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// ARM Cortex-M vector table and initial bootup handling
//
// Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "armcm_boot.h" // DECL_ARMCM_IRQ
#include "autoconf.h" // CONFIG_MCU
#include "board/internal.h" // SystemInit
#include "command.h" // DECL_CONSTANT_STR
// Export MCU type
DECL_CONSTANT_STR("MCU", CONFIG_MCU);
// Symbols created by armcm_link.lds.S linker script
extern uint32_t _data_start, _data_end, _data_flash;
extern uint32_t _bss_start, _bss_end, _stack_start;
/****************************************************************
* Basic interrupt handlers
****************************************************************/
// Initial code entry point - invoked by the processor after a reset
void
ResetHandler(void)
{
// Copy global variables from flash to ram
uint32_t count = (&_data_end - &_data_start) * 4;
__builtin_memcpy(&_data_start, &_data_flash, count);
// Clear the bss segment
__builtin_memset(&_bss_start, 0, (&_bss_end - &_bss_start) * 4);
barrier();
// Initializing the C library isn't needed...
//__libc_init_array();
// Initialize the machine
SystemInit();
// Run the main code
extern int main(void);
main();
// The main() call should not return
for (;;)
;
}
DECL_ARMCM_IRQ(ResetHandler, -15);
// Code called for any undefined interrupts
void
DefaultHandler(void)
{
for (;;)
;
}
/****************************************************************
* Dynamic memory range
****************************************************************/
// Return the start of memory available for dynamic allocations
void *
dynmem_start(void)
{
return &_bss_end;
}
// Return the end of memory available for dynamic allocations
void *
dynmem_end(void)
{
return &_stack_start;
}
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