78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/*
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* Copyright (c) 2017 RnDity Sp. z o.o.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief System/hardware module for STM32F0 processor
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*/
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#include <zephyr/device.h>
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#include <zephyr/init.h>
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#include <stm32_ll_system.h>
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#include <zephyr/linker/linker-defs.h>
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#include <string.h>
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#include <cmsis_core.h>
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#if defined(CONFIG_SW_VECTOR_RELAY) || defined(CONFIG_SW_VECTOR_RELAY_CLIENT)
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extern void *_vector_table_pointer;
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#endif
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/**
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* @brief Relocate vector table to SRAM.
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*
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* On Cortex-M0 platforms, the Vector Base address cannot be changed.
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*
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* A Zephyr image that is run from the mcuboot bootloader must relocate the
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* vector table to SRAM to be able to replace the vectors pointing to the
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* bootloader.
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*
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* A zephyr image that is a bootloader does not have to relocate the
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* vector table.
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*
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* Alternatively both switches SW_VECTOR_RELAY (for Bootloader image) and
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* SW_VECTOR_RELAY_CLIENT (for image loaded by a bootloader) can be used to
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* adds a vector table relay handler and a vector relay table, to relay
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* interrupts based on a vector table pointer.
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*
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* Replaces the default function from prep_c.c.
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*
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* @note Zephyr applications that will not be loaded by a bootloader should
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* pretend to be a bootloader if the SRAM vector table is not needed.
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*/
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void relocate_vector_table(void)
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{
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#if defined(CONFIG_SW_VECTOR_RELAY) || defined(CONFIG_SW_VECTOR_RELAY_CLIENT)
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_vector_table_pointer = _vector_start;
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#elif defined(CONFIG_SRAM_VECTOR_TABLE)
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extern char _ram_vector_start[];
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size_t vector_size = (size_t)_vector_end - (size_t)_vector_start;
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memcpy(_ram_vector_start, _vector_start, vector_size);
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LL_SYSCFG_SetRemapMemory(LL_SYSCFG_REMAP_SRAM);
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#endif
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}
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/**
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* @brief Perform basic hardware initialization at boot.
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*
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* This needs to be run from the very beginning.
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* So the init priority has to be 0 (zero).
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*
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* @return 0
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*/
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static int stm32f0_init(void)
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{
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/* Update CMSIS SystemCoreClock variable (HCLK) */
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/* At reset, system core clock is set to 8 MHz from HSI */
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SystemCoreClock = 8000000;
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return 0;
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}
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SYS_INIT(stm32f0_init, PRE_KERNEL_1, 0);
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