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/*
* Copyright (c) 2013-2014 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief NMI handler infrastructure
*
* Provides a boot time handler that simply hangs in a sleep loop, and a run
* time handler that resets the CPU. Also provides a mechanism for hooking a
* custom run time handler.
*/
#include <kernel.h>
#include <arch/cpu.h>
#include <misc/printk.h>
#include <misc/reboot.h>
#include <toolchain.h>
#include <sections.h>
extern void _SysNmiOnReset(void);
#if !defined(CONFIG_RUNTIME_NMI)
#define handler _SysNmiOnReset
#endif
#ifdef CONFIG_RUNTIME_NMI
typedef void (*_NmiHandler_t)(void);
static _NmiHandler_t handler = _SysNmiOnReset;
/**
*
* @brief Default NMI handler installed when kernel is up
*
* The default handler outputs a error message and reboots the target. It is
* installed by calling _NmiInit();
*
* @return N/A
*/
static void _DefaultHandler(void)
{
printk("NMI received! Rebooting...\n");
/* In ARM implementation sys_reboot ignores the parameter */
sys_reboot(0);
}
/**
*
* @brief Install default runtime NMI handler
*
* Meant to be called by platform code if they want to install a simple NMI
* handler that reboots the target. It should be installed after the console is
* initialized.
*
* @return N/A
*/
void _NmiInit(void)
{
handler = _DefaultHandler;
}
/**
*
* @brief Install a custom runtime NMI handler
*
* Meant to be called by platform code if they want to install a custom NMI
* handler that reboots. It should be installed after the console is
* initialized if it is meant to output to the console.
*
* @return N/A
*/
void _NmiHandlerSet(void (*pHandler)(void))
{
handler = pHandler;
}
#endif /* CONFIG_RUNTIME_NMI */
/**
*
* @brief Handler installed in the vector table
*
* Simply call what is installed in 'static void(*handler)(void)'.
*
* @return N/A
*/
void __nmi(void)
{
handler();
_ExcExit();
}
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