1/* $NetBSD: lock_stubs.s,v 1.2 2007/02/09 21:55:01 ad Exp $ */ 2 3/*- 4 * Copyright (c) 2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 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 "opt_lockdebug.h" 33#include "opt_multiprocessor.h" 34 35#include <machine/asm.h> 36 37__KERNEL_RCSID(0, "$NetBSD: lock_stubs.s,v 1.2 2007/02/09 21:55:01 ad Exp $"); 38 39#include "assym.h" 40 41#if defined(MULTIPROCESSOR) 42#define MB mb 43#else 44#define MB /* nothing */ 45#endif 46 47/* 48 * int _lock_cas(uintptr_t *ptr, uintptr_t old, uintptr_t new) 49 */ 50LEAF(_lock_cas, 3) 511: 52 mov a2, v0 53 ldq_l t1, 0(a0) 54 cmpeq t1, a1, t1 55 beq t1, 2f 56 stq_c v0, 0(a0) 57 beq v0, 3f 58 MB 59 RET 602: 61 mov zero, v0 62 MB 63 RET 643: 65 br 1b 66END(_lock_cas) 67 68#if !defined(LOCKDEBUG) 69 70/* 71 * void mutex_enter(kmutex_t *mtx); 72 */ 73LEAF(mutex_enter, 1) 74 LDGP(pv) 75 GET_CURLWP 761: 77 ldq t1, 0(v0) 78 ldq_l t2, 0(a0) 79 bne t2, 2f 80 stq_c t1, 0(a0) 81 beq t1, 3f 82 MB 83 RET 842: 85 lda t12, mutex_vector_enter 86 jmp (t12) 873: 88 br 1b 89END(mutex_enter) 90 91/* 92 * void mutex_exit(kmutex_t *mtx); 93 */ 94LEAF(mutex_exit, 1) 95 LDGP(pv) 96 MB 97 GET_CURLWP 98 ldq t1, 0(v0) 99 mov zero, t3 1001: 101 ldq_l t2, 0(a0) 102 cmpeq t1, t2, t2 103 beq t2, 2f 104 stq_c t3, 0(a0) 105 beq t3, 3f 106 RET 1072: 108 lda t12, mutex_vector_exit 109 jmp (t12) 1103: 111 br 1b 112END(mutex_exit) 113 114#endif /* !LOCKDEBUG */ 115