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/*-
* Copyright (c) 2016 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _ASM_ATOMIC64_H_
#define _ASM_ATOMIC64_H_
#include <sys/cdefs.h>
#include <sys/types.h>
#include <machine/atomic.h>
typedef struct {
volatile int64_t counter;
} atomic64_t;
/*------------------------------------------------------------------------*
* 64-bit atomic operations
*------------------------------------------------------------------------*/
#define atomic64_add(i, v) atomic64_add_return((i), (v))
#define atomic64_sub(i, v) atomic64_sub_return((i), (v))
#define atomic64_inc_return(v) atomic64_add_return(1, (v))
#define atomic64_add_negative(i, v) (atomic64_add_return((i), (v)) < 0)
#define atomic64_add_and_test(i, v) (atomic64_add_return((i), (v)) == 0)
#define atomic64_sub_and_test(i, v) (atomic64_sub_return((i), (v)) == 0)
#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
#define atomic64_dec_return(v) atomic64_sub_return(1, (v))
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
static inline int64_t
atomic64_add_return(int64_t i, atomic64_t *v)
{
return i + atomic_fetchadd_64(&v->counter, i);
}
static inline int64_t
atomic64_sub_return(int64_t i, atomic64_t *v)
{
return atomic_fetchadd_64(&v->counter, -i) - i;
}
static inline void
atomic64_set(atomic64_t *v, int64_t i)
{
atomic_store_rel_64(&v->counter, i);
}
static inline int64_t
atomic64_read(atomic64_t *v)
{
return atomic_load_acq_64(&v->counter);
}
static inline int64_t
atomic64_inc(atomic64_t *v)
{
return atomic_fetchadd_64(&v->counter, 1) + 1;
}
static inline int64_t
atomic64_dec(atomic64_t *v)
{
return atomic_fetchadd_64(&v->counter, -1) - 1;
}
static inline int64_t
atomic64_add_unless(atomic64_t *v, int64_t a, int64_t u)
{
int64_t c;
for (;;) {
c = atomic64_read(v);
if (unlikely(c == u))
break;
if (likely(atomic_cmpset_64(&v->counter, c, c + a)))
break;
}
return (c != u);
}
static inline int64_t
atomic64_xchg(atomic64_t *v, int64_t i)
{
#if defined(__i386__) || defined(__amd64__) || \
defined(__arm__) || defined(__aarch64__)
return (atomic_swap_64(&v->counter, i));
#else
int64_t ret;
for (;;) {
ret = atomic_load_acq_64(&v->counter);
if (atomic_cmpset_64(&v->counter, ret, i))
break;
}
return (ret);
#endif
}
static inline int64_t
atomic64_cmpxchg(atomic64_t *v, int64_t old, int64_t new)
{
int64_t ret = old;
for (;;) {
if (atomic_cmpset_64(&v->counter, old, new))
break;
ret = atomic_load_acq_64(&v->counter);
if (ret != old)
break;
}
return (ret);
}
#endif /* _ASM_ATOMIC64_H_ */
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