[S] Change in coreboot[main]: cpu/x86: Add 1GiB pages for memory access up to 512GiB

[Ashish Kumar Mishra (Code Review)]

Attention is currently required from: Ashish Kumar Mishra, Jérémy Compostella, Paul Menzel, Subrata Banik, Wonkyu Kim.

Hello Arthur Heymans, Jérémy Compostella, Subrata Banik, Wonkyu Kim, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/80088?usp=email

to look at the new patch set (#6).

Change subject: cpu/x86: Add 1GiB pages for memory access up to 512GiB
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cpu/x86: Add 1GiB pages for memory access up to 512GiB

Current pagetable implementation allows memory access up to 4GiB using
2MiB pages. If user wants to access more than 4GiB with a 2MiB page it
will require more pagetable entries. By using a 1GiB page table, users
can access more than 4GiB of memory while reducing the number of
pagetable entries. This patch enables memory access up to 512GiB through
1GiB pages by selecting USE_1G_PAGES_TLB in Kconfig.

TEST: Verified in 64bit mode boot and access above 4GiB

Change-Id: Id569ae5b50abf5b72e4db33b5e4cd802399e76ec
Signed-off-by: Ashish Kumar Mishra 
---
M src/cpu/x86/64bit/Makefile.mk
A src/cpu/x86/64bit/pt1G.S
M src/cpu/x86/Kconfig
3 files changed, 43 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/88/80088/6