1 /********************************************* 1 /***************************************************************************** 2 * 2 * * 3 * Copyright (c) David L. Mills 1993 3 * Copyright (c) David L. Mills 1993 * 4 * 4 * * 5 * Permission to use, copy, modify, and distri 5 * Permission to use, copy, modify, and distribute this software and its * 6 * documentation for any purpose and without f 6 * documentation for any purpose and without fee is hereby granted, provided * 7 * that the above copyright notice appears in 7 * that the above copyright notice appears in all copies and that both the * 8 * copyright notice and this permission notice 8 * copyright notice and this permission notice appear in supporting * 9 * documentation, and that the name University 9 * documentation, and that the name University of Delaware not be used in * 10 * advertising or publicity pertaining to dist 10 * advertising or publicity pertaining to distribution of the software * 11 * without specific, written prior permission. 11 * without specific, written prior permission. The University of Delaware * 12 * makes no representations about the suitabil 12 * makes no representations about the suitability this software for any * 13 * purpose. It is provided "as is" without ex 13 * purpose. It is provided "as is" without express or implied warranty. * 14 * 14 * * 15 ********************************************* 15 *****************************************************************************/ 16 16 17 /* 17 /* 18 * Modification history timex.h 18 * Modification history timex.h 19 * 19 * 20 * 29 Dec 97 Russell King 20 * 29 Dec 97 Russell King 21 * Moved CLOCK_TICK_RATE, CLOCK_TICK_FACT 21 * Moved CLOCK_TICK_RATE, CLOCK_TICK_FACTOR and FINETUNE to asm/timex.h 22 * for ARM machines 22 * for ARM machines 23 * 23 * 24 * 9 Jan 97 Adrian Sun 24 * 9 Jan 97 Adrian Sun 25 * Shifted LATCH define to allow access t 25 * Shifted LATCH define to allow access to alpha machines. 26 * 26 * 27 * 26 Sep 94 David L. Mills 27 * 26 Sep 94 David L. Mills 28 * Added defines for hybrid phase/frequen 28 * Added defines for hybrid phase/frequency-lock loop. 29 * 29 * 30 * 19 Mar 94 David L. Mills 30 * 19 Mar 94 David L. Mills 31 * Moved defines from kernel routines to 31 * Moved defines from kernel routines to header file and added new 32 * defines for PPS phase-lock loop. 32 * defines for PPS phase-lock loop. 33 * 33 * 34 * 20 Feb 94 David L. Mills 34 * 20 Feb 94 David L. Mills 35 * Revised status codes and structures fo 35 * Revised status codes and structures for external clock and PPS 36 * signal discipline. 36 * signal discipline. 37 * 37 * 38 * 28 Nov 93 David L. Mills 38 * 28 Nov 93 David L. Mills 39 * Adjusted parameters to improve stabili 39 * Adjusted parameters to improve stability and increase poll 40 * interval. 40 * interval. 41 * 41 * 42 * 17 Sep 93 David L. Mills 42 * 17 Sep 93 David L. Mills 43 * Created file $NTP/include/sys/timex.h 43 * Created file $NTP/include/sys/timex.h 44 * 07 Oct 93 Torsten Duwe 44 * 07 Oct 93 Torsten Duwe 45 * Derived linux/timex.h 45 * Derived linux/timex.h 46 * 1995-08-13 Torsten Duwe 46 * 1995-08-13 Torsten Duwe 47 * kernel PLL updated to 1994-12-13 specs 47 * kernel PLL updated to 1994-12-13 specs (rfc-1589) 48 * 1997-08-30 Ulrich Windl 48 * 1997-08-30 Ulrich Windl 49 * Added new constant NTP_PHASE_LIMIT 49 * Added new constant NTP_PHASE_LIMIT 50 * 2004-08-12 Christoph Lameter << 51 * Reworked time interpolation logic << 52 */ 50 */ 53 #ifndef _LINUX_TIMEX_H 51 #ifndef _LINUX_TIMEX_H 54 #define _LINUX_TIMEX_H 52 #define _LINUX_TIMEX_H 55 53 56 #include <uapi/linux/timex.h> !! 