1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * @OSF_COPYRIGHT@ 30 */ 31 32/* 33 * Mach Operating System 34 * Copyright (c) 1991,1990 Carnegie Mellon University 35 * All Rights Reserved. 36 * 37 * Permission to use, copy, modify and distribute this software and its 38 * documentation is hereby granted, provided that both the copyright 39 * notice and this permission notice appear in all copies of the 40 * software, derivative works or modified versions, and any portions 41 * thereof, and that both notices appear in supporting documentation. 42 * 43 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 44 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 45 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 46 * 47 * Carnegie Mellon requests users of this software to return to 48 * 49 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 50 * School of Computer Science 51 * Carnegie Mellon University 52 * Pittsburgh PA 15213-3890 53 * 54 * any improvements or extensions that they make and grant Carnegie Mellon 55 * the rights to redistribute these changes. 56 */ 57 58/* 59 * Machine-dependent simple locks for the i386. 60 */ 61 62#ifndef _I386_HW_LOCK_TYPES_H_ 63#define _I386_HW_LOCK_TYPES_H_ 64 65/* 66 * The "hardware lock". Low-level locking primitives that 67 * MUST be exported by machine-dependent code; this abstraction 68 * must provide atomic, non-blocking mutual exclusion that 69 * is invulnerable to uniprocessor or SMP races, interrupts, 70 * traps or any other events. 71 * 72 * hw_lock_data_t machine-specific lock data structure 73 * hw_lock_t pointer to hw_lock_data_t 74 * 75 * An implementation must export these data types and must 76 * also provide routines to manipulate them (see prototypes, 77 * below). These routines may be external, inlined, optimized, 78 * or whatever, based on the kernel configuration. In the event 79 * that the implementation wishes to define its own prototypes, 80 * macros, or inline functions, it may define LOCK_HW_PROTOS 81 * to disable the definitions below. 82 * 83 * Mach does not expect these locks to support statistics, 84 * debugging, tracing or any other complexity. In certain 85 * configurations, Mach will build other locking constructs 86 * on top of this one. A correctly functioning Mach port need 87 * only implement these locks to be successful. However, 88 * greater efficiency may be gained with additional machine- 89 * dependent optimizations for the locking constructs defined 90 * later in kern/lock.h.. 91 */ 92struct hslock { 93 int lock_data; 94}; 95typedef struct hslock hw_lock_data_t, *hw_lock_t; 96#define hw_lock_addr(hwl) (&((hwl).lock_data)) 97 98#endif /* _I386_HW_LOCK_TYPES_H_ */ 99 100