1 /* $NetBSD: db_cpu.c,v 1.7 2014/04/12 19:25:48 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 1.7 2014/04/12 19:25:48 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
45 static int db_ncpu;
46 static struct cpu_info **db_cpu_infos;
47
48 static void
db_cpu_init(void)49 db_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
61 static struct cpu_info *
db_cpu_by_index(u_int idx)62 db_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
70 struct cpu_info *
db_cpu_first(void)71 db_cpu_first(void)
72 {
73
74 db_cpu_init();
75 return db_cpu_by_index(0);
76 }
77
78 struct cpu_info *
db_cpu_next(struct cpu_info * ci)79 db_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