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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 __EC_BOARD_CR50_TPM_NVMEM_OPS_H
#define __EC_BOARD_CR50_TPM_NVMEM_OPS_H
enum tpm_read_rv {
TPM_READ_SUCCESS,
TPM_READ_NOT_FOUND,
TPM_READ_TOO_SMALL,
};
enum tpm_write_rv {
TPM_WRITE_CREATED,
TPM_WRITE_UPDATED,
TPM_WRITE_FAIL,
};
enum tpm_nv_hidden_object {
TPM_HIDDEN_U2F_KEK,
TPM_HIDDEN_U2F_KH_SALT,
};
enum tpm_read_rv read_tpm_nvmem(uint16_t object_index,
uint16_t object_size,
void *obj_value);
/*
* The following functions must only be called from the TPM task,
* and only after TPM initialization is complete (specifically,
* after NvInitStatic).
*/
enum tpm_read_rv read_tpm_nvmem_hidden(uint16_t object_index,
uint16_t object_size,
void *obj_value);
enum tpm_write_rv write_tpm_nvmem_hidden(uint16_t object_index,
uint16_t object_size,
void *obj_value,
int commit);
/* return size of hidden nvmem object, 0 if not found */
size_t read_tpm_nvmem_size(uint16_t obj_index);
#endif /* ! __EC_BOARD_CR50_TPM_NVMEM_OPS_H */
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