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13a47cf925
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1481 Today's MtrrLib contains a bug, for example: when the original cache setting is WB for [0xF_0000, 0xF_8000) and, a new request to set [0xF_0000, 0xF_4000) to WP, the cache setting for [0xF_4000, 0xF_8000) is reset to UC. The reason is when MtrrLibSetBelow1MBMemoryAttribute() is called the WorkingFixedSettings doesn't contain the actual MSR value stored in hardware, but when writing the fixed MTRRs, the code logic assumes WorkingFixedSettings contains the actual MSR value. The new fix is to change MtrrLibSetBelow1MBMemoryAttribute() to calculate the correct ClearMasks[] and OrMasks[], and use them directly when writing the fixed MTRRs. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ray Ni <ray.ni@intel.com> Reviewed-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
EDK II Project
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from www.uefi.org.
Contributions to the EDK II open source project are covered by the TianoCore Contribution Agreement 1.1
The majority of the content in the EDK II open source project uses a BSD 2-Clause License. The EDK II open source project contains the following components that are covered by additional licenses:
- AppPkg/Applications/Python/Python-2.7.2/Tools/pybench
- AppPkg/Applications/Python/Python-2.7.2
- AppPkg/Applications/Python/Python-2.7.10
- BaseTools/Source/C/BrotliCompress
- MdeModulePkg/Library/BrotliCustomDecompressLib
- OvmfPkg
- CryptoPkg/Library/OpensslLib/openssl
The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.