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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1121 To produce a EFI_BLOCK_IO_PROTOCOL instance in Emulator platform, EmulatorPkg defines the EMU_IO_THUNK_PROTOCOL. OS dependent layer needs to produce this protocol implementation and a generic OS independent layer consumes this protocol to produce EFI_BLOCK_IO_PROTOCOL. EMU_IO_THUNK_PROTOCOL can also be used to abstract the OS dependent IO operation for other UEFI protocols, e.g.: GOP, SimpleFileSystem and etc. It contains two interfaces Open() and Close(). Open() creates the specific IO instances, e.g. for Block IO access, File System access, Screen access, etc. Close() destroys the specific IO instances. Later on the Emulator generic module (e.g.: EmuBlockIoDxe) calls Open() to create the IO instance in DriverBindingStart() and calls Close() in DriverBindingStop(). But today's implementation of DriverBindingStop() contains a bug that it calls Close() before uninstalling the EFI_BLOCK_IO_PROTOCOL. It's a mistake in code. Take EFI_BLOCK_IO for example, the uninstallation may cause the upper layer driver that consumes EFI_BLOCK_IO call BlockIo.Reset(), which consequently calls EmuBlockIo.Reset(). But the EmuBlockIo instance is already destroyed by Close() that happens before uninstallation. So a proper implementation is to call Close() after uninstallation succeeds. REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1121 Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Andrew Fish <afish@apple.com> Reviewed-by: Hao Wu <hao.a.wu@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.