zephyr/arch/arc/core/prep_c.c

95 lines
1.9 KiB
C

/*
* Copyright (c) 2014 Wind River Systems, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file
* @brief Full C support initialization
*
*
* Initialization of full C support: zero the .bss, copy the .data if XIP,
* call _Cstart().
*
* Stack is available in this module, but not the global data/bss until their
* initialization is performed.
*/
#include <stdint.h>
#include <toolchain.h>
#include <linker-defs.h>
/**
*
* @brief Clear BSS
*
* This routine clears the BSS region, so all bytes are 0.
*
* @return N/A
*/
static void bssZero(void)
{
volatile uint32_t *pBSS = (uint32_t *)&__bss_start;
unsigned int n;
for (n = 0; n < (unsigned int)&__bss_num_words; n++) {
pBSS[n] = 0;
}
}
/**
*
* @brief Copy the data section from ROM to RAM
*
* This routine copies the data section from ROM to RAM.
*
* @return N/A
*/
#ifdef CONFIG_XIP
static void dataCopy(void)
{
volatile uint32_t *pROM = (uint32_t *)&__data_rom_start;
volatile uint32_t *pRAM = (uint32_t *)&__data_ram_start;
unsigned int n;
for (n = 0; n < (unsigned int)&__data_num_words; n++) {
pRAM[n] = pROM[n];
}
}
#else
static void dataCopy(void)
{
}
#endif
extern FUNC_NORETURN void _Cstart(void);
/**
*
* @brief Prepare to and run C code
*
* This routine prepares for the execution of and runs C code.
*
* @return N/A
*/
void _PrepC(void)
{
bssZero();
dataCopy();
_Cstart();
CODE_UNREACHABLE;
}