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/*-
* Copyright (c) 2007 Warner Losh
* 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. 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.
*
* 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 ISC_ATOMIC_H
#define ISC_ATOMIC_H 1
#include <isc/platform.h>
#include <isc/types.h>
#include <machine/atomic.h>
#ifdef __FreeBSD__
static inline isc_int32_t
isc_atomic_xadd(isc_int32_t *p, isc_int32_t val)
{
return atomic_fetchadd_int(p, val);
}
static inline void
isc_atomic_store(isc_int32_t *p, isc_int32_t val)
{
atomic_store_rel_int(p, val);
}
static inline isc_int32_t
isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val)
{
register int done, ras_start;
__asm __volatile("1:\n"
"adr %1, 1b\n"
"mov %0, #0xe0000004\n"
"str %1, [%0]\n"
"mov %0, #0xe0000008\n"
"adr %1, 2f\n"
"str %1, [%0]\n"
"ldr %1, [%2]\n"
"cmp %1, %3\n"
"streq %4, [%2]\n"
"2:\n"
"mov %3, #0\n"
"mov %0, #0xe0000004\n"
"str %3, [%0]\n"
"mov %3, #0xffffffff\n"
"mov %0, #0xe0000008\n"
"str %3, [%0]\n"
: "=r" (ras_start), "=r" (done)
,"+r" (p), "+r" (cmpval), "+r" (val) : : "memory");
return (done);
}
#else /* !FreeBSD */
#error "unsupported compiler. disable atomic ops by --disable-atomic"
#endif
#endif /* ISC_ATOMIC_H */
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