startup.c

Mike057

Jun 8th, 2025

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/*
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/**
* @page misra_violations MISRA-C:2012 violations
*
* @section [global]
* Violates MISRA 2012 Advisory Rule 8.9, An object should be defined at block
* scope if its identifier only appears in a single function.
* All variables with this problem are defined in the linker files.
*
* @section [global]
* Violates MISRA 2012 Advisory Rule 8.11, When an array with external linkage
* is declared, its size should be explicitly specified.
* The size of the arrays can not be explicitly determined.
*
* @section [global]
* Violates MISRA 2012 Advisory Rule 11.4, A conversion should not be performed
* between a pointer to object and an integer type.
* The cast is required to initialize a pointer with an unsigned int define,
* representing an address.
*
* @section [global]
* Violates MISRA 2012 Required Rule 11.6, A cast shall not be performed
* between pointer to void and an arithmetic type.
* The cast is required to initialize a pointer with an unsigned int define,
* representing an address.
*
* @section [global]
* Violates MISRA 2012 Required Rule 2.1, A project shall not contain unreachable
* code.
* The condition compares two address defined in linker files that can be different.
*
* @section [global]
* Violates MISRA 2012 Advisory Rule 8.7, External could be made static.
* Function is defined for usage by application code.
*
* @section [global]
* Violates MISRA 2012 Mandatory Rule 17.3, Symbol 'MFSPR' undeclared, assumed
* to return int.
* This is an e200 Power Architecture Assembly instruction used to retrieve
* the core number.
*
*/
#include "startup.h"
#include <stdint.h>
/*******************************************************************************
* Static Variables
******************************************************************************/
static volatile uint32_t * const s_vectors[NUMBER_OF_CORES] = FEATURE_INTERRUPT_INT_VECTORS;
/*******************************************************************************
* Code
******************************************************************************/
/*FUNCTION**********************************************************************
*
* Function Name : init_data_bss
* Description : Make necessary initializations for RAM.
* - Copy the vector table from ROM to RAM.
* - Copy initialized data from ROM to RAM.
* - Copy code that should reside in RAM from ROM
* - Clear the zero-initialized data section.
*
* Tool Chains:
* __GNUC__ : GNU Compiler Collection
* __ghs__ : Green Hills ARM Compiler
* __ICCARM__ : IAR ARM Compiler
* __DCC__ : Wind River Diab Compiler
* __ARMCC_VERSION : ARMC Compiler
*
* Implements : init_data_bss_Activity
*END**************************************************************************/
void init_data_bss(void)
{
uint32_t n;
uint8_t coreId;
/* For ARMC we are using the library method of initializing DATA, Custom Section and
* Code RAM sections so the below variables are not needed */
#if !defined(__ARMCC_VERSION)
/* Declare pointers for various data sections. These pointers
* are initialized using values pulled in from the linker file */
uint8_t * data_ram;
uint8_t * code_ram;
uint8_t * bss_start;
uint8_t * custom_ram;
const uint8_t * data_rom, * data_rom_end;
const uint8_t * code_rom, * code_rom_end;
const uint8_t * bss_end;
const uint8_t * custom_rom, * custom_rom_end;
#endif
