1/*	$NetBSD: cpu_counter.h,v 1.2 2012/08/29 18:45:40 matt Exp $	*/
2
3/*-
4 * Copyright (c) 2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _ARM_CPU_COUNTER_H_
33#define _ARM_CPU_COUNTER_H_
34
35/*
36 * ARM specific support for CPU counter (ARM11 and Cortex only).
37 * If __HAVE_CPU_COUNTER is defined for any other CPU_*, it will crash.
38 */
39
40#ifdef _KERNEL
41
42#include <sys/cpu.h>
43
44#if defined(CPU_CORTEX) || defined(CPU_ARM11)
45#define cpu_hascounter()	(curcpu()->ci_data.cpu_cc_freq != 0)
46#else
47#define cpu_hascounter()	false
48#endif
49
50#define cpu_counter()		cpu_counter32()
51
52#if defined(CPU_CORTEX) || defined(CPU_ARM11)
53static __inline uint32_t
54cpu_counter32(void)
55{
56#if defined(CPU_CORTEX) && defined(CPU_ARM11)
57	const bool cortex_p = CPU_ID_CORTEX_P(curcpu()->ci_arm_cpuid);
58#elif defined(CPU_CORTEX)
59	const bool cortex_p = true;
60#elif defined(CPU_ARM11)
61	const bool cortex_p = false;
62#endif
63
64	if (cortex_p)
65		return armreg_pmccntr_read();
66	else
67		return armreg_pmccntrv6_read();
68}
69#endif
70
71static __inline uint64_t
72cpu_frequency(struct cpu_info *ci)
73{
74	return ci->ci_data.cpu_cc_freq;
75}
76
77#endif /* _KERNEL */
78
79#endif /* _ARM_CPU_COUNTER_H_ */
80