vdso.h revision 331722 
1/*-
2 * Copyright 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 ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: stable/11/sys/sys/vdso.h 331722 2018-03-29 02:50:57Z eadler $
26 */
27
28#ifndef _SYS_VDSO_H
29#define	_SYS_VDSO_H
30
31#include <sys/types.h>
32#include <machine/vdso.h>
33
34struct vdso_timehands {
35	uint32_t	th_algo;
36	uint32_t	th_gen;
37	uint64_t	th_scale;
38	uint32_t 	th_offset_count;
39	uint32_t	th_counter_mask;
40	struct bintime	th_offset;
41	struct bintime	th_boottime;
42	VDSO_TIMEHANDS_MD
43};
44
45struct vdso_timekeep {
46	uint32_t	tk_ver;
47	uint32_t	tk_enabled;
48	uint32_t	tk_current;
49	struct vdso_timehands	tk_th[];
50};
51
52#define	VDSO_TK_CURRENT_BUSY	0xffffffff
53#define	VDSO_TK_VER_1		0x1
54#define	VDSO_TK_VER_CURR	VDSO_TK_VER_1
55#define	VDSO_TH_ALGO_1		0x1
56#define	VDSO_TH_ALGO_2		0x2
57#define	VDSO_TH_ALGO_3		0x3
58#define	VDSO_TH_ALGO_4		0x4
59
60#ifndef _KERNEL
61
62struct timespec;
63struct timeval;
64struct timezone;
65
66int __vdso_clock_gettime(clockid_t clock_id, struct timespec *ts);
67int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz);
68int __vdso_gettc(const struct vdso_timehands *vdso_th, u_int *tc);
69int __vdso_gettimekeep(struct vdso_timekeep **tk);
70
71#endif
72
73#ifdef _KERNEL
74
75struct timecounter;
76
77struct vdso_sv_tk {
78	int		sv_timekeep_off;
79	int		sv_timekeep_curr;
80	uint32_t	sv_timekeep_gen;
81};
82
83void timekeep_push_vdso(void);
84
85uint32_t tc_fill_vdso_timehands(struct vdso_timehands *vdso_th);
86
87/*
88 * The cpu_fill_vdso_timehands() function should fill MD-part of the
89 * struct vdso_timehands, which is both machine- and
90 * timecounter-depended. The return value should be 1 if fast
91 * userspace timecounter is enabled by hardware, and 0 otherwise. The
92 * global sysctl enable override is handled by machine-independed code
93 * after cpu_fill_vdso_timehands() call is made.
94 */
95uint32_t cpu_fill_vdso_timehands(struct vdso_timehands *vdso_th,
96    struct timecounter *tc);
97
98struct vdso_sv_tk *alloc_sv_tk(void);
99
100#define	VDSO_TH_NUM	4
101
102#ifdef COMPAT_FREEBSD32
103struct bintime32 {
104	uint32_t	sec;
105	uint32_t	frac[2];
106};
107
108struct vdso_timehands32 {
109	uint32_t	th_algo;
110	uint32_t	th_gen;
111	uint32_t	th_scale[2];
112	uint32_t 	th_offset_count;
113	uint32_t	th_counter_mask;
114	struct bintime32	th_offset;
115	struct bintime32	th_boottime;
116	VDSO_TIMEHANDS_MD32
117};
118
119struct vdso_timekeep32 {
120	uint32_t	tk_ver;
121	uint32_t	tk_enabled;
122	uint32_t	tk_current;
123	struct vdso_timehands32	tk_th[];
124};
125
126uint32_t tc_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32);
127uint32_t cpu_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32,
128    struct timecounter *tc);
129struct vdso_sv_tk *alloc_sv_tk_compat32(void);
130
131#endif
132#endif
133
134#endif
135