arch/i386/kernel/dmi_scan.c

   1 #include <linux/types.h>
   2 #include <linux/string.h>
   3 #include <linux/init.h>
   4 #include <linux/module.h>
   5 #include <linux/dmi.h>
   6 #include <linux/bootmem.h>
   7
   8
   9 struct dmi_header {
  10         u8 type;
  11         u8 length;
  12         u16 handle;
  13 };
  14
  15 #undef DMI_DEBUG
  16
  17 #ifdef DMI_DEBUG
  18 #define dmi_printk(x) printk x
  19 #else
  20 #define dmi_printk(x)
  21 #endif
  22
  23 static char * __init dmi_string(struct dmi_header *dm, u8 s)
  24 {
  25         u8 *bp = ((u8 *) dm) + dm->length;
  26
  27         if (!s)
  28                 return "";
  29         s--;
  30         while (s > 0 && *bp) {
  31                 bp += strlen(bp) + 1;
  32                 s--;
  33         }
  34         return bp;
  35 }
  36
  37 /*
  38  *      We have to be cautious here. We have seen BIOSes with DMI pointers
  39  *      pointing to completely the wrong place for example
  40  */
  41 static int __init dmi_table(u32 base, int len, int num,
  42                             void (*decode)(struct dmi_header *))
  43 {
  44         u8 *buf, *data;
  45         int i = 0;
  46
  47         buf = bt_ioremap(base, len);
  48         if (buf == NULL)
  49                 return -1;
  50
  51         data = buf;
  52
  53         /*
  54          *      Stop when we see all the items the table claimed to have
  55          *      OR we run off the end of the table (also happens)
  56          */
  57         while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
  58                 struct dmi_header *dm = (struct dmi_header *)data;
  59                 /*
  60                  *  We want to know the total length (formated area and strings)
  61                  *  before decoding to make sure we won't run off the table in
  62                  *  dmi_decode or dmi_string
  63                  */
  64                 data += dm->length;
  65                 while ((data - buf < len - 1) && (data[0] || data[1]))
  66                         data++;
  67                 if (data - buf < len - 1)
  68                         decode(dm);
  69                 data += 2;
  70                 i++;
  71         }
  72         bt_iounmap(buf, len);
  73         return 0;
  74 }
  75
  76 static int __init dmi_checksum(u8 *buf)
  77 {
  78         u8 sum = 0;
  79         int a;
  80
  81         for (a = 0; a < 15; a++)
  82                 sum += buf[a];
  83
  84         return sum == 0;
  85 }
  86
  87 static int __init dmi_iterate(void (*decode)(struct dmi_header *))
  88 {
  89         u8 buf[15];
  90         char __iomem *p, *q;
  91
  92         /*
  93          * no iounmap() for that ioremap(); it would be a no-op, but it's
  94          * so early in setup that sucker gets confused into doing what
  95          * it shouldn't if we actually call it.
  96          */
  97         p = ioremap(0xF0000, 0x10000);
  98         if (p == NULL)
  99                 return -1;
 100
 101         for (q = p; q < p + 0x10000; q += 16) {
 102                 memcpy_fromio(buf, q, 15);
 103                 if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
 104                         u16 num = (buf[13] << 8) | buf[12];
 105                         u16 len = (buf[7] << 8) | buf[6];
 106                         u32 base = (buf[11] << 24) | (buf[10] << 16) |
 107                                    (buf[9] << 8) | buf[8];
 108
 109                         /*
 110                          * DMI version 0.0 means that the real version is taken from
 111                          * the SMBIOS version, which we don't know at this point.
