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73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//! Initial firmware startup, contains the vector table that the bootloader loads.
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//! Based on "https://github.com/pfalcon/cortex-uni-startup/blob/master/startup.c"
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//! by Paul Sokolovsky (public domain)
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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#include "mcu/cache.h"
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#include "util/attributes.h"
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//! These symbols are defined in the linker script for use in initializing
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//! the data sections. uint8_t since we do arithmetic with section lengths.
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//! These are arrays to avoid the need for an & when dealing with linker symbols.
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extern uint8_t __data_load_start[];
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extern uint8_t __data_start[];
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extern uint8_t __data_end[];
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extern uint8_t __bss_start[];
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extern uint8_t __bss_end[];
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extern uint8_t _estack[];
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#if MICRO_FAMILY_STM32F7
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extern uint8_t __dtcm_bss_start[];
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extern uint8_t __dtcm_bss_end[];
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#endif
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//! Firmware main function, ResetHandler calls this
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extern int main(void);
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//! STM32 system initialization function, defined in the standard peripheral library
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extern void SystemInit(void);
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//! This function is what gets called when the processor first
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//! starts execution following a reset event. The data and bss
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//! sections are initialized, then we call the firmware's main
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//! function
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NORETURN Reset_Handler(void) {
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// Copy data section from flash to RAM
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memcpy(__data_start, __data_load_start, __data_end - __data_start);
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// Clear the bss section, assumes .bss goes directly after .data
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memset(__bss_start, 0, __bss_end - __bss_start);
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#if MICRO_FAMILY_STM32F7
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// Clear the DTCM bss section
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memset(__dtcm_bss_start, 0, __dtcm_bss_end - __dtcm_bss_start);
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#endif
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SystemInit();
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icache_enable();
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dcache_enable();
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main();
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// Main shouldn't return
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while (true) {}
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}
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