drivers/firmware/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/efi.h>
   7 #include <linux/bootmem.h>
   8 #include <linux/slab.h>
   9 #include <asm/dmi.h>
  10
  11 static char * __init dmi_string(struct dmi_header *dm, u8 s)
  12 {
  13         u8 *bp = ((u8 *) dm) + dm->length;
  14         char *str = "";
  15
  16         if (s) {
  17                 s--;
  18                 while (s > 0 && *bp) {
  19                         bp += strlen(bp) + 1;
  20                         s--;
  21                 }
  22
  23                 if (*bp != 0) {
  24                         str = dmi_alloc(strlen(bp) + 1);
  25                         if (str != NULL)
  26                                 strcpy(str, bp);
  27                         else
  28                                 printk(KERN_ERR "dmi_string: out of memory.\n");
  29                 }
  30         }
  31
  32         return str;
  33 }
  34
  35 /*
  36  *      We have to be cautious here. We have seen BIOSes with DMI pointers
  37  *      pointing to completely the wrong place for example
  38  */
  39 static int __init dmi_table(u32 base, int len, int num,
  40                             void (*decode)(struct dmi_header *))
  41 {
  42         u8 *buf, *data;
  43         int i = 0;
  44
  45         buf = dmi_ioremap(base, len);
  46         if (buf == NULL)
  47                 return -1;
  48
  49         data = buf;
  50
  51         /*
  52          *      Stop when we see all the items the table claimed to have
  53          *      OR we run off the end of the table (also happens)
  54          */
  55         while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
  56                 struct dmi_header *dm = (struct dmi_header *)data;
  57                 /*
  58                  *  We want to know the total length (formated area and strings)
  59                  *  before decoding to make sure we won't run off the table in
  60                  *  dmi_decode or dmi_string
  61                  */
  62                 data += dm->length;
  63                 while ((data - buf < len - 1) && (data[0] || data[1]))
  64                         data++;
  65                 if (data - buf < len - 1)
  66                         decode(dm);
  67                 data += 2;
  68                 i++;
  69         }
  70         dmi_iounmap(buf, len);
  71         return 0;
  72 }
  73
  74 static int __init dmi_checksum(u8 *buf)
  75 {
  76         u8 sum = 0;
  77         int a;
  78
  79         for (a = 0; a < 15; a++)
  80                 sum += buf[a];
  81
  82         return sum == 0;
  83 }
  84
  85 static char *dmi_ident[DMI_STRING_MAX];
  86 static LIST_HEAD(dmi_devices);
  87 int dmi_available;
  88
  89 /*
  90  *      Save a DMI string
  91  */
  92 static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
  93 {
  94         char *p, *d = (char*) dm;
  95
  96         if (dmi_ident[slot])
  97                 return;
  98
  99         p = dmi_string(dm, d[string]);
 100         if (p == NULL)
 101                 return;
 102
 103         dmi_ident[slot] = p;
 104 }
 105
 106 static void __init dmi_save_uuid(struct dmi_header *dm, int slot, int index)
 107 {
 108         u8 *d = (u8*) dm + index;
 109         char *s;
 110         int is_ff = 1, is_00 = 1, i;
 111
 112         if (dmi_ident[slot])
 113                 return;
 114
 115         for (i = 0; i < 16 && (is_ff || is_00); i++) {
 116                 if(d[i] != 0x00) is_ff = 0;
 117                 if(d[i] != 0xFF) is_00 = 0;
 118         }
 119
 120         if (is_ff || is_00)
 121                 return;
 122
 123         s = dmi_alloc(16*2+4+1);
 124         if (!s)
 125                 return;
 126
 127         sprintf(s,
 128                 "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
 129                 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
 130                 d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
 131
 132         dmi_ident[slot] = s;
 133 }
 134
 135 static void __init dmi_save_type(struct dmi_header *dm, int slot, int index)
 136 {
 137         u8 *d = (u8*) dm + index;
 138         char *s;
 139
 140         if (dmi_ident[slot])
 141                 return;
 142
 143         s = dmi_alloc(4);
 144         if (!s)
 145                 return;
 146
 147         sprintf(s, "%u", *d & 0x7F);
 148         dmi_ident[slot] = s;
 149 }
 150
 151 static void __init dmi_save_devices(struct dmi_header *dm)
 152 {
 153         int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
 154         struct dmi_device *dev;
 155
 156         for (i = 0; i < count; i++) {
 157                 char *d = (char *)(dm + 1) + (i * 2);
 158
 159                 /* Skip disabled device */
 160                 if ((*d & 0x80) == 0)
 161                         continue;
 162
 163                 dev = dmi_alloc(sizeof(*dev));
 164                 if (!dev) {
 165                         printk(KERN_ERR "dmi_save_devices: out of memory.\n");
 166                         break;
 167                 }
 168
 169                 dev->type = *d++ & 0x7f;
 170                 dev->name = dmi_string(dm, *d);
 171                 dev->device_data = NULL;
 172                 list_add(&dev->list, &dmi_devices);
 173         }
 174 }
 175
 176 static void __init dmi_save_oem_strings_devices(struct dmi_header *dm)
 177 {
 178         int i, count = *(u8 *)(dm + 1);
 179         struct dmi_device *dev;
 180
 181         for (i = 1; i <= count; i++) {
 182                 dev = dmi_alloc(sizeof(*dev));
 183                 if (!dev) {
 184                         printk(KERN_ERR
 185                            "dmi_save_oem_strings_devices: out of memory.\n");
