From 9360feaf5121fb0b4b2d63e3168effe066650071 Mon Sep 17 00:00:00 2001 From: Patrick Georgi Date: Wed, 14 Mar 2018 21:11:21 +0100 Subject: 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 Reviewed-on: https://review.coreboot.org/25182 Reviewed-by: Stefan Reinauer Tested-by: build bot (Jenkins) --- src/include/smmstore.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 src/include/smmstore.h (limited to 'src/include') diff --git a/src/include/smmstore.h b/src/include/smmstore.h new file mode 100644 index 0000000000..685a425dab --- /dev/null +++ b/src/include/smmstore.h @@ -0,0 +1,52 @@ +/* + * 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. + */ + +#ifndef _SMMSTORE_H_ +#define _SMMSTORE_H_ + +#include +#include + +#define SMMSTORE_APM_CNT 0xed + +#define SMMSTORE_RET_SUCCESS 0 +#define SMMSTORE_RET_FAILURE 1 +#define SMMSTORE_RET_UNSUPPORTED 2 + +#define SMMSTORE_CMD_CLEAR 1 +#define SMMSTORE_CMD_READ 2 +#define SMMSTORE_CMD_APPEND 3 + +struct smmstore_params_read { + void *buf; + ssize_t bufsize; +}; + +struct smmstore_params_append { + void *key; + size_t keysize; + void *val; + size_t valsize; +}; + +/* SMM responder */ +uint32_t smmstore_exec(uint8_t command, void *param); + +/* implementation */ +int smmstore_read_region(void *buf, ssize_t *bufsize); +int smmstore_append_data(void *key, uint32_t key_sz, + void *value, uint32_t value_sz); +int smmstore_clear_region(void); +#endif -- cgit v1.2.3