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/*
* 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);
}