60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2012 Fergus Noble <fergusnoble@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef LIBOPENCM3_CM3_SYNC_H
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#define LIBOPENCM3_CM3_SYNC_H
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#include "common.h"
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BEGIN_DECLS
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void __dmb(void);
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/* Implements synchronisation primitives as discussed in the ARM document
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* DHT0008A (ID081709) "ARM Synchronization Primitives" and the ARM v7-M
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* Architecture Reference Manual.
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*/
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/* --- Exclusive load and store instructions ------------------------------- */
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/* Those are defined only on CM3 or CM4 */
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#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
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uint32_t __ldrex(volatile uint32_t *addr);
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uint32_t __strex(uint32_t val, volatile uint32_t *addr);
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/* --- Convenience functions ----------------------------------------------- */
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/* Here we implement some simple synchronisation primitives. */
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typedef uint32_t mutex_t;
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#define MUTEX_UNLOCKED 0
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#define MUTEX_LOCKED 1
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void mutex_lock(mutex_t *m);
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uint32_t mutex_trylock(mutex_t *m);
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void mutex_unlock(mutex_t *m);
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#endif
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END_DECLS
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#endif
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