diff options
| -rw-r--r-- | sys/arch/sparc64/include/atomic.h | 55 |
1 files changed, 45 insertions, 10 deletions
diff --git a/sys/arch/sparc64/include/atomic.h b/sys/arch/sparc64/include/atomic.h index 74206a35bb3..519b5babefc 100644 --- a/sys/arch/sparc64/include/atomic.h +++ b/sys/arch/sparc64/include/atomic.h @@ -1,23 +1,58 @@ -/* $OpenBSD: atomic.h,v 1.2 2007/02/19 17:18:43 deraadt Exp $ */ +/* $OpenBSD: atomic.h,v 1.3 2007/03/13 08:34:03 art 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. + */ -/* Public Domain */ - -#ifndef __SPARC64_ATOMIC_H__ -#define __SPARC64_ATOMIC_H__ +#ifndef _SPARC64_ATOMIC_H_ +#define _SPARC64_ATOMIC_H_ #if defined(_KERNEL) +static __inline unsigned int +sparc64_casa(volatile unsigned int *uip, unsigned int expect, unsigned int new) +{ + __asm __volatile("casa [%2] %3, %4, %0" + : "+r" (new), "=m" (*uip) + : "r" (uip), "n" (ASI_N), "r" (expect), "m" (*uip)); + + return (new); +} + static __inline void -atomic_setbits_int(__volatile unsigned int *uip, unsigned int v) +atomic_setbits_int(volatile unsigned int *uip, unsigned int v) { - *uip |= v; + volatile unsigned int e, r; + + r = *uip; + do { + e = r; + r = sparc64_casa(uip, e, e | v); + } while (r != e); } static __inline void -atomic_clearbits_int(__volatile unsigned int *uip, unsigned int v) +atomic_clearbits_int(volatile unsigned int *uip, unsigned int v) { - *uip &= ~v; + volatile unsigned int e, r; + + r = *uip; + do { + e = r; + r = sparc64_casa(uip, e, e & ~v); + } while (r != e); } #endif /* defined(_KERNEL) */ -#endif /* __SPARC64_ATOMIC_H__ */ +#endif /* _SPARC64_ATOMIC_H_ */ |