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path: root/core/arch/arm/tee/svc_cache.c
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/*
 * Copyright (c) 2014, STMicroelectronics International N.V.
 * Copyright (c) 2015, Linaro 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:
 *
 * 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 <kernel/tee_ta_manager.h>
#include <mm/tee_mmu.h>
#include <tee/cache.h>
#include <tee/svc_cache.h>

TEE_Result syscall_cache_operation(void *va, size_t len, unsigned long op)
{
	TEE_Result res;
	struct tee_ta_session *sess;
	struct user_ta_ctx *utc;

	res = tee_ta_get_current_session(&sess);
	if (res != TEE_SUCCESS)
		return res;

	if ((sess->ctx->flags & TA_FLAG_CACHE_MAINTENANCE) == 0)
		return TEE_ERROR_NOT_SUPPORTED;

	utc = to_user_ta_ctx(sess->ctx);

	/*
	 * TAs are allowed to operate cache maintenance on TA memref parameters
	 * only, not on the TA private memory.
	 */
	if (tee_mmu_is_vbuf_intersect_ta_private(utc, va, len))
		return TEE_ERROR_ACCESS_DENIED;

	res = tee_mmu_check_access_rights(utc, TEE_MEMORY_ACCESS_READ |
					  TEE_MEMORY_ACCESS_ANY_OWNER,
					  (uaddr_t)va, len);
	if (res != TEE_SUCCESS)
		return TEE_ERROR_ACCESS_DENIED;

	return cache_operation(op, va, len);
}