[coreboot-gerrit] Change in coreboot[master]: cpu/x86/smm/smm_stub: Add x86_64 support

[Eugene Myers (Code Review)]

Eugene Myers has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/37392 )

Change subject: cpu/x86/smm/smm_stub: Add x86_64 support
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Patch Set 4: Code-Review-1

(1 comment)

For security reasons, the page tables used in SMM must be located in SMRAM.

https://review.coreboot.org/c/coreboot/+/37392/4/src/cpu/x86/smm/smm_stub.S 
File src/cpu/x86/smm/smm_stub.S:

https://review.coreboot.org/c/coreboot/+/37392/4/src/cpu/x86/smm/smm_stub.S@... 
PS4, Line 216: 	#include <cpu/x86/64bit/exit32.inc>
For security reasons, the 64 bit page-tables that are used in SMM must be located in SMRAM.