Import Mbed OS hard-float snapshot

targets/TARGET_GigaDevice/TARGET_GD32F4XX/mbed_overrides.c

@@ -0,0 +1,62 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2018 GigaDevice Semiconductor Inc.
+ *
+ * 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 "gd32f4xx.h"
+#include "cmsis.h"
+#include "hal_tick.h"
+
+int mbed_sdk_inited = 0;
+
+#if TICKER_TIMER_WIDTH_BIT == 16
+extern void ticker_16bits_timer_init(void);
+#else
+extern void ticker_32bits_timer_init(void);
+#endif
+
+/**
+ * SDK hook for running code before ctors or OS
+ *
+ * This is a weak function which can be overridden by a target's
+ * SDK to allow code to run after ram is initialized but before
+ * the OS has been started or constructors have run.
+ *
+ * Preconditions:
+ * - Ram is initialized
+ * - NVIC is setup
+ */
+/**
+ * This function is called after RAM initialization and before main.
+ */
+void mbed_sdk_init()
+{
+    /* Update the SystemCoreClock */
+    SystemCoreClockUpdate();
+    nvic_priority_group_set(NVIC_PRIGROUP_PRE4_SUB0);
+
+    /* configure 1ms tick */
+#if TICKER_TIMER_WIDTH_BIT == 16
+    ticker_16bits_timer_init();
+#else
+    ticker_32bits_timer_init();
+#endif
+
+    SystemInit();
+
+    SystemCoreClockUpdate();
+
+    mbed_sdk_inited = 1;
+}