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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* 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, 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 AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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 _OPENSOLARIS_SYS_ATOMIC_H_
#define _OPENSOLARIS_SYS_ATOMIC_H_
#ifndef _STANDALONE
#include <sys/types.h>
#include <machine/atomic.h>
#define atomic_sub_64 atomic_subtract_64
#if defined(__i386__) && (defined(_KERNEL) || defined(KLD_MODULE))
#define I386_HAVE_ATOMIC64
#endif
#if defined(__i386__) || defined(__amd64__) || defined(__arm__)
/* No spurious failures from fcmpset. */
#define STRONG_FCMPSET
#endif
#if !defined(__LP64__) && !defined(__mips_n32) && \
!defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
!defined(HAS_EMULATED_ATOMIC64)
extern void atomic_add_64(volatile uint64_t *target, int64_t delta);
extern void atomic_dec_64(volatile uint64_t *target);
extern uint64_t atomic_swap_64(volatile uint64_t *a, uint64_t value);
extern uint64_t atomic_load_64(volatile uint64_t *a);
extern uint64_t atomic_add_64_nv(volatile uint64_t *target, int64_t delta);
extern uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
uint64_t newval);
#endif
#define membar_consumer() atomic_thread_fence_acq()
#define membar_producer() atomic_thread_fence_rel()
#define membar_sync() atomic_thread_fence_seq_cst()
static __inline uint32_t
atomic_add_32_nv(volatile uint32_t *target, int32_t delta)
{
return (atomic_fetchadd_32(target, delta) + delta);
}
static __inline uint_t
atomic_add_int_nv(volatile uint_t *target, int delta)
{
return (atomic_add_32_nv(target, delta));
}
static __inline void
atomic_inc_32(volatile uint32_t *target)
{
atomic_add_32(target, 1);
}
static __inline uint32_t
atomic_inc_32_nv(volatile uint32_t *target)
{
return (atomic_add_32_nv(target, 1));
}
static __inline void
atomic_dec_32(volatile uint32_t *target)
{
atomic_subtract_32(target, 1);
}
static __inline uint32_t
atomic_dec_32_nv(volatile uint32_t *target)
{
return (atomic_add_32_nv(target, -1));
}
#ifndef __sparc64__
static inline uint32_t
atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
{
#ifdef STRONG_FCMPSET
(void) atomic_fcmpset_32(target, &cmp, newval);
#else
uint32_t expected = cmp;
do {
if (atomic_fcmpset_32(target, &cmp, newval))
break;
} while (cmp == expected);
#endif
return (cmp);
}
#endif
#if defined(__LP64__) || defined(__mips_n32) || \
defined(ARM_HAVE_ATOMIC64) || defined(I386_HAVE_ATOMIC64) || \
defined(HAS_EMULATED_ATOMIC64)
static __inline void
atomic_dec_64(volatile uint64_t *target)
{
atomic_subtract_64(target, 1);
}
static inline uint64_t
atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
{
return (atomic_fetchadd_64(target, delta) + delta);
}
#ifndef __sparc64__
static inline uint64_t
atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
{
#ifdef STRONG_FCMPSET
(void) atomic_fcmpset_64(target, &cmp, newval);
#else
uint64_t expected = cmp;
do {
if (atomic_fcmpset_64(target, &cmp, newval))
break;
} while (cmp == expected);
#endif
return (cmp);
}
#endif
#endif
static __inline void
atomic_inc_64(volatile uint64_t *target)
{
atomic_add_64(target, 1);
}
static __inline uint64_t
atomic_inc_64_nv(volatile uint64_t *target)
{
return (atomic_add_64_nv(target, 1));
}
static __inline uint64_t
atomic_dec_64_nv(volatile uint64_t *target)
{
return (atomic_add_64_nv(target, -1));
}
#ifdef __LP64__
static __inline void *
atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
{
return ((void *)atomic_cas_64((volatile uint64_t *)target,
(uint64_t)cmp, (uint64_t)newval));
}
#else
static __inline void *
atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
{
return ((void *)atomic_cas_32((volatile uint32_t *)target,
(uint32_t)cmp, (uint32_t)newval));
}
#endif /* __LP64__ */
#else /* _STANDALONE */
/*
* sometimes atomic_add_64 is defined, sometimes not, but the
* following is always right for the boot loader.
*/
#undef atomic_add_64
#define atomic_add_64(ptr, val) *(ptr) += val
#undef atomic_sub_64
#define atomic_sub_64(ptr, val) *(ptr) -= val
#endif /* !_STANDALONE */
#endif /* !_OPENSOLARIS_SYS_ATOMIC_H_ */
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