xnu-792.12.6.tar.gz

[apple/xnu.git] / pexpert / ppc / pe_misc.s

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
 * 
 * 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.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * 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 
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 * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
 */
#include <mach/ppc/asm.h>

/* 
**      PE_get_timebase()
** 
**      Entry   - R3 contains pointer to 64 bit structure.
**
**      Exit    - 64 bit structure filled in.
**
*/
ENTRY(PE_get_timebase, TAG_NO_FRAME_USED)
loop:
        mftbu   r4
        mftb    r5
        mftbu   r6
        cmpw    r6, r4
        bne     loop
   
        stw     r4, 0(r3)
        stw     r5, 4(r3)

        blr