iokit/Kernel/ppc/IOAsmSupport.s

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25  /*
  26  * Copyright (c) 1997-1998 Apple Computer, Inc.
  27  *
  28  *
  29  * HISTORY
  30  *
  31  * sdouglas  22 Oct 97 - first checked in from DriverServices
  32  * sdouglas  28 Jul 98 - start IOKit
  33  */
  34
  35 #include <architecture/ppc/asm_help.h>
  36
  37 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  38 ;
  39 ; ENTRY         functionName
  40 ;
  41 ; Assembly directives to begin an exported function.
  42 ;
  43 ; Takes: functionName - name of the exported function
  44 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  45
  46 .macro ENTRY
  47         .text
  48         .align          2
  49         .globl          $0
  50 $0:
  51 .endmacro
  52
  53 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  54
  55 /*
  56
  57 OSStatus SynchronizeIO( void )
  58
  59 */
  60
  61         ENTRY   __eSynchronizeIO
  62
  63         li      r0,     0
  64         eieio
  65         li      r3,     0
  66         blr
  67
  68 /*
  69
  70 OSStatus CallTVector_NoRecover(
  71             void * p1, void * p2, void * p3, void * p4, void * p5, void * p6,   // r3-8
  72             LogicalAddress entry )                                              // r9
  73
  74 */
  75
  76 #define PARAM_SIZE      24
  77 #define FM_SIZE         64
  78 #define FM_LR_SAVE      8
  79 #define FM_TOC_SAVE     20
  80
  81         ENTRY   _CallTVector
  82
  83 #if 1
  84         stw     r2,     FM_TOC_SAVE(r1)
  85         lwz     r0,     0(r9)
  86         lwz     r2,     4(r9)
  87         mtspr   ctr,    r0
  88         bctr
  89
  90 #else
  91         mflr    r0
  92         stw     r0,     FM_LR_SAVE(r1)
  93         stw     r2,     FM_TOC_SAVE(r1)
  94
  95         stwu    r1,     -(PARAM_SIZE+FM_SIZE)(r1)
  96
  97         lwz     r2,     4(r9)
  98         lwz     r0,     0(r9)
  99         mtspr   lr,     r0
 100         mfspr   r12,    lr
 101         blrl
 102
 103         addi    r1,     r1,(PARAM_SIZE+FM_SIZE)
 104         lwz     r2,     FM_TOC_SAVE(r1)
 105         lwz     r0,     FM_LR_SAVE(r1)
 106         mtlr    r0
 107         blr
 108 #endif
 109
 110 /*
 111  * Seemingly unused references from cpp statically initialized objects.
 112  */
 113
 114 .globl .constructors_used
 115 .constructors_used = 0
 116 .globl .destructors_used
 117 .destructors_used = 0