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e666dfa2 FY |
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 | ||
6b2d469f BP |
34 | static inline bool cpu_signatures_match(unsigned int s1, unsigned int p1, |
35 | unsigned int s2, unsigned int p2) | |
e666dfa2 | 36 | { |
6b2d469f BP |
37 | if (s1 != s2) |
38 | return false; | |
39 | ||
40 | /* Processor flags are either both 0 ... */ | |
41 | if (!p1 && !p2) | |
42 | return true; | |
43 | ||
44 | /* ... or they intersect. */ | |
45 | return p1 & p2; | |
e666dfa2 FY |
46 | } |
47 | ||
e666dfa2 FY |
48 | int microcode_sanity_check(void *mc, int print_err) |
49 | { | |
50 | unsigned long total_size, data_size, ext_table_size; | |
51 | struct microcode_header_intel *mc_header = mc; | |
52 | struct extended_sigtable *ext_header = NULL; | |
53 | int sum, orig_sum, ext_sigcount = 0, i; | |
54 | struct extended_signature *ext_sig; | |
55 | ||
56 | total_size = get_totalsize(mc_header); | |
57 | data_size = get_datasize(mc_header); | |
58 | ||
59 | if (data_size + MC_HEADER_SIZE > total_size) { | |
60 | if (print_err) | |
61 | pr_err("error! Bad data size in microcode data file\n"); | |
62 | return -EINVAL; | |
63 | } | |
64 | ||
65 | if (mc_header->ldrver != 1 || mc_header->hdrver != 1) { | |
66 | if (print_err) | |
67 | pr_err("error! Unknown microcode update format\n"); | |
68 | return -EINVAL; | |
69 | } | |
70 | ext_table_size = total_size - (MC_HEADER_SIZE + data_size); | |
71 | if (ext_table_size) { | |
72 | if ((ext_table_size < EXT_HEADER_SIZE) | |
73 | || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) { | |
74 | if (print_err) | |
75 | pr_err("error! Small exttable size in microcode data file\n"); | |
76 | return -EINVAL; | |
77 | } | |
78 | ext_header = mc + MC_HEADER_SIZE + data_size; | |
79 | if (ext_table_size != exttable_size(ext_header)) { | |
80 | if (print_err) | |
81 | pr_err("error! Bad exttable size in microcode data file\n"); | |
82 | return -EFAULT; | |
83 | } | |
84 | ext_sigcount = ext_header->count; | |
85 | } | |
86 | ||
87 | /* check extended table checksum */ | |
88 | if (ext_table_size) { | |
89 | int ext_table_sum = 0; | |
90 | int *ext_tablep = (int *)ext_header; | |
91 | ||
92 | i = ext_table_size / DWSIZE; | |
93 | while (i--) | |
94 | ext_table_sum += ext_tablep[i]; | |
95 | if (ext_table_sum) { | |
96 | if (print_err) | |
97 | pr_warn("aborting, bad extended signature table checksum\n"); | |
98 | return -EINVAL; | |
99 | } | |
100 | } | |
101 | ||
102 | /* calculate the checksum */ | |
103 | orig_sum = 0; | |
104 | i = (MC_HEADER_SIZE + data_size) / DWSIZE; | |
105 | while (i--) | |
106 | orig_sum += ((int *)mc)[i]; | |
107 | if (orig_sum) { | |
108 | if (print_err) | |
109 | pr_err("aborting, bad checksum\n"); | |
110 | return -EINVAL; | |
111 | } | |
112 | if (!ext_table_size) | |
113 | return 0; | |
114 | /* check extended signature checksum */ | |
115 | for (i = 0; i < ext_sigcount; i++) { | |
116 | ext_sig = (void *)ext_header + EXT_HEADER_SIZE + | |
117 | EXT_SIGNATURE_SIZE * i; | |
118 | sum = orig_sum | |
119 | - (mc_header->sig + mc_header->pf + mc_header->cksum) | |
120 | + (ext_sig->sig + ext_sig->pf + ext_sig->cksum); | |
121 | if (sum) { | |
122 | if (print_err) | |
123 | pr_err("aborting, bad checksum\n"); | |
124 | return -EINVAL; | |
125 | } | |
126 | } | |
127 | return 0; | |
128 | } | |
129 | EXPORT_SYMBOL_GPL(microcode_sanity_check); | |
130 | ||
131 | /* | |
e3d8f674 | 132 | * Returns 1 if update has been found, 0 otherwise. |
e666dfa2 | 133 | */ |
e774eaa9 | 134 | int find_matching_signature(void *mc, unsigned int csig, int cpf) |
e666dfa2 | 135 | { |
9e5aed83 BP |
136 | struct microcode_header_intel *mc_hdr = mc; |
137 | struct extended_sigtable *ext_hdr; | |
e666dfa2 | 138 | struct extended_signature *ext_sig; |
9e5aed83 | 139 | int i; |
e666dfa2 | 140 | |
9e5aed83 | 141 | if (cpu_signatures_match(csig, cpf, mc_hdr->sig, mc_hdr->pf)) |
e666dfa2 FY |
142 | return 1; |
143 | ||
144 | /* Look for ext. headers: */ | |
9e5aed83 | 145 | if (get_totalsize(mc_hdr) <= get_datasize(mc_hdr) + MC_HEADER_SIZE) |
e666dfa2 FY |
146 | return 0; |
147 | ||
9e5aed83 BP |
148 | ext_hdr = mc + get_datasize(mc_hdr) + MC_HEADER_SIZE; |
149 | ext_sig = (void *)ext_hdr + EXT_HEADER_SIZE; | |
e666dfa2 | 150 | |
9e5aed83 | 151 | for (i = 0; i < ext_hdr->count; i++) { |
6b2d469f | 152 | if (cpu_signatures_match(csig, cpf, ext_sig->sig, ext_sig->pf)) |
e666dfa2 FY |
153 | return 1; |
154 | ext_sig++; | |
155 | } | |
156 | return 0; | |
157 | } | |
158 | ||
159 | /* | |
e3d8f674 | 160 | * Returns 1 if update has been found, 0 otherwise. |
e666dfa2 | 161 | */ |
8de3eafc | 162 | int has_newer_microcode(void *mc, unsigned int csig, int cpf, int new_rev) |
e666dfa2 | 163 | { |
e3d8f674 | 164 | struct microcode_header_intel *mc_hdr = mc; |
e666dfa2 | 165 | |
a1a32d29 | 166 | if (mc_hdr->rev <= new_rev) |
e666dfa2 FY |
167 | return 0; |
168 | ||
e774eaa9 | 169 | return find_matching_signature(mc, csig, cpf); |
e666dfa2 | 170 | } |
8de3eafc | 171 | EXPORT_SYMBOL_GPL(has_newer_microcode); |