Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 320 insertions, 0 deletions

diff --git a/include/linux/timex.h b/include/linux/timex.h
new file mode 100644
index 000000000000..74fdd07d3792
--- /dev/null
+++ b/include/linux/timex.h
@@ -0,0 +1,320 @@
+/*****************************************************************************
+ *                                                                           *
+ * Copyright (c) David L. Mills 1993                                         *
+ *                                                                           *
+ * Permission to use, copy, modify, and distribute this software and its     *
+ * documentation for any purpose and without fee is hereby granted, provided *
+ * that the above copyright notice appears in all copies and that both the   *
+ * copyright notice and this permission notice appear in supporting          *
+ * documentation, and that the name University of Delaware not be used in    *
+ * advertising or publicity pertaining to distribution of the software       *
+ * without specific, written prior permission.  The University of Delaware   *
+ * makes no representations about the suitability this software for any      *
+ * purpose.  It is provided "as is" without express or implied warranty.     *
+ *                                                                           *
+ *****************************************************************************/
+
+/*
+ * Modification history timex.h
+ *
+ * 29 Dec 97	Russell King
+ *	Moved CLOCK_TICK_RATE, CLOCK_TICK_FACTOR and FINETUNE to asm/timex.h
+ *	for ARM machines
+ *
+ *  9 Jan 97    Adrian Sun
+ *      Shifted LATCH define to allow access to alpha machines.
+ *
+ * 26 Sep 94	David L. Mills
+ *	Added defines for hybrid phase/frequency-lock loop.
+ *
+ * 19 Mar 94	David L. Mills
+ *	Moved defines from kernel routines to header file and added new
+ *	defines for PPS phase-lock loop.
+ *
+ * 20 Feb 94	David L. Mills
+ *	Revised status codes and structures for external clock and PPS
+ *	signal discipline.
+ *
+ * 28 Nov 93	David L. Mills
+ *	Adjusted parameters to improve stability and increase poll
+ *	interval.
+ *
+ * 17 Sep 93    David L. Mills
+ *      Created file $NTP/include/sys/timex.h
+ * 07 Oct 93    Torsten Duwe
+ *      Derived linux/timex.h
+ * 1995-08-13    Torsten Duwe
+ *      kernel PLL updated to 1994-12-13 specs (rfc-1589)
+ * 1997-08-30    Ulrich Windl
+ *      Added new constant NTP_PHASE_LIMIT
+ * 2004-08-12    Christoph Lameter
+ *      Reworked time interpolation logic
+ */
+#ifndef _LINUX_TIMEX_H
+#define _LINUX_TIMEX_H
+
+#include <linux/config.h>
+#include <linux/compiler.h>
+#include <linux/time.h>
+
+#include <asm/param.h>
+#include <asm/timex.h>
+
+/*
+ * SHIFT_KG and SHIFT_KF establish the damping of the PLL and are chosen
+ * for a slightly underdamped convergence characteristic. SHIFT_KH
+ * establishes the damping of the FLL and is chosen by wisdom and black
+ * art.
+ *
+ * MAXTC establishes the maximum time constant of the PLL. With the
+ * SHIFT_KG and SHIFT_KF values given and a time constant range from
+ * zero to MAXTC, the PLL will converge in 15 minutes to 16 hours,
+ * respectively.
+ */
+#define SHIFT_KG 6		/* phase factor (shift) */
+#define SHIFT_KF 16		/* PLL frequency factor (shift) */
+#define SHIFT_KH 2		/* FLL frequency factor (shift) */
+#define MAXTC 6			/* maximum time constant (shift) */
+
+/*
+ * The SHIFT_SCALE define establishes the decimal point of the time_phase
+ * variable which serves as an extension to the low-order bits of the
+ * system clock variable. The SHIFT_UPDATE define establishes the decimal
+ * point of the time_offset variable which represents the current offset
+ * with respect to standard time. The FINENSEC define represents 1 nsec in
+ * scaled units.
+ *
+ * SHIFT_USEC defines the scaling (shift) of the time_freq and
+ * time_tolerance variables, which represent the current frequency
+ * offset and maximum frequency tolerance.
+ *
+ * FINENSEC is 1 ns in SHIFT_UPDATE units of the time_phase variable.
+ */
+#define SHIFT_SCALE 22		/* phase scale (shift) */
+#define SHIFT_UPDATE (SHIFT_KG + MAXTC) /* time offset scale (shift) */
+#define SHIFT_USEC 16		/* frequency offset scale (shift) */
+#define FINENSEC (1L << (SHIFT_SCALE - 10)) /* ~1 ns in phase units */
+
+#define MAXPHASE 512000L        /* max phase error (us) */
+#define MAXFREQ (512L << SHIFT_USEC)  /* max frequency error (ppm) */
+#define MAXTIME (200L << PPS_AVG) /* max PPS error (jitter) (200 us) */
+#define MINSEC 16L              /* min interval between updates (s) */
+#define MAXSEC 1200L            /* max interval between updates (s) */
+#define	NTP_PHASE_LIMIT	(MAXPHASE << 5)	/* beyond max. dispersion */
+
+/*
+ * The following defines are used only if a pulse-per-second (PPS)
+ * signal is available and connected via a modem control lead, such as
+ * produced by the optional ppsclock feature incorporated in the Sun
+ * asynch driver. They establish the design parameters of the frequency-
+ * lock loop used to discipline the CPU clock oscillator to the PPS
+ * signal.
