critical.h

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/*
 * This file is part of MCU-Common.
 *
 * Copyright (C) 2017 Adam Heinrich <adam@adamh.cz>
 *
 * MCU-Common 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 3 of the License, or
 * (at your option) any later version.
 *
 * MCU-Common 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 MCU-Common.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, the copyright holders of this library give
 * you permission to link this library with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also meet,
 * for each linked independent module, the terms and conditions of the
 * license of that module.  An independent module is a module which is
 * not derived from or based on this library.  If you modify this
 * library, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish to
 * do so, delete this exception statement from your version.
 */
 
#ifndef MCU_COMMON_CRITICAL_H
#define MCU_COMMON_CRITICAL_H
 
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#if defined(__ARM_ARCH_6M__) || defined(__ARM_ARCH_7M__) || \
    defined(__ARM_ARCH_7EM__)
 
#define CRITICAL_ENTER() \
        do { \
                uint32_t _prm; \
                __asm__ volatile ("mrs %0, primask" : "=r" (_prm)); \
                __asm__ volatile ("cpsid i" ::: "memory")
 
#define CRITICAL_EXIT() \
                __asm__ volatile ("msr primask, %0" :: "r" (_prm) : "memory"); \
        } while(0)
 
#else
 
#pragma message "Using empty stubs for CRITICAL_*() macros. "\
                "Please define them for your architecture."
 
#define CRITICAL_ENTER()        do {
#define CRITICAL_EXIT()         } while(0)
 
#endif
 
#ifdef __cplusplus
}
#endif
 
#endif /* MCU_COMMON_CRITICAL_H */