Hi All,
As DMTF already gives SMBIOS 3.00d even it is still Work in Progress Documents,
I would like to hear from you about how to implement 64-bit entrypoint/table
together with 32-bit entrypoint/table for EDKII SMBIOS 3.0 support. I listed
several options below for EDKII SMBIOS module to produce 32-bit and 64-bit
entrypoint/table:
Option 1:
We produce both 32-bit and 64-bit entrypoint. We produce 32-bit table below
4GB, we produce 64-bit table anywhere up to max CPU physical address. We add a
SMBIOS record to both 32-bit and 64-bit table. And if these conditions below
happen, we add one SMBIOS record to 64-bit table ONLY:
1. If we find 32-bit entrypoint cannot be allocated below 4GB.
2. If we find memory below 4GB is not enough when a new SMBIOS record is
added/updated.
3. If we meet a length of record exceed 65535. As 32-bit SMBIOS entry
point defines "Maximum Structure Size" for a single record with WORD.
4. If we find the size of entire SMBIOS table will exceed 65535. As
32-bit SMBIOS entry point defines "Structure Table Length" for entire SMBIOS
table with WORD.
Option 2:
We introduce a new PCD PcdSmbiosEntryPointProvideMethod to
provide standalone choices.
1. 0b - 32-bit entry point and 32-bit table.
2. 1b - 64-bit entry point and 64-bit table.
3. 11b - Both 32-bit and 64-bit entry point. The code logic follows
Option 1.
Option 3:
We introduce a new PCD PcdSmbios2xCompatibility to provide 2
choices:
1. When PcdSmbios2xCompatibility is set to TRUE, 32-bit entrypoint/table
will be produced following SMBIOS 2.x spec. There are several options for
64-bit entrypoint/table: Produce/Not Produce, 4GBBelow/AnyWhereInMemory. It
depends on how we want to use 64-bit entrypoint/table when we still want to
keep compatibility. Welcome any ideas here.
2. When PcdSmbios2xCompatibility is set to FALSE, only 64-bit
entrypoint/table will be produced at anywhere in memory.
If you have other options, please feel free to discuss.
Thank you
Regards
Elvin Li
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