projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 | 1 | /* |
| 5b2abdfb | 2 | * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. |
| e9ce8d39 A |
3 | * |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 734aad71 | 5 | * |
| 734aad71 A |
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 | |
| e9ce8d39 A |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 734aad71 A |
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 | * | |
| 5b2abdfb | 21 | * @APPLE_LICENSE_HEADER_END@ |
| e9ce8d39 | 22 | */ |
| 5b2abdfb A |
23 | #if !defined(__ppc__) |
| 24 | #include <stdint.h> | |
| 25 | #include <mach/clock.h> | |
| 9385eb3d | 26 | #include <mach/mach_time.h> |
| e9ce8d39 | 27 | |
| 5b2abdfb | 28 | extern mach_port_t clock_port; |
| e9ce8d39 | 29 | |
| 9385eb3d A |
30 | inline static uint64_t |
| 31 | fast_get_nano_from_abs(int scale) | |
| 32 | { | |
| 33 | uint64_t value; | |
| 34 | asm ( | |
| 35 | "rdtsc \n\t" | |
| 36 | "movl %%edx,%%esi \n\t" | |
| 37 | "mull %%ecx \n\t" | |
| 38 | "movl %%edx,%%edi \n\t" | |
| 39 | "movl %%esi,%%eax \n\t" | |
| 40 | "mull %%ecx \n\t" | |
| 41 | "xorl %%ecx,%%ecx \n\t" | |
| 42 | "addl %%edi,%%eax \n\t" | |
| 43 | "adcl %%ecx,%%edx " | |
| 44 | : "=A"(value) : "c"(scale) : "%esi", "%edi"); | |
| 45 | return value; | |
| 46 | } | |
| 47 | ||
| 48 | uint64_t | |
| 49 | mach_absolute_time(void) { | |
| 50 | static int scale = 0; | |
| 51 | ||
| 52 | if (__builtin_expect(scale == 0, 0)) { | |
| 53 | mach_timebase_info_data_t info; | |
| 54 | mach_timebase_info(&info); | |
| 55 | scale = info.numer; | |
| 56 | } | |
| 57 | if (__builtin_expect(scale == 1, 0)) { | |
| 58 | mach_timespec_t now; | |
| 59 | (void)clock_get_time(clock_port, &now); | |
| 60 | return (uint64_t)now.tv_sec * NSEC_PER_SEC + now.tv_nsec; | |
| 61 | } | |
| 62 | return fast_get_nano_from_abs(scale); | |
| e9ce8d39 | 63 | } |
| 5b2abdfb | 64 | #endif |