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/* $OpenBSD: atomic.h,v 1.3 2002/02/15 15:31:58 art Exp $ */
/* $NetBSD: atomic.h,v 1.7 2001/12/17 23:34:57 thorpej Exp $ */
/*-
* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Misc. `atomic' operations.
*/
#ifndef _ALPHA_ATOMIC_H_
#define _ALPHA_ATOMIC_H_
/*
* atomic_setbits_ulong:
*
* Atomically set bits in a `unsigned long'.
*/
static __inline void
atomic_setbits_ulong(__volatile unsigned long *ulp, unsigned long v)
{
unsigned long t0;
__asm __volatile(
"# BEGIN atomic_setbits_ulong\n"
"1: ldq_l %0, %3 \n"
" or %0, %2, %0 \n"
" stq_c %0, %1 \n"
" beq %0, 2f \n"
" mb \n"
" br 3f \n"
"2: br 1b \n"
"3: \n"
" # END atomic_setbits_ulong"
: "=&r" (t0), "=m" (*ulp)
: "r" (v), "m" (*ulp)
: "memory");
}
/*
* atomic_clearbits_ulong:
*
* Atomically clear bits in a `unsigned long'.
*/
static __inline void
atomic_clearbits_ulong(__volatile unsigned long *ulp, unsigned long v)
{
unsigned long t0;
__asm __volatile(
"# BEGIN atomic_clearbits_ulong\n"
"1: ldq_l %0, %3 \n"
" and %0, %2, %0 \n"
" stq_c %0, %1 \n"
" beq %0, 2f \n"
" mb \n"
" br 3f \n"
"2: br 1b \n"
"3: \n"
" # END atomic_clearbits_ulong"
: "=&r" (t0), "=m" (*ulp)
: "r" (~v), "m" (*ulp)
: "memory");
}
/*
* atomic_add_ulong:
*
* Atomically add a value to a `unsigned long'.
*/
static __inline void
atomic_add_ulong(__volatile unsigned long *ulp, unsigned long v)
{
unsigned long t0;
__asm __volatile(
"# BEGIN atomic_add_ulong\n"
"1: ldq_l %0, %3 \n"
" addq %0, %2, %0 \n"
" stq_c %0, %1 \n"
" beq %0, 2f \n"
" mb \n"
" br 3f \n"
"2: br 1b \n"
"3: \n"
" # END atomic_add_ulong"
: "=&r" (t0), "=m" (*ulp)
: "r" (v), "m" (*ulp)
: "memory");
}
/*
* atomic_sub_ulong:
*
* Atomically subtract a value from a `unsigned long'.
*/
static __inline void
atomic_sub_ulong(__volatile unsigned long *ulp, unsigned long v)
{
unsigned long t0;
__asm __volatile(
"# BEGIN atomic_sub_ulong\n"
"1: ldq_l %0, %3 \n"
" subq %0, %2, %0 \n"
" stq_c %0, %1 \n"
" beq %0, 2f \n"
" mb \n"
" br 3f \n"
"2: br 1b \n"
"3: \n"
" # END atomic_sub_ulong"
: "=&r" (t0), "=m" (*ulp)
: "r" (v), "m" (*ulp)
: "memory");
}
/*
* atomic_loadlatch_ulong:
*
* Atomically load and latch a `unsigned long' value.
*/
static __inline unsigned long
atomic_loadlatch_ulong(__volatile unsigned long *ulp, unsigned long v)
{
unsigned long t0, v0;
__asm __volatile(
"# BEGIN atomic_loadlatch_ulong\n"
"1: mov %3, %0 \n"
" ldq_l %1, %4 \n"
" stq_c %0, %2 \n"
" beq %0, 2f \n"
" mb \n"
" br 3f \n"
"2: br 1b \n"
"3: \n"
" # END atomic_loadlatch_ulong"
: "=&r" (t0), "=r" (v0), "=m" (*ulp)
: "r" (v), "m" (*ulp)
: "memory");
return (v0);
}
#endif /* _ALPHA_ATOMIC_H_ */
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