 186                         break;
 187                 }
 188
 189                 dev->type = DMI_DEV_TYPE_OEM_STRING;
 190                 dev->name = dmi_string(dm, i);
 191                 dev->device_data = NULL;
 192
 193                 list_add(&dev->list, &dmi_devices);
 194         }
 195 }
 196
 197 static void __init dmi_save_ipmi_device(struct dmi_header *dm)
 198 {
 199         struct dmi_device *dev;
 200         void * data;
 201
 202         data = dmi_alloc(dm->length);
 203         if (data == NULL) {
 204                 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
 205                 return;
 206         }
 207
 208         memcpy(data, dm, dm->length);
 209
 210         dev = dmi_alloc(sizeof(*dev));
 211         if (!dev) {
 212                 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
 213                 return;
 214         }
 215
 216         dev->type = DMI_DEV_TYPE_IPMI;
 217         dev->name = "IPMI controller";
 218         dev->device_data = data;
 219
 220         list_add(&dev->list, &dmi_devices);
 221 }
 222
 223 /*
 224  *      Process a DMI table entry. Right now all we care about are the BIOS
 225  *      and machine entries. For 2.5 we should pull the smbus controller info
 226  *      out of here.
 227  */
 228 static void __init dmi_decode(struct dmi_header *dm)
 229 {
 230         switch(dm->type) {
 231         case 0:         /* BIOS Information */
 232                 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
 233                 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
 234                 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
 235                 break;
 236         case 1:         /* System Information */
 237                 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
 238                 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
 239                 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
 240                 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
 241                 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
 242                 break;
 243         case 2:         /* Base Board Information */
 244                 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
 245                 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
 246                 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
 247                 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
 248                 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
 249                 break;
 250         case 3:         /* Chassis Information */
 251                 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
 252                 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
 253                 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
 254                 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
 255                 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
 256                 break;
 257         case 10:        /* Onboard Devices Information */
 258                 dmi_save_devices(dm);
 259                 break;
 260         case 11:        /* OEM Strings */
 261                 dmi_save_oem_strings_devices(dm);
 262                 break;
 263         case 38:        /* IPMI Device Information */
 264                 dmi_save_ipmi_device(dm);
 265         }
 266 }
 267
 268 static int __init dmi_present(char __iomem *p)
 269 {
 270         u8 buf[15];
 271         memcpy_fromio(buf, p, 15);
 272         if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
 273                 u16 num = (buf[13] << 8) | buf[12];
 274                 u16 len = (buf[7] << 8) | buf[6];
 275                 u32 base = (buf[11] << 24) | (buf[10] << 16) |
 276                         (buf[9] << 8) | buf[8];
 277
 278                 /*
 279                  * DMI version 0.0 means that the real version is taken from
 280                  * the SMBIOS version, which we don't know at this point.
 281                  */
 282                 if (buf[14] != 0)
 283                         printk(KERN_INFO "DMI %d.%d present.\n",
 284                                buf[14] >> 4, buf[14] & 0xF);
 285                 else
 286                         printk(KERN_INFO "DMI present.\n");
 287                 if (dmi_table(base,len, num, dmi_decode) == 0)
 288                         return 0;
 289         }
 290         return 1;
 291 }
 292
 293 void __init dmi_scan_machine(void)
 294 {
 295         char __iomem *p, *q;
 296         int rc;
 297
 298         if (efi_enabled) {
 299                 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
 300                         goto out;
 301
 302                 /* This is called as a core_initcall() because it isn't
 303                  * needed during early boot.  This also means we can
 304                  * iounmap the space when we're done with it.
 305                  */
 306                 p = dmi_ioremap(efi.smbios, 32);
 307                 if (p == NULL)
 308                         goto out;
 309
 310                 rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
 311                 dmi_iounmap(p, 32);
 312                 if (!rc) {
 313                         dmi_available = 1;
 314                         return;
 315                 }
 316         }
 317         else {
 318                 /*
 319                  * no iounmap() for that ioremap(); it would be a no-op, but
 320                  * it's so early in setup that sucker gets confused into doing
 321                  * what it shouldn't if we actually call it.
