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
40 static __inline int
cpu_hascounter(void)41 cpu_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
59 uint32_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
65 static __inline uint64_t
cpu_frequency(struct cpu_info * ci)66 cpu_frequency(struct cpu_info *ci)
67 {
68 return ci->ci_cctr_freq;
69 }
70
71 #endif /* _KERNEL */
72 #endif /* !_MIPS_CPU_COUNTER_H_ */
73