xref: /illumos-gate/usr/src/uts/i86pc/os/cpupm/cpupm_amd.c (revision 9b0429a10eec9313ec782d8421272aff70adbfdc)
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
cpupm_amd_init(cpu_t * cp)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 or Hygon? */
41 	if (x86_vendor != X86_VENDOR_AMD &&
42 	    x86_vendor != X86_VENDOR_HYGON)
43 		return (B_FALSE);
44 
45 	/*
46 	 * If we support PowerNow! on this processor, then set the
47 	 * correct cma_ops for the processor.
48 	 */
49 	mach_state->ms_pstate.cma_ops = pwrnow_supported() ?
50 	    &pwrnow_ops : NULL;
51 
52 	return (B_TRUE);
53 }
54