1 /* $NetBSD: cpu_counter.h,v 1.7 2020/10/10 03:05:04 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2000 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
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 _ALPHA_CPU_COUNTER_H_
33 #define _ALPHA_CPU_COUNTER_H_
34
35 /*
36 * Machine-specific support for CPU counter.
37 */
38
39 #ifdef _KERNEL
40
41 #include <machine/cpu.h>
42 #include <machine/rpb.h>
43
44 #define cc_get_primary_cc() \
45 alpha_send_ipi(hwrpb->rpb_primary_cpu_id, ALPHA_IPI_PRIMARY_CC)
46
47 /* Process Cycle Counter is always available. */
48 #define cpu_hascounter() (1)
49 #define cpu_counter() cpu_counter32()
50
51 static __inline uint32_t
cpu_counter32(void)52 cpu_counter32(void)
53 {
54
55 /*
56 * Only the lower 32 bits of the PCC are an actual cycle
57 * counter. Thankfully, the rnd(4) code only wants a
58 * 32-bit value anyway.
59 */
60 return (alpha_rpcc() & 0xffffffffU);
61 }
62
63 static __inline uint64_t
cpu_frequency(struct cpu_info * ci)64 cpu_frequency(struct cpu_info *ci)
65 {
66
67 return (ci->ci_pcc_freq);
68 }
69
70 #endif /* _KERNEL */
71
72 #endif /* !_ALPHA_CPU_COUNTER_H_ */
73