Decode the following HPE OEM records:
199: CPU Microcode Patch.
The 199 record contains a variable number of the tuple:
{ <DWORD: Patch ID, DWORD Date, DWORD CPU ID> ... }
Which are taken from the patch header and describe the revision
of the microcode patch.
The CPU ID cooreponds to the "ID" field of type 4 records.
As a given BIOS can support multiple CPU SKUs, the BIOS may contain
patches for CPUs not present on the system.
===== Changes for v2 =====
o Depends upon the in progress patch to create function dmi_print_cpuid()
so we can print the CPU ID in human friendly form.
o Print date in ISO 8601 format: YYYY-MM-DD
o Use pr_attr/pr_subattr to visually group the individual ucode patches.
o Print patch id in 0x%x format to be consistent with intel documentation.
o Change order of fields to have CPU ID 1st, then date, then patchid.
===== Changes for v3 =====
o The CPUID field on AMD patches isn't the output of the CPUID instruction
to match against like Intel. Rather for AMD one compares against:
((Extended Family ID | Extended Model Id) >> 8) | (Model ID|Stepping ID)
In general, this would not be invertiable, except in the decode of 199:
a. We know that the chip is either Intel or AMD.
b. Proliant that we're decoding the OEM 199 record on don't have the
older AMD processors which have family <= 15. This allows us to
reconstruct the CPUID by suppling the base family.
o restrict to Gen9 and later.
===== Changes for v4 =====
o return 0 if (gen < G9).
o change comment from "//" to "/* ... */"
o Fix two double spaces.
Note: Depends upon Jean's in progress 4-Mar patch to create function
dmi_print_cpuid().
Jerry Hoemann (1):
dmioem: HPE OEM Record 199
dmioem.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
--
2.31.1
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