[S] Change in coreboot[main]: cpu/x86/64bit: Back up/restore CR3 on mode switch

[Patrick Rudolph (Code Review)]

Attention is currently required from: Arthur Heymans, Felix Held, Jérémy Compostella, Patrick Rudolph, Paul Menzel.

Hello Arthur Heymans, Felix Held, Jérémy Compostella, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/82164?usp=email

to look at the new patch set (#10).

The following approvals got outdated and were removed:
Code-Review+1 by Felix Held, Code-Review+2 by Arthur Heymans, Verified-1 by build bot (Jenkins)

Change subject: cpu/x86/64bit: Back up/restore CR3 on mode switch
......................................................................

cpu/x86/64bit: Back up/restore CR3 on mode switch

Store CR3 on stack and restore it when returning from protected
mode call, since the stage might have set up different page tables
than the default ones linked into all stages.

Tested: intel/archercity still boots to payload in x86_64.

Change-Id: If94a24925994ac9599be24f6454ea28d02ff0c67
Signed-off-by: Patrick Rudolph 
---
M src/cpu/x86/64bit/mode_switch.S
1 file changed, 10 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/64/82164/10