1/*	$NetBSD: cpu_counter.h,v 1.6 2020/07/26 08:08:41 simonb Exp $	*/
2
3/*
4 * Copyright (c) 2000 Soren S. Jorvang.  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
28#ifndef _MIPS_CPU_COUNTER_H_
29#define	_MIPS_CPU_COUNTER_H_
30
31/*
32 * Machine-specific support for CPU counter.
33 */
34
35#ifdef _KERNEL
36#if __mips < 3
37#include <mips/locore.h>
38#endif
39
40static __inline int
41cpu_hascounter(void)
42{
43	/*
44	 * MIPS III and MIPS IV CPU's have a cycle counter
45	 * running at half the internal pipeline rate.
46	 */
47#if __mips >= 3
48	return 1;
49#elif !defined(__mips_o32) || defined(MIPS3_PLUS)
50	return (MIPS_HAS_CLOCK);
51#else
52	return 0;
53#endif
54}
55
56#if __mips >= 3 || !defined(__mips_o32) || defined(MIPS3_PLUS)
57#define	cpu_counter()		cpu_counter32()
58
59uint32_t cpu_counter32(void);	/* weak alias of mips3_cp0_count_read */
60#else
61#define	cpu_counter()		(0)
62#define	cpu_counter32()		(0)
63#endif
64
65static __inline uint64_t
66cpu_frequency(struct cpu_info *ci)
67{
68	return ci->ci_cctr_freq;
69}
70
71#endif /* _KERNEL */
72#endif /* !_MIPS_CPU_COUNTER_H_ */
73