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Annotation of kernel/driverkit/ppc/IOAsmSupport.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25:  /*
        !            26:  * Copyright (c) 1997 Apple Computer, Inc.
        !            27:  *
        !            28:  *
        !            29:  * HISTORY
        !            30:  *
        !            31:  * Simon Douglas  22 Oct 97
        !            32:  * - first checked in. From DriverServices
        !            33:  */
        !            34: 
        !            35: 
        !            36: #include <ppc/asm.h>
        !            37: #include <ppc/proc_reg.h>
        !            38: #include <mach/ppc/vm_param.h>
        !            39: #include <assym.h>
        !            40: 
        !            41: 
        !            42: /*
        !            43: Boolean _eCompareAndSwap(
        !            44:            UInt32 old, UInt32 new, UInt32 * result )
        !            45: */
        !            46: 
        !            47: 
        !            48: ENTRY(_eCompareAndSwap, TAG_NO_FRAME_USED)
        !            49: 
        !            50: .L_retry:
        !            51:        lwarx   r6,     0,r5
        !            52:        cmpw    r6,     r3
        !            53:        bne-    .L_fail
        !            54:        sync                            /* bug fix for 3.2 processors */
        !            55:        stwcx.  r4,     0,r5
        !            56:        bne-    .L_retry
        !            57:        isync
        !            58:        li      r3,     1
        !            59:        blr
        !            60: .L_fail:
        !            61:        li      r3,     0
        !            62:        blr
        !            63: 
        !            64: ENTRY(_eSynchronizeIO, TAG_NO_FRAME_USED)
        !            65: 
        !            66:        li      r0,     0
        !            67:        eieio
        !            68:        li      r3,     0
        !            69:        blr
        !            70: 
        !            71: /*
        !            72: 
        !            73: OSStatus CallTVector_NoRecover(
        !            74:            void * p1, void * p2, void * p3, void * p4, void * p5, void * p6,   // r3-8
        !            75:            LogicalAddress entry )                                              // r9
        !            76: 
        !            77: */
        !            78: 
        !            79: #define PARAM_SIZE     24
        !            80: 
        !            81: #if 0
        !            82: 0x5231204:  lwz     r12,0x000c(r2)
        !            83: 0x5231208:  stw     r2,0x0014(r1)
        !            84: 0x523120c:  lwz     r0,0x0000(r12)
        !            85: 0x5231210:  lwz     r2,0x0004(r12)
        !            86: 0x5231214:  mtspr   ctr,r0
        !            87: 0x5231218:  bctr
        !            88: #endif
        !            89: 
        !            90: ENTRY(CallTVector_NoRecover, TAG_NO_FRAME_USED)
        !            91: 
        !            92:        mflr    r0
        !            93:        stw     r0,     FM_LR_SAVE(r1)
        !            94:        stw     r2,     FM_TOC_SAVE(r1)
        !            95: 
        !            96:        stwu    r1,     -(PARAM_SIZE+FM_SIZE)(r1)
        !            97: 
        !            98:        lwz     r2,     4(r9)
        !            99:        lwz     r0,     0(r9)
        !           100:        mtspr   lr,     r0
        !           101:        mfspr   r12,    lr
        !           102:        blrl
        !           103: 
        !           104:        addi    r1,     r1,(PARAM_SIZE+FM_SIZE)
        !           105:        lwz     r2,     FM_TOC_SAVE(r1)
        !           106:        lwz     r0,     FM_LR_SAVE(r1)
        !           107:        mtlr    r0
        !           108:        blr
        !           109: 
        !           110: 
        !           111: 

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