1 | /* $NetBSD: cpu_ucode_intel.c,v 1.11 2016/11/21 04:10:05 ozaki-r Exp $ */ |
2 | /* |
3 | * Copyright (c) 2012 The NetBSD Foundation, Inc. |
4 | * All rights reserved. |
5 | * |
6 | * This code is derived from software contributed to The NetBSD Foundation |
7 | * by Matthias Drochner. |
8 | * |
9 | * Redistribution and use in source and binary forms, with or without |
10 | * modification, are permitted provided that the following conditions |
11 | * are met: |
12 | * 1. Redistributions of source code must retain the above copyright |
13 | * notice, this list of conditions and the following disclaimer. |
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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
19 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
20 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
21 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
22 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
28 | * POSSIBILITY OF SUCH DAMAGE. |
29 | */ |
30 | |
31 | #include <sys/cdefs.h> |
32 | __KERNEL_RCSID(0, "$NetBSD: cpu_ucode_intel.c,v 1.11 2016/11/21 04:10:05 ozaki-r Exp $" ); |
33 | |
34 | #include "opt_xen.h" |
35 | #include "opt_cpu_ucode.h" |
36 | #include "opt_compat_netbsd.h" |
37 | |
38 | #include <sys/param.h> |
39 | #include <sys/conf.h> |
40 | #include <sys/cpuio.h> |
41 | #include <sys/cpu.h> |
42 | #include <sys/kmem.h> |
43 | |
44 | #include <machine/cpufunc.h> |
45 | #include <machine/specialreg.h> |
46 | #include <x86/cpu_ucode.h> |
47 | |
48 | static void |
49 | intel_getcurrentucode(uint32_t *ucodeversion, int *platformid) |
50 | { |
51 | unsigned int unneeded_ids[4]; |
52 | uint64_t msr; |
53 | |
54 | kpreempt_disable(); |
55 | |
56 | wrmsr(MSR_BIOS_SIGN, 0); |
57 | x86_cpuid(0, unneeded_ids); |
58 | msr = rdmsr(MSR_BIOS_SIGN); |
59 | *ucodeversion = msr >> 32; |
60 | |
61 | kpreempt_enable(); |
62 | |
63 | msr = rdmsr(MSR_IA32_PLATFORM_ID); |
64 | *platformid = ((int)(msr >> 50)) & 7; |
65 | } |
66 | |
67 | int |
68 | cpu_ucode_intel_get_version(struct cpu_ucode_version *ucode) |
69 | { |
70 | struct cpu_info *ci = curcpu(); |
71 | struct cpu_ucode_version_intel1 data; |
72 | |
73 | if (ucode->loader_version != CPU_UCODE_LOADER_INTEL1 || |
74 | CPUID_TO_FAMILY(ci->ci_signature) < 6) |
75 | return EOPNOTSUPP; |
76 | if (!ucode->data) |
77 | return 0; |
78 | |
79 | intel_getcurrentucode(&data.ucodeversion, &data.platformid); |
80 | |
81 | return copyout(&data, ucode->data, sizeof(data)); |
82 | } |
83 | |
84 | int |
85 | cpu_ucode_intel_firmware_open(firmware_handle_t *fwh, const char *fwname) |
86 | { |
87 | const char *fw_path = "cpu_x86_intel1" ; |
88 | uint32_t ucodeversion, cpu_signature; |
89 | int platformid; |
90 | char cpuspec[11]; |
91 | |
92 | if (fwname != NULL && fwname[0] != '\0') |
93 | return firmware_open(fw_path, fwname, fwh); |
94 | |
95 | cpu_signature = curcpu()->ci_signature; |
96 | if (CPUID_TO_FAMILY(cpu_signature) < 6) |
97 | return EOPNOTSUPP; |
98 | |
99 | intel_getcurrentucode(&ucodeversion, &platformid); |
100 | snprintf(cpuspec, sizeof(cpuspec), "%08x-%d" , cpu_signature, |
101 | platformid); |
102 | |
103 | return firmware_open(fw_path, cpuspec, fwh); |
104 | } |
105 | |
106 | #ifndef XEN |
107 | int |
108 | cpu_ucode_intel_apply(struct cpu_ucode_softc *sc, int cpuno) |
109 | { |
110 | uint32_t ucodetarget, oucodeversion, nucodeversion; |
111 | int platformid, cpuid; |
112 | struct intel1_ucode_header *uh; |
113 | void *uha; |
114 | size_t newbufsize = 0; |
115 | int rv = 0; |
116 | |
117 | if (sc->loader_version != CPU_UCODE_LOADER_INTEL1 |
118 | || cpuno != CPU_UCODE_CURRENT_CPU) |
119 | return EINVAL; |
120 | |
121 | uh = (struct intel1_ucode_header *)(sc->sc_blob); |
122 | if (uh->uh_header_ver != 1 || uh->uh_loader_rev != 1) |
123 | return EINVAL; |
124 | ucodetarget = uh->uh_rev; |
125 | |
126 | if ((uintptr_t)(sc->sc_blob) & 15) { |
127 | /* Make the buffer 16 byte aligned */ |
128 | newbufsize = sc->sc_blobsize + 15; |
129 | uha = kmem_alloc(newbufsize, KM_SLEEP); |
130 | if (uha == NULL) { |
131 | printf("%s: memory allocation failed\n" , __func__); |
132 | return EINVAL; |
133 | } |
134 | uh = (struct intel1_ucode_header *)roundup2((uintptr_t)uha, 16); |
135 | /* Copy to the new area */ |
136 | memcpy(uh, sc->sc_blob, sc->sc_blobsize); |
137 | } |
138 | |
139 | kpreempt_disable(); |
140 | |
141 | intel_getcurrentucode(&oucodeversion, &platformid); |
142 | if (oucodeversion >= ucodetarget) { |
143 | kpreempt_enable(); |
144 | rv = EEXIST; /* ??? */ |
145 | goto out; |
146 | } |
147 | wrmsr(MSR_BIOS_UPDT_TRIG, (uintptr_t)uh + 48); |
148 | intel_getcurrentucode(&nucodeversion, &platformid); |
149 | cpuid = curcpu()->ci_index; |
150 | |
151 | kpreempt_enable(); |
152 | |
153 | if (nucodeversion != ucodetarget) { |
154 | rv = EIO; |
155 | goto out; |
156 | } |
157 | |
158 | printf("cpu %d: ucode 0x%x->0x%x\n" , cpuid, |
159 | oucodeversion, nucodeversion); |
160 | out: |
161 | if (newbufsize != 0) |
162 | kmem_free(uha, newbufsize); |
163 | return rv; |
164 | } |
165 | #endif /* ! XEN */ |
166 | |