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/*
* Copyright (C) 2014 Freie Universitรคt Berlin, Hinnerk van Bruinehsen
*
* 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_atmega_common
* @{
*
* @file
* @brief Implementation of the kernels irq interface
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Hinnerk van Bruinehsen <h.v.bruinehsen@fu-berlin.de>
*
* @}
*/
#include <stdint.h>
#include <stdio.h>
#include "arch/irq_arch.h"
#include "cpu.h"
/**
* @brief Macro returns state of the global interrupt register
*/
static uint8_t __get_interrupt_state(void);
static void __set_interrupt_state(uint8_t state);
volatile uint8_t __in_isr = 0;
__attribute__((always_inline)) static inline uint8_t __get_interrupt_state(void)
{
uint8_t sreg;
__asm__ volatile("in r0, __SREG__; \n\t"
"mov %0, r0 \n\t"
: "=g"(sreg)
:
: "r0");
return sreg & (1 << 7);
}
__attribute__((always_inline)) inline void __set_interrupt_state(uint8_t state)
{
__asm__ volatile("mov r15,%0; \n\t"
"in r16, __SREG__; \n\t"
"cbr r16,7; \n\t"
"or r15,r16; \n\t"
"out __SREG__, r15 \n\t"
:
: "g"(state)
: "r15", "r16");
}
/**
* @brief Disable all maskable interrupts
*/
unsigned int irq_arch_disable(void)
{
uint8_t mask = __get_interrupt_state();
cli();
return (unsigned int) mask;
}
/**
* @brief Enable all maskable interrupts
*/
unsigned int irq_arch_enable(void)
{
sei();
return __get_interrupt_state();
}
/**
* @brief Restore the state of the IRQ flags
*/
void irq_arch_restore(unsigned int state)
{
__set_interrupt_state(state);
}
/**
* @brief See if the current context is inside an ISR
*/
int irq_arch_in(void)
{
return __in_isr;
}
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