From e2abcdca396661cbe0ae2ddb13d5c2b85682c13a Mon Sep 17 00:00:00 2001
From: Cem Keylan <cem@ckyln.com>
Date: Fri, 16 Oct 2020 17:41:25 +0300
Subject: initial commit

---
 sys/sys/timetc.h | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 sys/sys/timetc.h

(limited to 'sys/sys/timetc.h')

diff --git a/sys/sys/timetc.h b/sys/sys/timetc.h
new file mode 100644
index 0000000..ce81c34
--- /dev/null
+++ b/sys/sys/timetc.h
@@ -0,0 +1,107 @@
+/*	$OpenBSD: timetc.h,v 1.10 2019/10/26 21:16:38 cheloha Exp $ */
+
+/*
+ * Copyright (c) 2000 Poul-Henning Kamp <phk@FreeBSD.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * If we meet some day, and you think this stuff is worth it, you
+ * can buy me a beer in return. Poul-Henning Kamp
+ */
+
+#ifndef _SYS_TIMETC_H_
+#define	_SYS_TIMETC_H_
+
+#ifndef _KERNEL
+#error "no user-serviceable parts inside"
+#endif
+
+#include <sys/queue.h>
+
+/*-
+ * `struct timecounter' is the interface between the hardware which implements
+ * a timecounter and the MI code which uses this to keep track of time.
+ *
+ * A timecounter is a binary counter which has two properties:
+ *    * it runs at a fixed, known frequency.
+ *    * it has sufficient bits to not roll over in less than approximately
+ *      max(2 msec, 2/HZ seconds).  (The value 2 here is really 1 + delta,
+ *      for some indeterminate value of delta.)
+ */
+
+struct timecounter;
+typedef u_int timecounter_get_t(struct timecounter *);
+typedef void timecounter_pps_t(struct timecounter *);
+
+/*
+ * Locks used to protect struct members in this file:
+ *	I	immutable after initialization
+ *	t	tc_lock
+ *	w	windup_mtx
+ */
+
+struct timecounter {
+	timecounter_get_t	*tc_get_timecount;	/* [I] */
+		/*
+		 * This function reads the counter.  It is not required to
+		 * mask any unimplemented bits out, as long as they are
+		 * constant.
+		 */
+	timecounter_pps_t	*tc_poll_pps;		/* [I] */
+		/*
+		 * This function is optional.  It will be called whenever the
+		 * timecounter is rewound, and is intended to check for PPS
+		 * events.  Normal hardware does not need it but timecounters
+		 * which latch PPS in hardware (like sys/pci/xrpu.c) do.
+		 */
+	u_int 			tc_counter_mask;	/* [I] */
+		/* This mask should mask off any unimplemented bits. */
+	u_int64_t		tc_frequency;		/* [I] */
+		/* Frequency of the counter in Hz. */
+	char			*tc_name;		/* [I] */
+		/* Name of the timecounter. */
+	int			tc_quality;		/* [I] */
+		/*
+		 * Used to determine if this timecounter is better than
+		 * another timecounter higher means better.  Negative
+		 * means "only use at explicit request".
+		 */
+	void			*tc_priv;		/* [I] */
+		/* Pointer to the timecounter's private parts. */
+	SLIST_ENTRY(timecounter) tc_next;		/* [I] */
+		/* Pointer to the next timecounter. */
+	int64_t			tc_freq_adj;		/* [tw] */
+		/* Current frequency adjustment. */
+	u_int64_t		tc_precision;		/* [I] */
+		/* Precision of the counter.  Computed in tc_init(). */
+};
+
+struct rwlock;
+extern struct rwlock tc_lock;
+
+extern struct timecounter *timecounter;
+
+u_int64_t tc_getfrequency(void);
+u_int64_t tc_getprecision(void);
+void	tc_init(struct timecounter *tc);
+void	tc_setclock(const struct timespec *ts);
+void	tc_setrealtimeclock(const struct timespec *ts);
+void	tc_ticktock(void);
+void	inittimecounter(void);
+int	sysctl_tc(int *, u_int, void *, size_t *, void *, size_t);
+void	tc_adjfreq(int64_t *, int64_t *);
+void	tc_adjtime(int64_t *, int64_t *);
+
+#endif /* !_SYS_TIMETC_H_ */
-- 
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