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/*
* This file is part of the coreboot project.
*
* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Copyright 2018 Facebook Inc.
* Copyright 2018 Siemens AG
*
* 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 TSPI_H_
#define TSPI_H_
#include <security/tpm/tss.h>
#include <commonlib/tcpa_log_serialized.h>
#include <commonlib/region.h>
#include <vb2_api.h>
#define TPM_PCR_MAX_LEN 64
#define HASH_DATA_CHUNK_SIZE 1024
/**
* Clears the pre-RAM tcpa log data and initializes
* any content with default values
*/
void tcpa_preram_log_clear(void);
/**
* Add table entry for cbmem TCPA log.
* @param name Name of the hashed data
* @param pcr PCR used to extend hashed data
* @param diget_algo sets the digest algorithm
* @param digest sets the hash extended into the tpm
* @param digest_len the length of the digest
*/
void tcpa_log_add_table_entry(const char *name, const uint32_t pcr,
enum vb2_hash_algorithm digest_algo,
const uint8_t *digest,
const size_t digest_len);
/**
* Dump TCPA log entries on console
*/
void tcpa_log_dump(void *unused);
/**
* Ask vboot for a digest and extend a TPM PCR with it.
* @param pcr sets the pcr index
* @param diget_algo sets the digest algorithm
* @param digest sets the hash to extend into the tpm
* @param digest_len the length of the digest
* @param name sets additional info where the digest comes from
* @return TPM_SUCCESS on success. If not a tpm error is returned
*/
uint32_t tpm_extend_pcr(int pcr, enum vb2_hash_algorithm digest_algo,
uint8_t *digest, size_t digest_len,
const char *name);
/**
* Issue a TPM_Clear and reenable/reactivate the TPM.
* @return TPM_SUCCESS on success. If not a tpm error is returned
*/
uint32_t tpm_clear_and_reenable(void);
/**
* Start the TPM and establish the root of trust.
* @param s3flag tells the tpm setup if we wake up from a s3 state on x86
* @return TPM_SUCCESS on success. If not a tpm error is returned
*/
uint32_t tpm_setup(int s3flag);
/**
* Measure a given region device and extend given PCR with the result.
* @param *rdev Pointer to the region device to measure
* @param pcr Index of the PCR which will be extended by this measure
* @param *rname Name of the region that is measured
* @return TPM error code in case of error otherwise TPM_SUCCESS
*/
uint32_t tpm_measure_region(const struct region_device *rdev, uint8_t pcr,
const char *rname);
#endif /* TSPI_H_ */
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