lock.h revision 1.10
11.10Schristos/* $NetBSD: lock.h,v 1.10 2006/11/16 01:32:39 christos Exp $ */ 21.1Sthorpej 31.1Sthorpej/*- 41.1Sthorpej * Copyright (c) 2000 The NetBSD Foundation, Inc. 51.1Sthorpej * All rights reserved. 61.1Sthorpej * 71.1Sthorpej * This code is derived from software contributed to The NetBSD Foundation 81.1Sthorpej * by Jason R. Thorpe. 91.1Sthorpej * 101.1Sthorpej * Redistribution and use in source and binary forms, with or without 111.1Sthorpej * modification, are permitted provided that the following conditions 121.1Sthorpej * are met: 131.1Sthorpej * 1. Redistributions of source code must retain the above copyright 141.1Sthorpej * notice, this list of conditions and the following disclaimer. 151.1Sthorpej * 2. Redistributions in binary form must reproduce the above copyright 161.1Sthorpej * notice, this list of conditions and the following disclaimer in the 171.1Sthorpej * documentation and/or other materials provided with the distribution. 181.1Sthorpej * 3. All advertising materials mentioning features or use of this software 191.1Sthorpej * must display the following acknowledgement: 201.1Sthorpej * This product includes software developed by the NetBSD 211.1Sthorpej * Foundation, Inc. and its contributors. 221.1Sthorpej * 4. Neither the name of The NetBSD Foundation nor the names of its 231.1Sthorpej * contributors may be used to endorse or promote products derived 241.1Sthorpej * from this software without specific prior written permission. 251.1Sthorpej * 261.1Sthorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 271.1Sthorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 281.1Sthorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 291.1Sthorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 301.1Sthorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 311.1Sthorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 321.1Sthorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 331.1Sthorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 341.1Sthorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 351.1Sthorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 361.1Sthorpej * POSSIBILITY OF SUCH DAMAGE. 371.1Sthorpej */ 381.1Sthorpej 391.1Sthorpej/* 401.1Sthorpej * Machine-dependent spin lock operations. 411.1Sthorpej */ 421.1Sthorpej 431.1Sthorpej#ifndef _M68K_LOCK_H_ 441.1Sthorpej#define _M68K_LOCK_H_ 451.3Sthorpej 461.10Schristosstatic __inline void 471.3Sthorpej__cpu_simple_lock_init(__cpu_simple_lock_t *alp) 481.3Sthorpej{ 491.3Sthorpej 501.3Sthorpej *alp = __SIMPLELOCK_UNLOCKED; 511.3Sthorpej} 521.3Sthorpej 531.10Schristosstatic __inline void 541.3Sthorpej__cpu_simple_lock(__cpu_simple_lock_t *alp) 551.3Sthorpej{ 561.3Sthorpej 571.8Sperry __asm volatile( 581.3Sthorpej "1: tas %0 \n" 591.3Sthorpej " jne 1b \n" 601.3Sthorpej : "=m" (*alp)); 611.3Sthorpej} 621.3Sthorpej 631.10Schristosstatic __inline int 641.3Sthorpej__cpu_simple_lock_try(__cpu_simple_lock_t *alp) 651.3Sthorpej{ 661.4Sthorpej int __rv; 671.3Sthorpej 681.8Sperry __asm volatile( 691.4Sthorpej " moveq #1, %1 \n" 701.3Sthorpej " tas %0 \n" 711.3Sthorpej " jeq 1f \n" 721.3Sthorpej " moveq #0, %1 \n" 731.3Sthorpej "1: \n" 741.3Sthorpej : "=m" (*alp), "=d" (__rv)); 751.3Sthorpej 761.3Sthorpej return (__rv); 771.3Sthorpej} 781.3Sthorpej 791.10Schristosstatic __inline void 801.3Sthorpej__cpu_simple_unlock(__cpu_simple_lock_t *alp) 811.3Sthorpej{ 821.3Sthorpej 831.3Sthorpej *alp = __SIMPLELOCK_UNLOCKED; 841.3Sthorpej} 851.1Sthorpej 861.1Sthorpej#endif /* _M68K_LOCK_H_ */ 87