projects / apple / xnu.git / blame
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|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 2d21ac55 | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
| 1c79356b | 5 | * |
| 2d21ac55 A |
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. | |
| 8f6c56a5 | 14 | * |
| 2d21ac55 A |
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 | |
| 8f6c56a5 A |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 2d21ac55 A |
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. | |
| 8f6c56a5 | 25 | * |
| 2d21ac55 | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
| 1c79356b A |
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 | |
| 55e303ae A |
50 | .text |
| 51 | .align 2 | |
| 52 | .globl $0 | |
| 1c79356b A |
53 | $0: |
| 54 | .endmacro | |
| 55 | ||
| 56 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
| 57 | ||
| 58 | /* | |
| 91447636 A |
59 | int OSCompareAndSwap( UInt32 oldVal, UInt32 newVal, UInt32 * addr ) |
| 60 | This is now an alias to hw_compare_and_store, see xnu/libkern/Makefile. | |
| 61 | ||
| 62 | void * OSDequeueAtomic(void ** inList, SInt32 inOffset) | |
| 63 | This is also aliased, to hw_dequeue_atomic. | |
| 64 | ||
| 65 | void OSEnqueueAtomic(void ** inList, void * inNewLink, SInt32 inOffset) | |
| 66 | This is aliased to hw_queue_atomic. | |
| 1c79356b A |
67 | */ |
| 68 | ||
| 55e303ae A |
69 | /* |
| 70 | Note: We can not use the hw_atomic routines provided by osfmk/ppc as | |
| 71 | the return the result of the addition not the original value. | |
| 72 | */ | |
| 1c79356b A |
73 | /* |
| 74 | SInt32 OSDecrementAtomic(SInt32 * value) | |
| 75 | */ | |
| 55e303ae A |
76 | ENTRY _OSDecrementAtomic |
| 77 | mr r4, r3 | |
| 78 | li r3, -1 | |
| 79 | b _OSAddAtomic | |
| 1c79356b A |
80 | |
| 81 | /* | |
| 82 | SInt32 OSIncrementAtomic(SInt32 * value) | |
| 83 | */ | |
| 84 | ||
| 55e303ae A |
85 | .align 5 |
| 86 | ||
| 87 | ENTRY _OSIncrementAtomic | |
| 88 | mr r4, r3 | |
| 89 | li r3, 1 | |
| 1c79356b A |
90 | |
| 91 | /* | |
| 92 | SInt32 OSAddAtomic(SInt32 amount, SInt32 * value) | |
| 93 | */ | |
| 94 | ||
| 55e303ae | 95 | ENTRY _OSAddAtomic |
| b0d623f7 | 96 | ENTRY _OSAddAtomicLong |
| 1c79356b | 97 | |
| 55e303ae | 98 | mr r5,r3 /* Save the increment */ |
| 1c79356b | 99 | .L_AAretry: |
| 55e303ae A |
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 */ |