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Annotation of XNU/libkern/ppc/OSAtomic.s, revision 1.1

1.1     ! root        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: 

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