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/10.1/sys/sys/vdso.h 246117 2013-01-30 12:48:16Z kib $
   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 
   57 #ifndef _KERNEL
   58 
   59 struct timespec;
   60 struct timeval;
   61 struct timezone;
   62 
   63 int __vdso_clock_gettime(clockid_t clock_id, struct timespec *ts);
   64 int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz);
   65 u_int __vdso_gettc(const struct vdso_timehands *vdso_th);
   66 int __vdso_gettimekeep(struct vdso_timekeep **tk);
   67 
   68 #endif
   69 
   70 #ifdef _KERNEL
   71 
   72 void timekeep_push_vdso(void);
   73 
   74 uint32_t tc_fill_vdso_timehands(struct vdso_timehands *vdso_th);
   75 
   76 /*
   77  * The cpu_fill_vdso_timehands() function should fill MD-part of the
   78  * struct vdso_timehands, which is both machine- and
   79  * timecounter-depended. The return value should be 1 if fast
   80  * userspace timecounter is enabled by hardware, and 0 otherwise. The
   81  * global sysctl enable override is handled by machine-independed code
   82  * after cpu_fill_vdso_timehands() call is made.
   83  */
   84 uint32_t cpu_fill_vdso_timehands(struct vdso_timehands *vdso_th);
   85 
   86 #define VDSO_TH_NUM     4
   87 
   88 #ifdef COMPAT_FREEBSD32
   89 struct bintime32 {
   90         uint32_t        sec;
   91         uint32_t        frac[2];
   92 };
   93 
   94 struct vdso_timehands32 {
   95         uint32_t        th_algo;
   96         uint32_t        th_gen;
   97         uint32_t        th_scale[2];
   98         uint32_t        th_offset_count;
   99         uint32_t        th_counter_mask;
  100         struct bintime32        th_offset;
  101         struct bintime32        th_boottime;
  102         VDSO_TIMEHANDS_MD32
  103 };
  104 
  105 struct vdso_timekeep32 {
  106         uint32_t        tk_ver;
  107         uint32_t        tk_enabled;
  108         uint32_t        tk_current;
  109         struct vdso_timehands32 tk_th[];
  110 };
  111 
  112 uint32_t tc_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32);
  113 uint32_t cpu_fill_vdso_timehands32(struct vdso_timehands32 *vdso_th32);
  114 
  115 #endif
  116 #endif
  117 
  118 #endif

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