1 /* 2 * Copyright (c) 2014 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Sepherosa Ziehau <sepherosa@gmail.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef _SYS_MICROTIME_PCPU_H_ 36 #define _SYS_MICROTIME_PCPU_H_ 37 38 #ifndef _SYS_PARAM_H_ 39 #include <sys/param.h> 40 #endif 41 42 #ifndef _SYS_TIME_H_ 43 #include <sys/time.h> 44 #endif 45 46 #include <machine/clock.h> 47 #include <machine/cpufunc.h> 48 49 /* 50 * This 'time' only guarantees monotonicly increment on the same CPU 51 */ 52 53 union microtime_pcpu { 54 struct timeval tv; 55 uint64_t tsc; 56 }; 57 58 static __inline void 59 microtime_pcpu_get(union microtime_pcpu *t) 60 { 61 if (tsc_invariant) 62 t->tsc = rdtsc(); 63 else 64 microuptime(&t->tv); 65 } 66 67 static __inline int 68 microtime_pcpu_diff(const union microtime_pcpu *s, 69 const union microtime_pcpu *e) 70 { 71 if (tsc_invariant) { 72 return (((e->tsc - s->tsc) * 1000000) / tsc_frequency); 73 } else { 74 return ((e->tv.tv_usec - s->tv.tv_usec) + 75 (e->tv.tv_sec - s->tv.tv_sec) * 1000000); 76 } 77 } 78 79 #endif /* !_SYS_MICROTIME_PCPU_H_ */ 80