[coreboot-gerrit] Change in coreboot[master]: security/intel/txt: Improve MTRR setup for GETSEC[ENTERACCS]

[Angel Pons (Code Review)]

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/44880 )

Change subject: security/intel/txt: Improve MTRR setup for GETSEC[ENTERACCS]
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Patch Set 8:
> Patch Set 8:
>
> Can the MTRR operations moved to C?
> That would make it easier to review and it would be possible to use existing common code.

I use the same assembly code to invoke GETSEC in romstage, and I need to tear down CAR before reprogramming the MTRRs. And this is required on LT-CX platforms, since a reset with secrets in memory will block the memory controller until one invokes the SCLEAN function of the BIOS ACM.

So yes, it could be done, but would not work for pre-RAM stages.