usr/src/uts/i86pc/os/cpupm/cpupm_amd.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 /*
  27  * AMD specific CPU power management support.
  28  */
  29
  30 #include <sys/x86_archext.h>
  31 #include <sys/cpu_acpi.h>
  32 #include <sys/pwrnow.h>
  33
  34 boolean_t
  35 cpupm_amd_init(cpu_t *cp)
  36 {
  37         cpupm_mach_state_t *mach_state =
  38             (cpupm_mach_state_t *)(cp->cpu_m.mcpu_pm_mach_state);
  39
  40         /* AMD? */
  41         if (x86_vendor != X86_VENDOR_AMD)
  42                 return (B_FALSE);
  43
  44         /*
  45          * If we support PowerNow! on this processor, then set the
  46          * correct cma_ops for the processor.
  47          */
  48         mach_state->ms_pstate.cma_ops = pwrnow_supported() ?
  49             &pwrnow_ops : NULL;
  50
  51         return (B_TRUE);
  52 }