mirror of
https://github.com/acidanthera/audk.git
synced 2025-04-08 17:05:09 +02:00
7aee391fa3
Register an ExitBootServices() callback that tears down all IOMMU mappings, without modifying the UEFI memory map. The trick is that in the ExitBootServices() callback, we don't immediately do the work; instead we signal another (private) event. Normally the dispatch order of ExitBootServices() callbacks is unspecified (within the same task priority level anyway). By queueing another function, we delay the unmapping until after all PciIo and Virtio drivers abort -- in their own ExitBootServices() callbacks -- the pending DMA operations of their respective controllers. Furthermore, the fact that IoMmuUnmapWorker() rewrites client-owned memory when it unmaps a Write or CommonBuffer bus master operation, is safe even in this context. The existence of any given "MapInfo" in "mMapInfos" implies that the client buffer pointed-to by "MapInfo->CryptedAddress" was live when ExitBootServices() was entered. And, after entering ExitBootServices(), nothing must have changed the UEFI memory map, hence the client buffer at "MapInfo->CryptedAddress" still exists. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Brijesh Singh <brijesh.singh@amd.com> Tested-by: Brijesh Singh <brijesh.singh@amd.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.