Libc-391.tar.gz

[apple/libc.git] / i386 / mach / mach_absolute_time.c

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_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. 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@
 */
#if !defined(__ppc__)
#include <stdint.h>
#include <mach/clock.h>
#include <mach/mach_time.h>
#define __APPLE_API_PRIVATE
#include <machine/cpu_capabilities.h>
#undef  __APPLE_API_PRIVATE

extern mach_port_t clock_port;

#define COMM_PAGE_VERSION \
	(*((short *) _COMM_PAGE_VERSION))
	
#define COMM_PAGE_NANOTIME() \
	(((uint64_t (*)()) _COMM_PAGE_NANOTIME)())

uint64_t
mach_absolute_time(void) {
        if (__builtin_expect(COMM_PAGE_VERSION == 1, 0)) {
                mach_timespec_t now;
                (void)clock_get_time(clock_port, &now);
                return (uint64_t)now.tv_sec * NSEC_PER_SEC + now.tv_nsec;
	}
	return COMM_PAGE_NANOTIME();
}
#endif