118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/* nmi.c - NMI handler infrastructure */
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/*
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* Copyright (c) 2013-2014 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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Provides a boot time handler that simply hangs in a sleep loop, and a run time
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handler that resets the CPU. Also provides a mechanism for hooking a custom
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run time handler.
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*/
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#include <nanokernel.h>
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#include <nanokernel/cpu.h>
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#include <misc/printk.h>
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#include <toolchain.h>
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#include <sections.h>
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extern void _SysNmiOnReset(void);
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#if !defined(CONFIG_RUNTIME_NMI)
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#define handler _SysNmiOnReset
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#endif
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#ifdef CONFIG_RUNTIME_NMI
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typedef void (*_NmiHandler_t)(void);
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static handler = _SysNmiOnReset;
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/*******************************************************************************
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*
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* _DefaultHandler - default NMI handler installed when kernel is up
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*
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* The default handler outputs a error message and reboots the target. It is
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* installed by calling _NmiInit();
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*
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* RETURNS: N/A
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*/
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static void _DefaultHandler(void)
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{
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printk("NMI received! Rebooting...\n");
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_ScbSystemReset();
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}
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/*******************************************************************************
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*
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* _NmiInit - install default runtime NMI handler
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*
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* Meant to be called by BSP code if they want to install a simple NMI handler
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* that reboots the target. It should be installed after the console is
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* initialized.
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*
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* RETURNS: N/A
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*/
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void _NmiInit(void)
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{
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handler = _DefaultHandler;
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}
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/*******************************************************************************
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*
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* _NmiHandlerSet - install a custom runtime NMI handler
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*
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* Meant to be called by BSP code if they want to install a custom NMI handler
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* that reboots. It should be installed after the console is initialized if it is
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* meant to output to the console.
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*
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* RETURNS: N/A
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*/
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void _NmiHandlerSet(void (*pHandler)(void))
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{
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handler = pHandler;
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}
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#endif /* CONFIG_RUNTIME_NMI */
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/*******************************************************************************
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*
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* __nmi - handler installed in the vector table
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*
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* Simply call what is installed in 'static void(*handler)(void)'.
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*
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* RETURNS: N/A
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*/
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void __nmi(void)
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{
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handler();
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_ExcExit();
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}
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