1/* $NetBSD: atomic_cas_generic.c,v 1.1 2009/01/12 02:22:55 pooka Exp $ */ 2 3/*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__KERNEL_RCSID(0, "$NetBSD: atomic_cas_generic.c,v 1.1 2009/01/12 02:22:55 pooka Exp $"); 31 32/* 33 * This is basically common/lib/libc/atomic/atomic_init_testset.c 34 * which always assumes MP and never uses RAS. This is used only on 35 * some archs. See Makefile.rumpkern for more information. 36 */ 37 38#include "atomic_op_namespace.h" 39 40#include <sys/types.h> 41#include <sys/atomic.h> 42#include <sys/lock.h> 43 44#define I2 __SIMPLELOCK_UNLOCKED, __SIMPLELOCK_UNLOCKED, 45#define I16 I2 I2 I2 I2 I2 I2 I2 I2 46#define I128 I16 I16 I16 I16 I16 I16 I16 I16 47 48static __cpu_simple_lock_t atomic_locks[128] = { I128 }; 49 50uint32_t 51_atomic_cas_32(volatile uint32_t *ptr, uint32_t old, uint32_t new) 52{ 53 __cpu_simple_lock_t *lock; 54 uint32_t ret; 55 56 lock = &atomic_locks[((uintptr_t)ptr >> 3) & 127]; 57 __cpu_simple_lock(lock); 58 ret = *ptr; 59 if (__predict_true(ret == old)) { 60 *ptr = new; 61 } 62 __cpu_simple_unlock(lock); 63 64 return ret; 65} 66 67#undef atomic_cas_32 68#undef atomic_cas_uint 69#undef atomic_cas_ulong 70#undef atomic_cas_ptr 71 72atomic_op_alias(atomic_cas_32,_atomic_cas_32) 73atomic_op_alias(atomic_cas_uint,_atomic_cas_32) 74__strong_alias(_atomic_cas_uint,_atomic_cas_32) 75atomic_op_alias(atomic_cas_ulong,_atomic_cas_32) 76__strong_alias(_atomic_cas_ulong,_atomic_cas_32) 77atomic_op_alias(atomic_cas_ptr,_atomic_cas_32) 78__strong_alias(_atomic_cas_ptr,_atomic_cas_32) 79 80atomic_op_alias(atomic_cas_32_ni,_atomic_cas_32) 81__strong_alias(_atomic_cas_32_ni,_atomic_cas_32) 82atomic_op_alias(atomic_cas_uint_ni,_atomic_cas_32) 83__strong_alias(_atomic_cas_uint_ni,_atomic_cas_32) 84atomic_op_alias(atomic_cas_ulong_ni,_atomic_cas_32) 85__strong_alias(_atomic_cas_ulong_ni,_atomic_cas_32) 86atomic_op_alias(atomic_cas_ptr_ni,_atomic_cas_32) 87__strong_alias(_atomic_cas_ptr_ni,_atomic_cas_32) 88