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/* Copyright 2017 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __CROS_EC_ROLLBACK_H
#define __CROS_EC_ROLLBACK_H
#define CROS_EC_ROLLBACK_COOKIE 0x0b112233
#ifndef __ASSEMBLER__
/**
* Get minimum version set by rollback protection blocks.
*
* @return Minimum rollback version, 0 if neither block is initialized,
* negative value on error.
*/
int rollback_get_minimum_version(void);
/**
* Update rollback protection block to the version passed as parameter.
*
* @param next_min_version Minimum version to write in rollback block.
*
* @return EC_SUCCESS on success, EC_ERROR_* on error.
*/
int rollback_update_version(int32_t next_min_version);
/**
* Add entropy to the rollback block.
*
* @param data Data to be added to rollback block secret (after hashing)
* @param len data length
*
* @return EC_SUCCESS on success, EC_ERROR_* on error.
*/
int rollback_add_entropy(uint8_t *data, unsigned int len);
/**
* Lock rollback protection block, reboot if necessary.
*
* @return EC_SUCCESS if rollback was already protected.
*/
int rollback_lock(void);
#endif
#endif /* __CROS_EC_ROLLBACK_H */
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