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| author | Star Zeng <star.zeng@intel.com> | 2013-07-03 09:08:40 +0000 |
|---|---|---|
| committer | lzeng14 <lzeng14@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-07-03 09:08:40 +0000 |
| commit | 3e02ebb2bbe0fd4da880511b1f35951e1c4b8404 (patch) | |
| tree | 95fc155e9d76e163cd295db373734cc276f4abc6 /MdeModulePkg/MdeModulePkg.dec | |
| parent | 70066a82a54bd5136556dff3ea76dff035a3aca3 (diff) | |
| download | edk2-3e02ebb2bbe0fd4da880511b1f35951e1c4b8404.zip edk2-3e02ebb2bbe0fd4da880511b1f35951e1c4b8404.tar.gz edk2-3e02ebb2bbe0fd4da880511b1f35951e1c4b8404.tar.bz2 | |
MdeModulePkg: Variable drivers robustly handle crashes during Reclaim().
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
Diffstat (limited to 'MdeModulePkg/MdeModulePkg.dec')
| -rw-r--r-- | MdeModulePkg/MdeModulePkg.dec | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index 3c07c69..7db47ec 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -119,6 +119,14 @@ # Include/Guid/SystemNvDataGuid.h
gEfiSystemNvDataFvGuid = { 0xFFF12B8D, 0x7696, 0x4C8B, { 0xA9, 0x85, 0x27, 0x47, 0x07, 0x5B, 0x4F, 0x50 }}
+ ## GUID used as the signature of FTW working block header.
+ # Include/Guid/SystemNvDataGuid.h
+ gEdkiiWorkingBlockSignatureGuid = { 0x9e58292b, 0x7c68, 0x497d, { 0xa0, 0xce, 0x65, 0x0, 0xfd, 0x9f, 0x1b, 0x95 }}
+
+ ## GUID used to build FTW last write data hob and install PPI to inform the check for FTW last write data has been done.
+ # Include/Guid/FaultTolerantWrite.h
+ gEdkiiFaultTolerantWriteGuid = { 0x1d3e9cb8, 0x43af, 0x490b, { 0x83, 0xa, 0x35, 0x16, 0xaa, 0x53, 0x20, 0x47 }}
+
## Guid specify the device is the console out device.
# Include/Guid/ConsoleOutDevice.h
gEfiConsoleOutDeviceGuid = { 0xD3B36F2C, 0xD551, 0x11D4, { 0x9A, 0x46, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D }}
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