2 * Copyright (c) 2011 The DragonFly Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
14 * 3. Neither the name of The DragonFly Project nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific, prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/systm.h>
36 #include <sys/sysctl.h>
38 #include <machine/cpufunc.h>
39 #include <machine/cputypes.h>
40 #include <machine/md_var.h>
41 #include <machine/specialreg.h>
48 acpi_cpu_md_features(void)
50 uint32_t features = 0;
52 if (cpu_vendor_id == CPU_VENDOR_INTEL) {
53 if (cpu_feature2 & CPUID2_EST) {
54 features |= ACPI_PDC_PX_MSR |
55 ACPI_PDC_MP_PX_SWCOORD |
58 if ((cpu_feature2 & CPUID2_MON) &&
60 (CPUID_MWAIT_EXT | CPUID_MWAIT_INTBRK)) ==
61 (CPUID_MWAIT_EXT | CPUID_MWAIT_INTBRK)) {
62 features |= ACPI_PDC_MP_C1_NATIVE |
63 ACPI_PDC_MP_C2C3_NATIVE;