[coreboot-gerrit] Change in coreboot[master]: [RFC]cpu/x86/smm: Add a unified way of handling save_states

[Arthur Heymans (Code Review)]

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

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

https://review.coreboot.org/c/coreboot/+/36661

to look at the new patch set (#2).

Change subject: [RFC]cpu/x86/smm: Add a unified way of handling save_states
......................................................................

[RFC]cpu/x86/smm: Add a unified way of handling save_states

This adds common code to handle SMM save states based on the SMM
revision.

example:
SMM code needing access to eax from save state would do the following

struct smm_save_state_ops ops = get_save_state_ops();
uint64_t rax;
int node;

for (node = 0; node < CONFIG_MAX_CPUS; node++) {
    if (ops.get_reg(node, RAX, &rax))
        	error...
        rax &= MAX_UINT32;
        do_stuff...
}

UNTESTED.

Change-Id: Ide7ccc44dbcc864e70463ef318dc1858b51183dc
Signed-off-by: Arthur Heymans 
---
M src/cpu/x86/smm/Makefile.inc
A src/cpu/x86/smm/smm_save_state.c
M src/include/cpu/x86/smm.h
3 files changed, 311 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/61/36661/2