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external/CMSIS_5/Device/ARM/ARMCA9/Source/system_ARMCA9.c

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+/******************************************************************************
+ * @file     system_ARMCA9.c
+ * @brief    CMSIS Device System Source File for Arm Cortex-A9 Device Series
+ * @version  V1.0.1
+ * @date     13. February 2019
+ *
+ * @note
+ *
+ ******************************************************************************/
+/*
+ * Copyright (c) 2009-2019 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
+ *
+ * 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 "RTE_Components.h"
+#include CMSIS_device_header
+#include "irq_ctrl.h"
+
+#define  SYSTEM_CLOCK  12000000U
+
+/*----------------------------------------------------------------------------
+  System Core Clock Variable
+ *----------------------------------------------------------------------------*/
+uint32_t SystemCoreClock = SYSTEM_CLOCK;
+
+/*----------------------------------------------------------------------------
+  System Core Clock update function
+ *----------------------------------------------------------------------------*/
+void SystemCoreClockUpdate (void)
+{
+  SystemCoreClock = SYSTEM_CLOCK;
+}
+
+/*----------------------------------------------------------------------------
+  System Initialization
+ *----------------------------------------------------------------------------*/
+void SystemInit (void)
+{
+/* do not use global variables because this function is called before
+   reaching pre-main. RW section may be overwritten afterwards.          */
+
+  // Invalidate entire Unified TLB
+  __set_TLBIALL(0);
+
+  // Invalidate entire branch predictor array
+  __set_BPIALL(0);
+  __DSB();
+  __ISB();
+
+  //  Invalidate instruction cache and flush branch target cache
+  __set_ICIALLU(0);
+  __DSB();
+  __ISB();
+
+  //  Invalidate data cache
+  L1C_InvalidateDCacheAll();
+
+#if ((__FPU_PRESENT == 1) && (__FPU_USED == 1))
+  // Enable FPU
+  __FPU_Enable();
+#endif
+
+  // Create Translation Table
+  MMU_CreateTranslationTable();
+
+  // Enable MMU
+  MMU_Enable();
+
+  // Enable Caches
+  L1C_EnableCaches();
+  L1C_EnableBTAC();
+
+#if (__L2C_PRESENT == 1) 
+  // Enable GIC
+  L2C_Enable();
+#endif
+
+  // IRQ Initialize
+  IRQ_Initialize();
+}