linux/drivers/char/tpm/eventlog/tpm2.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2016 IBM Corporation
 *
 * Authors:
 *      Nayna Jain <[email protected]>
 *
 * Access to TPM 2.0 event log as written by Firmware.
 * It assumes that writer of event log has followed TCG Specification
 * for Family "2.0" and written the event data in little endian.
 * With that, it doesn't need any endian conversion for structure
 * content.
 */

#include <linux/seq_file.h>
#include <linux/fs.h>
#include <linux/security.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/tpm_eventlog.h>

#include "../tpm.h"
#include "common.h"

/*
 * calc_tpm2_event_size() - calculate the event size, where event
 * is an entry in the TPM 2.0 event log. The event is of type Crypto
 * Agile Log Entry Format as defined in TCG EFI Protocol Specification
 * Family "2.0".

 * @event: event whose size is to be calculated.
 * @event_header: the first event in the event log.
 *
 * Returns size of the event. If it is an invalid event, returns 0.
 */
static size_t calc_tpm2_event_size(struct tcg_pcr_event2_head *event,
				   struct tcg_pcr_event *event_header)
{ … }

static void *tpm2_bios_measurements_start(struct seq_file *m, loff_t *pos)
{ … }

static void *tpm2_bios_measurements_next(struct seq_file *m, void *v,
					 loff_t *pos)
{ … }

static void tpm2_bios_measurements_stop(struct seq_file *m, void *v)
{ … }

static int tpm2_binary_bios_measurements_show(struct seq_file *m, void *v)
{ … }

const struct seq_operations tpm2_binary_b_measurements_seqops = …;