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  * 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
  54 OSStatus SynchronizeIO( void )
  55
  56 */
  57
  58         ENTRY   __eSynchronizeIO
  59
  60         li      r0,     0
  61         eieio
  62         li      r3,     0
  63         blr
  64
  65 /*
  66
  67 OSStatus CallTVector_NoRecover(
  68             void * p1, void * p2, void * p3, void * p4, void * p5, void * p6,   // r3-8
  69             LogicalAddress entry )                                              // r9
  70
  71 */
  72
  73 #define PARAM_SIZE      24
  74 #define FM_SIZE         64
  75 #define FM_LR_SAVE      8
  76 #define FM_TOC_SAVE     20
  77
  78         ENTRY   _CallTVector
  79
  80 #if 1
  81         stw     r2,     FM_TOC_SAVE(r1)
  82         lwz     r0,     0(r9)
  83         lwz     r2,     4(r9)
  84         mtspr   ctr,    r0
  85         bctr
  86
  87 #else
  88         mflr    r0
  89         stw     r0,     FM_LR_SAVE(r1)
  90         stw     r2,     FM_TOC_SAVE(r1)
  91
  92         stwu    r1,     -(PARAM_SIZE+FM_SIZE)(r1)
  93
  94         lwz     r2,     4(r9)
  95         lwz     r0,     0(r9)
  96         mtspr   lr,     r0
  97         mfspr   r12,    lr
  98         blrl
  99
 100         addi    r1,     r1,(PARAM_SIZE+FM_SIZE)
 101         lwz     r2,     FM_TOC_SAVE(r1)
 102         lwz     r0,     FM_LR_SAVE(r1)
 103         mtlr    r0
 104         blr
 105 #endif
 106
 107 /*
 108  * Seemingly unused references from cpp statically initialized objects.
 109  */
 110
 111 .globl .constructors_used
 112 .constructors_used = 0
 113 .globl .destructors_used
 114 .destructors_used = 0