[S] Change in coreboot[master]: soc/amd/smm: Check the SMM TSEG size

[Himanshu Sahdev (Code Review)]

Attention is currently required from: Arthur Heymans, Bao Zheng, Felix Held, Fred Reitberger, Jason Glenesk, Matt DeVillier, Raul Rangel, Zheng Bao.

Himanshu Sahdev has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75405?usp=email )

Change subject: soc/amd/smm: Check the SMM TSEG size
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Patch Set 3:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/75405/comment/d0f75c7d_a317ab10 :
PS3, Line 10: The SMM TSEG size should be less than SMM reserved size, bigger than
            : 8M, and power of 2.
> > For a number, it is a power of 2 AND it is bigger than 8M, it is 8M, 16M, 32M, ...
> > Does it have a "granularity of 128K"?
>
> granularity 128K mean it needs to be larger than 128K and a power of 2.

+1, As per AMD64 Architecture Progrmamer's Manual, Section 10.2.5 SMRAM Protected Areas:
`The TSeg range must be aligned to a 128 Kbyte boundary and the minimum TSeg
size is 128 Kbytes.`
But is Bao Zheng trying to put an extra sanity check here to ensure expected size to be greater than equal to 8Mib for some reason?