1/*-
2 * Copyright 2008-2009 Stacey Son <sson@FreeBSD.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * $FreeBSD$
26 */
27
28/*
29 * Backend for the lock tracing (lockstat) kernel support. This is required
30 * to allow a module to load even though DTrace kernel support may not be
31 * present.
32 *
33 */
34
35#include "opt_kdtrace.h"
36
37#ifdef KDTRACE_HOOKS
38
39#include <sys/time.h>
40#include <sys/types.h>
41#include <sys/lockstat.h>
42
43/*
44 * The following must match the type definition of dtrace_probe.  It is
45 * defined this way to avoid having to rely on CDDL code.
46 */
47uint32_t lockstat_probemap[LS_NPROBES];
48void (*lockstat_probe_func)(uint32_t, uintptr_t, uintptr_t,
49    uintptr_t, uintptr_t, uintptr_t);
50
51
52uint64_t
53lockstat_nsecs(void)
54{
55	struct bintime bt;
56	uint64_t ns;
57
58	binuptime(&bt);
59	ns = bt.sec * (uint64_t)1000000000;
60	ns += ((uint64_t)1000000000 * (uint32_t)(bt.frac >> 32)) >> 32;
61	return (ns);
62}
63
64#endif /* KDTRACE_HOOKS */
65