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/*
* File : irq.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2006-02-24 Bernard first version
* 2006-05-03 Bernard add IRQ_DEBUG
*/
#include <rthw.h>
#include <rtthread.h>
/* #define IRQ_DEBUG */
/**
* @addtogroup Kernel
*/
/*@{*/
volatile rt_uint8_t rt_interrupt_nest;
/**
* This function will be invoked by BSP, when enter interrupt service routine
*
* @note please don't invoke this routine in application
*
* @see rt_interrupt_leave
*/
void rt_interrupt_enter(void)
{
rt_base_t level;
RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq coming..., irq nest:%d\n",
rt_interrupt_nest));
level = rt_hw_interrupt_disable();
rt_interrupt_nest ++;
rt_hw_interrupt_enable(level);
}
RTM_EXPORT(rt_interrupt_enter);
/**
* This function will be invoked by BSP, when leave interrupt service routine
*
* @note please don't invoke this routine in application
*
* @see rt_interrupt_enter
*/
void rt_interrupt_leave(void)
{
rt_base_t level;
RT_DEBUG_LOG(RT_DEBUG_IRQ, ("irq leave, irq nest:%d\n",
rt_interrupt_nest));
level = rt_hw_interrupt_disable();
rt_interrupt_nest --;
rt_hw_interrupt_enable(level);
}
RTM_EXPORT(rt_interrupt_leave);
/**
* This function will return the nest of interrupt.
*
* User application can invoke this function to get whether current
* context is interrupt context.
*
* @return the number of nested interrupts.
*/
rt_uint8_t rt_interrupt_get_nest(void)
{
return rt_interrupt_nest;
}
RTM_EXPORT(rt_interrupt_get_nest);
RTM_EXPORT(rt_hw_interrupt_disable);
RTM_EXPORT(rt_hw_interrupt_enable);
/*@}*/
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