FreeBSD/Linux Kernel Cross Reference
sys/sys/vdso.h
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: releng/11.2/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
34 struct 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
45 struct 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
62 struct timespec;
63 struct timeval;
64 struct timezone;
65
66 int __vdso_clock_gettime(clockid_t clock_id, struct timespec *ts);
67 int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz);
68 int __vdso_gettc(const struct vdso_timehands *vdso_th, u_int *tc);
69 int __vdso_gettimekeep(struct vdso_timekeep **tk);
70
71 #endif
72
73 #ifdef _KERNEL
74
75 struct timecounter;
76
77 struct vdso_sv_tk {
78 int sv_timekeep_off;
79 int sv_timekeep_curr;
80 uint32_t sv_timekeep_gen;
81 };
82
83 void timekeep_push_vdso(void);
84
85 uint32_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 */
95 uint32_t cpu_fill_vdso_timehands(struct vdso_timehands *vdso_th,
96 struct timecounter *tc);
97
98 struct vdso_sv_tk *alloc_sv_tk(void);
99
100 #define VDSO_TH_NUM 4
101
102 #ifdef COMPAT_FREEBSD32
103 struct bintime32 {
104 uint32_t sec;
105 uint32_t frac[2];
106 };
107
108 struct 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
119 struct 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
126 uint32_t tc_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32);
127 uint32_t cpu_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32,
128 struct timecounter *tc);
129 struct vdso_sv_tk *alloc_sv_tk_compat32(void);
130
131 #endif
132 #endif
133
134 #endif
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