acrn-hypervisor/devicemodel/include/atomic.h

125 lines
4.0 KiB
C
Raw Normal View History

/*
* Copyright (C) 2018 Intel Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef _ATOMIC_H_
#define _ATOMIC_H_
/* Test for GCC >= 4.7.0 */
#if ((__GNUC__ > 4) || (__GNUC__ == 4 && (__GNUC_MINOR__ >= 7)))
/* Since GCC 4.7.0, the __atomic builtins are introduced as a replacement of the
* __sync ones. The original __sync builtins maps to their __atomic counter-part
* using the __ATOMIC_SEQ_CST model and will be eventually deprecated. */
#define atomic_load(ptr) \
__atomic_load_n(ptr, __ATOMIC_SEQ_CST)
#define atomic_store(ptr, val) \
__atomic_store_n(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_xchg(ptr, val) \
__atomic_exchange_n(ptr, val, __ATOMIC_SEQ_CST)
/* Note: expected should also be a pointer. */
#define atomic_cmpxchg(ptr, expected, desired) \
__atomic_compare_exchange_n(ptr, expected, desired, \
false, __ATOMIC_SEQ_CST, __ATOMIC_ACQUIRE)
#define atomic_add_fetch(ptr, val) \
__atomic_add_fetch(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_sub_fetch(ptr, val) \
__atomic_sub_fetch(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_and_fetch(ptr, val) \
__atomic_and_fetch(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_xor_fetch(ptr, val) \
__atomic_xor_fetch(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_or_fetch(ptr, val) \
__atomic_or_fetch(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_nand_fetch(ptr, val) \
__atomic_nand_fetch(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_fetch_add(ptr, val) \
__atomic_fetch_add(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_fetch_sub(ptr, val) \
__atomic_fetch_sub(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_fetch_and(ptr, val) \
__atomic_fetch_and(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_fetch_xor(ptr, val) \
__atomic_fetch_xor(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_fetch_or(ptr, val) \
__atomic_fetch_or(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_fetch_nand(ptr, val) \
__atomic_fetch_nand(ptr, val, __ATOMIC_SEQ_CST)
#define atomic_test_and_set(ptr) \
__atomic_test_and_set(ptr, __ATOMIC_SEQ_CST)
#define atomic_clear(ptr) \
__atomic_clear(ptr, __ATOMIC_SEQ_CST)
#define atomic_thread_fence() \
__atomic_thread_fence(__ATOMIC_SEQ_CST)
#define atomic_signal_fence() \
__atomic_signal_fence(__ATOMIC_SEQ_CST)
#else /* not GCC >= 4.7.0 */
/* __sync builtins do not have load/store interfaces. Use add_fetch and xchg to
* mimic their functinality.
*
* Also note that __sync_lock_test_and_set is rather an atomic exchange
* operation per GCC manual on the __sync builtins.
*/
#define atomic_load(ptr) \
__sync_add_and_fetch(ptr, 0)
#define atomic_store(ptr, val) \
(void)(__sync_lock_test_and_set(ptr, val))
#define atomic_xchg(ptr, val) \
__sync_lock_test_and_set(ptr, val)
/* Note: expected should also be a pointer. */
#define atomic_cmpxchg(ptr, expected, desired) \
__sync_bool_compare_and_swap(ptr, (*(expected)), desired)
#define atomic_add_fetch(ptr, val) \
__sync_add_and_fetch(ptr, val)
#define atomic_sub_fetch(ptr, val) \
__sync_sub_and_fetch(ptr, val)
#define atomic_and_fetch(ptr, val) \
__sync_and_and_fetch(ptr, val)
#define atomic_xor_fetch(ptr, val) \
__sync_xor_and_fetch(ptr, val)
#define atomic_or_fetch(ptr, val) \
__sync_or_and_fetch(ptr, val)
#define atomic_nand_fetch(ptr, val) \
__sync_nand_and_fetch(ptr, val)
#define atomic_fetch_add(ptr, val) \
__sync_fetch_and_add(ptr, val)
#define atomic_fetch_sub(ptr, val) \
__sync_fetch_and_sub(ptr, val)
#define atomic_fetch_and(ptr, val) \
__sync_fetch_and_and(ptr, val)
#define atomic_fetch_xor(ptr, val) \
__sync_fetch_and_xor(ptr, val)
#define atomic_fetch_or(ptr, val) \
__sync_fetch_and_or(ptr, val)
#define atomic_fetch_nand(ptr, val) \
__sync_fetch_and_nand(ptr, val)
#define atomic_test_and_set(ptr) \
(bool)(__sync_lock_test_and_set(ptr, 1))
#define atomic_clear(ptr) \
__sync_lock_release(ptr)
#define atomic_thread_fence() \
__sync_synchronize()
#define atomic_signal_fence() \
__sync_synchronize()
#endif /* GCC >= 4.7.0 */
#endif /* _ATOMIC_H_ */