 322                  */
 323                 p = dmi_ioremap(0xF0000, 0x10000);
 324                 if (p == NULL)
 325                         goto out;
 326
 327                 for (q = p; q < p + 0x10000; q += 16) {
 328                         rc = dmi_present(q);
 329                         if (!rc) {
 330                                 dmi_available = 1;
 331                                 return;
 332                         }
 333                 }
 334         }
 335  out:   printk(KERN_INFO "DMI not present or invalid.\n");
 336 }
 337
 338 /**
 339  *      dmi_check_system - check system DMI data
 340  *      @list: array of dmi_system_id structures to match against
 341  *              All non-null elements of the list must match
 342  *              their slot's (field index's) data (i.e., each
 343  *              list string must be a substring of the specified
 344  *              DMI slot's string data) to be considered a
 345  *              successful match.
 346  *
 347  *      Walk the blacklist table running matching functions until someone
 348  *      returns non zero or we hit the end. Callback function is called for
 349  *      each successful match. Returns the number of matches.
 350  */
 351 int dmi_check_system(struct dmi_system_id *list)
 352 {
 353         int i, count = 0;
 354         struct dmi_system_id *d = list;
 355
 356         while (d->ident) {
 357                 for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
 358                         int s = d->matches[i].slot;
 359                         if (s == DMI_NONE)
 360                                 continue;
 361                         if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
 362                                 continue;
 363                         /* No match */
 364                         goto fail;
 365                 }
 366                 count++;
 367                 if (d->callback && d->callback(d))
 368                         break;
 369 fail:           d++;
 370         }
 371
 372         return count;
 373 }
 374 EXPORT_SYMBOL(dmi_check_system);
 375
 376 /**
 377  *      dmi_get_system_info - return DMI data value
 378  *      @field: data index (see enum dmi_field)
 379  *
 380  *      Returns one DMI data value, can be used to perform
 381  *      complex DMI data checks.
 382  */
 383 char *dmi_get_system_info(int field)
 384 {
 385         return dmi_ident[field];
 386 }
 387 EXPORT_SYMBOL(dmi_get_system_info);
 388
 389
 390 /**
 391  *      dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
 392  *      @str:   Case sensitive Name
 393  */
 394 int dmi_name_in_vendors(char *str)
 395 {
 396         static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR,
 397                                 DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR,
 398                                 DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE };
 399         int i;
 400         for (i = 0; fields[i] != DMI_NONE; i++) {
 401                 int f = fields[i];
 402                 if (dmi_ident[f] && strstr(dmi_ident[f], str))
 403                         return 1;
 404         }
 405         return 0;
 406 }
 407 EXPORT_SYMBOL(dmi_name_in_vendors);
 408
 409 /**
 410  *      dmi_find_device - find onboard device by type/name
 411  *      @type: device type or %DMI_DEV_TYPE_ANY to match all device types
 412  *      @name: device name string or %NULL to match all
 413  *      @from: previous device found in search, or %NULL for new search.
 414  *
 415  *      Iterates through the list of known onboard devices. If a device is
 416  *      found with a matching @vendor and @device, a pointer to its device
 417  *      structure is returned.  Otherwise, %NULL is returned.
 418  *      A new search is initiated by passing %NULL as the @from argument.
 419  *      If @from is not %NULL, searches continue from next device.
 420  */
 421 struct dmi_device * dmi_find_device(int type, const char *name,
 422                                     struct dmi_device *from)
 423 {
 424         struct list_head *d, *head = from ? &from->list : &dmi_devices;
 425
 426         for(d = head->next; d != &dmi_devices; d = d->next) {
 427                 struct dmi_device *dev = list_entry(d, struct dmi_device, list);
 428
 429                 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
 430                     ((name == NULL) || (strcmp(dev->name, name) == 0)))
 431                         return dev;
 432         }
 433
 434         return NULL;
 435 }
 436 EXPORT_SYMBOL(dmi_find_device);
 437
 438 /**
 439  *      dmi_get_year - Return year of a DMI date
 440  *      @field: data index (like dmi_get_system_info)
 441  *
 442  *      Returns -1 when the field doesn't exist. 0 when it is broken.
 443  */
 444 int dmi_get_year(int field)
 445 {
 446         int year;
 447         char *s = dmi_get_system_info(field);
 448
 449         if (!s)
 450                 return -1;
 451         if (*s == '\0')
 452                 return 0;
 453         s = strrchr(s, '/');
 454         if (!s)
 455                 return 0;
 456
 457         s += 1;
 458         year = simple_strtoul(s, NULL, 0);
 459         if (year && year < 100) {       /* 2-digit year */
 460                 year += 1900;
 461                 if (year < 1996)        /* no dates < spec 1.0 */
 462                         year += 100;
 463         }
 464
 465         return year;
 466 }
 467