The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/vdso.h

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    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: stable/12/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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