1 /*-
2 * Copyright (c) KATO Takenori, 1997, 1998.
3 *
4 * All rights reserved. Unpublished rights reserved under the copyright
5 * laws of Japan.
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 as
13 * the first lines of this file unmodified.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/8.0/sys/amd64/amd64/initcpu.c 198991 2009-11-06 17:09:04Z attilio $");
32
33 #include "opt_cpu.h"
34
35 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/systm.h>
38 #include <sys/sysctl.h>
39
40 #include <machine/cputypes.h>
41 #include <machine/md_var.h>
42 #include <machine/specialreg.h>
43
44 #include <vm/vm.h>
45 #include <vm/pmap.h>
46
47 static int hw_instruction_sse;
48 SYSCTL_INT(_hw, OID_AUTO, instruction_sse, CTLFLAG_RD,
49 &hw_instruction_sse, 0, "SIMD/MMX2 instructions available in CPU");
50
51 int cpu; /* Are we 386, 386sx, 486, etc? */
52 u_int cpu_feature; /* Feature flags */
53 u_int cpu_feature2; /* Feature flags */
54 u_int amd_feature; /* AMD feature flags */
55 u_int amd_feature2; /* AMD feature flags */
56 u_int amd_pminfo; /* AMD advanced power management info */
57 u_int via_feature_rng; /* VIA RNG features */
58 u_int via_feature_xcrypt; /* VIA ACE features */
59 u_int cpu_high; /* Highest arg to CPUID */
60 u_int cpu_exthigh; /* Highest arg to extended CPUID */
61 u_int cpu_id; /* Stepping ID */
62 u_int cpu_procinfo; /* HyperThreading Info / Brand Index / CLFUSH */
63 u_int cpu_procinfo2; /* Multicore info */
64 char cpu_vendor[20]; /* CPU Origin code */
65 u_int cpu_vendor_id; /* CPU vendor ID */
66 u_int cpu_fxsr; /* SSE enabled */
67 u_int cpu_mxcsr_mask; /* Valid bits in mxcsr */
68 u_int cpu_clflush_line_size = 32;
69
70 SYSCTL_UINT(_hw, OID_AUTO, via_feature_rng, CTLFLAG_RD,
71 &via_feature_rng, 0, "VIA C3/C7 RNG feature available in CPU");
72 SYSCTL_UINT(_hw, OID_AUTO, via_feature_xcrypt, CTLFLAG_RD,
73 &via_feature_xcrypt, 0, "VIA C3/C7 xcrypt feature available in CPU");
74
75 /*
76 * Initialize special VIA C3/C7 features
77 */
78 static void
79 init_via(void)
80 {
81 u_int regs[4], val;
82 u_int64_t msreg;
83
84 do_cpuid(0xc0000000, regs);
85 val = regs[0];
86 if (val >= 0xc0000001) {
87 do_cpuid(0xc0000001, regs);
88 val = regs[3];
89 } else
90 val = 0;
91
92 /* Enable RNG if present and disabled */
93 if (val & VIA_CPUID_HAS_RNG) {
94 if (!(val & VIA_CPUID_DO_RNG)) {
95 msreg = rdmsr(0x110B);
96 msreg |= 0x40;
97 wrmsr(0x110B, msreg);
98 }
99 via_feature_rng = VIA_HAS_RNG;
100 }
101 /* Enable AES engine if present and disabled */
102 if (val & VIA_CPUID_HAS_ACE) {
103 if (!(val & VIA_CPUID_DO_ACE)) {
104 msreg = rdmsr(0x1107);
105 msreg |= (0x01 << 28);
106 wrmsr(0x1107, msreg);
107 }
108 via_feature_xcrypt |= VIA_HAS_AES;
109 }
110 /* Enable ACE2 engine if present and disabled */
111 if (val & VIA_CPUID_HAS_ACE2) {
112 if (!(val & VIA_CPUID_DO_ACE2)) {
113 msreg = rdmsr(0x1107);
114 msreg |= (0x01 << 28);
115 wrmsr(0x1107, msreg);
116 }
117 via_feature_xcrypt |= VIA_HAS_AESCTR;
118 }
119 /* Enable SHA engine if present and disabled */
120 if (val & VIA_CPUID_HAS_PHE) {
121 if (!(val & VIA_CPUID_DO_PHE)) {
122 msreg = rdmsr(0x1107);
123 msreg |= (0x01 << 28/**/);
124 wrmsr(0x1107, msreg);
125 }
126 via_feature_xcrypt |= VIA_HAS_SHA;
127 }
128 /* Enable MM engine if present and disabled */
129 if (val & VIA_CPUID_HAS_PMM) {
130 if (!(val & VIA_CPUID_DO_PMM)) {
131 msreg = rdmsr(0x1107);
132 msreg |= (0x01 << 28/**/);
133 wrmsr(0x1107, msreg);
134 }
135 via_feature_xcrypt |= VIA_HAS_MM;
136 }
137 }
138
139 /*
140 * Initialize CPU control registers
141 */
142 void
143 initializecpu(void)
144 {
145 uint64_t msr;
146
147 if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) {
148 load_cr4(rcr4() | CR4_FXSR | CR4_XMM);
149 cpu_fxsr = hw_instruction_sse = 1;
150 }
151 if ((amd_feature & AMDID_NX) != 0) {
152 msr = rdmsr(MSR_EFER) | EFER_NXE;
153 wrmsr(MSR_EFER, msr);
154 pg_nx = PG_NX;
155 }
156 if (cpu_vendor_id == CPU_VENDOR_CENTAUR &&
157 CPUID_TO_FAMILY(cpu_id) == 0x6 &&
158 CPUID_TO_MODEL(cpu_id) >= 0xf)
159 init_via();
160
161 /*
162 * CPUID with %eax = 1, %ebx returns
163 * Bits 15-8: CLFLUSH line size
164 * (Value * 8 = cache line size in bytes)
165 */
166 if ((cpu_feature & CPUID_CLFSH) != 0)
167 cpu_clflush_line_size = ((cpu_procinfo >> 8) & 0xff) * 8;
168 /*
169 * XXXKIB: (temporary) hack to work around traps generated when
170 * CLFLUSHing APIC registers window.
171 */
172 if (cpu_vendor_id == CPU_VENDOR_INTEL && !(cpu_feature & CPUID_SS))
173 cpu_feature &= ~CPUID_CLFSH;
174 }
Cache object: bf44bd01132fb610f07b33ec7b7c8d1b
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