projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
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 |