/* Addresses for VECTOR_TABLE and VECTOR_RAM come from the linker file */
#if defined(__ARMCC_VERSION)
extern uint32_t __RAM_VECTOR_TABLE_SIZE;
extern uint32_t __VECTOR_ROM;
extern uint32_t __VECTOR_RAM;
#else
extern uint32_t __RAM_VECTOR_TABLE_SIZE[];
extern uint32_t __VECTOR_TABLE[];
extern uint32_t __VECTOR_RAM[];
#endif
/* Get section information from linker files */
#if defined(__ICCARM__)
/* Data */
data_ram = __section_begin(".data");
data_rom = __section_begin(".data_init");
data_rom_end = __section_end(".data_init");
/* CODE RAM */
#pragma section = "__CODE_ROM"
#pragma section = "__CODE_RAM"
code_ram = __section_begin("__CODE_RAM");
code_rom = __section_begin("__CODE_ROM");
code_rom_end = __section_end("__CODE_ROM");
/* BSS */
bss_start = __section_begin(".bss");
bss_end = __section_end(".bss");
custom_ram = __section_begin(".customSection");
custom_rom = __section_begin(".customSection_init");
custom_rom_end = __section_end(".customSection_init");
#elif defined (__ARMCC_VERSION)
/* VECTOR TABLE*/
uint8_t * vector_table_size = (uint8_t *)__RAM_VECTOR_TABLE_SIZE;
uint32_t * vector_rom = (uint32_t *)__VECTOR_ROM;
uint32_t * vector_ram = (uint32_t *)__VECTOR_RAM;
#else
extern uint32_t __DATA_ROM[];
extern uint32_t __DATA_RAM[];
extern uint32_t __DATA_END[];
extern uint32_t __CODE_RAM[];
extern uint32_t __CODE_ROM[];
extern uint32_t __CODE_END[];
extern uint32_t __BSS_START[];
extern uint32_t __BSS_END[];
extern uint32_t __CUSTOM_ROM[];
extern uint32_t __CUSTOM_END[];
/* Data */
data_ram = (uint8_t *)__DATA_RAM;
data_rom = (uint8_t *)__DATA_ROM;
data_rom_end = (uint8_t *)__DATA_END;
/* CODE RAM */
code_ram = (uint8_t *)__CODE_RAM;
code_rom = (uint8_t *)__CODE_ROM;
code_rom_end = (uint8_t *)__CODE_END;
/* BSS */
bss_start = (uint8_t *)__BSS_START;
bss_end = (uint8_t *)__BSS_END;
/* Custom section */
custom_ram = CUSTOMSECTION_SECTION_START;
custom_rom = (uint8_t *)__CUSTOM_ROM;
custom_rom_end = (uint8_t *)__CUSTOM_END;
#endif
#if !defined(__ARMCC_VERSION)
/* Copy initialized data from ROM to RAM */
while (data_rom_end != data_rom)
{
*data_ram = *data_rom;
data_ram++;
data_rom++;
}
/* Copy functions from ROM to RAM */
while (code_rom_end != code_rom)
{
*code_ram = *code_rom;
code_ram++;
code_rom++;
}
/* Clear the zero-initialized data section */
while(bss_end != bss_start)
{
*bss_start = 0;
bss_start++;
}
/* Copy customsection rom to ram */
while(custom_rom_end != custom_rom)
{
*custom_ram = *custom_rom;
custom_rom++;
custom_ram++;
}
#endif
coreId = (uint8_t)GET_CORE_ID();
#if defined (__ARMCC_VERSION)
/* Copy the vector table from ROM to RAM */
/* Workaround */
for (n = 0; n < (((uint32_t)(vector_table_size))/sizeof(uint32_t)); n++)
{
vector_ram[n] = vector_rom[n];
}
/* Point the VTOR to the position of vector table */
*s_vectors[coreId] = (uint32_t) __VECTOR_RAM;
#else
/* Check if VECTOR_TABLE copy is needed */
if (__VECTOR_RAM != __VECTOR_TABLE)
{
/* Copy the vector table from ROM to RAM */
for (n = 0; n < (((uint32_t)__RAM_VECTOR_TABLE_SIZE)/sizeof(uint32_t)); n++)
{
__VECTOR_RAM[n] = __VECTOR_TABLE[n];
}
/* Point the VTOR to the position of vector table */
*s_vectors[coreId] = (uint32_t)__VECTOR_RAM;
}
else
{
/* Point the VTOR to the position of vector table */
*s_vectors[coreId] = (uint32_t)__VECTOR_TABLE;
}
#endif
}
/*******************************************************************************
* EOF
******************************************************************************/

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