Change in coreboot[master]: cpu/x86/lapic: Unconditionally use CPUID leaf 0xb if available

[Angel Pons (Code Review)]

Attention is currently required from: Wonkyu Kim, Tim Wawrzynczak, Kyösti Mälkki, Felix Held.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58386 )

Change subject: cpu/x86/lapic: Unconditionally use CPUID leaf 0xb if available
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Patch Set 4: Code-Review+1

(2 comments)

File src/cpu/x86/smm/smm_stub.S:

https://review.coreboot.org/c/coreboot/+/58386/comment/bff3b227_345619dd 
PS4, Line 108: 	jc	1f
> I always confuse these conditionals, jumps if eax < 0xb ?

JC, JB, JNAE = Jump if CF = 1

The code looks sane to me.

https://review.coreboot.org/c/coreboot/+/58386/comment/e8e673cc_d6d054ad 
PS4, Line 124: 	cmp	(%ebx, %ecx, 2), %ax
> Does it make sense to optimise the table to 16bits of LAPIC ID?

This is an idea for a follow-up, right?