include/uapi/linux/timex.h

   1 /*****************************************************************************
   2  *                                                                           *
   3  * Copyright (c) David L. Mills 1993                                         *
   4  *                                                                           *
   5  * Permission to use, copy, modify, and distribute this software and its     *
   6  * documentation for any purpose and without fee is hereby granted, provided *
   7  * that the above copyright notice appears in all copies and that both the   *
   8  * copyright notice and this permission notice appear in supporting          *
   9  * documentation, and that the name University of Delaware not be used in    *
  10  * advertising or publicity pertaining to distribution of the software       *
  11  * without specific, written prior permission.  The University of Delaware   *
  12  * makes no representations about the suitability this software for any      *
  13  * purpose.  It is provided "as is" without express or implied warranty.     *
  14  *                                                                           *
  15  *****************************************************************************/
  16
  17 /*
  18  * Modification history timex.h
  19  *
  20  * 29 Dec 97    Russell King
  21  *      Moved CLOCK_TICK_RATE, CLOCK_TICK_FACTOR and FINETUNE to asm/timex.h
  22  *      for ARM machines
  23  *
  24  *  9 Jan 97    Adrian Sun
  25  *      Shifted LATCH define to allow access to alpha machines.
  26  *
  27  * 26 Sep 94    David L. Mills
  28  *      Added defines for hybrid phase/frequency-lock loop.
  29  *
  30  * 19 Mar 94    David L. Mills
  31  *      Moved defines from kernel routines to header file and added new
  32  *      defines for PPS phase-lock loop.
  33  *
  34  * 20 Feb 94    David L. Mills
  35  *      Revised status codes and structures for external clock and PPS
  36  *      signal discipline.
  37  *
  38  * 28 Nov 93    David L. Mills
  39  *      Adjusted parameters to improve stability and increase poll
  40  *      interval.
  41  *
  42  * 17 Sep 93    David L. Mills
  43  *      Created file $NTP/include/sys/timex.h
  44  * 07 Oct 93    Torsten Duwe
  45  *      Derived linux/timex.h
  46  * 1995-08-13    Torsten Duwe
  47  *      kernel PLL updated to 1994-12-13 specs (rfc-1589)
  48  * 1997-08-30    Ulrich Windl
  49  *      Added new constant NTP_PHASE_LIMIT
  50  * 2004-08-12    Christoph Lameter
  51  *      Reworked time interpolation logic
  52  */
  53 #ifndef _UAPI_LINUX_TIMEX_H
  54 #define _UAPI_LINUX_TIMEX_H
  55
  56 #include <linux/time.h>
  57
  58 #define NTP_API         4       /* NTP API version */
  59
  60 /*
  61  * syscall interface - used (mainly by NTP daemon)
  62  * to discipline kernel clock oscillator
  63  */
  64 struct timex {
  65         unsigned int modes;     /* mode selector */
  66         __kernel_long_t offset; /* time offset (usec) */
  67         __kernel_long_t freq;   /* frequency offset (scaled ppm) */
  68         __kernel_long_t maxerror;/* maximum error (usec) */
  69         __kernel_long_t esterror;/* estimated error (usec) */
  70         int status;             /* clock command/status */
  71         __kernel_long_t constant;/* pll time constant */
  72         __kernel_long_t precision;/* clock precision (usec) (read only) */
  73         __kernel_long_t tolerance;/* clock frequency tolerance (ppm)
  74                                    * (read only)
  75                                    */
  76         struct timeval time;    /* (read only, except for ADJ_SETOFFSET) */
  77         __kernel_long_t tick;   /* (modified) usecs between clock ticks */
  78
  79         __kernel_long_t ppsfreq;/* pps frequency (scaled ppm) (ro) */
  80         __kernel_long_t jitter; /* pps jitter (us) (ro) */
  81         int shift;              /* interval duration (s) (shift) (ro) */
