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 <arm/asm_help.h> 25 26/* 27 * void 28 * OSSpinLockUnlock(p) 29 * int *p; 30 * 31 * Unlock the lock pointed to by p. 32 */ 33 34EnterARM(_OSSpinLockUnlock) 35EnterARM_NoAlign(_IOSpinUnlock) 36EnterARM_NoAlign(_ev_unlock) 37 mov r1, #0 38 str r1, [r0] 39 bx lr 40 41/* 42 * int 43 * OSSpinLockTry(p) 44 * int *p; 45 * 46 * Try to lock p. Return zero if not successful. 47 */ 48 49EnterARM(_OSSpinLockTry) 50EnterARM_NoAlign(_IOTrySpinLock) 51EnterARM_NoAlign(_ev_try_lock) 52 mov r1, #0 53 swp r1, r1, [r0] 54 cmp r1, #0 55 moveq r0, #1 56 movne r0, #0 57 bx lr 58