54 #include <asm/param.h> 57 55 58 #define ADJ_ADJTIME 0x8000 /* swi << 59 #define ADJ_OFFSET_SINGLESHOT 0x0001 /* old << 60 #define ADJ_OFFSET_READONLY 0x2000 /* rea << 61 #include <linux/compiler.h> << 62 #include <linux/types.h> << 63 #include <linux/param.h> << 64 << 65 unsigned long random_get_entropy_fallback(void << 66 << 67 #include <asm/timex.h> << 68 << 69 #ifndef random_get_entropy << 70 /* 56 /* 71 * The random_get_entropy() function is used b !! 57 * The following defines establish the engineering parameters of the PLL 72 * in order to extract entropy via the relativ !! 58 * model. The HZ variable establishes the timer interrupt frequency, 100 Hz 73 * when an interrupt takes places versus a hig !! 59 * for the SunOS kernel, 256 Hz for the Ultrix kernel and 1024 Hz for the 74 * timing source or cycle counter. Since it w !! 60 * OSF/1 kernel. The SHIFT_HZ define expresses the same value as the 75 * single interrupt, it must have a very low c !! 61 * nearest power of two in order to avoid hardware multiply operations. 76 * << 77 * By default we use get_cycles() for this pur << 78 * architectures may override this in their as << 79 * If a given arch does not have get_cycles(), << 80 * using random_get_entropy_fallback(). << 81 */ 62 */ 82 #ifdef get_cycles !! 63 #if HZ >= 12 && HZ < 24 83 #define random_get_entropy() ((unsigned lon !! 64 # define SHIFT_HZ 4 >> 65 #elif HZ >= 24 && HZ < 48 >> 66 # define SHIFT_HZ 5 >> 67 #elif HZ >= 48 && HZ < 96 >> 68 # define SHIFT_HZ 6 >> 69 #elif HZ >= 96 && HZ < 192 >> 70 # define SHIFT_HZ 7 >> 71 #elif HZ >= 192 && HZ < 384 >> 72 # define SHIFT_HZ 8 >> 73 #elif HZ >= 384 && HZ < 768 >> 74 # define SHIFT_HZ 9 >> 75 #elif HZ >= 768 && HZ < 1536 >> 76 # define SHIFT_HZ 10 84 #else 77 #else 85 #define random_get_entropy() random_get_ent !! 78 # error You lose. 86 #endif << 87 #endif 79 #endif 88 80 89 /* 81 /* 90 * SHIFT_PLL is used as a dampening factor to !! 82 * SHIFT_KG and SHIFT_KF establish the damping of the PLL and are chosen 91 * adjust the frequency correction for a given !! 83 * for a slightly underdamped convergence characteristic. SHIFT_KH 92 * It also used in dampening the offset correc !! 84 * establishes the damping of the FLL and is chosen by wisdom and black 93 * much of the current value in time_offset we !! 85 * art. 94 * second. Changing this value changes the sti !! 86 * 95 * adjustment code. A lower value makes it mor !! 87 * MAXTC establishes the maximum time constant of the PLL. With the 96 * NTP convergence time. A higher value makes !! 88 * SHIFT_KG and SHIFT_KF values given and a time constant range from 97 * convergence time, but making the clock more !! 89 * zero to MAXTC, the PLL will converge in 15 minutes to 16 hours, 98 * !! 90 * respectively. 99 * In David Mills' nanokernel reference implem !! 91 */ 100 * However this seems to increase convergence !! 92 #define SHIFT_KG 6 /* phase factor (shift) */ 101 * !! 93 #define SHIFT_KF 16 /* PLL frequency factor (shift) */ 102 * https://lists.ntp.org/pipermail/hackers/200 !! 94 #define SHIFT_KH 2 /* FLL frequency factor (shift) */ 103 * !! 