1/*- 2 * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: stable/11/sys/amd64/include/counter.h 328386 2018-01-25 02:45:21Z pkelsey $ 27 */ 28 29#ifndef __MACHINE_COUNTER_H__ 30#define __MACHINE_COUNTER_H__ 31 32#include <sys/pcpu.h> 33 34extern struct pcpu __pcpu[1]; 35 36#define counter_enter() do {} while (0) 37#define counter_exit() do {} while (0) 38 39#ifdef IN_SUBR_COUNTER_C 40static inline uint64_t 41counter_u64_read_one(uint64_t *p, int cpu) 42{ 43 44 return (*(uint64_t *)((char *)p + sizeof(struct pcpu) * cpu)); 45} 46 47static inline uint64_t 48counter_u64_fetch_inline(uint64_t *p) 49{ 50 uint64_t r; 51 int i; 52 53 r = 0; 54 CPU_FOREACH(i) 55 r += counter_u64_read_one((uint64_t *)p, i); 56 57 return (r); 58} 59 60static void 61counter_u64_zero_one_cpu(void *arg) 62{ 63 64 *((uint64_t *)((char *)arg + sizeof(struct pcpu) * 65 PCPU_GET(cpuid))) = 0; 66} 67 68static inline void 69counter_u64_zero_inline(counter_u64_t c) 70{ 71 72 smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu, 73 smp_no_rendezvous_barrier, c); 74} 75#endif 76 77#define counter_u64_add_protected(c, i) counter_u64_add(c, i) 78 79static inline void 80counter_u64_add(counter_u64_t c, int64_t inc) 81{ 82 83 __asm __volatile("addq\t%1,%%gs:(%0)" 84 : 85 : "r" ((char *)c - (char *)&__pcpu[0]), "ri" (inc) 86 : "memory", "cc"); 87} 88 89#endif /* ! __MACHINE_COUNTER_H__ */ 90