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() */
main(void)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