Import Mbed OS hard-float snapshot

connectivity/mbedtls/platform/src/platform_alt.cpp

@@ -0,0 +1,57 @@
+ /*
+  *  platform_alt.c
+  *
+  *  Copyright (C) 2018, Arm Limited, All Rights Reserved
+  *  SPDX-License-Identifier: Apache-2.0
+  *
+  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+  *  not use this file except in compliance with the License.
+  *  You may obtain a copy of the License at
+  *
+  *  http://www.apache.org/licenses/LICENSE-2.0
+  *
+  *  Unless required by applicable law or agreed to in writing, software
+  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  *  See the License for the specific language governing permissions and
+  *  limitations under the License.
+  *
+  */
+
+#include "mbedtls/platform.h"
+#if defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
+#include "platform/SingletonPtr.h"
+#include "platform/PlatformMutex.h"
+
+mbedtls_platform_context plat_ctx = { { 0 } };
+extern SingletonPtr<PlatformMutex> mbedtls_mutex;
+
+int mbedtls_platform_setup( mbedtls_platform_context *unused_ctx )
+{
+    int ret = 0;
+    mbedtls_mutex->lock();
+    ++plat_ctx.reference_count;
+
+    if( plat_ctx.reference_count == 1 )
+    {
+        /* call platform specific code to setup crypto driver */
+        ret = crypto_platform_setup( &plat_ctx.platform_impl_ctx );
+    }
+    mbedtls_mutex->unlock();
+    return ( ret );
+}
+
+void mbedtls_platform_teardown( mbedtls_platform_context *unused_ctx )
+{
+    mbedtls_mutex->lock();
+    --plat_ctx.reference_count;
+    if( plat_ctx.reference_count < 1 )
+    {
+        /* call platform specific code to terminate crypto driver */
+        crypto_platform_terminate( &plat_ctx.platform_impl_ctx );
+        plat_ctx.reference_count = 0;
+    }
+    mbedtls_mutex->unlock();
+}
+
+#endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT*/