83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/* ctors.c - constructor module for BSPs */
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/*
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* Copyright (c) 2012-2014 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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DESCRIPTION
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This module provides the C++ style constructor machanism used by various
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components to initialize themselves automatically. They do this by including
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a tag of the form NANO_INIT_xxx in the declaration of the init function;
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these tags are defined in nanokernel.h. The _xxx portion of the tag indicates
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the priority of the associated constructor, allowing them to execute in a
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deterministic order.
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The _Ctors() routine is called from a BSP's _Cstart() routine after hardware
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initialization has completed.
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Although ctors are traditionally a C++ feature, normal C code can use them too.
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No destructor support (dtors) is provided.
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*/
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/* What a constructor function pointer looks like */
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typedef void (*CtorFuncPtr)(void);
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/*
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* The list of constructor function pointers.
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*
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* Generated by the linker script, and ordered from highest numbered priority
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* ("do last") to lowest numbered priority ("do first"). List element 0 is the
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* number of constructors that follow (N); list element N+1 is NULL.
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*/
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extern CtorFuncPtr __CTOR_LIST__[];
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extern CtorFuncPtr __CTOR_END__[];
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/**
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*
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* @brief Invoke all C++ style global object constructors
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*
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* This function is invoked by _Cstart(), which is implemented in the BSP. It
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* invokes all routines that have been tagged using NANO_INIT_xxx, in order
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* of priority (i.e. lowest numbered to highest numbered).
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*/
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void _Ctors(void)
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{
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unsigned int nCtors;
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nCtors = (unsigned int)__CTOR_LIST__[0];
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while (nCtors >= 1) {
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__CTOR_LIST__[nCtors--]();
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}
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}
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