Patrick Rudolph uploaded patch set #6 to this change.

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[RFC]drivers/smmstore: Implement SMMSTORE version 2

The SMMSTORE version 2 is a complete redesign of the current driver.

Some key features:
* Uses a fixed communication buffer instead writing to arbitrary ring0
  memory addresses
* Gives the caller full control over the used data format
* Splits the store into smaller chunks to allow fault tolerant updates
* Don't provide feedback about the actual read/written bytes
* Return an error if the requested operation would overflow the
  communication buffer

Seperates the SMMSTORE into 64KiB blocks that can individually be
read/written/erased. To be used by payloads that implement a
FaultTolerant Variable store like Tianocore.

The implementation has been tested against EDK2 master.

An example EDK2 implementation can be found here:
https://github.com/9elements/edk2-1/commit/7c5f0f6bee86dd0a94251b82f0e6f3a1081752bb

Change-Id: I25e49d184135710f3e6dd1ad3bed95de950fe057
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
---
M Documentation/drivers/index.md
A Documentation/drivers/smmstorev2.md
M payloads/libpayload/include/coreboot_tables.h
M src/commonlib/include/commonlib/cbmem_id.h
M src/commonlib/include/commonlib/coreboot_tables.h
M src/drivers/smmstore/Kconfig
M src/drivers/smmstore/Makefile.inc
A src/drivers/smmstore/ramstage.c
M src/drivers/smmstore/smi.c
M src/drivers/smmstore/store.c
M src/include/smmstore.h
M src/lib/coreboot_table.c
12 files changed, 656 insertions(+), 9 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/20/40520/6

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