pexpert/ppc/pe_misc.s

   1 /*
   2  * Copyright (c) 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 #include <mach/ppc/asm.h>
  23
  24 /*
  25 **      PE_get_timebase()
  26 **
  27 **      Entry   - R3 contains pointer to 64 bit structure.
  28 **
  29 **      Exit    - 64 bit structure filled in.
  30 **
  31 */
  32 ENTRY(PE_get_timebase, TAG_NO_FRAME_USED)
  33 loop:
  34         mftbu   r4
  35         mftb    r5
  36         mftbu   r6
  37         cmpw    r6, r4
  38         bne     loop
  39
  40         stw     r4, 0(r3)
  41         stw     r5, 4(r3)
  42
  43         blr
  44
  45
  46