1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
5 * All rights reserved.
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 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#ifndef __MACHINE_COUNTER_H__
32#define __MACHINE_COUNTER_H__
33
34#include <sys/pcpu.h>
35
36#define	EARLY_COUNTER	&temp_bsp_pcpu.pc_early_dummy_counter
37
38#define	counter_enter()	do {} while (0)
39#define	counter_exit()	do {} while (0)
40
41#ifdef IN_SUBR_COUNTER_C
42static inline uint64_t
43counter_u64_read_one(uint64_t *p, int cpu)
44{
45
46	return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
47}
48
49static inline uint64_t
50counter_u64_fetch_inline(uint64_t *p)
51{
52	uint64_t r;
53	int i;
54
55	r = 0;
56	CPU_FOREACH(i)
57		r += counter_u64_read_one((uint64_t *)p, i);
58
59	return (r);
60}
61
62static void
63counter_u64_zero_one_cpu(void *arg)
64{
65
66	*((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
67	    PCPU_GET(cpuid))) = 0;
68}
69
70static inline void
71counter_u64_zero_inline(counter_u64_t c)
72{
73
74	smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
75	    smp_no_rendezvous_barrier, c);
76}
77#endif
78
79#define	counter_u64_add_protected(c, i)	counter_u64_add(c, i)
80
81static inline void
82counter_u64_add(counter_u64_t c, int64_t inc)
83{
84
85	KASSERT(IS_BSP() || c != EARLY_COUNTER, ("EARLY_COUNTER used on AP"));
86	__asm __volatile("addq\t%1,%%gs:(%0)"
87	    :
88	    : "r" ((char *)c - (char *)&__pcpu[0]), "ri" (inc)
89	    : "memory", "cc");
90}
91
92#endif	/* ! __MACHINE_COUNTER_H__ */
93