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/* $OpenBSD: atomic.h,v 1.7 2011/03/23 16:54:37 pirofti 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_
#if defined(_KERNEL)
static __inline unsigned int
sparc64_cas(volatile unsigned int *uip, unsigned int expect, unsigned int new)
{
__asm __volatile("cas [%2], %3, %0"
: "+r" (new), "=m" (*uip)
: "r" (uip), "r" (expect), "m" (*uip));
return (new);
}
static __inline unsigned long
sparc64_casx(volatile unsigned long *uip, unsigned long expect,
unsigned long new)
{
__asm __volatile("casx [%2], %3, %0"
: "+r" (new), "=m" (*uip)
: "r" (uip), "r" (expect), "m" (*uip));
return (new);
}
static __inline void
atomic_setbits_int(volatile unsigned int *uip, unsigned int v)
{
volatile unsigned int e, r;
r = *uip;
do {
e = r;
r = sparc64_cas(uip, e, e | v);
} while (r != e);
}
static __inline void
atomic_clearbits_int(volatile unsigned int *uip, unsigned int v)
{
volatile unsigned int e, r;
r = *uip;
do {
e = r;
r = sparc64_cas(uip, e, e & ~v);
} while (r != e);
}
static __inline void
atomic_add_ulong(volatile unsigned long *ulp, unsigned long v)
{
volatile unsigned long e, r;
r = *ulp;
do {
e = r;
r = sparc64_casx(ulp, e, e + v);
} while (r != e);
}
#endif /* defined(_KERNEL) */
#endif /* _MACHINE_ATOMIC_H_ */
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