72 lines
2.4 KiB
ArmAsm
72 lines
2.4 KiB
ArmAsm
/* reset.s - reset handler */
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/*
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* Copyright (c) 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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Reset handler that prepares the system for running C code.
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*/
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#define _ASMLANGUAGE
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#include <board.h>
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#include <toolchain.h>
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#include <sections.h>
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#include <nanokernel/cpu.h>
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#define _RAM_END (CONFIG_RAM_START + CONFIG_RAM_SIZE)
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GTEXT(__reset)
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/*******************************************************************************
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*
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* __reset - reset vector
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*
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* Ran when the system comes out of reset. The processor is at supervisor level.
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*
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* Locking interrupts prevents anything from interrupting the CPU.
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*
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* When these steps are completed, jump to _PrepC(), which will finish setting
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* up the system for running C code.
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*
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* RETURNS: N/A
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*/
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SECTION_FUNC(TEXT,__reset)
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/* lock interrupts: will get unlocked when switch to main task */
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clri
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/* setup a stack at the end of the RAM */
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mov sp, _RAM_END
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j @_PrepC
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