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https://github.com/zephyrproject-rtos/zephyr
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5b9378ab7e
Used by ARC, ARM, Nios II. x86 has alternate code done in assembly. Linker scripts had some alarming comments about data/BSS overlap, but the beginning of BSS is aligned so this can't happen even if the end of data isn't. The common code doesn't use fake pointer values for the number of words in these sections, don't compute or export them. Change-Id: I4291c2a6d0222d0a3e95c140deae7539ebab3cc3 Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/*
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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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#include <nano_private.h>
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#include <nano_internal.h>
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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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_bss_zero();
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#ifdef CONFIG_XIP
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_data_copy();
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/* In most XIP scenarios we copy the exception code into RAM, so need
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* to flush instruction cache.
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*/
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_nios2_icache_flush_all();
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#if NIOS2_ICACHE_SIZE > 0
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/* Only need to flush the data cache here if there actually is an
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* instruction cache, so that the cached instruction data written is
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* actually committed.
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*/
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_nios2_dcache_flush_all();
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#endif
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#endif
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_Cstart();
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CODE_UNREACHABLE;
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}
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