mbed_sdk_boot.c

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2017 ARM Limited
00003  * SPDX-License-Identifier: Apache-2.0
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License");
00006  * you may not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  *     http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS,
00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 
00018 #include "mbed_toolchain.h"
00019 #include <stdlib.h>
00020 #include <stdint.h>
00021 #include "cmsis.h"
00022 
00023 /* This startup is for mbed 2 baremetal. There is no config for RTOS for mbed 2,
00024  * therefore we protect this file with MBED_CONF_RTOS_PRESENT
00025  * Note: The new consolidated started for mbed OS is in rtos/mbed_boot code file.
00026  */
00027 #if !defined(MBED_CONF_RTOS_PRESENT)
00028 
00029 /* mbed_main is a function that is called before main()
00030  * mbed_sdk_init() is also a function that is called before main(), but unlike
00031  * mbed_main(), it is not meant for user code, but for the SDK itself to perform
00032  * initializations before main() is called.
00033  */
00034 MBED_WEAK void mbed_main(void)
00035 {
00036 
00037 }
00038 
00039 /* This function can be implemented by the target to perform higher level target initialization
00040  */
00041 MBED_WEAK void mbed_sdk_init(void)
00042 {
00043 
00044 }
00045 
00046 MBED_WEAK void software_init_hook_rtos()
00047 {
00048     // Nothing by default
00049 }
00050 
00051 void mbed_copy_nvic(void)
00052 {
00053     /* If vector address in RAM is defined, copy and switch to dynamic vectors. Exceptions for M0 which doesn't have
00054     VTOR register and for A9 for which CMSIS doesn't define NVIC_SetVector; in both cases target code is
00055     responsible for correctly handling the vectors.
00056     */
00057 #if !defined(__CORTEX_M0) && !defined(__CORTEX_A9)
00058 #ifdef NVIC_RAM_VECTOR_ADDRESS
00059     uint32_t *old_vectors = (uint32_t *)SCB->VTOR;
00060     uint32_t *vectors = (uint32_t *)NVIC_RAM_VECTOR_ADDRESS;
00061     for (int i = 0; i < NVIC_NUM_VECTORS; i++) {
00062         vectors[i] = old_vectors[i];
00063     }
00064     SCB->VTOR = (uint32_t)NVIC_RAM_VECTOR_ADDRESS;
00065 #endif /* NVIC_RAM_VECTOR_ADDRESS */
00066 #endif /* !defined(__CORTEX_M0) && !defined(__CORTEX_A9) */
00067 }
00068 
00069 /* Toolchain specific main code */
00070 
00071 #if defined (__CC_ARM) || (defined(__ARMCC_VERSION) && (__ARMCC_VERSION >= 5010060))
00072 
00073 int $Super$$main(void);
00074 
00075 int $Sub$$main(void)
00076 {
00077     mbed_main();
00078     return $Super$$main();
00079 }
00080 
00081 void _platform_post_stackheap_init(void)
00082 {
00083     mbed_copy_nvic();
00084     mbed_sdk_init();
00085 }
00086 
00087 #elif defined (__GNUC__)
00088 
00089 extern int __real_main(void);
00090 
00091 void software_init_hook(void)
00092 {
00093     mbed_copy_nvic();
00094     mbed_sdk_init();
00095     software_init_hook_rtos();
00096 }
00097 
00098 
00099 int __wrap_main(void)
00100 {
00101     mbed_main();
00102     return __real_main();
00103 }
00104 
00105 #elif defined (__ICCARM__)
00106 
00107 int __low_level_init(void)
00108 {
00109     mbed_copy_nvic();
00110     return 1;
00111 }
00112 
00113 #endif
00114 
00115 #endif