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4626177c3b
The atomic_* functions are often used in contexts where the data they will operate on are volatile (due to being shared between tasks or a task and an interrupt handler). Adding volatile here makes using the atomic_* functions a little easier in those cases and removes a cast from the call sites (which could be obscuring a bug, if for instance the variable was modified to be a uint16_t). Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=None BUG=None TEST=make buildall -j Change-Id: I71356eb3cf2c0506df38532eee767c7d78f9240e Reviewed-on: https://chromium-review.googlesource.com/287516 Trybot-Ready: Anton Staaf <robotboy@chromium.org> Tested-by: Anton Staaf <robotboy@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org>
38 lines
878 B
C
38 lines
878 B
C
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Atomic operations for emulator */
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#ifndef __CROS_EC_ATOMIC_H
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#define __CROS_EC_ATOMIC_H
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#include "common.h"
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static inline void atomic_clear(uint32_t volatile *addr, uint32_t bits)
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{
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__sync_and_and_fetch(addr, ~bits);
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}
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static inline void atomic_or(uint32_t volatile *addr, uint32_t bits)
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{
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__sync_or_and_fetch(addr, bits);
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}
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static inline void atomic_add(uint32_t volatile *addr, uint32_t value)
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{
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__sync_add_and_fetch(addr, value);
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}
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static inline void atomic_sub(uint32_t volatile *addr, uint32_t value)
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{
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__sync_sub_and_fetch(addr, value);
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}
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static inline uint32_t atomic_read_clear(uint32_t volatile *addr)
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{
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return __sync_fetch_and_and(addr, 0);
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}
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#endif /* __CROS_EC_ATOMIC_H */
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