FreeBSD/Linux Kernel Cross Reference
sys/sys/cctr.h
1 /* $NetBSD: cctr.h,v 1.4 2020/10/10 03:05:04 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2004, 2020 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 int64_t cc_delta; /* delta from primary CPU CC */
39 u_int cc_cal_ticks; /* # ticks between calibrations */
40 u_int cc_ticks; /* # ticks since last calibration */
41 };
42
43 #ifdef _KERNEL
44 struct cpu_info;
45
46 struct timecounter *cc_init(timecounter_get_t, uint64_t, const char *, int);
47 void cc_init_secondary(struct cpu_info *);
48 u_int cc_get_timecount(struct timecounter *);
49 void cc_calibrate_cpu(struct cpu_info *);
50 void cc_primary_cc(void);
51
52 #define cc_hardclock(ci) \
53 do { \
54 if ((ci)->ci_cc.cc_cal_ticks && \
55 ++(ci)->ci_cc.cc_ticks == (ci)->ci_cc.cc_cal_ticks) { \
56 (ci)->ci_cc.cc_ticks = 0; \
57 cc_calibrate_cpu((ci)); \
58 } \
59 } while (/*CONSTCOND*/0)
60 #endif /* _KERNEL */
61
62 #endif /* _SYS_CCTR_H_ */
Cache object: e229303d5d56176fa1c90273c7146091
|