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Like "gSmmCr4" in the previous patch, "gSmmCr0" is not only used for machine code patching, but also as a means to communicate the initial CR0 value from SmmRelocateBases() to InitSmmS3ResumeState(). In other words, the last four bytes of the "mov eax, Cr0Value" instruction's binary representation are utilized as normal data too. In order to get rid of the DB for "mov eax, Cr0Value", we have to split both roles, patching and data flow. Introduce the "mSmmCr0" global (SMRAM) variable for the data flow purpose. Rename the "gSmmCr0" variable to "gPatchSmmCr0" so that its association with PatchInstructionX86() is clear from the declaration, change its type to X86_ASSEMBLY_PATCH_LABEL, and patch it with PatchInstructionX86(), to the value now contained in "mSmmCr0". This lets us remove the binary (DB) encoding of "mov eax, Cr0Value" in "SmmInit.nasm". Cc: Eric Dong <eric.dong@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=866 Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Liming Gao <liming.gao@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.