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