/*
 * Copyright (c) 2014, ARM Limited. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdint.h>
#include <smc.h>
#include <tftf.h>
#include <trusted_os.h>
#include <uuid_utils.h>

unsigned int is_trusted_os_present(uuid_t *tos_uuid)
{
	smc64_args tos_uid_args = { TOS_UID };
	smc64_ret_values ret;
	uint32_t *tos_uuid32;

	ret = tftf_smc64(&tos_uid_args);

	if ((ret.ret0 == SMC_UNKNOWN) ||
	    ((ret.ret0 == 0) && (ret.ret1 == 0) && (ret.ret2 == 0) &&
	     (ret.ret3 == 0)))
		return 0;

	tos_uuid32 = (uint32_t *) tos_uuid;
	tos_uuid32[0] = ret.ret0;
	tos_uuid32[1] = ret.ret1;
	tos_uuid32[2] = ret.ret2;
	tos_uuid32[3] = ret.ret3;

	return 1;
}