https://bugzilla.tianocore.org/show_bug.cgi?id=1617
gEdkiiPeiFirmwareVolumeInfoStoredHashFvPpiGuid should be installed by
platform to pass FV hash information to the common FV verify/report
driver, in which the hash value will be calculated again based on the
information fed in and then verified.
The information passed in this PPI include:
- FVs location in flash and length
- Hash values for different boot mode
The hash value must be calculated in following way (if 3 FVs to calc):
FV1 -> Hash1
FV2 -> Hash2
FV3 -> Hash3
Hash1 + Hash2 + Hash3 -> HashAll
Only HashAll is stored in this PPI. The purposes for this algorithm
are two:
1. To report each FV's hash to TCG driver and verify HashAll at the
same time without the burden to calculate the hash twice;
2. To save hash value storage due to potential hardware limitation
Different boot mode may have its own hash value so that each mode can
decide which FV will be verified. For example, for the sake of performance,
S3 may choose to skip some FVs verification and normal boot will verify
all FVs it concerns.
So in this PPI, each FV information has flag to indicate which boot mode
it will be taken into hash calculation.
And if multiple hash values passed in this PPI, each has a flag to indicate
which boot mode it's used for. Note one hash value supports more than one
boot modes if they're just the same.
PcdStatusCodeFvVerificationPass and PcdStatusCodeFvVerificationFail are
introduced to report status back to platform, and platform can choose how
to act upon verification success and failure.
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: "Hernandez Beltran, Jorge" <jorge.hernandez.beltran@intel.com>
Cc: Harry Han <harry.han@intel.com>
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>
Jian J Wang