Change in ...coreboot[master]: [WIP]arch/x86/postcar: Add x86_64 support

[Patrick Rudolph (Code Review)]

Hello build bot (Jenkins), Patrick Georgi, Martin Roth,

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

https://review.coreboot.org/c/coreboot/+/30500

to look at the new patch set (#4).

Change subject: [WIP]arch/x86/postcar: Add x86_64 support
......................................................................

[WIP]arch/x86/postcar: Add x86_64 support

Add support for loading GDT on x86_64.
Add x86_64 assembly code to do the same as the x86_32 code.

Tested on qemu x86_32 and x86_64 using additional MTRRs.
Needs test on real hardware.

Change-Id: I1c190627f5f0ed6f82738cb99423892382899d7b
Signed-off-by: Patrick Rudolph 
---
M src/arch/x86/Makefile.inc
M src/arch/x86/exit_car.S
M src/arch/x86/gdt_init.S
3 files changed, 75 insertions(+), 13 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/00/30500/4