1 /* 2 * Copyright (c) 2008 Apple Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23 #include <sys/types.h> 24 #include <machine/cpu_capabilities.h> 25 26 extern uint64_t mach_absolute_time(void); 27 28 #if defined(__arm64__) || defined(__x86_64__) 29 30 uint64_t mach_approximate_time(void)31mach_approximate_time(void) 32 { 33 if (COMM_PAGE_READ(uint8_t, APPROX_TIME_SUPPORTED)) { 34 return COMM_PAGE_READ(uint64_t, APPROX_TIME); 35 } 36 return mach_absolute_time(); 37 } 38 39 #endif 40