  82         __kernel_long_t stabil;            /* pps stability (scaled ppm) (ro) */
  83         __kernel_long_t jitcnt; /* jitter limit exceeded (ro) */
  84         __kernel_long_t calcnt; /* calibration intervals (ro) */
  85         __kernel_long_t errcnt; /* calibration errors (ro) */
  86         __kernel_long_t stbcnt; /* stability limit exceeded (ro) */
  87
  88         int tai;                /* TAI offset (ro) */
  89
  90         int  :32; int  :32; int  :32; int  :32;
  91         int  :32; int  :32; int  :32; int  :32;
  92         int  :32; int  :32; int  :32;
  93 };
  94
  95 /*
  96  * Mode codes (timex.mode)
  97  */
  98 #define ADJ_OFFSET              0x0001  /* time offset */
  99 #define ADJ_FREQUENCY           0x0002  /* frequency offset */
 100 #define ADJ_MAXERROR            0x0004  /* maximum time error */
 101 #define ADJ_ESTERROR            0x0008  /* estimated time error */
 102 #define ADJ_STATUS              0x0010  /* clock status */
 103 #define ADJ_TIMECONST           0x0020  /* pll time constant */
 104 #define ADJ_TAI                 0x0080  /* set TAI offset */
 105 #define ADJ_SETOFFSET           0x0100  /* add 'time' to current time */
 106 #define ADJ_MICRO               0x1000  /* select microsecond resolution */
 107 #define ADJ_NANO                0x2000  /* select nanosecond resolution */
 108 #define ADJ_TICK                0x4000  /* tick value */
 109
 110 #ifndef __KERNEL__
 111 #define ADJ_OFFSET_SINGLESHOT   0x8001  /* old-fashioned adjtime */
 112 #define ADJ_OFFSET_SS_READ      0xa001  /* read-only adjtime */
 113 #endif
 114
 115 /* NTP userland likes the MOD_ prefix better */
 116 #define MOD_OFFSET      ADJ_OFFSET
 117 #define MOD_FREQUENCY   ADJ_FREQUENCY
 118 #define MOD_MAXERROR    ADJ_MAXERROR
 119 #define MOD_ESTERROR    ADJ_ESTERROR
 120 #define MOD_STATUS      ADJ_STATUS
 121 #define MOD_TIMECONST   ADJ_TIMECONST
 122 #define MOD_TAI ADJ_TAI
 123 #define MOD_MICRO       ADJ_MICRO
 124 #define MOD_NANO        ADJ_NANO
 125
 126
 127 /*
 128  * Status codes (timex.status)
 129  */
 130 #define STA_PLL         0x0001  /* enable PLL updates (rw) */
 131 #define STA_PPSFREQ     0x0002  /* enable PPS freq discipline (rw) */
 132 #define STA_PPSTIME     0x0004  /* enable PPS time discipline (rw) */
 133 #define STA_FLL         0x0008  /* select frequency-lock mode (rw) */
 134
 135 #define STA_INS         0x0010  /* insert leap (rw) */
 136 #define STA_DEL         0x0020  /* delete leap (rw) */
 137 #define STA_UNSYNC      0x0040  /* clock unsynchronized (rw) */
 138 #define STA_FREQHOLD    0x0080  /* hold frequency (rw) */
 139
 140 #define STA_PPSSIGNAL   0x0100  /* PPS signal present (ro) */
 141 #define STA_PPSJITTER   0x0200  /* PPS signal jitter exceeded (ro) */
 142 #define STA_PPSWANDER   0x0400  /* PPS signal wander exceeded (ro) */
 143 #define STA_PPSERROR    0x0800  /* PPS signal calibration error (ro) */
 144
 145 #define STA_CLOCKERR    0x1000  /* clock hardware fault (ro) */
 146 #define STA_NANO        0x2000  /* resolution (0 = us, 1 = ns) (ro) */
 147 #define STA_MODE        0x4000  /* mode (0 = PLL, 1 = FLL) (ro) */
 148 #define STA_CLK         0x8000  /* clock source (0 = A, 1 = B) (ro) */
 149
 150 /* read-only bits */
 151 #define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | \
 152         STA_PPSERROR | STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)
 153
 154 /*
 155  * Clock states (time_state)
 156  */
 157 #define TIME_OK         0       /* clock synchronized, no leap second */
 158 #define TIME_INS        1       /* insert leap second */
 159 #define TIME_DEL        2       /* delete leap second */
 160 #define TIME_OOP        3       /* leap second in progress */
 161 #define TIME_WAIT       4       /* leap second has occurred */
 162 #define TIME_ERROR      5       /* clock not synchronized */
 163 #define TIME_BAD        TIME_ERROR /* bw compat */
 164
 165
 166 #endif /* _UAPI_LINUX_TIMEX_H */