Include missing linux/slab.h inclusions
[linux-3.10.git] / arch / x86 / kernel / microcode_intel_lib.c
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);