mach_absolute_time.s [plain text]
/*
* Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#define ASSEMBLER
#include <sys/appleapiopts.h>
#include <ppc/asm.h> // EXT, LEXT
#include <machine/cpu_capabilities.h>
#include <machine/commpage.h>
.text
.align 2
.globl EXT(mach_absolute_time_32)
.globl EXT(mach_absolute_time_64)
// *********************************************
// * M A C H _ A B S O L U T E _ T I M E _ 3 2 *
// *********************************************
mach_absolute_time_32:
1:
mftbu r3
mftb r4
mftbu r5
cmplw r3,r5
beqlr+
b 1b
COMMPAGE_DESCRIPTOR(mach_absolute_time_32,_COMM_PAGE_ABSOLUTE_TIME,0,k64Bit,0)
// *********************************************
// * M A C H _ A B S O L U T E _ T I M E _ 6 4 *
// *********************************************
//
// Why bother to special case for 64-bit? Because the "mftb" variants
// are 10 cycles each, and they are serialized.
mach_absolute_time_64:
mftb r4
srdi r3,r4,32
blr
COMMPAGE_DESCRIPTOR(mach_absolute_time_64,_COMM_PAGE_ABSOLUTE_TIME,k64Bit,0,0)