 112                          */
 113                         if (buf[14] != 0)
 114                                 printk(KERN_INFO "DMI %d.%d present.\n",
 115                                         buf[14] >> 4, buf[14] & 0xF);
 116                         else
 117                                 printk(KERN_INFO "DMI present.\n");
 118
 119                         dmi_printk((KERN_INFO "%d structures occupying %d bytes.\n",
 120                                 num, len));
 121                         dmi_printk((KERN_INFO "DMI table at 0x%08X.\n", base));
 122
 123                         if (dmi_table(base,len, num, decode) == 0)
 124                                 return 0;
 125                 }
 126         }
 127         return -1;
 128 }
 129
 130 static char *dmi_ident[DMI_STRING_MAX];
 131
 132 /*
 133  *      Save a DMI string
 134  */
 135 static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
 136 {
 137         char *d = (char*)dm;
 138         char *p = dmi_string(dm, d[string]);
 139
 140         if (p == NULL || *p == 0)
 141                 return;
 142         if (dmi_ident[slot])
 143                 return;
 144
 145         dmi_ident[slot] = alloc_bootmem(strlen(p) + 1);
 146         if(dmi_ident[slot])
 147                 strcpy(dmi_ident[slot], p);
 148         else
 149                 printk(KERN_ERR "dmi_save_ident: out of memory.\n");
 150 }
 151
 152 /*
 153  *      Process a DMI table entry. Right now all we care about are the BIOS
 154  *      and machine entries. For 2.5 we should pull the smbus controller info
 155  *      out of here.
 156  */
 157 static void __init dmi_decode(struct dmi_header *dm)
 158 {
 159         u8 *data __attribute__((__unused__)) = (u8 *)dm;
 160
 161         switch(dm->type) {
 162         case  0:
 163                 dmi_printk(("BIOS Vendor: %s\n", dmi_string(dm, data[4])));
 164                 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
 165                 dmi_printk(("BIOS Version: %s\n", dmi_string(dm, data[5])));
 166                 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
 167                 dmi_printk(("BIOS Release: %s\n", dmi_string(dm, data[8])));
 168                 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
 169                 break;
 170         case 1:
 171                 dmi_printk(("System Vendor: %s\n", dmi_string(dm, data[4])));
 172                 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
 173                 dmi_printk(("Product Name: %s\n", dmi_string(dm, data[5])));
 174                 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
 175                 dmi_printk(("Version: %s\n", dmi_string(dm, data[6])));
 176                 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
 177                 dmi_printk(("Serial Number: %s\n", dmi_string(dm, data[7])));
 178                 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
 179                 break;
 180         case 2:
 181                 dmi_printk(("Board Vendor: %s\n", dmi_string(dm, data[4])));
 182                 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
 183                 dmi_printk(("Board Name: %s\n", dmi_string(dm, data[5])));
 184                 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
 185                 dmi_printk(("Board Version: %s\n", dmi_string(dm, data[6])));
 186                 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
 187                 break;
 188         }
 189 }
 190
 191 void __init dmi_scan_machine(void)
 192 {
 193         if (dmi_iterate(dmi_decode))
 194                 printk(KERN_INFO "DMI not present.\n");
 195 }
 196
 197
 198 /**
 199  *      dmi_check_system - check system DMI data
 200  *      @list: array of dmi_system_id structures to match against
 201  *
 202  *      Walk the blacklist table running matching functions until someone
 203  *      returns non zero or we hit the end. Callback function is called for
 204  *      each successfull match. Returns the number of matches.
 205  */
 206 int dmi_check_system(struct dmi_system_id *list)
 207 {
 208         int i, count = 0;
 209         struct dmi_system_id *d = list;
 210
 211         while (d->ident) {
 212                 for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
 213                         int s = d->matches[i].slot;
 214                         if (s == DMI_NONE)
 215                                 continue;
 216                         if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
 217                                 continue;
 218                         /* No match */
 219                         goto fail;
 220                 }
 221                 if (d->callback && d->callback(d))
 222                         break;
 223                 count++;
 224 fail:           d++;
 225         }
 226
 227         return count;
 228 }
 229 EXPORT_SYMBOL(dmi_check_system);
 230
 231 /**
 232  *      dmi_get_system_info - return DMI data value
 233  *      @field: data index (see enum dmi_filed)
 234  *
 235  *      Returns one DMI data value, can be used to perform
 236  *      complex DMI data checks.
 237  */
 238 char *dmi_get_system_info(int field)
 239 {
 240         return dmi_ident[field];
 241 }
 242 EXPORT_SYMBOL(dmi_get_system_info);