Import Mbed OS hard-float snapshot

targets/TARGET_Cypress/TARGET_PSOC6/cy_trng_api.c

@@ -0,0 +1,71 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2019, Arm Limited and affiliates.
+ * 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 "trng_api.h"
+#include "cyhal_trng.h"
+#include "mbed_error.h"
+#include <string.h>
+
+#if DEVICE_TRNG
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void trng_init(trng_t *obj)
+{
+    if (CY_RSLT_SUCCESS != cyhal_trng_init(&(obj->trng))) {
+        MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_FAILED_OPERATION), "cyhal_trng_init");
+    }
+}
+
+void trng_free(trng_t *obj)
+{
+    cyhal_trng_free(&(obj->trng));
+}
+
+int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
+{
+    uint32_t offset = 0;
+    // If output is not word-aligned, write partial word
+    uint32_t prealign = (uint32_t)((uintptr_t)output % sizeof(uint32_t));
+    if (prealign != 0) {
+        uint32_t value = cyhal_trng_generate(&(obj->trng));
+        uint32_t count = sizeof(uint32_t) - prealign;
+        memmove(&output[0], &value, count);
+        offset += count;
+    }
+    // Write aligned full words
+    for (; offset < length - (sizeof(uint32_t) - 1u); offset += sizeof(uint32_t)) {
+        *(uint32_t *)(&output[offset]) = cyhal_trng_generate(&(obj->trng));
+    }
+    // Write partial trailing word if requested
+    if (offset < length) {
+        uint32_t value = cyhal_trng_generate(&(obj->trng));
+        uint32_t count = length - offset;
+        memmove(&output[offset], &value, count);
+        offset += count;
+    }
+    *output_length = offset;
+    return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif