#include <linux/config.h>
#include <linux/compiler.h>
+#include <linux/time.h>
#include <asm/param.h>
-
-/*
- * The following defines establish the engineering parameters of the PLL
- * model. The HZ variable establishes the timer interrupt frequency, 100 Hz
- * for the SunOS kernel, 256 Hz for the Ultrix kernel and 1024 Hz for the
- * OSF/1 kernel. The SHIFT_HZ define expresses the same value as the
- * nearest power of two in order to avoid hardware multiply operations.
- */
-#if HZ >= 12 && HZ < 24
-# define SHIFT_HZ 4
-#elif HZ >= 24 && HZ < 48
-# define SHIFT_HZ 5
-#elif HZ >= 48 && HZ < 96
-# define SHIFT_HZ 6
-#elif HZ >= 96 && HZ < 192
-# define SHIFT_HZ 7
-#elif HZ >= 192 && HZ < 384
-# define SHIFT_HZ 8
-#elif HZ >= 384 && HZ < 768
-# define SHIFT_HZ 9
-#elif HZ >= 768 && HZ < 1536
-# define SHIFT_HZ 10
-#else
-# error You lose.
-#endif
+#include <asm/timex.h>
/*
* SHIFT_KG and SHIFT_KF establish the damping of the PLL and are chosen
#define PPS_VALID 120 /* pps signal watchdog max (s) */
#define MAXGLITCH 30 /* pps signal glitch max (s) */
-/*
- * Pick up the architecture specific timex specifications
- */
-#include <asm/timex.h>
-
-/* LATCH is used in the interval timer and ftape setup. */
-#define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ) /* For divider */
-
-/* Suppose we want to devide two numbers NOM and DEN: NOM/DEN, the we can
- * improve accuracy by shifting LSH bits, hence calculating:
- * (NOM << LSH) / DEN
- * This however means trouble for large NOM, because (NOM << LSH) may no
- * longer fit in 32 bits. The following way of calculating this gives us
- * some slack, under the following conditions:
- * - (NOM / DEN) fits in (32 - LSH) bits.
- * - (NOM % DEN) fits in (32 - LSH) bits.
- */
-#define SH_DIV(NOM,DEN,LSH) ( ((NOM / DEN) << LSH) \
- + (((NOM % DEN) << LSH) + DEN / 2) / DEN)
-
-/* HZ is the requested value. ACTHZ is actual HZ ("<< 8" is for accuracy) */
-#define ACTHZ (SH_DIV (CLOCK_TICK_RATE, LATCH, 8))
-
-/* TICK_NSEC is the time between ticks in nsec assuming real ACTHZ */
-#define TICK_NSEC (SH_DIV (1000000UL * 1000, ACTHZ, 8))
-
-/* TICK_USEC is the time between ticks in usec assuming fake USER_HZ */
-#define TICK_USEC ((1000000UL + USER_HZ/2) / USER_HZ)
-
-/* TICK_USEC_TO_NSEC is the time between ticks in nsec assuming real ACTHZ and */
-/* a value TUSEC for TICK_USEC (can be set bij adjtimex) */
-#define TICK_USEC_TO_NSEC(TUSEC) (SH_DIV (TUSEC * USER_HZ * 1000, ACTHZ, 8))
-
-
-#include <linux/time.h>
/*
* syscall interface - used (mainly by NTP daemon)
* to discipline kernel clock oscillator
extern long time_maxerror; /* maximum error */
extern long time_esterror; /* estimated error */
-extern long time_phase; /* phase offset (scaled us) */
extern long time_freq; /* frequency offset (scaled ppm) */
-extern long time_adj; /* tick adjust (scaled 1 / HZ) */
extern long time_reftime; /* time at last adjustment (s) */
extern long time_adjust; /* The amount of adjtime left */
extern long pps_errcnt; /* calibration errors */
extern long pps_stbcnt; /* stability limit exceeded */
+/**
+ * ntp_clear - Clears the NTP state variables
+ *
+ * Must be called while holding a write on the xtime_lock
+ */
+static inline void ntp_clear(void)
+{
+ time_adjust = 0; /* stop active adjtime() */
+ time_status |= STA_UNSYNC;
+ time_maxerror = NTP_PHASE_LIMIT;
+ time_esterror = NTP_PHASE_LIMIT;
+}
+
+/**
+ * ntp_synced - Returns 1 if the NTP status is not UNSYNC
+ *
+ */
+static inline int ntp_synced(void)
+{
+ return !(time_status & STA_UNSYNC);
+}
+
+/* Required to safely shift negative values */
+#define shift_right(x, s) ({ \
+ __typeof__(x) __x = (x); \
+ __typeof__(s) __s = (s); \
+ __x < 0 ? -(-__x >> __s) : __x >> __s; \
+})
+
+
#ifdef CONFIG_TIME_INTERPOLATION
#define TIME_SOURCE_CPU 0
#endif /* !CONFIG_TIME_INTERPOLATION */
+/* Returns how long ticks are at present, in ns / 2^(SHIFT_SCALE-10). */
+extern u64 current_tick_length(void);
+
#endif /* KERNEL */
#endif /* LINUX_TIMEX_H */
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