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ACPI_CPU_DATA structure first introduced to save data in normal boot phase. Also this data will be used in S3 phase by one PEI driver. So in first phase, this data is been defined to use ACPI NVS memory type and must below 4G. Later in order to fix potential security issue, PiSmmCpuDxeSmm driver added logic to copy ACPI_CPU_DATA (except ResetVector and Stack buffer) to smram at smm ready to lock point. ResetVector must below 1M and Stack buffer is write only in S3 phase, so these two fields not copy to smram. Also PiSmmCpuDxeSmm driver owned the task to restore the CPU setting and it's a SMM driver. After above change, the acpi nvs memory type and below 4G limitation is no longer needed. This change remove the limitation in the comments for ACPI_CPU_DATA definition. Cc: Marvin Häuser <Marvin.Haeuser@outlook.com> Cc: Fan Jeff <vanjeff_919@hotmail.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ruiyu Ni <ruiyu.ni@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com> Tested-by: Laszlo Ersek <lersek@redhat.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.