kernel/syscall/processor_info.c

   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 }