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Commit	Line	Data
	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1997-1998 Apple Computer, Inc.
	24	*
	25	*
	26	* HISTORY
	27	*
	28	* sdouglas 22 Oct 97 - first checked in from DriverServices
	29	* sdouglas 28 Jul 98 - start IOKit
	30	*/
	31
	32	#include <architecture/ppc/asm_help.h>
	33
	34	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	35	;
	36	; ENTRY functionName
	37	;
	38	; Assembly directives to begin an exported function.
	39	;
	40	; Takes: functionName - name of the exported function
	41	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	42
	43	.macro ENTRY
	44	.text
	45	.align 2
	46	.globl $0
	47	$0:
	48	.endmacro
	49
	50	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	51
	52	/*
	53	int OSCompareAndSwap( UInt32 oldVal, UInt32 newVal, UInt32 * addr )
	54	*/
	55
	56
	57	ENTRY _OSCompareAndSwap
	58
	59	lwarx r6, 0,r5 /* CEMV10 */
	60	.L_CASretry:
	61	lwarx r6, 0,r5
	62	cmpw r6, r3
	63	bne- .L_CASfail
	64	stwcx. r4, 0,r5
	65	bne- .L_CASretry
	66	isync
	67	li r3, 1
	68	blr
	69	.L_CASfail:
	70	li r3, 0
	71	blr
	72
	73
	74	/*
	75	SInt32 OSDecrementAtomic(SInt32 * value)
	76	*/
	77	ENTRY _OSDecrementAtomic
	78	mr r4, r3
	79	li r3, -1
	80	b _OSAddAtomic
	81
	82	/*
	83	SInt32 OSIncrementAtomic(SInt32 * value)
	84	*/
	85
	86	ENTRY _OSIncrementAtomic
	87	mr r4, r3
	88	li r3, 1
	89
	90	/*
	91	SInt32 OSAddAtomic(SInt32 amount, SInt32 * value)
	92	*/
	93
	94	ENTRY _OSAddAtomic
	95
	96	mr r5,r3 /* Save the increment */
	97	lwarx r3,0,r4 /* CEMV10 */
	98
	99	.L_AAretry:
	100	lwarx r3, 0, r4 /* Grab the area value */
	101	add r6, r3, r5 /* Add the value */
	102	stwcx. r6, 0, r4 /* Try to save the new value */
	103	bne- .L_AAretry /* Didn't get it, try again... */
	104	blr /* Return the original value */
	105
	106
	107