[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
......................................................................

Patch Set 7: Code-Review+1

(1 comment)

https://review.coreboot.org/c/coreboot/+/37392/7/src/cpu/x86/smm/smm_stub.S 
File src/cpu/x86/smm/smm_stub.S:

https://review.coreboot.org/c/coreboot/+/37392/7/src/cpu/x86/smm/smm_stub.S@... 
PS7, Line 190: #include <cpu/x86/64bit/entry64.inc>
> Maybe some idea's for moving the page tables into SMM (for follow up patches): […]

Copying the PGTBL won't work as the pointers to the next level will be incorrect.

There exists a 4G page table generator in SmmStc.c (stm_gen_4g_pagetable_x64(uint32_t pagetable_base)) that could be used (or modified to suit).