use <> in #include statements instead of "" for include files from packagesmdkinney1-1/+1
Use '/' instead of '\' for all file references Remove redundant use of $(WORKSPACE) from DSC, FDF, INF, and DEC files git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3673 6f19259b-4bc3-4df7-8a09-765794883524
2007-07-06add in proper include for this file.qwang121-0/+2
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3128 6f19259b-4bc3-4df7-8a09-765794883524
2007-06-30Removed CommonHeader.h generated file from the MdePkg. AJFISH1-1/+1
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2922 6f19259b-4bc3-4df7-8a09-765794883524
2007-06-22Import some basic libraries instances for Mde Packages. vanjeff1-0/+38
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2704 6f19259b-4bc3-4df7-8a09-765794883524
2007-06-01Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break ↵lhauch1-33/+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
2006-04-22Initial import.bbahnsen1-0/+33
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 2026-09-29 12:14:31 +0300