LXR darwin-xnu/pexpert/ppc/pe

   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*/
  32ENTRY(PE_get_timebase, TAG_NO_FRAME_USED)
  33loop:
  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
  47