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/* $OpenBSD: atomic.h,v 1.6 2019/03/09 06:14:21 visa Exp $ */
/*
* Copyright (c) 2014 David Gwynne <dlg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _SYS_ATOMIC_H_
#define _SYS_ATOMIC_H_
#include <machine/atomic.h>
/*
* an arch wanting to provide its own implementations does so by defining
* macros.
*/
/*
* atomic_cas_*
*/
#ifndef atomic_cas_uint
static inline unsigned int
atomic_cas_uint(volatile unsigned int *p, unsigned int o, unsigned int n)
{
return __sync_val_compare_and_swap(p, o, n);
}
#endif
#ifndef atomic_cas_ulong
static inline unsigned long
atomic_cas_ulong(volatile unsigned long *p, unsigned long o, unsigned long n)
{
return __sync_val_compare_and_swap(p, o, n);
}
#endif
#ifndef atomic_cas_ptr
static inline void *
atomic_cas_ptr(volatile void *pp, void *o, void *n)
{
void * volatile *p = (void * volatile *)pp;
return __sync_val_compare_and_swap(p, o, n);
}
#endif
/*
* atomic_swap_*
*/
#ifndef atomic_swap_uint
static inline unsigned int
atomic_swap_uint(volatile unsigned int *p, unsigned int v)
{
return __sync_lock_test_and_set(p, v);
}
#endif
#ifndef atomic_swap_ulong
static inline unsigned long
atomic_swap_ulong(volatile unsigned long *p, unsigned long v)
{
return __sync_lock_test_and_set(p, v);
}
#endif
#ifndef atomic_swap_ptr
static inline void *
atomic_swap_ptr(volatile void *pp, void *v)
{
void * volatile *p = (void * volatile *)pp;
return __sync_lock_test_and_set(p, v);
}
#endif
/*
* atomic_add_*_nv - add and fetch
*/
#ifndef atomic_add_int_nv
static inline unsigned int
atomic_add_int_nv(volatile unsigned int *p, unsigned int v)
{
return __sync_add_and_fetch(p, v);
}
#endif
#ifndef atomic_add_long_nv
static inline unsigned long
atomic_add_long_nv(volatile unsigned long *p, unsigned long v)
{
return __sync_add_and_fetch(p, v);
}
#endif
/*
* atomic_add - add
*/
#ifndef atomic_add_int
#define atomic_add_int(_p, _v) ((void)atomic_add_int_nv((_p), (_v)))
#endif
#ifndef atomic_add_long
#define atomic_add_long(_p, _v) ((void)atomic_add_long_nv((_p), (_v)))
#endif
/*
* atomic_inc_*_nv - increment and fetch
*/
#ifndef atomic_inc_int_nv
#define atomic_inc_int_nv(_p) atomic_add_int_nv((_p), 1)
#endif
#ifndef atomic_inc_long_nv
#define atomic_inc_long_nv(_p) atomic_add_long_nv((_p), 1)
#endif
/*
* atomic_inc_* - increment
*/
#ifndef atomic_inc_int
#define atomic_inc_int(_p) ((void)atomic_inc_int_nv(_p))
#endif
#ifndef atomic_inc_long
#define atomic_inc_long(_p) ((void)atomic_inc_long_nv(_p))
#endif
/*
* atomic_sub_*_nv - sub and fetch
*/
#ifndef atomic_sub_int_nv
static inline unsigned int
atomic_sub_int_nv(volatile unsigned int *p, unsigned int v)
{
return __sync_sub_and_fetch(p, v);
}
#endif
#ifndef atomic_sub_long_nv
static inline unsigned long
atomic_sub_long_nv(volatile unsigned long *p, unsigned long v)
{
return __sync_sub_and_fetch(p, v);
}
#endif
/*
* atomic_sub_* - sub
*/
#ifndef atomic_sub_int
#define atomic_sub_int(_p, _v) ((void)atomic_sub_int_nv((_p), (_v)))
#endif
#ifndef atomic_sub_long
#define atomic_sub_long(_p, _v) ((void)atomic_sub_long_nv((_p), (_v)))
#endif
/*
* atomic_dec_*_nv - decrement and fetch
*/
#ifndef atomic_dec_int_nv
#define atomic_dec_int_nv(_p) atomic_sub_int_nv((_p), 1)
#endif
#ifndef atomic_dec_long_nv
#define atomic_dec_long_nv(_p) atomic_sub_long_nv((_p), 1)
#endif
/*
* atomic_dec_* - decrement
*/
#ifndef atomic_dec_int
#define atomic_dec_int(_p) ((void)atomic_dec_int_nv(_p))
#endif
#ifndef atomic_dec_long
#define atomic_dec_long(_p) ((void)atomic_dec_long_nv(_p))
#endif
/*
* memory barriers
*/
#ifndef membar_enter
#define membar_enter() __sync_synchronize()
#endif
#ifndef membar_exit
#define membar_exit() __sync_synchronize()
#endif
#ifndef membar_producer
#define membar_producer() __sync_synchronize()
#endif
#ifndef membar_consumer
#define membar_consumer() __sync_synchronize()
#endif
#ifndef membar_sync
#define membar_sync() __sync_synchronize()
#endif
#ifndef membar_enter_after_atomic
#define membar_enter_after_atomic() membar_enter()
#endif
#ifndef membar_exit_before_atomic
#define membar_exit_before_atomic() membar_exit()
#endif
#ifdef _KERNEL
/*
* Force any preceding reads to happen before any subsequent reads that
* depend on the value returned by the preceding reads.
*/
static inline void
membar_datadep_consumer(void)
{
#ifdef __alpha__
membar_consumer();
#endif
}
#define READ_ONCE(x) ({ \
typeof(x) __tmp = *(volatile typeof(x) *)&(x); \
membar_datadep_consumer(); \
__tmp; \
})
#define WRITE_ONCE(x, val) ({ \
typeof(x) __tmp = (val); \
*(volatile typeof(x) *)&(x) = __tmp; \
__tmp; \
})
#endif /* _KERNEL */
#endif /* _SYS_ATOMIC_H_ */
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