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  1. /******************************************************************************
  2.  * @file     main_s.c
  3.  * @brief    Code template for secure main function
  4.  * @version  V1.1.1
  5.  * @date     10. January 2018
  6.  ******************************************************************************/
  7. /*
  8.  * Copyright (c) 2013-2018 Arm Limited. All rights reserved.
  9.  *
  10.  * SPDX-License-Identifier: Apache-2.0
  11.  *
  12.  * Licensed under the Apache License, Version 2.0 (the License); you may
  13.  * not use this file except in compliance with the License.
  14.  * You may obtain a copy of the License at
  15.  *
  16.  * www.apache.org/licenses/LICENSE-2.0
  17.  *
  18.  * Unless required by applicable law or agreed to in writing, software
  19.  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
  20.  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  21.  * See the License for the specific language governing permissions and
  22.  * limitations under the License.
  23.  */
  24.  
  25. /* Use CMSE intrinsics */
  26. #include <arm_cmse.h>
  27.  
  28. #include "RTE_Components.h"
  29. #include CMSIS_device_header
  30.  
  31. /* TZ_START_NS: Start address of non-secure application */
  32. #ifndef TZ_START_NS
  33. #define TZ_START_NS (0x200000U)
  34. #endif
  35.  
  36. /* typedef for non-secure callback functions */
  37. typedef void (*funcptr_void) (void) __attribute__((cmse_nonsecure_call));
  38.  
  39. /* Secure main() */
  40. int main(void) {
  41.   funcptr_void NonSecure_ResetHandler;
  42.  
  43.   /* Add user setup code for secure part here*/
  44.  
  45.   /* Set non-secure main stack (MSP_NS) */
  46.   __TZ_set_MSP_NS(*((uint32_t *)(TZ_START_NS)));
  47.  
  48.   /* Get non-secure reset handler */
  49.   NonSecure_ResetHandler = (funcptr_void)(*((uint32_t *)((TZ_START_NS) + 4U)));
  50.  
  51.   /* Start non-secure state software application */
  52.   NonSecure_ResetHandler();
  53.  
  54.   /* Non-secure software does not return, this code is not executed */
  55.   while (1) {
  56.     __NOP();
  57.   }
  58. }
  59.