platform_alt.c

00001  /*
00002   *  platform_alt.c
00003   *
00004   *  Copyright (C) 2018, Arm Limited, All Rights Reserved
00005   *  SPDX-License-Identifier: Apache-2.0
00006   *
00007   *  Licensed under the Apache License, Version 2.0 (the "License"); you may
00008   *  not use this file except in compliance with the License.
00009   *  You may obtain a copy of the License at
00010   *
00011   *  http://www.apache.org/licenses/LICENSE-2.0
00012   *
00013   *  Unless required by applicable law or agreed to in writing, software
00014   *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00015   *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00016   *  See the License for the specific language governing permissions and
00017   *  limitations under the License.
00018   *
00019   */
00020 
00021 #include "mbedtls/platform.h"
00022 #if defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
00023 #include "mbed_critical.h"
00024 
00025 mbedtls_platform_context ctx = { { 0 } };
00026 
00027 int mbedtls_platform_setup( mbedtls_platform_context *unused_ctx )
00028 {
00029     int ret = 0;
00030 
00031     core_util_atomic_incr_u32( ( volatile uint32_t * )&ctx.reference_count, 1 );
00032 
00033     if( ctx.reference_count == 1 )
00034     {
00035         /* call platform specific code to setup crypto driver */
00036         ret = crypto_platform_setup( &ctx.platform_impl_ctx );
00037     }
00038     return ( ret );
00039 }
00040 
00041 void mbedtls_platform_teardown( mbedtls_platform_context *unused_ctx )
00042 {
00043     core_util_atomic_decr_u32( ( volatile uint32_t * )&ctx.reference_count, 1 );
00044     if( ctx.reference_count < 1 )
00045     {
00046         /* call platform specific code to terminate crypto driver */
00047         crypto_platform_terminate( &ctx.platform_impl_ctx );
00048         ctx.reference_count = 0;
00049     }
00050 }
00051 
00052 #endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT*/