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  * 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/11.1/sys/sys/vdso.h 311376 2017-01-05 07:42:08Z sephe $
   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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