11.20Sriastrad/* $NetBSD: mutex.h,v 1.20 2023/07/12 12:50:13 riastradh Exp $ */ 21.1Smatt 31.1Smatt/*- 41.1Smatt * Copyright (c) 2002, 2007 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 Jason R. Thorpe and Andrew Doran. 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#ifndef _VAX_MUTEX_H_ 331.1Smatt#define _VAX_MUTEX_H_ 341.1Smatt 351.1Smatt/* 361.11Smatt * The VAX mutex implementation is troublesome, because VAX lacks a 371.17Sriastrad * compare-and-swap operation. 381.1Smatt * 391.11Smatt * So we emulate compare-and-swap by raising IPL to lock out interrupts 401.11Smatt * and (if MP) using BBSSI/BBCCI to lock out the other processors. 411.1Smatt */ 421.1Smatt 431.20Sriastrad#include <sys/types.h> 441.20Sriastrad 451.1Smatt#ifndef __MUTEX_PRIVATE 461.1Smatt 471.1Smattstruct kmutex { 481.1Smatt uintptr_t mtx_pad1; 491.1Smatt}; 501.1Smatt 511.1Smatt#else /* __MUTEX_PRIVATE */ 521.1Smatt 531.18Sriastrad#include <machine/intr.h> 541.18Sriastrad 551.1Smattstruct kmutex { 561.1Smatt union { 571.11Smatt /* Adaptive mutex */ 581.11Smatt volatile uintptr_t mtxa_owner; /* 0-3 */ 591.11Smatt 601.11Smatt /* Spin mutex */ 611.7Smatt struct { 621.11Smatt volatile uint8_t mtxs_dummy; 631.11Smatt ipl_cookie_t mtxs_ipl; 641.11Smatt __cpu_simple_lock_t mtxs_lock; 651.11Smatt volatile uint8_t mtxs_unused; 661.11Smatt } s; 671.11Smatt } u; 681.1Smatt}; 691.11Smatt 701.11Smatt#define mtx_owner u.mtxa_owner 711.11Smatt#define mtx_ipl u.s.mtxs_ipl 721.11Smatt#define mtx_lock u.s.mtxs_lock 731.1Smatt 741.3Smatt#define __HAVE_MUTEX_STUBS 1 751.3Smatt#define __HAVE_SPIN_MUTEX_STUBS 1 761.11Smatt#define __HAVE_SIMPLE_MUTEXES 1 771.11Smatt 781.1Smatt#endif /* __MUTEX_PRIVATE */ 791.1Smatt 801.1Smatt#endif /* _VAX_MUTEX_H_ */ 81