95 #define MAXTC 6 /* maximum time constant (shift) */ 104 * In the above mailing list discussion, it se << 105 * was appropriate for other Unix systems with << 106 * SHIFT_PLL should be decreased as HZ increas << 107 * clock steering implementation is HZ indepen << 108 * << 109 * Through experimentation, a SHIFT_PLL value << 110 * for fast convergence (very similar to the N << 111 * v2.6.19), with good clock stability. << 112 * << 113 * << 114 * SHIFT_FLL is used as a dampening factor to << 115 * adjust the frequency correction for a given << 116 * In David Mills' nanokernel reference implem << 117 * << 118 * MAXTC establishes the maximum time constant << 119 */ << 120 #define SHIFT_PLL 2 /* PLL frequen << 121 #define SHIFT_FLL 2 /* FLL frequen << 122 #define MAXTC 10 /* maximum tim << 123 96 124 /* 97 /* >> 98 * The SHIFT_SCALE define establishes the decimal point of the time_phase >> 99 * variable which serves as an extension to the low-order bits of the >> 100 * system clock variable. The SHIFT_UPDATE define establishes the decimal >> 101 * point of the time_offset variable which represents the current offset >> 102 * with respect to standard time. The FINEUSEC define represents 1 usec in >> 103 * scaled units. >> 104 * 125 * SHIFT_USEC defines the scaling (shift) of t 105 * SHIFT_USEC defines the scaling (shift) of the time_freq and 126 * time_tolerance variables, which represent t 106 * time_tolerance variables, which represent the current frequency 127 * offset and maximum frequency tolerance. 107 * offset and maximum frequency tolerance. >> 108 * >> 109 * FINEUSEC is 1 us in SHIFT_UPDATE units of the time_phase variable. 128 */ 110 */ >> 111 #define SHIFT_SCALE 22 /* phase scale (shift) */ >> 112 #define SHIFT_UPDATE (SHIFT_KG + MAXTC) /* time offset scale (shift) */ 129 #define SHIFT_USEC 16 /* frequency o 113 #define SHIFT_USEC 16 /* frequency offset scale (shift) */ 130 #define PPM_SCALE ((s64)NSEC_PER_USEC << (NTP_ !! 114 #define FINEUSEC (1L << SHIFT_SCALE) /* 1 us in phase units */ 131 #define PPM_SCALE_INV_SHIFT 19 !! 115 132 #define PPM_SCALE_INV ((1LL << (PPM_SCALE_INV_ !! 116 #define MAXPHASE 512000L /* max phase error (us) */ 133 PPM_SCALE + 1) !! 117 #define MAXFREQ (512L << SHIFT_USEC) /* max frequency error (ppm) */ 134 !! 118 #define MAXTIME (200L << PPS_AVG) /* max PPS error (jitter) (200 us) */ 135 #define MAXPHASE 500000000L /* max phase e !! 119 #define MINSEC 16L /* min interval between updates (s) */ 136 #define MAXFREQ 500000 /* max frequen !! 120 #define MAXSEC 1200L /* max interval between updates (s) */ 137 #define MAXFREQ_SCALED ((s64)MAXFREQ << NTP_SC !! 121 #define NTP_PHASE_LIMIT (MAXPHASE << 5) /* beyond max. dispersion */ 138 #define MINSEC 256 /* min interva << 139 #define MAXSEC 2048 /* max interva << 140 #define NTP_PHASE_LIMIT ((MAXPHASE / NSEC_PER_ << 141 122 142 /* 123 /* 143 * kernel variables !! 124 * The following defines are used only if a pulse-per-second (PPS) 144 * Note: maximum error = NTP sync distance = d !! 125 * signal is available and connected via a modem control lead, such as 145 * estimated error = NTP dispersion. !! 126 * produced by the optional ppsclock feature incorporated in the Sun >> 127 * asynch driver. They establish the design parameters of the frequency- >> 128 * lock loop used to discipline the CPU clock oscillator to the PPS >> 129 * signal. >> 130 * >> 131 * PPS_AVG is the averaging factor for the frequency loop, as well as >> 132 * the time and frequency dispersion. >> 133 * >> 134 * PPS_SHIFT and PPS_SHIFTMAX specify the minimum and maximum >> 135 * calibration intervals, respectively, in seconds as a power of two. >> 136 * >> 137 * PPS_VALID is the maximum interval before the PPS signal is considered >> 138 * invalid and protocol updates used directly instead. >> 139 * >> 140 * MAXGLITCH is the maximum interval before a time offset of more than >> 141 * MAXTIME is believed. >> 142 */ >> 143 #define PPS_AVG 2 /* pps averaging