33d0c9ec96
not repeat the problem and while this should not be used at all on mips64, the real fix is a little diablo in the details. So hack around it for now (yes, it results in only half of the locks being used on 64bit platforms. no biggie for a hack).
88 lines
3.1 KiB
C
88 lines
3.1 KiB
C
/* $NetBSD: atomic_cas_generic.c,v 1.2 2009/12/18 22:37:18 pooka Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: atomic_cas_generic.c,v 1.2 2009/12/18 22:37:18 pooka Exp $");
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/*
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* This is basically common/lib/libc/atomic/atomic_init_testset.c
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* which always assumes MP and never uses RAS. This is used only on
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* some archs. See Makefile.rumpkern for more information.
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*/
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#include "atomic_op_namespace.h"
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#include <sys/types.h>
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#include <sys/atomic.h>
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#include <sys/lock.h>
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#define I2 __SIMPLELOCK_UNLOCKED, __SIMPLELOCK_UNLOCKED,
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#define I16 I2 I2 I2 I2 I2 I2 I2 I2
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#define I128 I16 I16 I16 I16 I16 I16 I16 I16
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static __cpu_simple_lock_t atomic_locks[128] = { I128 };
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uint32_t
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_atomic_cas_32(volatile uint32_t *ptr, uint32_t old, uint32_t new)
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{
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__cpu_simple_lock_t *lock;
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uint32_t ret;
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lock = &atomic_locks[((uintptr_t)ptr >> 3) & 127];
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__cpu_simple_lock(lock);
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ret = *ptr;
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if (__predict_true(ret == old)) {
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*ptr = new;
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}
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__cpu_simple_unlock(lock);
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return ret;
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}
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#undef atomic_cas_32
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#undef atomic_cas_uint
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#undef atomic_cas_ulong
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#undef atomic_cas_ptr
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atomic_op_alias(atomic_cas_32,_atomic_cas_32)
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atomic_op_alias(atomic_cas_uint,_atomic_cas_32)
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__strong_alias(_atomic_cas_uint,_atomic_cas_32)
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atomic_op_alias(atomic_cas_ulong,_atomic_cas_32)
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__strong_alias(_atomic_cas_ulong,_atomic_cas_32)
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atomic_op_alias(atomic_cas_ptr,_atomic_cas_32)
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__strong_alias(_atomic_cas_ptr,_atomic_cas_32)
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atomic_op_alias(atomic_cas_32_ni,_atomic_cas_32)
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__strong_alias(_atomic_cas_32_ni,_atomic_cas_32)
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atomic_op_alias(atomic_cas_uint_ni,_atomic_cas_32)
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__strong_alias(_atomic_cas_uint_ni,_atomic_cas_32)
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atomic_op_alias(atomic_cas_ulong_ni,_atomic_cas_32)
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__strong_alias(_atomic_cas_ulong_ni,_atomic_cas_32)
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atomic_op_alias(atomic_cas_ptr_ni,_atomic_cas_32)
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__strong_alias(_atomic_cas_ptr_ni,_atomic_cas_32)
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