iokit/Kernel/ppc/IOAsmSupport.s

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30  /*
  31  * Copyright (c) 1997-1998 Apple Computer, Inc.
  32  *
  33  *
  34  * HISTORY
  35  *
  36  * sdouglas  22 Oct 97 - first checked in from DriverServices
  37  * sdouglas  28 Jul 98 - start IOKit
  38  */
  39
  40 #include <architecture/ppc/asm_help.h>
  41
  42 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  43 ;
  44 ; ENTRY         functionName
  45 ;
  46 ; Assembly directives to begin an exported function.
  47 ;
  48 ; Takes: functionName - name of the exported function
  49 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  50
  51 .macro ENTRY
  52         .text
  53         .align          2
  54         .globl          $0
  55 $0:
  56 .endmacro
  57
  58 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  59
  60 /*
  61
  62 OSStatus SynchronizeIO( void )
  63
  64 */
  65
  66         ENTRY   __eSynchronizeIO
  67
  68         li      r0,     0
  69         eieio
  70         li      r3,     0
  71         blr
  72
  73 /*
  74
  75 OSStatus CallTVector_NoRecover(
  76             void * p1, void * p2, void * p3, void * p4, void * p5, void * p6,   // r3-8
  77             LogicalAddress entry )                                              // r9
  78
  79 */
  80
  81 #define PARAM_SIZE      24
  82 #define FM_SIZE         64
  83 #define FM_LR_SAVE      8
  84 #define FM_TOC_SAVE     20
  85
  86         ENTRY   _CallTVector
  87
  88 #if 1
  89         stw     r2,     FM_TOC_SAVE(r1)
  90         lwz     r0,     0(r9)
  91         lwz     r2,     4(r9)
  92         mtspr   ctr,    r0
  93         bctr
  94
  95 #else
  96         mflr    r0
  97         stw     r0,     FM_LR_SAVE(r1)
  98         stw     r2,     FM_TOC_SAVE(r1)
  99
 100         stwu    r1,     -(PARAM_SIZE+FM_SIZE)(r1)
 101
 102         lwz     r2,     4(r9)
 103         lwz     r0,     0(r9)
 104         mtspr   lr,     r0
 105         mfspr   r12,    lr
 106         blrl
 107
 108         addi    r1,     r1,(PARAM_SIZE+FM_SIZE)
 109         lwz     r2,     FM_TOC_SAVE(r1)
 110         lwz     r0,     FM_LR_SAVE(r1)
 111         mtlr    r0
 112         blr
 113 #endif
 114
 115 /*
 116  * Seemingly unused references from cpp statically initialized objects.
 117  */
 118
 119 .globl .constructors_used
 120 .constructors_used = 0
 121 .globl .destructors_used
 122 .destructors_used = 0