Change in coreboot[master]: arch/x86: SMBIOS: Improve core count reporting

[Andrey Petrov (Code Review)]

Hello Werner Zeh, David Hendricks, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/36941

to look at the new patch set (#3).

Change subject: arch/x86: SMBIOS: Improve core count reporting
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arch/x86: SMBIOS: Improve core count reporting

Current code uses CPUID leaf 0x1, EBX bits 16:23 to determine number for
"core count". However, it turns out this number has little to do with
real number of cores. According to SDM vol 2A, it stays for "maximum
number of addressable IDs for logical processors in this physical
package". This does not seem to take into account fusing of giving
processor.

The new code determines 'core count' by dividing thread-level cpus by
reported logical cores. This seems to be the only way to arrive
to number of cores as it is reported in official CPU datasheet.

TEST=tested on OCP monolake

Change-Id: Id4ba9e3079f92ffe38f9104ffcfafe62582dd259
Signed-off-by: Andrey Petrov 
---
M src/arch/x86/smbios.c
1 file changed, 20 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/41/36941/3