constant (shift) */ >> 144 #define PPS_SHIFT 2 /* min interval duration (s) (shift) */ >> 145 #define PPS_SHIFTMAX 8 /* max interval duration (s) (shift) */ >> 146 #define PPS_VALID 120 /* pps signal watchdog max (s) */ >> 147 #define MAXGLITCH 30 /* pps signal glitch max (s) */ >> 148 >> 149 /* >> 150 * Pick up the architecture specific timex specifications >> 151 */ >> 152 #include <asm/timex.h> >> 153 >> 154 /* LATCH is used in the interval timer and ftape setup. */ >> 155 #define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ) /* For divider */ >> 156 >> 157 /* >> 158 * syscall interface - used (mainly by NTP daemon) >> 159 * to discipline kernel clock oscillator 146 */ 160 */ 147 extern unsigned long tick_usec; /* USE !! 161 struct timex { 148 extern unsigned long tick_nsec; /* SHI !! 162 unsigned int modes; /* mode selector */ >> 163 long offset; /* time offset (usec) */ >> 164 long freq; /* frequency offset (scaled ppm) */ >> 165 long maxerror; /* maximum error (usec) */ >> 166 long esterror; /* estimated error (usec) */ >> 167 int status; /* clock command/status */ >> 168 long constant; /* pll time constant */ >> 169 long precision; /* clock precision (usec) (read only) */ >> 170 long tolerance; /* clock frequency tolerance (ppm) >> 171 * (read only) >> 172 */ >> 173 struct timeval time; /* (read only) */ >> 174 long tick; /* (modified) usecs between clock ticks */ >> 175 >> 176 long ppsfreq; /* pps frequency (scaled ppm) (ro) */ >> 177 long jitter; /* pps jitter (us) (ro) */ >> 178 int shift; /* interval duration (s) (shift) (ro) */ >> 179 long stabil; /* pps stability (scaled ppm) (ro) */ >> 180 long jitcnt; /* jitter limit exceeded (ro) */ >> 181 long calcnt; /* calibration intervals (ro) */ >> 182 long errcnt; /* calibration errors (ro) */ >> 183 long stbcnt; /* stability limit exceeded (ro) */ >> 184 >> 185 int :32; int :32; int :32; int :32; >> 186 int :32; int :32; int :32; int :32; >> 187 int :32; int :32; int :32; int :32; >> 188 }; 149 189 150 /* Required to safely shift negative values */ !! 190 /* 151 #define shift_right(x, s) ({ \ !! 191 * Mode codes (timex.mode) 152 __typeof__(x) __x = (x); \ !! 192 */ 153 __typeof__(s) __s = (s); \ !! 193 #define ADJ_OFFSET 0x0001 /* time offset */ 154 __x < 0 ? -(-__x >> __s) : __x >> __s; !! 194 #define ADJ_FREQUENCY 0x0002 /* frequency offset */ 155 }) !! 195 #define ADJ_MAXERROR 0x0004 /* maximum time error */ >> 196 #define ADJ_ESTERROR 0x0008 /* estimated time error */ >> 197 #define ADJ_STATUS 0x0010 /* clock status */ >> 198 #define ADJ_TIMECONST 0x0020 /* pll time constant */ >> 199 #define ADJ_TICK 0x4000 /* tick value */ >> 200 #define ADJ_OFFSET_SINGLESHOT 0x8001 /* old-fashioned adjtime */ >> 201 >> 202 /* xntp 3.4 compatibility names */ >> 203 #define MOD_OFFSET ADJ_OFFSET >> 204 #define MOD_FREQUENCY ADJ_FREQUENCY >> 205 #define MOD_MAXERROR ADJ_MAXERROR >> 206 #define MOD_ESTERROR ADJ_ESTERROR >> 207 #define MOD_STATUS ADJ_STATUS >> 208 #define MOD_TIMECONST ADJ_TIMECONST >> 209 #define MOD_CLKB ADJ_TICK >> 210 #define MOD_CLKA ADJ_OFFSET_SINGLESHOT /* 0x8000 in original */ >> 211 >> 212 >> 213 /* >> 214 * Status codes (timex.status) >> 215 */ >> 216 #define STA_PLL 0x0001 /* enable PLL updates (rw) */ >> 217 #define STA_PPSFREQ 0x0002 /* enable PPS freq discipline (rw) */ >> 218 #define STA_PPSTIME 0x0004 /* enable PPS time discipline (rw) */ >> 219 #define STA_FLL 0x0008 /* select frequency-lock mode (rw) */ >> 220 >> 221 #define STA_INS 0x0010 /* insert leap (rw) */ >> 222 #define STA_DEL 0x0020 /* delete leap (rw) */ >> 223 #define STA_UNSYNC 0x0040 /* clock unsynchronized (rw) */ >> 224 #define STA_FREQHOLD 0x0080 /* hold frequency (rw) */ >> 225 >> 226 #define STA_PPSSIGNAL 0x0100 /* PPS signal present (ro) */ >> 227 #define STA_PPSJITTER 0x0200 /* PPS signal jitter exceeded (ro) */ >> 228 #define STA_PPSWANDER 0x0400 /* PPS signal wander exceeded (ro) */ >> 229 #define STA_PPSERROR 0x0800 /* PPS signal calibration error (ro) */ 156 230 157 #define NTP_SCALE_SHIFT 32 !! 