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Annotation of kernel/driverkit/ppc/IOAsmSupport.s, revision 1.1.1.1

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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