1/* $NetBSD: atomic_nand_32.S,v 1.2 2014/03/04 16:15:28 matt Exp $ */ 2 3/*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas <matt@3am-software.com> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "atomic_op_asm.h" 33 34#ifdef _ARM_ARCH_6 35 36ENTRY_NP(_atomic_nand_32) 37 mov ip, r0 381: ldrex r0, [ip] /* load old value (to be returned) */ 39 mvns r3, r0 /* complement source */ 40 ands r3, r3, r1 /* calculate new value */ 41 strex r2, r3, [ip] /* try to store */ 42 cmp r2, #0 /* succeed? */ 43 bne 1b /* no, try again */ 44#ifdef _ARM_ARCH_7 45 dmb 46#else 47 mcr p15, 0, r2, c7, c10, 5 /* data memory barrier */ 48#endif 49 RET /* return old value */ 50END(_atomic_nand_32) 51 52ATOMIC_OP_ALIAS(atomic_nand_32,_atomic_nand_32) 53ATOMIC_OP_ALIAS(atomic_nand_uint,_atomic_nand_32) 54ATOMIC_OP_ALIAS(atomic_nand_ulong,_atomic_nand_32) 55CRT_ALIAS(__sync_fetch_and_nand_4,_atomic_nand_32) 56STRONG_ALIAS(_atomic_nand_uint,_atomic_nand_32) 57STRONG_ALIAS(_atomic_nand_ulong,_atomic_nand_32) 58 59ENTRY_NP(_atomic_nand_32_nv) 60 mov ip, r0 /* need r0 for return value */ 611: ldrex r0, [ip] /* load old value */ 62 mvns r0, r0 /* complement source */ 63 ands r0, r0, r1 /* calculate new value (return value) */ 64 strex r2, r0, [ip] /* try to store */ 65 cmp r2, #0 /* succeed? */ 66 bne 1b /* no, try again? */ 67#ifdef _ARM_ARCH_7 68 dmb 69#else 70 mcr p15, 0, r2, c7, c10, 5 /* data memory barrier */ 71#endif 72 RET /* return new value */ 73END(_atomic_nand_32_nv) 74 75ATOMIC_OP_ALIAS(atomic_nand_32_nv,_atomic_nand_32_nv) 76ATOMIC_OP_ALIAS(atomic_nand_uint_nv,_atomic_nand_32_nv) 77ATOMIC_OP_ALIAS(atomic_nand_ulong_nv,_atomic_nand_32_nv) 78CRT_ALIAS(__sync_nand_and_fetch_4,_atomic_nand_32_nv) 79STRONG_ALIAS(_atomic_nand_uint_nv,_atomic_nand_32_nv) 80STRONG_ALIAS(_atomic_nand_ulong_nv,_atomic_nand_32_nv) 81 82#endif /* _ARM_ARCH_6 */ 83