1/* 2 * Copyright (c) 1998-2010 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_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. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23 24#include <architecture/i386/asm_help.h> 25 26 TEXT 27 28/* 29 * void 30 * OSSpinLockUnlock(p) 31 * int *p; 32 * 33 * Unlock the lock pointed to by p. 34 */ 35 36LEAF(_OSSpinLockUnlock, 0) 37LEAF(_IOSpinUnlock, 0) 38LEAF(_ev_unlock, 0) 39 movl $0, (%rdi) 40END(_OSSpinLockUnlock) 41 42 43/* 44 * int 45 * OSSpinLockTry(p) 46 * int *p; 47 * 48 * Try to lock p. Return zero if not successful. 49 */ 50 51LEAF(_OSSpinLockTry, 0) 52LEAF(_IOTrySpinLock, 0) 53LEAF(_ev_try_lock, 0) 54 xorl %eax, %eax 55 orl $-1, %edx 56 lock 57 cmpxchgl %edx, (%rdi) 58 setz %dl 59 movzbl %dl, %eax 60END(_OSSpinLockTry) 61