+ *
+ * PPS_AVG is the averaging factor for the frequency loop, as well as
+ * the time and frequency dispersion.
+ *
+ * PPS_SHIFT and PPS_SHIFTMAX specify the minimum and maximum
+ * calibration intervals, respectively, in seconds as a power of two.
+ *
+ * PPS_VALID is the maximum interval before the PPS signal is considered
+ * invalid and protocol updates used directly instead.
+ *
+ * MAXGLITCH is the maximum interval before a time offset of more than
+ * MAXTIME is believed.
+ */
+#define PPS_AVG 2		/* pps averaging constant (shift) */
+#define PPS_SHIFT 2		/* min interval duration (s) (shift) */
+#define PPS_SHIFTMAX 8		/* max interval duration (s) (shift) */
+#define PPS_VALID 120		/* pps signal watchdog max (s) */
+#define MAXGLITCH 30		/* pps signal glitch max (s) */
+
+/*
+ * syscall interface - used (mainly by NTP daemon)
+ * to discipline kernel clock oscillator
+ */
+struct timex {
+	unsigned int modes;	/* mode selector */
+	long offset;		/* time offset (usec) */
+	long freq;		/* frequency offset (scaled ppm) */
+	long maxerror;		/* maximum error (usec) */
+	long esterror;		/* estimated error (usec) */
+	int status;		/* clock command/status */
+	long constant;		/* pll time constant */
+	long precision;		/* clock precision (usec) (read only) */
+	long tolerance;		/* clock frequency tolerance (ppm)
+				 * (read only)
+				 */
+	struct timeval time;	/* (read only) */
+	long tick;		/* (modified) usecs between clock ticks */
+
+	long ppsfreq;           /* pps frequency (scaled ppm) (ro) */
+	long jitter;            /* pps jitter (us) (ro) */
+	int shift;              /* interval duration (s) (shift) (ro) */
+	long stabil;            /* pps stability (scaled ppm) (ro) */
+	long jitcnt;            /* jitter limit exceeded (ro) */
+	long calcnt;            /* calibration intervals (ro) */
+	long errcnt;            /* calibration errors (ro) */
+	long stbcnt;            /* stability limit exceeded (ro) */
+
+	int  :32; int  :32; int  :32; int  :32;
+	int  :32; int  :32; int  :32; int  :32;
+	int  :32; int  :32; int  :32; int  :32;
+};
+
+/*
+ * Mode codes (timex.mode)
+ */
+#define ADJ_OFFSET		0x0001	/* time offset */
+#define ADJ_FREQUENCY		0x0002	/* frequency offset */
+#define ADJ_MAXERROR		0x0004	/* maximum time error */
+#define ADJ_ESTERROR		0x0008	/* estimated time error */
+#define ADJ_STATUS		0x0010	/* clock status */
+#define ADJ_TIMECONST		0x0020	/* pll time constant */
+#define ADJ_TICK		0x4000	/* tick value */
+#define ADJ_OFFSET_SINGLESHOT	0x8001	/* old-fashioned adjtime */
+
+/* xntp 3.4 compatibility names */
+#define MOD_OFFSET	ADJ_OFFSET
+#define MOD_FREQUENCY	ADJ_FREQUENCY
+#define MOD_MAXERROR	ADJ_MAXERROR
+#define MOD_ESTERROR	ADJ_ESTERROR
+#define MOD_STATUS	ADJ_STATUS
+#define MOD_TIMECONST	ADJ_TIMECONST
+#define MOD_CLKB	ADJ_TICK
+#define MOD_CLKA	ADJ_OFFSET_SINGLESHOT /* 0x8000 in original */
+
+
+/*
+ * Status codes (timex.status)
+ */
+#define STA_PLL		0x0001	/* enable PLL updates (rw) */
+#define STA_PPSFREQ	0x0002	/* enable PPS freq discipline (rw) */
+#define STA_PPSTIME	0x0004	/* enable PPS time discipline (rw) */
+#define STA_FLL		0x0008	/* select frequency-lock mode (rw) */
+
+#define STA_INS		0x0010	/* insert leap (rw) */
+#define STA_DEL		0x0020	/* delete leap (rw) */
+#define STA_UNSYNC	0x0040	/* clock unsynchronized (rw) */
+#define STA_FREQHOLD	0x0080	/* hold frequency (rw) */
+
+#define STA_PPSSIGNAL	0x0100	/* PPS signal present (ro) */
+#define STA_PPSJITTER	0x0200	/* PPS signal jitter exceeded (ro) */
+#define STA_PPSWANDER	0x0400	/* PPS signal wander exceeded (ro) */
+#define STA_PPSERROR	0x0800	/* PPS signal calibration error (ro) */
+
+#define STA_CLOCKERR	0x1000	/* clock hardware fault (ro) */
+
+#define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | \
+    STA_PPSERROR | STA_CLOCKERR) /* read-only bits */
+
+/*
+ * Clock states (time_state)
+ */
+#define TIME_OK		0	/* clock synchronized, no leap second */
+#define TIME_INS	1	/* insert leap second */
+#define TIME_DEL	2	/* delete leap second */
+#define TIME_OOP	3	/* leap second in progress */
+#define TIME_WAIT	4	/* leap second has occurred */
+#define TIME_ERROR	5	/* clock not synchronized */
+#define TIME_BAD	TIME_ERROR /* bw compat */
+
+#ifdef __KERNEL__
+/*
+ * kernel variables
+ * Note: maximum error = NTP synch distance = dispersion + delay / 2;
+ * estimated error = NTP dispersion.
