xref: /titanic_52/usr/src/uts/common/syscall/processor_info.c (revision fb3fb4f3d76d55b64440afd0af72775dfad3bd1d)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright (c) 1992, 1994, 1998 by Sun Microsystems, Inc.
24  * All rights reserved.
25  */
26 
27 #ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <sys/types.h>
30 #include <sys/param.h>
31 #include <sys/var.h>
32 #include <sys/thread.h>
33 #include <sys/cpuvar.h>
34 #include <sys/kstat.h>
35 #include <sys/uadmin.h>
36 #include <sys/systm.h>
37 #include <sys/errno.h>
38 #include <sys/cmn_err.h>
39 #include <sys/procset.h>
40 #include <sys/processor.h>
41 #include <sys/debug.h>
42 
43 /*
44  * processor_info(2) - return information on a processor.
45  */
46 int
47 processor_info(processorid_t cpun, processor_info_t *infop)
48 {
49 	cpu_t *cp;
50 	processor_info_t temp;
51 
52 	mutex_enter(&cpu_lock);
53 	if ((cp = cpu_get(cpun)) == NULL) {
54 		mutex_exit(&cpu_lock);
55 		return (set_errno(EINVAL));
56 	}
57 	bcopy(&cp->cpu_type_info, &temp, sizeof (temp));
58 	mutex_exit(&cpu_lock);
59 
60 	/*
61 	 * The spec indicates that the rest of the information is meaningless
62 	 * if the CPU is offline, but if presented by the machine-dependent
63 	 * layer, it is probably still accurate.  It seems OK to copy it all in
64 	 * either case.
65 	 */
66 	if (copyout((caddr_t)&temp, (caddr_t)infop,
67 	    sizeof (processor_info_t)))
68 		return (set_errno(EFAULT));
69 
70 	return (0);
71 }
72