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