+ */
+extern unsigned long tick_usec;		/* USER_HZ period (usec) */
+extern unsigned long tick_nsec;		/* ACTHZ          period (nsec) */
+extern int tickadj;			/* amount of adjustment per tick */
+
+/*
+ * phase-lock loop variables
+ */
+extern int time_state;		/* clock status */
+extern int time_status;		/* clock synchronization status bits */
+extern long time_offset;	/* time adjustment (us) */
+extern long time_constant;	/* pll time constant */
+extern long time_tolerance;	/* frequency tolerance (ppm) */
+extern long time_precision;	/* clock precision (us) */
+extern long time_maxerror;	/* maximum error */
+extern long time_esterror;	/* estimated error */
+
+extern long time_freq;		/* frequency offset (scaled ppm) */
+extern long time_reftime;	/* time at last adjustment (s) */
+
+extern long time_adjust;	/* The amount of adjtime left */
+extern long time_next_adjust;	/* Value for time_adjust at next tick */
+
+/* interface variables pps->timer interrupt */
+extern long pps_offset;		/* pps time offset (us) */
+extern long pps_jitter;		/* time dispersion (jitter) (us) */
+extern long pps_freq;		/* frequency offset (scaled ppm) */
+extern long pps_stabil;		/* frequency dispersion (scaled ppm) */
+extern long pps_valid;		/* pps signal watchdog counter */
+
+/* interface variables pps->adjtimex */
+extern int pps_shift;		/* interval duration (s) (shift) */
+extern long pps_jitcnt;		/* jitter limit exceeded */
+extern long pps_calcnt;		/* calibration intervals */
+extern long pps_errcnt;		/* calibration errors */
+extern long pps_stbcnt;		/* stability limit exceeded */
+
+#ifdef CONFIG_TIME_INTERPOLATION
+
+#define TIME_SOURCE_CPU 0
+#define TIME_SOURCE_MMIO64 1
+#define TIME_SOURCE_MMIO32 2
+#define TIME_SOURCE_FUNCTION 3
+
+/* For proper operations time_interpolator clocks must run slightly slower
+ * than the standard clock since the interpolator may only correct by having
+ * time jump forward during a tick. A slower clock is usually a side effect
+ * of the integer divide of the nanoseconds in a second by the frequency.
+ * The accuracy of the division can be increased by specifying a shift.
+ * However, this may cause the clock not to be slow enough.
+ * The interpolator will self-tune the clock by slowing down if no
+ * resets occur or speeding up if the time jumps per analysis cycle
+ * become too high.
+ *
+ * Setting jitter compensates for a fluctuating timesource by comparing
+ * to the last value read from the timesource to insure that an earlier value
+ * is not returned by a later call. The price to pay
+ * for the compensation is that the timer routines are not as scalable anymore.
+ */
+
+struct time_interpolator {
+	u16 source;			/* time source flags */
+	u8 shift;			/* increases accuracy of multiply by shifting. */
+				/* Note that bits may be lost if shift is set too high */
+	u8 jitter;			/* if set compensate for fluctuations */
+	u32 nsec_per_cyc;		/* set by register_time_interpolator() */
+	void *addr;			/* address of counter or function */
+	u64 mask;			/* mask the valid bits of the counter */
+	unsigned long offset;		/* nsec offset at last update of interpolator */
+	u64 last_counter;		/* counter value in units of the counter at last update */
+	u64 last_cycle;			/* Last timer value if TIME_SOURCE_JITTER is set */
+	u64 frequency;			/* frequency in counts/second */
+	long drift;			/* drift in parts-per-million (or -1) */
+	unsigned long skips;		/* skips forward */
+	unsigned long ns_skipped;	/* nanoseconds skipped */
+	struct time_interpolator *next;
+};
+
+extern void register_time_interpolator(struct time_interpolator *);
+extern void unregister_time_interpolator(struct time_interpolator *);
+extern void time_interpolator_reset(void);
+extern unsigned long time_interpolator_get_offset(void);
+
+#else /* !CONFIG_TIME_INTERPOLATION */
+
+static inline void
+time_interpolator_reset(void)
+{
+}
+
+#endif /* !CONFIG_TIME_INTERPOLATION */
+
+#endif /* KERNEL */
+
+#endif /* LINUX_TIMEX_H */