plat/rpi/rpi3/rpi3_bl1_mboot.c

/*
 * Copyright (c) 2025, Arm Limited. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <stdarg.h>
#include <stdint.h>

#include <common/desc_image_load.h>
#include <common/ep_info.h>
#include <drivers/auth/crypto_mod.h>
#include <drivers/measured_boot/event_log/event_log.h>
#include <drivers/measured_boot/metadata.h>
#include <plat/arm/common/plat_arm.h>
#include <plat/common/platform.h>
#include <platform_def.h>

/* Event Log data */
uint8_t event_log[PLAT_ARM_EVENT_LOG_MAX_SIZE];

/* RPI3 table with platform specific image IDs, names and PCRs */
const event_log_metadata_t rpi3_event_log_metadata[] = {
	{ FW_CONFIG_ID, MBOOT_FW_CONFIG_STRING, PCR_0 },
	{ TB_FW_CONFIG_ID, MBOOT_TB_FW_CONFIG_STRING, PCR_0 },
	{ BL2_IMAGE_ID, MBOOT_BL2_IMAGE_STRING, PCR_0 },

	{ EVLOG_INVALID_ID, NULL, (unsigned int)(-1) }	/* Terminator */
};

void bl1_plat_mboot_init(void)
{
	event_log_init(event_log, event_log + sizeof(event_log));
	event_log_write_header();
}

void bl1_plat_mboot_finish(void)
{
	size_t event_log_cur_size;
	image_desc_t *image_desc;
	entry_point_info_t *ep_info;

	event_log_cur_size = event_log_get_cur_size(event_log);
	image_desc = bl1_plat_get_image_desc(BL2_IMAGE_ID);
	assert(image_desc != NULL);

	/* Get the entry point info */
	ep_info = &image_desc->ep_info;
	ep_info->args.arg2 = (uint64_t) event_log;
	ep_info->args.arg3 = (uint32_t) event_log_cur_size;
}

int plat_mboot_measure_image(unsigned int image_id, image_info_t *image_data)
{
	int rc = 0;
	unsigned char hash_data[CRYPTO_MD_MAX_SIZE];
	const event_log_metadata_t *metadata_ptr = rpi3_event_log_metadata;

	rc = event_log_measure(image_data->image_base, image_data->image_size, hash_data);
	if (rc != 0) {
		return rc;
	}

	while ((metadata_ptr->id != EVLOG_INVALID_ID) &&
		(metadata_ptr->id != image_id)) {
		metadata_ptr++;
	}
	assert(metadata_ptr->id != EVLOG_INVALID_ID);

	event_log_record(hash_data, EV_POST_CODE, metadata_ptr);

	/* Dump Event Log for user view */
	dump_event_log((uint8_t *)event_log, event_log_get_cur_size(event_log));

	return rc;
}