projects / apple / xnu.git / blame
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|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| e5568f75 A |
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. | |
| 1c79356b | 11 | * |
| e5568f75 A |
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 | |
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14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| e5568f75 A |
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. | |
| 1c79356b A |
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 | |
| 55e303ae A |
44 | .text |
| 45 | .align 2 | |
| 46 | .globl $0 | |
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47 | $0: |
| 48 | .endmacro | |
| 49 | ||
| 50 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
| 51 | ||
| 52 | /* | |
| 53 | int OSCompareAndSwap( UInt32 oldVal, UInt32 newVal, UInt32 * addr ) | |
| 55e303ae | 54 | This is now an alias to hw_compare_and_store, see xnu/libkern/Makefile |
| 1c79356b A |
55 | */ |
| 56 | ||
| 55e303ae A |
57 | /* |
| 58 | Note: We can not use the hw_atomic routines provided by osfmk/ppc as | |
| 59 | the return the result of the addition not the original value. | |
| 60 | */ | |
| 1c79356b A |
61 | /* |
| 62 | SInt32 OSDecrementAtomic(SInt32 * value) | |
| 63 | */ | |
| 55e303ae A |
64 | ENTRY _OSDecrementAtomic |
| 65 | mr r4, r3 | |
| 66 | li r3, -1 | |
| 67 | b _OSAddAtomic | |
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68 | |
| 69 | /* | |
| 70 | SInt32 OSIncrementAtomic(SInt32 * value) | |
| 71 | */ | |
| 72 | ||
| 55e303ae A |
73 | .align 5 |
| 74 | ||
| 75 | ENTRY _OSIncrementAtomic | |
| 76 | mr r4, r3 | |
| 77 | li r3, 1 | |
| 1c79356b A |
78 | |
| 79 | /* | |
| 80 | SInt32 OSAddAtomic(SInt32 amount, SInt32 * value) | |
| 81 | */ | |
| 82 | ||
| 55e303ae | 83 | ENTRY _OSAddAtomic |
| 1c79356b | 84 | |
| 55e303ae | 85 | mr r5,r3 /* Save the increment */ |
| 1c79356b | 86 | .L_AAretry: |
| 55e303ae A |
87 | lwarx r3, 0, r4 /* Grab the area value */ |
| 88 | add r6, r3, r5 /* Add the value */ | |
| 89 | stwcx. r6, 0, r4 /* Try to save the new value */ | |
| 90 | bne- .L_AAretry /* Didn't get it, try again... */ | |
| 91 | blr /* Return the original value */ |