pexpert/ppc/pe_misc.s

   1 /*
   2  * Copyright (c) 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 #include <mach/ppc/asm.h>
  26
  27 /*
  28 **      PE_get_timebase()
  29 **
  30 **      Entry   - R3 contains pointer to 64 bit structure.
  31 **
  32 **      Exit    - 64 bit structure filled in.
  33 **
  34 */
  35 ENTRY(PE_get_timebase, TAG_NO_FRAME_USED)
  36 loop:
  37         mftbu   r4
  38         mftb    r5
  39         mftbu   r6
  40         cmpw    r6, r4
  41         bne     loop
  42
  43         stw     r4, 0(r3)
  44         stw     r5, 4(r3)
  45
  46         blr
  47
  48
  49