osfmk/ppc/commpage/mach_absolute_time.s

   1 /*
   2  * Copyright (c) 2003 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 #define ASSEMBLER
  30 #include <sys/appleapiopts.h>
  31 #include <ppc/asm.h>                                    // EXT, LEXT
  32 #include <machine/cpu_capabilities.h>
  33 #include <machine/commpage.h>
  34
  35         .text
  36         .align  2
  37
  38
  39 // *********************************************
  40 // * M A C H _ A B S O L U T E _ T I M E _ 3 2 *
  41 // *********************************************
  42
  43 mach_absolute_time_32:
  44 1:
  45         mftbu   r3
  46         mftb    r4
  47         mftbu   r5
  48         cmplw   r3,r5
  49         beqlr+
  50         b               1b
  51
  52         COMMPAGE_DESCRIPTOR(mach_absolute_time_32,_COMM_PAGE_ABSOLUTE_TIME,0,k64Bit,kCommPage32)
  53
  54
  55 // *********************************************
  56 // * M A C H _ A B S O L U T E _ T I M E _ 6 4 *
  57 // *********************************************
  58 //
  59 // This is the version that is called in 32-bit mode, so we return the TBR in r3 and r4.
  60
  61 mach_absolute_time_64:
  62         mftb    r4
  63         srdi    r3,r4,32
  64         blr
  65
  66         COMMPAGE_DESCRIPTOR(mach_absolute_time_64,_COMM_PAGE_ABSOLUTE_TIME,k64Bit,0,kCommPage32)
  67
  68
  69 // *************************************************
  70 // * M A C H _ A B S O L U T E _ T I M E _ L P 6 4 *
  71 // *************************************************
  72 //
  73 // This is the version that is called in 64-bit mode, so we return the TBR in r3.
  74
  75 mach_absolute_time_lp64:
  76         mftb    r3
  77         blr
  78
  79         COMMPAGE_DESCRIPTOR(mach_absolute_time_lp64,_COMM_PAGE_ABSOLUTE_TIME,k64Bit,0,kCommPage64)
  80
  81