1. record the distance of two neighboring VAR_ADDED type variables rather than the offset of each variable. As the field recording this info is UINT16 width, the latter causes in IA32/X64 platform, it can only cache those variables from offset 0 to offset 2^16; in IPF platform, from offset 0 to offset 2^18(extend the scope by left-shift the offset two bits).
when taking the former algorithm, the max range of caching variable is from offset 0 to offset 122*(2^16)
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8625 6f19259b-4bc3-4df7-8a09-765794883524
2. move VariableFormat.h into GUID directory and change the “Signature” field of the VARIABLE_STORE_HEADER to gEfiVariableGuid value.
3. merging VARIABLE_INFO_ENTRY structure into the new Include/Guid/VariableFormat.h
4. change gEfiVariableInfoGuid into gEfiVariableGuid.
5. modify FDF files to use new guid value instead of the original signature.
6. all code related to signature is changed to use guid value.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7728 6f19259b-4bc3-4df7-8a09-765794883524
2) Add HEADER_VALID_ONLY state of variable, which represents only the header is valid and the data/name is stale. This may be caused by incomplete data updating. Adding the state helps to check whether the header is valid. If variable header is valid, then we must skip the data of variable with the valid size. If the header is invalid, we should only skip the header of variable.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4555 6f19259b-4bc3-4df7-8a09-765794883524
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