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1 | /* | |
2 | * Intel CPU Microcode Update Driver for Linux | |
3 | * | |
4 | * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com> | |
5 | * H Peter Anvin" <hpa@zytor.com> | |
6 | * | |
7 | * This driver allows to upgrade microcode on Intel processors | |
8 | * belonging to IA-32 family - PentiumPro, Pentium II, | |
9 | * Pentium III, Xeon, Pentium 4, etc. | |
10 | * | |
11 | * Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture | |
12 | * Software Developer's Manual | |
13 | * Order Number 253668 or free download from: | |
14 | * | |
15 | * http://developer.intel.com/Assets/PDF/manual/253668.pdf | |
16 | * | |
17 | * For more information, go to http://www.urbanmyth.org/microcode | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or | |
20 | * modify it under the terms of the GNU General Public License | |
21 | * as published by the Free Software Foundation; either version | |
22 | * 2 of the License, or (at your option) any later version. | |
23 | * | |
24 | */ | |
25 | #include <linux/firmware.h> | |
26 | #include <linux/uaccess.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | ||
30 | #include <asm/microcode_intel.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/msr.h> | |
33 | ||
34 | static inline int | |
35 | update_match_cpu(unsigned int csig, unsigned int cpf, | |
36 | unsigned int sig, unsigned int pf) | |
37 | { | |
38 | return (!sigmatch(sig, csig, pf, cpf)) ? 0 : 1; | |
39 | } | |
40 | ||
41 | int | |
42 | update_match_revision(struct microcode_header_intel *mc_header, int rev) | |
43 | { | |
44 | return (mc_header->rev <= rev) ? 0 : 1; | |
45 | } | |
46 | ||
47 | int microcode_sanity_check(void *mc, int print_err) | |
48 | { | |
49 | unsigned long total_size, data_size, ext_table_size; | |
50 | struct microcode_header_intel *mc_header = mc; | |
51 | struct extended_sigtable *ext_header = NULL; | |
52 | int sum, orig_sum, ext_sigcount = 0, i; | |
53 | struct extended_signature *ext_sig; | |
54 | ||
55 | total_size = get_totalsize(mc_header); | |
56 | data_size = get_datasize(mc_header); | |
57 | ||
58 | if (data_size + MC_HEADER_SIZE > total_size) { | |
59 | if (print_err) | |
60 | pr_err("error! Bad data size in microcode data file\n"); | |
61 | return -EINVAL; | |
62 | } | |
63 | ||
64 | if (mc_header->ldrver != 1 || mc_header->hdrver != 1) { | |
65 | if (print_err) | |
66 | pr_err("error! Unknown microcode update format\n"); | |
67 | return -EINVAL; | |
68 | } | |
69 | ext_table_size = total_size - (MC_HEADER_SIZE + data_size); | |
70 | if (ext_table_size) { | |
71 | if ((ext_table_size < EXT_HEADER_SIZE) | |
72 | || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) { | |
73 | if (print_err) | |
74 | pr_err("error! Small exttable size in microcode data file\n"); | |
75 | return -EINVAL; | |
76 | } | |
77 | ext_header = mc + MC_HEADER_SIZE + data_size; | |
78 | if (ext_table_size != exttable_size(ext_header)) { | |
79 | if (print_err) | |
80 | pr_err("error! Bad exttable size in microcode data file\n"); | |
81 | return -EFAULT; | |
82 | } | |
83 | ext_sigcount = ext_header->count; | |
84 | } | |
85 | ||
86 | /* check extended table checksum */ | |
87 | if (ext_table_size) { | |
88 | int ext_table_sum = 0; | |
89 | int *ext_tablep = (int *)ext_header; | |
90 | ||
91 | i = ext_table_size / DWSIZE; | |
92 | while (i--) | |
93 | ext_table_sum += ext_tablep[i]; | |
94 | if (ext_table_sum) { | |
95 | if (print_err) | |
96 | pr_warn("aborting, bad extended signature table checksum\n"); | |
97 | return -EINVAL; | |
98 | } | |
99 | } | |
100 | ||
101 | /* calculate the checksum */ | |
102 | orig_sum = 0; | |
103 | i = (MC_HEADER_SIZE + data_size) / DWSIZE; | |
104 | while (i--) | |
105 | orig_sum += ((int *)mc)[i]; | |
106 | if (orig_sum) { | |
107 | if (print_err) | |
108 | pr_err("aborting, bad checksum\n"); | |
109 | return -EINVAL; | |
110 | } | |
111 | if (!ext_table_size) | |
112 | return 0; | |
113 | /* check extended signature checksum */ | |
114 | for (i = 0; i < ext_sigcount; i++) { | |
115 | ext_sig = (void *)ext_header + EXT_HEADER_SIZE + | |
116 | EXT_SIGNATURE_SIZE * i; | |
117 | sum = orig_sum | |
118 | - (mc_header->sig + mc_header->pf + mc_header->cksum) | |
119 | + (ext_sig->sig + ext_sig->pf + ext_sig->cksum); | |
120 | if (sum) { | |
121 | if (print_err) | |
122 | pr_err("aborting, bad checksum\n"); | |
123 | return -EINVAL; | |
124 | } | |
125 | } | |
126 | return 0; | |
127 | } | |
128 | EXPORT_SYMBOL_GPL(microcode_sanity_check); | |
129 | ||
130 | /* | |
131 | * return 0 - no update found | |
132 | * return 1 - found update | |
133 | */ | |
134 | int get_matching_sig(unsigned int csig, int cpf, void *mc, int rev) | |
135 | { | |
136 | struct microcode_header_intel *mc_header = mc; | |
137 | struct extended_sigtable *ext_header; | |
138 | unsigned long total_size = get_totalsize(mc_header); | |
139 | int ext_sigcount, i; | |
140 | struct extended_signature *ext_sig; | |
141 | ||
142 | if (update_match_cpu(csig, cpf, mc_header->sig, mc_header->pf)) | |
143 | return 1; | |
144 | ||
145 | /* Look for ext. headers: */ | |
146 | if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE) | |
147 | return 0; | |
148 | ||
149 | ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE; | |
150 | ext_sigcount = ext_header->count; | |
151 | ext_sig = (void *)ext_header + EXT_HEADER_SIZE; | |
152 | ||
153 | for (i = 0; i < ext_sigcount; i++) { | |
154 | if (update_match_cpu(csig, cpf, ext_sig->sig, ext_sig->pf)) | |
155 | return 1; | |
156 | ext_sig++; | |
157 | } | |
158 | return 0; | |
159 | } | |
160 | ||
161 | /* | |
162 | * return 0 - no update found | |
163 | * return 1 - found update | |
164 | */ | |
165 | int get_matching_microcode(unsigned int csig, int cpf, void *mc, int rev) | |
166 | { | |
167 | struct microcode_header_intel *mc_header = mc; | |
168 | ||
169 | if (!update_match_revision(mc_header, rev)) | |
170 | return 0; | |
171 | ||
172 | return get_matching_sig(csig, cpf, mc, rev); | |
173 | } | |
174 | EXPORT_SYMBOL_GPL(get_matching_microcode); |