iokit/Kernel/ppc/IOAsmSupport.s

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