1 | /* $NetBSD: acpi_pdc.c,v 1.2 2011/06/20 15:39:54 jruoho Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2010, 2011 Jukka Ruohonen <jruohonen@iki.fi> |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
14 | * notice, this list of conditions and the following disclaimer in the |
15 | * documentation and/or other materials provided with the distribution. |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
27 | * SUCH DAMAGE. |
28 | */ |
29 | #include <sys/cdefs.h> |
30 | __KERNEL_RCSID(0, "$NetBSD: acpi_pdc.c,v 1.2 2011/06/20 15:39:54 jruoho Exp $" ); |
31 | |
32 | #include <sys/param.h> |
33 | |
34 | #include <x86/cpu.h> |
35 | #include <x86/cputypes.h> |
36 | #include <x86/cpuvar.h> |
37 | |
38 | #include <dev/acpi/acpireg.h> |
39 | #include <dev/acpi/acpivar.h> |
40 | #include <dev/acpi/acpi_cpu.h> |
41 | |
42 | #include <machine/acpi_machdep.h> |
43 | |
44 | #define _COMPONENT ACPI_BUS_COMPONENT |
45 | ACPI_MODULE_NAME ("acpi_pdc" ) |
46 | |
47 | static uint32_t flags = 0; |
48 | |
49 | static ACPI_STATUS acpi_md_pdc_walk(ACPI_HANDLE, uint32_t,void *,void **); |
50 | static void acpi_md_pdc_set(ACPI_HANDLE, uint32_t); |
51 | |
52 | uint32_t |
53 | acpi_md_pdc(void) |
54 | { |
55 | struct cpu_info *ci = curcpu(); |
56 | uint32_t regs[4]; |
57 | |
58 | if (flags != 0) |
59 | return flags; |
60 | |
61 | if (cpu_vendor != CPUVENDOR_IDT && |
62 | cpu_vendor != CPUVENDOR_INTEL) |
63 | return 0; |
64 | |
65 | /* |
66 | * Basic SMP C-states (required for e.g. _CST). |
67 | */ |
68 | flags |= ACPICPU_PDC_C_C1PT | ACPICPU_PDC_C_C2C3; |
69 | |
70 | /* |
71 | * Claim to support dependency coordination. |
72 | */ |
73 | flags |= ACPICPU_PDC_P_SW | ACPICPU_PDC_C_SW | ACPICPU_PDC_T_SW; |
74 | |
75 | /* |
76 | * If MONITOR/MWAIT is available, announce |
77 | * support for native instructions in all C-states. |
78 | */ |
79 | if ((ci->ci_feat_val[1] & CPUID2_MONITOR) != 0) |
80 | flags |= ACPICPU_PDC_C_C1_FFH | ACPICPU_PDC_C_C2C3_FFH; |
81 | |
82 | /* |
83 | * Set native P- and T-states, if available. |
84 | */ |
85 | if ((ci->ci_feat_val[1] & CPUID2_EST) != 0) |
86 | flags |= ACPICPU_PDC_P_FFH; |
87 | |
88 | if ((ci->ci_feat_val[0] & CPUID_ACPI) != 0) |
89 | flags |= ACPICPU_PDC_T_FFH; |
90 | |
91 | /* |
92 | * Declare support for APERF and MPERF. |
93 | */ |
94 | if (cpuid_level >= 0x06) { |
95 | |
96 | x86_cpuid(0x00000006, regs); |
97 | |
98 | if ((regs[2] & CPUID_DSPM_HWF) != 0) |
99 | flags |= ACPICPU_PDC_P_HWF; |
100 | } |
101 | |
102 | /* |
103 | * As the _PDC must be evaluated before the internal namespace |
104 | * is built, we have no option but to walk with the interpreter. |
105 | */ |
106 | (void)AcpiWalkNamespace(ACPI_TYPE_ANY, ACPI_ROOT_OBJECT, |
107 | UINT32_MAX, acpi_md_pdc_walk, NULL, NULL, NULL); |
108 | |
109 | return flags; |
110 | } |
111 | |
112 | static ACPI_STATUS |
113 | acpi_md_pdc_walk(ACPI_HANDLE hdl, uint32_t level, void *aux, void **sta) |
114 | { |
115 | struct cpu_info *ci; |
116 | |
117 | ci = acpi_match_cpu_handle(hdl); |
118 | |
119 | if (ci != NULL) |
120 | acpi_md_pdc_set(hdl, flags); |
121 | |
122 | return AE_OK; |
123 | } |
124 | |
125 | static void |
126 | acpi_md_pdc_set(ACPI_HANDLE hdl, uint32_t val) |
127 | { |
128 | ACPI_OBJECT_LIST arg; |
129 | ACPI_OBJECT obj; |
130 | uint32_t cap[3]; |
131 | |
132 | arg.Count = 1; |
133 | arg.Pointer = &obj; |
134 | |
135 | cap[0] = ACPICPU_PDC_REVID; |
136 | cap[1] = 1; |
137 | cap[2] = val; |
138 | |
139 | obj.Type = ACPI_TYPE_BUFFER; |
140 | obj.Buffer.Length = sizeof(cap); |
141 | obj.Buffer.Pointer = (void *)cap; |
142 | |
143 | (void)AcpiEvaluateObject(hdl, "_PDC" , &arg, NULL); |
144 | } |
145 | |