3e02ebb2bb
PEI variable implementation checks only the variable header signature for validity. This does not seem robust if system crash occurred during previous Reclaim() operation. If the crash occurred while FTW was rewriting the variable FV, the signature could be valid even though the rest of the FV isn't valid. Solution: Add a FaultTolerantWritePei driver to check and provide the FTW last write status, then PEI variable and early phase(before FTW protocol ready) of DXE variable can check the status and determine if all or partial variable data has been backed up in spare block, and then use the backed up data. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14454 6f19259b-4bc3-4df7-8a09-765794883524
62 lines
1.9 KiB
INI
62 lines
1.9 KiB
INI
## @file
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# This driver installs gEdkiiFaultTolerantWriteGuid PPI to inform
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# the check for FTW last write data has been done.
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#
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# Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>
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#
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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##
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[Defines]
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INF_VERSION = 0x00010005
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BASE_NAME = FaultTolerantWritePei
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FILE_GUID = AAC33064-9ED0-4b89-A5AD-3EA767960B22
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MODULE_TYPE = PEIM
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VERSION_STRING = 1.0
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ENTRY_POINT = PeimFaultTolerantWriteInitialize
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#
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# The following information is for reference only and not required by the build tools.
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#
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# VALID_ARCHITECTURES = IA32 X64 IPF EBC
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#
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[Sources]
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FaultTolerantWritePei.c
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[Packages]
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MdePkg/MdePkg.dec
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MdeModulePkg/MdeModulePkg.dec
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[LibraryClasses]
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PeimEntryPoint
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PeiServicesLib
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BaseLib
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DebugLib
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HobLib
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BaseMemoryLib
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PcdLib
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[Guids]
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gEdkiiFaultTolerantWriteGuid ## CONSUMES
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gEdkiiWorkingBlockSignatureGuid ## CONSUMES
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gEfiSystemNvDataFvGuid ## CONSUMES
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[Pcd]
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gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingBase
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gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingBase64
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gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingSize
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gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareBase
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gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareBase64
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gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize
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[Depex]
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TRUE
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