[S] Change in coreboot[main]: drivers/smmstore: add logic to disable capsule update handling code

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Arthur Heymans, Felix Held, Krystian Hebel, Martin L Roth, Patrick Rudolph, Sergii Dmytruk.

Hello Arthur Heymans, Felix Held, Krystian Hebel, Martin L Roth, Patrick Rudolph, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/83425?usp=email

to look at the new patch set (#7).

The following approvals got outdated and were removed:
Code-Review+2 by Martin L Roth, Verified+1 by build bot (Jenkins)

The change is no longer submittable: Code-Review and Verified are unsatisfied now.

Change subject: drivers/smmstore: add logic to disable capsule update handling code
......................................................................

drivers/smmstore: add logic to disable capsule update handling code

This adds a call to SMMSTORE that saves information about availability
of capsules in SMM memory. This new call is ignored when run more than
once, which means that there should be no way of enabling full flash
handling after it was disabled and vice versa.

The call should be always made by the firmware to lock further calls,
otherwise OS could gain full flash access. This is done on entry to
BS_POST_DEVICE, after capsules are obtained in BS_DEV_INIT.

Change-Id: I3dc175ea313aae1edae304520595b82db7206cbb
Signed-off-by: Krystian Hebel 
Signed-off-by: Sergii Dmytruk 
---
M src/drivers/efi/capsules.c
M src/drivers/smmstore/smi.c
M src/drivers/smmstore/store.c
M src/include/smmstore.h
4 files changed, 28 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/25/83425/7