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
43 int 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 */
51 int
52 cputime(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 */
68 void
69 startguprof(struct gmonparam *gp)
70 {
71
72 gp->profrate = tick_freq;
73 cputime_bias = 0;
74 cputime();
75 }
76
77 void
78 stopguprof(struct gmonparam *gp)
79 {
80
81 /* Nothing to do. */
82 }
83
84 #endif /* GUPROF */
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