198 lines
5.3 KiB
C
198 lines
5.3 KiB
C
/*
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* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _OPENSOLARIS_SYS_ATOMIC_H_
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#define _OPENSOLARIS_SYS_ATOMIC_H_
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#ifndef _STANDALONE
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#include <sys/types.h>
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#include <machine/atomic.h>
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#define atomic_sub_64 atomic_subtract_64
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#if defined(__i386__) && (defined(_KERNEL) || defined(KLD_MODULE))
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#define I386_HAVE_ATOMIC64
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#endif
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#if defined(__i386__) || defined(__amd64__) || defined(__arm__)
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/* No spurious failures from fcmpset. */
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#define STRONG_FCMPSET
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#endif
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#if !defined(__LP64__) && !defined(__mips_n32) && \
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!defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
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!defined(HAS_EMULATED_ATOMIC64)
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extern void atomic_add_64(volatile uint64_t *target, int64_t delta);
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extern void atomic_dec_64(volatile uint64_t *target);
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extern uint64_t atomic_swap_64(volatile uint64_t *a, uint64_t value);
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extern uint64_t atomic_load_64(volatile uint64_t *a);
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extern uint64_t atomic_add_64_nv(volatile uint64_t *target, int64_t delta);
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extern uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
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uint64_t newval);
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#endif
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#define membar_consumer() atomic_thread_fence_acq()
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#define membar_producer() atomic_thread_fence_rel()
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#define membar_sync() atomic_thread_fence_seq_cst()
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static __inline uint32_t
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atomic_add_32_nv(volatile uint32_t *target, int32_t delta)
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{
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return (atomic_fetchadd_32(target, delta) + delta);
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}
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static __inline uint_t
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atomic_add_int_nv(volatile uint_t *target, int delta)
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{
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return (atomic_add_32_nv(target, delta));
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}
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static __inline void
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atomic_inc_32(volatile uint32_t *target)
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{
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atomic_add_32(target, 1);
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}
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static __inline uint32_t
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atomic_inc_32_nv(volatile uint32_t *target)
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{
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return (atomic_add_32_nv(target, 1));
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}
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static __inline void
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atomic_dec_32(volatile uint32_t *target)
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{
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atomic_subtract_32(target, 1);
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}
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static __inline uint32_t
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atomic_dec_32_nv(volatile uint32_t *target)
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{
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return (atomic_add_32_nv(target, -1));
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}
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#ifndef __sparc64__
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static inline uint32_t
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atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
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{
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#ifdef STRONG_FCMPSET
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(void) atomic_fcmpset_32(target, &cmp, newval);
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#else
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uint32_t expected = cmp;
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do {
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if (atomic_fcmpset_32(target, &cmp, newval))
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break;
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} while (cmp == expected);
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#endif
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return (cmp);
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}
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#endif
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#if defined(__LP64__) || defined(__mips_n32) || \
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defined(ARM_HAVE_ATOMIC64) || defined(I386_HAVE_ATOMIC64) || \
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defined(HAS_EMULATED_ATOMIC64)
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static __inline void
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atomic_dec_64(volatile uint64_t *target)
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{
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atomic_subtract_64(target, 1);
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}
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static inline uint64_t
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atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
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{
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return (atomic_fetchadd_64(target, delta) + delta);
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}
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#ifndef __sparc64__
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static inline uint64_t
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atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
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{
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#ifdef STRONG_FCMPSET
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(void) atomic_fcmpset_64(target, &cmp, newval);
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#else
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uint64_t expected = cmp;
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do {
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if (atomic_fcmpset_64(target, &cmp, newval))
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break;
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} while (cmp == expected);
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#endif
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return (cmp);
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}
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#endif
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#endif
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static __inline void
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atomic_inc_64(volatile uint64_t *target)
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{
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atomic_add_64(target, 1);
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}
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static __inline uint64_t
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atomic_inc_64_nv(volatile uint64_t *target)
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{
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return (atomic_add_64_nv(target, 1));
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}
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static __inline uint64_t
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atomic_dec_64_nv(volatile uint64_t *target)
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{
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return (atomic_add_64_nv(target, -1));
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}
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#ifdef __LP64__
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static __inline void *
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atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
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{
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return ((void *)atomic_cas_64((volatile uint64_t *)target,
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(uint64_t)cmp, (uint64_t)newval));
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}
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#else
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static __inline void *
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atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
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{
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return ((void *)atomic_cas_32((volatile uint32_t *)target,
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(uint32_t)cmp, (uint32_t)newval));
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}
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#endif /* __LP64__ */
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#else /* _STANDALONE */
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/*
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* sometimes atomic_add_64 is defined, sometimes not, but the
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* following is always right for the boot loader.
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*/
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#undef atomic_add_64
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#define atomic_add_64(ptr, val) *(ptr) += val
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#undef atomic_sub_64
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#define atomic_sub_64(ptr, val) *(ptr) -= val
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#endif /* !_STANDALONE */
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#endif /* !_OPENSOLARIS_SYS_ATOMIC_H_ */
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