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/* $OpenBSD: atomic.h,v 1.15 2017/07/04 09:00:12 mpi Exp $ */
/*
* Copyright (c) 2007 Artur Grabowski <art@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 _MACHINE_ATOMIC_H_
#define _MACHINE_ATOMIC_H_
static inline unsigned int
_atomic_cas_uint(volatile unsigned int *p, unsigned int e, unsigned int n)
{
__asm volatile("cas [%2], %3, %0"
: "+r" (n), "=m" (*p)
: "r" (p), "r" (e), "m" (*p));
return (n);
}
#define atomic_cas_uint(_p, _e, _n) _atomic_cas_uint((_p), (_e), (_n))
static inline unsigned long
_atomic_cas_ulong(volatile unsigned long *p, unsigned long e, unsigned long n)
{
__asm volatile("casx [%2], %3, %0"
: "+r" (n), "=m" (*p)
: "r" (p), "r" (e), "m" (*p));
return (n);
}
#define atomic_cas_ulong(_p, _e, _n) _atomic_cas_ulong((_p), (_e), (_n))
static inline void *
_atomic_cas_ptr(volatile void *p, void *e, void *n)
{
__asm volatile("casx [%2], %3, %0"
: "+r" (n), "=m" (*(volatile unsigned long *)p)
: "r" (p), "r" (e), "m" (*(volatile unsigned long *)p));
return (n);
}
#define atomic_cas_ptr(_p, _e, _n) _atomic_cas_ptr((_p), (_e), (_n))
#define _def_atomic_swap(_f, _t, _c) \
static inline _t \
_f(volatile _t *p, _t v) \
{ \
_t e; \
_t r; \
\
r = (_t)*p; \
do { \
e = r; \
r = _c(p, e, v); \
} while (r != e); \
\
return (r); \
}
_def_atomic_swap(_atomic_swap_uint, unsigned int, atomic_cas_uint)
_def_atomic_swap(_atomic_swap_ulong, unsigned long, atomic_cas_ulong)
#undef _def_atomic_swap
static inline void *
_atomic_swap_ptr(volatile void *p, void *v)
{
void *e, *r;
r = *(void **)p;
do {
e = r;
r = atomic_cas_ptr(p, e, v);
} while (r != e);
return (r);
}
#define atomic_swap_uint(_p, _v) _atomic_swap_uint(_p, _v)
#define atomic_swap_ulong(_p, _v) _atomic_swap_ulong(_p, _v)
#define atomic_swap_ptr(_p, _v) _atomic_swap_ptr(_p, _v)
#define _def_atomic_op_nv(_f, _t, _c, _op) \
static inline _t \
_f(volatile _t *p, _t v) \
{ \
_t e, r, f; \
\
r = *p; \
do { \
e = r; \
f = e _op v; \
r = _c(p, e, f); \
} while (r != e); \
\
return (f); \
}
_def_atomic_op_nv(_atomic_add_int_nv, unsigned int, atomic_cas_uint, +)
_def_atomic_op_nv(_atomic_add_long_nv, unsigned long, atomic_cas_ulong, +)
_def_atomic_op_nv(_atomic_sub_int_nv, unsigned int, atomic_cas_uint, -)
_def_atomic_op_nv(_atomic_sub_long_nv, unsigned long, atomic_cas_ulong, -)
#undef _def_atomic_op_nv
#define atomic_add_int_nv(_p, _v) _atomic_add_int_nv(_p, _v)
#define atomic_add_long_nv(_p, _v) _atomic_add_long_nv(_p, _v)
#define atomic_sub_int_nv(_p, _v) _atomic_sub_int_nv(_p, _v)
#define atomic_sub_long_nv(_p, _v) _atomic_sub_long_nv(_p, _v)
#define __membar(_m) __asm volatile("membar " _m ::: "memory")
#define membar_enter() __membar("#StoreLoad|#StoreStore")
#define membar_exit() __membar("#LoadStore|#StoreStore")
#define membar_producer() __membar("#StoreStore")
#define membar_consumer() __membar("#LoadLoad")
#define membar_sync() __membar("#Sync")
#if defined(_KERNEL)
static __inline void
atomic_setbits_int(volatile unsigned int *uip, unsigned int v)
{
unsigned int e, r;
r = *uip;
do {
e = r;
r = atomic_cas_uint(uip, e, e | v);
} while (r != e);
}
static __inline void
atomic_clearbits_int(volatile unsigned int *uip, unsigned int v)
{
unsigned int e, r;
r = *uip;
do {
e = r;
r = atomic_cas_uint(uip, e, e & ~v);
} while (r != e);
}
#endif /* defined(_KERNEL) */
#endif /* _MACHINE_ATOMIC_H_ */
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