11.7Sskrll/*	$NetBSD: atomic_swap_16.S,v 1.7 2021/07/28 07:32:20 skrll Exp $ */
21.1Smatt
31.1Smatt/*-
41.1Smatt * Copyright (c) 2013 The NetBSD Foundation, Inc.
51.1Smatt * All rights reserved.
61.1Smatt *
71.1Smatt * This code is derived from software contributed to The NetBSD Foundation
81.1Smatt * by Matt Thomas of 3am Software Foundry.
91.1Smatt *
101.1Smatt * Redistribution and use in source and binary forms, with or without
111.1Smatt * modification, are permitted provided that the following conditions
121.1Smatt * are met:
131.1Smatt * 1. Redistributions of source code must retain the above copyright
141.1Smatt *    notice, this list of conditions and the following disclaimer.
151.1Smatt * 2. Redistributions in binary form must reproduce the above copyright
161.1Smatt *    notice, this list of conditions and the following disclaimer in the
171.1Smatt *    documentation and/or other materials provided with the distribution.
181.1Smatt *
191.1Smatt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
201.1Smatt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
211.1Smatt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
221.1Smatt * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
231.1Smatt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
241.1Smatt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
251.1Smatt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
261.1Smatt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
271.1Smatt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
281.1Smatt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
291.1Smatt * POSSIBILITY OF SUCH DAMAGE.
301.1Smatt */
311.1Smatt
321.1Smatt#include "atomic_op_asm.h"
331.1Smatt
341.6Sskrll#if defined(_ARM_ARCH_6)
351.6Sskrll
361.7SskrllENTRY_NP(__sync_lock_test_and_set_2)
371.7Sskrll	DMB
381.7Sskrll	/* FALLTHROUGH */
391.7Sskrll
401.1SmattENTRY_NP(_atomic_swap_16)
411.1Smatt	mov	ip, r0
421.1Smatt1:
431.1Smatt	ldrexh	r0, [ip]
441.1Smatt	strexh	r3, r1, [ip]
451.1Smatt	cmp	r3, #0
461.1Smatt	bne	1b
471.1Smatt	RET
481.1SmattEND(_atomic_swap_16)
491.7SskrllEND(__sync_lock_test_and_set_2)
501.1Smatt
511.1SmattATOMIC_OP_ALIAS(atomic_swap_16,_atomic_swap_16)
521.1SmattATOMIC_OP_ALIAS(atomic_swap_short,_atomic_swap_16)
531.1SmattATOMIC_OP_ALIAS(atomic_swap_ushort,_atomic_swap_16)
541.3SjoergCRT_ALIAS(__atomic_exchange_2,_atomic_swap_16)
551.1SmattSTRONG_ALIAS(_atomic_swap_short,_atomic_swap_16)
561.1SmattSTRONG_ALIAS(_atomic_swap_ushort,_atomic_swap_16)
571.1Smatt
581.7Sskrll
591.4Sjustin#if (!defined(_KERNEL) || !defined(_RUMPKERNEL)) && !defined(_STANDALONE)
601.1SmattENTRY_NP(__sync_lock_release_2)
611.1Smatt	mov	r1, #0
621.7Sskrll	DMB
631.1Smatt	strh	r1, [r0]
641.1Smatt	RET
651.1SmattEND(__sync_lock_release_2)
661.2Smatt#endif
671.1Smatt#endif /* _ARM_ARCH_6 */
68