core/arch/arm/plat-ti/sm_platform_handler_a15.c

// SPDX-License-Identifier: BSD-2-Clause
/*
 * Copyright (c) 2017, Texas Instruments
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 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 <arm32.h>
#include <kernel/thread.h>
#include <sm/optee_smc.h>
#include <sm/sm.h>
#include <trace.h>

#include "api_monitor_index_a15.h"

static enum sm_handler_ret ti_sip_handler(struct thread_smc_args *smc_args)
{
	uint16_t sip_func = OPTEE_SMC_FUNC_NUM(smc_args->a0);

	switch (sip_func) {
	case API_MONITOR_ACTLR_SETREGISTER_INDEX:
		write_actlr(smc_args->a1);
		isb();
		smc_args->a0 = OPTEE_SMC_RETURN_OK;
		break;
	case API_MONITOR_TIMER_SETCNTFRQ_INDEX:
		write_cntfrq(smc_args->a1);
		isb();
		smc_args->a0 = OPTEE_SMC_RETURN_OK;
		break;
	default:
		EMSG("Invalid SIP function code: 0x%04"PRIx16, sip_func);
		smc_args->a0 = OPTEE_SMC_RETURN_EBADCMD;
		break;
	}

	return SM_HANDLER_SMC_HANDLED;
}

enum sm_handler_ret sm_platform_handler(struct sm_ctx *ctx)
{
	uint32_t *nsec_r0 = (uint32_t *)(&ctx->nsec.r0);
	uint16_t smc_owner = OPTEE_SMC_OWNER_NUM(*nsec_r0);

	switch (smc_owner) {
	case OPTEE_SMC_OWNER_SIP:
		return ti_sip_handler((struct thread_smc_args *)nsec_r0);
	default:
		return SM_HANDLER_PENDING_SMC;
	}
}