1/*	$NetBSD: db_cpu.c,v 1.6 2014/04/12 19:01:49 jakllsch Exp $	*/
2
3/*-
4 * Copyright (c) 2009 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
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#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: db_cpu.c,v 1.6 2014/04/12 19:01:49 jakllsch Exp $");
34
35#ifndef _KERNEL
36#include <stdbool.h>
37#endif
38
39#include <sys/param.h>
40#include <sys/cpu.h>
41#include <sys/proc.h>
42
43#include <ddb/ddb.h>
44
45static int		db_ncpu;
46static struct cpu_info	**db_cpu_infos;
47
48static void
49db_cpu_init(void)
50{
51	db_expr_t addr;
52
53	db_value_of_name("ncpu", &addr);
54	db_read_bytes((db_addr_t)addr, sizeof(db_ncpu), (char *)&db_ncpu);
55
56	db_value_of_name("cpu_infos", &addr);
57	db_read_bytes((db_addr_t)addr, sizeof(db_cpu_infos),
58	    (char *)&db_cpu_infos);
59}
60
61static struct cpu_info *
62db_cpu_by_index(u_int idx)
63{
64	struct cpu_info *ci;
65
66	db_read_bytes((db_addr_t)&db_cpu_infos[idx], sizeof(ci), (char *)&ci);
67	return ci;
68}
69
70struct cpu_info *
71db_cpu_first(void)
72{
73
74	db_cpu_init();
75	return db_cpu_by_index(0);
76}
77
78struct cpu_info *
79db_cpu_next(struct cpu_info *ci)
80{
81	u_int idx;
82
83	db_read_bytes((db_addr_t)&ci->ci_index, sizeof(idx), (char *)&idx);
84	if ((idx + 1) >= (u_int)db_ncpu)
85		return NULL;
86	return db_cpu_by_index(idx + 1);
87}
88