kernel/os/cpupm.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <sys/sunddi.h>
  27 #include <sys/cpupm.h>
  28
  29 /*
  30  * Initialize the field that will be used for reporting
  31  * the supported_frequencies_Hz cpu_info kstat.
  32  */
  33 void
  34 cpupm_set_supp_freqs(cpu_t *cp, int *speeds, uint_t nspeeds)
  35 {
  36         char            *supp_freqs = NULL;
  37         char            *sfptr;
  38         uint64_t        *hzspeeds;
  39         int             i;
  40         int             j;
  41 #define UINT64_MAX_STRING (sizeof ("18446744073709551615"))
  42
  43         if (speeds == NULL) {
  44                 cpu_set_supp_freqs(cp, supp_freqs);
  45                 return;
  46         }
  47
  48         hzspeeds = kmem_zalloc(nspeeds * sizeof (uint64_t), KM_SLEEP);
  49         for (i = nspeeds - 1, j = 0; i >= 0; i--, j++) {
  50                 hzspeeds[i] = CPUPM_SPEED_HZ(cp->cpu_type_info.pi_clock,
  51                     speeds[j]);
  52         }
  53
  54         supp_freqs = kmem_zalloc((UINT64_MAX_STRING * nspeeds), KM_SLEEP);
  55         sfptr = supp_freqs;
  56         for (i = 0; i < nspeeds; i++) {
  57                 if (i == nspeeds - 1) {
  58                         (void) sprintf(sfptr, "%"PRIu64, hzspeeds[i]);
  59                 } else {
  60                         (void) sprintf(sfptr, "%"PRIu64":", hzspeeds[i]);
  61                         sfptr = supp_freqs + strlen(supp_freqs);
  62                 }
  63         }
  64         cpu_set_supp_freqs(cp, supp_freqs);
  65         kmem_free(supp_freqs, (UINT64_MAX_STRING * nspeeds));
  66         kmem_free(hzspeeds, nspeeds * sizeof (uint64_t));
  67 }