FreeBSD/Linux Kernel Cross Reference
sys/sys/vdso.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright 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 ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * $FreeBSD: releng/12.0/sys/sys/vdso.h 326256 2017-11-27 15:01:59Z pfg $
28 */
29
30 #ifndef _SYS_VDSO_H
31 #define _SYS_VDSO_H
32
33 #include <sys/types.h>
34 #include <machine/vdso.h>
35
36 struct vdso_timehands {
37 uint32_t th_algo;
38 uint32_t th_gen;
39 uint64_t th_scale;
40 uint32_t th_offset_count;
41 uint32_t th_counter_mask;
42 struct bintime th_offset;
43 struct bintime th_boottime;
44 VDSO_TIMEHANDS_MD
45 };
46
47 struct vdso_timekeep {
48 uint32_t tk_ver;
49 uint32_t tk_enabled;
50 uint32_t tk_current;
51 struct vdso_timehands tk_th[];
52 };
53
54 #define VDSO_TK_CURRENT_BUSY 0xffffffff
55 #define VDSO_TK_VER_1 0x1
56 #define VDSO_TK_VER_CURR VDSO_TK_VER_1
57 #define VDSO_TH_ALGO_1 0x1
58 #define VDSO_TH_ALGO_2 0x2
59 #define VDSO_TH_ALGO_3 0x3
60 #define VDSO_TH_ALGO_4 0x4
61
62 #ifndef _KERNEL
63
64 struct timespec;
65 struct timeval;
66 struct timezone;
67
68 int __vdso_clock_gettime(clockid_t clock_id, struct timespec *ts);
69 int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz);
70 int __vdso_gettc(const struct vdso_timehands *vdso_th, u_int *tc);
71 int __vdso_gettimekeep(struct vdso_timekeep **tk);
72
73 #endif
74
75 #ifdef _KERNEL
76
77 struct timecounter;
78
79 struct vdso_sv_tk {
80 int sv_timekeep_off;
81 int sv_timekeep_curr;
82 uint32_t sv_timekeep_gen;
83 };
84
85 void timekeep_push_vdso(void);
86
87 uint32_t tc_fill_vdso_timehands(struct vdso_timehands *vdso_th);
88
89 /*
90 * The cpu_fill_vdso_timehands() function should fill MD-part of the
91 * struct vdso_timehands, which is both machine- and
92 * timecounter-depended. The return value should be 1 if fast
93 * userspace timecounter is enabled by hardware, and 0 otherwise. The
94 * global sysctl enable override is handled by machine-independed code
95 * after cpu_fill_vdso_timehands() call is made.
96 */
97 uint32_t cpu_fill_vdso_timehands(struct vdso_timehands *vdso_th,
98 struct timecounter *tc);
99
100 struct vdso_sv_tk *alloc_sv_tk(void);
101
102 #define VDSO_TH_NUM 4
103
104 #ifdef COMPAT_FREEBSD32
105 struct bintime32 {
106 uint32_t sec;
107 uint32_t frac[2];
108 };
109
110 struct vdso_timehands32 {
111 uint32_t th_algo;
112 uint32_t th_gen;
113 uint32_t th_scale[2];
114 uint32_t th_offset_count;
115 uint32_t th_counter_mask;
116 struct bintime32 th_offset;
117 struct bintime32 th_boottime;
118 VDSO_TIMEHANDS_MD32
119 };
120
121 struct vdso_timekeep32 {
122 uint32_t tk_ver;
123 uint32_t tk_enabled;
124 uint32_t tk_current;
125 struct vdso_timehands32 tk_th[];
126 };
127
128 uint32_t tc_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32);
129 uint32_t cpu_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32,
130 struct timecounter *tc);
131 struct vdso_sv_tk *alloc_sv_tk_compat32(void);
132
133 #endif
134 #endif
135
136 #endif
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