1/*-
2 * Copyright (c) 1996 Bruce D. Evans.
3 * Copyright (c) 2002 by Thomas Moestl <tmm@FreeBSD.org>.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *	from: src/sys/i386/isa/prof_machdep.c,v 1.16 2000/07/04 11:25:19
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#ifdef GUPROF
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/gmon.h>
38#include <sys/kernel.h>
39#include <sys/sysctl.h>
40
41#include <machine/profile.h>
42
43int	cputime_bias;
44
45/*
46 * Return the time elapsed since the last call.  The units are machine-
47 * dependent.
48 * XXX: this is not SMP-safe.  It should use per-CPU variables; %tick can be
49 * used though.
50 */
51int
52cputime(void)
53{
54	u_long count;
55	static u_long prev_count;
56	int delta;
57
58	count = rd(tick);
59	delta = (int)(count - prev_count);
60	prev_count = count;
61	return (delta);
62}
63
64/*
65 * The start and stop routines need not be here since we turn off profiling
66 * before calling them.  They are here for convenience.
67 */
68void
69startguprof(struct gmonparam *gp)
70{
71
72	gp->profrate = tick_freq;
73	cputime_bias = 0;
74	cputime();
75}
76
77void
78stopguprof(struct gmonparam *gp)
79{
80
81	/* Nothing to do. */
82}
83
84#endif /* GUPROF */
85