FreeBSD/Linux Kernel Cross Reference
sys/sys/cctr.h
1 /* $NetBSD: cctr.h,v 1.3 2008/04/28 20:24:10 martin Exp $ */
2
3 /*-
4 * Copyright (c) 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #ifndef _SYS_CCTR_H_
30 #define _SYS_CCTR_H_
31
32 #include <sys/timetc.h>
33
34 /*
35 * Variables used by cycle counter in kern_cctr.c.
36 */
37 struct cctr_state {
38 volatile u_int cc_gen; /* generation number for this data set */
39 volatile int64_t cc_val; /* reference CC value at calibration time */
40 volatile int64_t cc_cc; /* local CC value at calibration time */
41 volatile int64_t cc_delta; /* reference CC difference for
42 last calibration period */
43 volatile int64_t cc_denom; /* local CC difference for
44 last calibration period */
45 };
46
47 struct cpu_info;
48
49 void cc_calibrate_cpu(struct cpu_info *);
50 struct timecounter *cc_init(timecounter_get_t, uint64_t, const char *, int);
51 u_int cc_get_timecount(struct timecounter *);
52
53 #endif /* _SYS_CCTR_H_ */
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