diff options
Diffstat (limited to 'lib/libpthread/arch/alpha/include/atomic_ops.h')
| -rw-r--r-- | lib/libpthread/arch/alpha/include/atomic_ops.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/lib/libpthread/arch/alpha/include/atomic_ops.h b/lib/libpthread/arch/alpha/include/atomic_ops.h new file mode 100644 index 0000000..7c3e62b --- /dev/null +++ b/lib/libpthread/arch/alpha/include/atomic_ops.h @@ -0,0 +1,75 @@ +/*- + * Copyright (c) 2003 Daniel Eischen <deischen@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Neither the name of the author nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _ATOMIC_OPS_H_ +#define _ATOMIC_OPS_H_ + +/* + * Atomic swap: + * Atomic (tmp = *dst, *dst = val), then *res = tmp + * + * void atomic_swap_long(long *dst, long val, long *res); + */ +static inline void +atomic_swap_long(long *dst, long val, long *res) +{ + /* $1 and $2 are t0 and t1 respectively. */ + __asm __volatile ( + " ldq $1, %1\n" /* get cache line before lock */ + "1: ldq_l $1, %1\n" /* load *dst asserting lock */ + " mov %2, $2\n" /* save value to be swapped */ + " stq_c $2, %1\n" /* attempt the store; $2 clobbered */ + " beq $2, 1b\n" /* it didn't work, loop */ + " stq $1, %0\n" /* save value of *dst in *res */ + " mb \n" + : "+m"(*res) + : "m"(*dst), "r"(val) + : "memory", "$1", "$2"); /* clobber t0 and t1 */ +} + +static inline void +atomic_swap_int(int *dst, int val, int *res) +{ + /* $1 and $2 are t0 and t1 respectively. */ + __asm __volatile ( + " ldl $1, %1\n" /* get cache line before lock */ + "1: ldl_l $1, %1\n" /* load *dst asserting lock */ + " mov %2, $2\n" /* save value to be swapped */ + " stl_c $2, %1\n" /* attempt the store; $2 clobbered */ + " beq $2, 1b\n" /* it didn't work, loop */ + " stl $1, %0\n" /* save value of *dst in *res */ + " mb \n" + : "+m"(*res) + : "m"(*dst), "r"(val) + : "memory", "$1", "$2"); /* clobber t0 and t1 */ +} + +#define atomic_swap_ptr(d, v, r) \ + atomic_swap_long((long *)(d), (long)(v), (long *)(r)) + +#endif |
