osfmk/ppc/commpage/mach_absolute_time.s

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #define ASSEMBLER
  25 #include <sys/appleapiopts.h>
  26 #include <ppc/asm.h>                                    // EXT, LEXT
  27 #include <machine/cpu_capabilities.h>
  28 #include <machine/commpage.h>
  29
  30         .text
  31         .align  2
  32
  33
  34 // *********************************************
  35 // * M A C H _ A B S O L U T E _ T I M E _ 3 2 *
  36 // *********************************************
  37
  38 mach_absolute_time_32:
  39 1:
  40         mftbu   r3
  41         mftb    r4
  42         mftbu   r5
  43         cmplw   r3,r5
  44         beqlr+
  45         b               1b
  46
  47         COMMPAGE_DESCRIPTOR(mach_absolute_time_32,_COMM_PAGE_ABSOLUTE_TIME,0,k64Bit,kCommPage32)
  48
  49
  50 // *********************************************
  51 // * M A C H _ A B S O L U T E _ T I M E _ 6 4 *
  52 // *********************************************
  53 //
  54 // This is the version that is called in 32-bit mode, so we return the TBR in r3 and r4.
  55
  56 mach_absolute_time_64:
  57         mftb    r4
  58         srdi    r3,r4,32
  59         blr
  60
  61         COMMPAGE_DESCRIPTOR(mach_absolute_time_64,_COMM_PAGE_ABSOLUTE_TIME,k64Bit,0,kCommPage32)
  62
  63
  64 // *************************************************
  65 // * M A C H _ A B S O L U T E _ T I M E _ L P 6 4 *
  66 // *************************************************
  67 //
  68 // This is the version that is called in 64-bit mode, so we return the TBR in r3.
  69
  70 mach_absolute_time_lp64:
  71         mftb    r3
  72         blr
  73
  74         COMMPAGE_DESCRIPTOR(mach_absolute_time_lp64,_COMM_PAGE_ABSOLUTE_TIME,k64Bit,0,kCommPage64)
  75
  76