CVS commit: src/sys/arch/x86/x86

["matthew green" <mrg%netbsd.org@localhost>]

Module Name:    src
Committed By:   mrg
Date:           Fri Jul 28 05:02:13 UTC 2023

Modified Files:
        src/sys/arch/x86/x86: errata.c

Log Message:
x86: make the CPUID list for errata be far less confusing

the 0x80000001 CPUID result needs some parsing to match against
actual family/model/stepping values.  4-bit 'family' values of
15 or 6 change how to parse the 4-bit extended model and 8-bit
extended family value - for family 6 or 15, the extended model
bits (4) are concatenated with the base 4-bits to create an
8-bit value, and for family 15, the family value is addition
of the family value and the 8-bit extended-family value, giving
a range of 0 to 15 + 0xff aka 270.

use a CPUREV(family, model, stepping) macro that builds the
relevant bit-representation of a CPUID, making it far easier
to understand what each entry means, and to add new ones too.

i have confirmed that the emitted cpurevs[] array has the same
values before/after this change, ie, NFCI or observed.


To generate a diff of this commit:
cvs rdiff -u -r1.32 -r1.33 src/sys/arch/x86/x86/errata.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.