/* * 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> extern mach_port_t clock_port; inline static uint64_t fast_get_nano_from_abs(int scale) { uint64_t value; asm ( "rdtsc \n\t" "movl %%edx,%%esi \n\t" "mull %%ecx \n\t" "movl %%edx,%%edi \n\t" "movl %%esi,%%eax \n\t" "mull %%ecx \n\t" "xorl %%ecx,%%ecx \n\t" "addl %%edi,%%eax \n\t" "adcl %%ecx,%%edx " : "=A"(value) : "c"(scale) : "%esi", "%edi"); return value; } uint64_t mach_absolute_time(void) { static int scale = 0; if (__builtin_expect(scale == 0, 0)) { mach_timebase_info_data_t info; mach_timebase_info(&info); scale = info.numer; } if (__builtin_expect(scale == 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 fast_get_nano_from_abs(scale); } #endif