smmstore: Add a key/val store facility in flash, mediated through SMM

It exposes an interface that is as generic as possible, so payloads
and/or kernels can use it for their data.

Change-Id: I9553922f9dfa60b9d4b3576973ad4b84d3fe2fb5
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/25182
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/drivers/smmstore/Kconfig b/src/drivers/smmstore/Kconfig
new file mode 100644
index 0000000000..4bb48f7e08
--- /dev/null
+++ b/src/drivers/smmstore/Kconfig
@@ -0,0 +1,32 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2018 The Chromium OS Authors.  All rights reserved.
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+config SMMSTORE
+	bool "Support for flash based, SMM mediated data store"
+	default n
+	depends on BOOT_DEVICE_SUPPORTS_WRITES
+	select SPI_FLASH_SMM if BOOT_DEVICE_SPI_FLASH_RW_NOMMAP
+
+if SMMSTORE
+config SMMSTORE_REGION
+	string "fmap region in which SMM store file is kept"
+	default "RW_LEGACY" if CHROMEOS
+	default "COREBOOT"
+
+config SMMSTORE_FILENAME
+	string "SMM store file name"
+	default "smm store"
+
+endif