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Linux/arch/x86/kernel/cpu/microcode/intel_lib.c

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

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