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/*
* Copyright (c) 2013 - 2014, Freescale Semiconductor, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "startup.h"
#include "fsl_device_registers.h"
#if (defined(__ICCARM__))
#pragma section = ".data"
#pragma section = ".data_init"
#pragma section = ".bss"
#endif
/*******************************************************************************
* Code
******************************************************************************/
/*FUNCTION**********************************************************************
*
* Function Name : init_data_bss
* Description : Make necessary initializations for RAM.
* - Copy initialized data from ROM to RAM.
* - Clear the zero-initialized data section.
* - Copy the vector table from ROM to RAM. This could be an option.
*
* Tool Chians:
* __GNUC__ : GCC
* __CC_ARM : KEIL
* __ICCARM__ : IAR
*
*END**************************************************************************/
void init_data_bss(void)
{
uint32_t n;
/* Addresses for VECTOR_TABLE and VECTOR_RAM come from the linker file */
#if defined(__CC_ARM)
extern uint32_t Image$$VECTOR_ROM$$Base[];
extern uint32_t Image$$VECTOR_RAM$$Base[];
extern uint32_t Image$$RW_m_data$$Base[];
#define __VECTOR_TABLE Image$$VECTOR_ROM$$Base
#define __VECTOR_RAM Image$$VECTOR_RAM$$Base
#define __RAM_VECTOR_TABLE_SIZE (((uint32_t)Image$$RW_m_data$$Base - (uint32_t)Image$$VECTOR_RAM$$Base))
#elif defined(__ICCARM__)
extern uint32_t __RAM_VECTOR_TABLE_SIZE[];
extern uint32_t __VECTOR_TABLE[];
extern uint32_t __VECTOR_RAM[];
#elif defined(__GNUC__)
extern uint32_t __VECTOR_TABLE[];
extern uint32_t __VECTOR_RAM[];
extern uint32_t __RAM_VECTOR_TABLE_SIZE_BYTES[];
uint32_t __RAM_VECTOR_TABLE_SIZE = (uint32_t)(__RAM_VECTOR_TABLE_SIZE_BYTES);
#endif
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 */
SCB->VTOR = (uint32_t)__VECTOR_RAM;
}
else
{
/* Point the VTOR to the position of vector table */
SCB->VTOR = (uint32_t)__VECTOR_TABLE;
}
#if !defined(__CC_ARM) && !defined(__ICCARM__)
/* Declare pointers for various data sections. These pointers
* are initialized using values pulled in from the linker file */
uint8_t * data_ram, * data_rom, * data_rom_end;
uint8_t * bss_start, * bss_end;
/* Get the addresses for the .data section (initialized data section) */
#if defined(__GNUC__)
extern uint32_t __DATA_ROM[];
extern uint32_t __DATA_RAM[];
extern char __DATA_END[];
data_ram = (uint8_t *)__DATA_RAM;
data_rom = (uint8_t *)__DATA_ROM;
data_rom_end = (uint8_t *)__DATA_END;
n = data_rom_end - data_rom;
#endif
/* Copy initialized data from ROM to RAM */
while (n--)
{
*data_ram++ = *data_rom++;
}
/* Get the addresses for the .bss section (zero-initialized data) */
#if defined(__GNUC__)
extern char __START_BSS[];
extern char __END_BSS[];
bss_start = (uint8_t *)__START_BSS;
bss_end = (uint8_t *)__END_BSS;
#endif
/* Clear the zero-initialized data section */
n = bss_end - bss_start;
while(n--)
{
*bss_start++ = 0;
}
#endif /* !__CC_ARM && !__ICCARM__*/
}
/*******************************************************************************
* EOF
******************************************************************************/
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