blob: d1bc433dcde63685495d9f287b8f3e4d7b6cbfa3 [file] [log] [blame]
/* Copyright (c) 2013 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.
* Functions for querying, manipulating and locking rollback indices
* stored in the TPM NVRAM.
#include "tss_constants.h"
struct vb2_context;
enum vb2_pcr_digest;
/* TPM NVRAM location indices. */
#define FIRMWARE_NV_INDEX 0x1007
#define KERNEL_NV_INDEX 0x1008
/* 0x1009 used to be used as a backup space. Think of conflicts if you
* want to use 0x1009 for something else. */
#define BACKUP_NV_INDEX 0x1009
#define FWMP_NV_INDEX 0x100a
#define REC_HASH_NV_INDEX 0x100b
/* Structure definitions for TPM spaces */
/* Flags for firmware space */
* Last boot was developer mode. TPM ownership is cleared when transitioning
* to/from developer mode.
/* All functions return TPM_SUCCESS (zero) if successful, non-zero if error */
uint32_t antirollback_read_space_firmware(struct vb2_context *ctx);
* Write may be called if the versions change.
uint32_t antirollback_write_space_firmware(struct vb2_context *ctx);
* Lock must be called.
uint32_t antirollback_lock_space_firmware(void);
/* Read recovery hash data from TPM. */
uint32_t antirollback_read_space_rec_hash(uint8_t *data, uint32_t size);
/* Write new hash data to recovery space in TPM. */
uint32_t antirollback_write_space_rec_hash(const uint8_t *data, uint32_t size);
/* Lock down recovery hash space in TPM. */
uint32_t antirollback_lock_space_rec_hash(void);
* The following functions are internal apis, listed here for use by unit tests
* only.
* Ask vboot for a digest and extend a TPM PCR with it.
uint32_t tpm_extend_pcr(struct vb2_context *ctx, int pcr,
enum vb2_pcr_digest which_digest);
* Issue a TPM_Clear and reenable/reactivate the TPM.
uint32_t tpm_clear_and_reenable(void);
* Start the TPM and establish the root of trust for the antirollback mechanism.
uint32_t setup_tpm(struct vb2_context *ctx);
#endif /* ANTIROLLBACK_H_ */