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 * Copyright (c) 1997-1998 Apple Computer, Inc. 30 * 31 * 32 * HISTORY 33 * 34 * sdouglas 22 Oct 97 - first checked in from DriverServices 35 * sdouglas 28 Jul 98 - start IOKit 36 */ 37 38#include <architecture/ppc/asm_help.h> 39 40;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 41; 42; ENTRY functionName 43; 44; Assembly directives to begin an exported function. 45; 46; Takes: functionName - name of the exported function 47;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 48 49.macro ENTRY 50 .text 51 .align 2 52 .globl $0 53$0: 54.endmacro 55 56;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 57 58/* 59int OSCompareAndSwap( UInt32 oldVal, UInt32 newVal, UInt32 * addr ) 60 This is now an alias to hw_compare_and_store, see xnu/libkern/Makefile. 61 62void * OSDequeueAtomic(void ** inList, SInt32 inOffset) 63 This is also aliased, to hw_dequeue_atomic. 64 65void OSEnqueueAtomic(void ** inList, void * inNewLink, SInt32 inOffset) 66 This is aliased to hw_queue_atomic. 67*/ 68 69/* 70Note: We can not use the hw_atomic routines provided by osfmk/ppc as 71the return the result of the addition not the original value. 72*/ 73/* 74SInt32 OSDecrementAtomic(SInt32 * value) 75*/ 76 ENTRY _OSDecrementAtomic 77 mr r4, r3 78 li r3, -1 79 b _OSAddAtomic 80 81/* 82SInt32 OSIncrementAtomic(SInt32 * value) 83*/ 84 85 .align 5 86 87 ENTRY _OSIncrementAtomic 88 mr r4, r3 89 li r3, 1 90 91/* 92SInt32 OSAddAtomic(SInt32 amount, SInt32 * value) 93*/ 94 95 ENTRY _OSAddAtomic 96 97 mr r5,r3 /* Save the increment */ 98.L_AAretry: 99 lwarx r3, 0, r4 /* Grab the area value */ 100 add r6, r3, r5 /* Add the value */ 101 stwcx. r6, 0, r4 /* Try to save the new value */ 102 bne- .L_AAretry /* Didn't get it, try again... */ 103 blr /* Return the original value */ 104