231 #define STA_CLOCKERR 0x1000 /* clock hardware fault (ro) */ 158 232 159 #define NTP_INTERVAL_FREQ (HZ) !! 233 #define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | \ 160 #define NTP_INTERVAL_LENGTH (NSEC_PER_SEC/NTP_ !! 234 STA_PPSERROR | STA_CLOCKERR) /* read-only bits */ 161 235 162 extern int do_adjtimex(struct __kernel_timex * !! 236 /* 163 extern int do_clock_adjtime(const clockid_t wh !! 237 * Clock states (time_state) >> 238 */ >> 239 #define TIME_OK 0 /* clock synchronized, no leap second */ >> 240 #define TIME_INS 1 /* insert leap second */ >> 241 #define TIME_DEL 2 /* delete leap second */ >> 242 #define TIME_OOP 3 /* leap second in progress */ >> 243 #define TIME_WAIT 4 /* leap second has occurred */ >> 244 #define TIME_ERROR 5 /* clock not synchronized */ >> 245 #define TIME_BAD TIME_ERROR /* bw compat */ 164 246 165 extern void hardpps(const struct timespec64 *, !! 247 #ifdef __KERNEL__ >> 248 /* >> 249 * kernel variables >> 250 * Note: maximum error = NTP synch distance = dispersion + delay / 2; >> 251 * estimated error = NTP dispersion. >> 252 */ >> 253 extern long tick; /* timer interrupt period */ >> 254 extern int tickadj; /* amount of adjustment per tick */ 166 255 167 int read_current_timer(unsigned long *timer_va !! 256 /* >> 257 * phase-lock loop variables >> 258 */ >> 259 extern int time_state; /* clock status */ >> 260 extern int time_status; /* clock synchronization status bits */ >> 261 extern long time_offset; /* time adjustment (us) */ >> 262 extern long time_constant; /* pll time constant */ >> 263 extern long time_tolerance; /* frequency tolerance (ppm) */ >> 264 extern long time_precision; /* clock precision (us) */ >> 265 extern long time_maxerror; /* maximum error */ >> 266 extern long time_esterror; /* estimated error */ >> 267 >> 268 extern long time_phase; /* phase offset (scaled us) */ >> 269 extern long time_freq; /* frequency offset (scaled ppm) */ >> 270 extern long time_adj; /* tick adjust (scaled 1 / HZ) */ >> 271 extern long time_reftime; /* time at last adjustment (s) */ >> 272 >> 273 extern long time_adjust; /* The amount of adjtime left */ >> 274 >> 275 /* interface variables pps->timer interrupt */ >> 276 extern long pps_offset; /* pps time offset (us) */ >> 277 extern long pps_jitter; /* time dispersion (jitter) (us) */ >> 278 extern long pps_freq; /* frequency offset (scaled ppm) */ >> 279 extern long pps_stabil; /* frequency dispersion (scaled ppm) */ >> 280 extern long pps_valid; /* pps signal watchdog counter */ >> 281 >> 282 /* interface variables pps->adjtimex */ >> 283 extern int pps_shift; /* interval duration (s) (shift) */ >> 284 extern long pps_jitcnt; /* jitter limit exceeded */ >> 285 extern long pps_calcnt; /* calibration intervals */ >> 286 extern long pps_errcnt; /* calibration errors */ >> 287 extern long pps_stbcnt; /* stability limit exceeded */ 168 288 169 /* The clock frequency of the i8253/i8254 PIT !! 289 #endif /* KERNEL */ 170 #define PIT_TICK_RATE 1193182ul << 171 290 172 #endif /* LINUX_TIMEX_H */ 291 #endif /* LINUX_TIMEX_H */ 173 292
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