/*
 * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 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)