56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
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* Copyright 2024 Great Scott Gadgets <info@greatscottgadgets.com>
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*
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* This file is part of HackRF.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __LOCKING_H__
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#define __LOCKING_H__
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#include <stdint.h>
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#include <libopencm3/cm3/sync.h>
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/* Primitives for implementing locking.
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*
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* Must always be used in a pair, with a call to load_exclusive being
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* followed immediately or near-immediately by a call to store_exclusive().
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* Failure to observe this rule may lead to undefined results. */
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// Use ldrex and strex directly if available.
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// Otherwise, disable interrupts to ensure exclusivity.
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#if defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__)
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#define load_exclusive __ldrex
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#define store_exclusive __strex
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#else
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static inline uint32_t load_exclusive(volatile uint32_t* addr)
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{
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__disable_irq();
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return *addr;
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}
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static inline uint32_t store_exclusive(uint32_t val, volatile uint32_t* addr)
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{
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*addr = val;
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__enable_irq();
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return 0;
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}
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#endif
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#endif /* __LOCKING_H__ */
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