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/*
* Copyright (C) 2013 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup core_irq IRQ Handling
* @ingroup core
* @brief Provides an API to control interrupt processing
* @{
*
* @file
* @brief IRQ driver interface
*
* @author Freie Universität Berlin, Computer Systems & Telematics
*/
#ifndef IRQ_H
#define IRQ_H
#include <stdbool.h>
#include "arch/irq_arch.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief This function sets the IRQ disable bit in the status register
*
* @return Previous value of status register. The return value should not
* interpreted as a boolean value. The actual value is only
* significant for irq_restore().
*
* @see irq_restore
*/
unsigned irq_disable(void);
/**
* @brief This function clears the IRQ disable bit in the status register
*
* @return Previous value of status register. The return value should not
* interpreted as a boolean value. The actual value is only
* significant for irq_restore().
*
* @see irq_restore
*/
unsigned irq_enable(void);
/**
* @brief This function restores the IRQ disable bit in the status register
* to the value contained within passed state
*
* @param[in] state state to restore
*
* @see irq_enable
* @see irq_disable
*/
void irq_restore(unsigned state);
/**
* @brief Check whether called from interrupt service routine
* @return true, if in interrupt service routine, false if not
*/
int irq_is_in(void);
#ifdef __cplusplus
}
#endif
#endif /* IRQ_H */
/** @} */