atomic_cas_generic.c revision 1.1.2.2
1 1.1.2.2 mjf /* $NetBSD: atomic_cas_generic.c,v 1.1.2.2 2009/01/17 13:29:36 mjf Exp $ */ 2 1.1.2.2 mjf 3 1.1.2.2 mjf /*- 4 1.1.2.2 mjf * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 1.1.2.2 mjf * All rights reserved. 6 1.1.2.2 mjf * 7 1.1.2.2 mjf * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 mjf * modification, are permitted provided that the following conditions 9 1.1.2.2 mjf * are met: 10 1.1.2.2 mjf * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 mjf * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 mjf * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 mjf * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 mjf * documentation and/or other materials provided with the distribution. 15 1.1.2.2 mjf * 16 1.1.2.2 mjf * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.1.2.2 mjf * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.1.2.2 mjf * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.1.2.2 mjf * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.1.2.2 mjf * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.1.2.2 mjf * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.1.2.2 mjf * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.1.2.2 mjf * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.1.2.2 mjf * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.1.2.2 mjf * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.1.2.2 mjf * POSSIBILITY OF SUCH DAMAGE. 27 1.1.2.2 mjf */ 28 1.1.2.2 mjf 29 1.1.2.2 mjf #include <sys/cdefs.h> 30 1.1.2.2 mjf __KERNEL_RCSID(0, "$NetBSD: atomic_cas_generic.c,v 1.1.2.2 2009/01/17 13:29:36 mjf Exp $"); 31 1.1.2.2 mjf 32 1.1.2.2 mjf /* 33 1.1.2.2 mjf * This is basically common/lib/libc/atomic/atomic_init_testset.c 34 1.1.2.2 mjf * which always assumes MP and never uses RAS. This is used only on 35 1.1.2.2 mjf * some archs. See Makefile.rumpkern for more information. 36 1.1.2.2 mjf */ 37 1.1.2.2 mjf 38 1.1.2.2 mjf #include "atomic_op_namespace.h" 39 1.1.2.2 mjf 40 1.1.2.2 mjf #include <sys/types.h> 41 1.1.2.2 mjf #include <sys/atomic.h> 42 1.1.2.2 mjf #include <sys/lock.h> 43 1.1.2.2 mjf 44 1.1.2.2 mjf #define I2 __SIMPLELOCK_UNLOCKED, __SIMPLELOCK_UNLOCKED, 45 1.1.2.2 mjf #define I16 I2 I2 I2 I2 I2 I2 I2 I2 46 1.1.2.2 mjf #define I128 I16 I16 I16 I16 I16 I16 I16 I16 47 1.1.2.2 mjf 48 1.1.2.2 mjf static __cpu_simple_lock_t atomic_locks[128] = { I128 }; 49 1.1.2.2 mjf 50 1.1.2.2 mjf uint32_t 51 1.1.2.2 mjf _atomic_cas_32(volatile uint32_t *ptr, uint32_t old, uint32_t new) 52 1.1.2.2 mjf { 53 1.1.2.2 mjf __cpu_simple_lock_t *lock; 54 1.1.2.2 mjf uint32_t ret; 55 1.1.2.2 mjf 56 1.1.2.2 mjf lock = &atomic_locks[((uint32_t)ptr >> 3) & 127]; 57 1.1.2.2 mjf __cpu_simple_lock(lock); 58 1.1.2.2 mjf ret = *ptr; 59 1.1.2.2 mjf if (__predict_true(ret == old)) { 60 1.1.2.2 mjf *ptr = new; 61 1.1.2.2 mjf } 62 1.1.2.2 mjf __cpu_simple_unlock(lock); 63 1.1.2.2 mjf 64 1.1.2.2 mjf return ret; 65 1.1.2.2 mjf } 66 1.1.2.2 mjf 67 1.1.2.2 mjf #undef atomic_cas_32 68 1.1.2.2 mjf #undef atomic_cas_uint 69 1.1.2.2 mjf #undef atomic_cas_ulong 70 1.1.2.2 mjf #undef atomic_cas_ptr 71 1.1.2.2 mjf 72 1.1.2.2 mjf atomic_op_alias(atomic_cas_32,_atomic_cas_32) 73 1.1.2.2 mjf atomic_op_alias(atomic_cas_uint,_atomic_cas_32) 74 1.1.2.2 mjf __strong_alias(_atomic_cas_uint,_atomic_cas_32) 75 1.1.2.2 mjf atomic_op_alias(atomic_cas_ulong,_atomic_cas_32) 76 1.1.2.2 mjf __strong_alias(_atomic_cas_ulong,_atomic_cas_32) 77 1.1.2.2 mjf atomic_op_alias(atomic_cas_ptr,_atomic_cas_32) 78 1.1.2.2 mjf __strong_alias(_atomic_cas_ptr,_atomic_cas_32) 79 1.1.2.2 mjf 80 1.1.2.2 mjf atomic_op_alias(atomic_cas_32_ni,_atomic_cas_32) 81 1.1.2.2 mjf __strong_alias(_atomic_cas_32_ni,_atomic_cas_32) 82 1.1.2.2 mjf atomic_op_alias(atomic_cas_uint_ni,_atomic_cas_32) 83 1.1.2.2 mjf __strong_alias(_atomic_cas_uint_ni,_atomic_cas_32) 84 1.1.2.2 mjf atomic_op_alias(atomic_cas_ulong_ni,_atomic_cas_32) 85 1.1.2.2 mjf __strong_alias(_atomic_cas_ulong_ni,_atomic_cas_32) 86 1.1.2.2 mjf atomic_op_alias(atomic_cas_ptr_ni,_atomic_cas_32) 87 1.1.2.2 mjf __strong_alias(_atomic_cas_ptr_ni,_atomic_cas_32) 88
Indexes created Wed Oct 01 07:09:59 GMT 2025