RIOT/cpu/cortex-m3_common/irq_arch.c

/*
 * Copyright (C) 2014 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.
 */

/**
 * @ingroup     cpu_cortex-m3
 * @{
 *
 * @file        irq_arch.c
 * @brief       Implementation of the kernels irq interface
 *
 * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
 *
 * @}
 */

#include <stdint.h>
#include "arch/irq_arch.h"
#include "cpu.h"

/**
 * @brief Disable all maskable interrupts
 */
unsigned int irq_arch_disable(void)
{
    uint32_t mask = __get_PRIMASK();
    __disable_irq();
    return mask;
}

/**
 * @brief Enable all maskable interrupts
 */
unsigned int irq_arch_enable(void)
{
    __enable_irq();
    return __get_PRIMASK();
}

/**
 * @brief Restore the state of the IRQ flags
 */
void irq_arch_restore(unsigned int state)
{
    __set_PRIMASK(state);
}

/**
 * @brief See if the current context is inside an ISR
 */
int irq_arch_in(void)
{
    return (__get_IPSR() & 0xFF);
}