blob: b9e3886d9e1618cc4b85345e81a8a2c23fb876ea [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07002#include <linux/string.h>
3#include <linux/init.h>
4#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/dmi.h>
Matt Domsch3ed3bce2006-03-26 01:37:03 -08006#include <linux/efi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/bootmem.h>
Andi Kleene9928672006-01-11 22:43:33 +01008#include <linux/slab.h>
Andi Kleenf2d3efe2006-03-25 16:30:22 +01009#include <asm/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
Linus Torvalds1da177e2005-04-16 15:20:36 -070011static char * __init dmi_string(struct dmi_header *dm, u8 s)
12{
Andrey Panin1249c512005-06-25 14:54:47 -070013 u8 *bp = ((u8 *) dm) + dm->length;
Andrey Paninc3c71202005-09-06 15:18:28 -070014 char *str = "";
Andrey Panin1249c512005-06-25 14:54:47 -070015
Andrey Paninc3c71202005-09-06 15:18:28 -070016 if (s) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 s--;
Andrey Paninc3c71202005-09-06 15:18:28 -070018 while (s > 0 && *bp) {
19 bp += strlen(bp) + 1;
20 s--;
21 }
22
23 if (*bp != 0) {
Andi Kleene9928672006-01-11 22:43:33 +010024 str = dmi_alloc(strlen(bp) + 1);
Andrey Paninc3c71202005-09-06 15:18:28 -070025 if (str != NULL)
26 strcpy(str, bp);
27 else
28 printk(KERN_ERR "dmi_string: out of memory.\n");
29 }
Bjorn Helgaas4f705ae2006-04-03 17:09:22 -070030 }
Andrey Paninc3c71202005-09-06 15:18:28 -070031
32 return str;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033}
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 */
Andrey Panin1249c512005-06-25 14:54:47 -070039static int __init dmi_table(u32 base, int len, int num,
40 void (*decode)(struct dmi_header *))
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
Andrey Panin1249c512005-06-25 14:54:47 -070042 u8 *buf, *data;
43 int i = 0;
Bjorn Helgaas4f705ae2006-04-03 17:09:22 -070044
Andi Kleene9928672006-01-11 22:43:33 +010045 buf = dmi_ioremap(base, len);
Andrey Panin1249c512005-06-25 14:54:47 -070046 if (buf == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 return -1;
48
49 data = buf;
50
51 /*
Bjorn Helgaas4f705ae2006-04-03 17:09:22 -070052 * 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 */
Andrey Panin1249c512005-06-25 14:54:47 -070055 while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
56 struct dmi_header *dm = (struct dmi_header *)data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 /*
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 */
Andrey Panin1249c512005-06-25 14:54:47 -070062 data += dm->length;
63 while ((data - buf < len - 1) && (data[0] || data[1]))
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 data++;
Andrey Panin1249c512005-06-25 14:54:47 -070065 if (data - buf < len - 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 decode(dm);
Andrey Panin1249c512005-06-25 14:54:47 -070067 data += 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 i++;
69 }
Andi Kleene9928672006-01-11 22:43:33 +010070 dmi_iounmap(buf, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 return 0;
72}
73
Andrey Panin1249c512005-06-25 14:54:47 -070074static int __init dmi_checksum(u8 *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
Andrey Panin1249c512005-06-25 14:54:47 -070076 u8 sum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 int a;
Bjorn Helgaas4f705ae2006-04-03 17:09:22 -070078
Andrey Panin1249c512005-06-25 14:54:47 -070079 for (a = 0; a < 15; a++)
80 sum += buf[a];
81
82 return sum == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085static char *dmi_ident[DMI_STRING_MAX];
Andrey Paninebad6a42005-09-06 15:18:29 -070086static LIST_HEAD(dmi_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88/*
89 * Save a DMI string
90 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070091static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
92{
Andrey Paninc3c71202005-09-06 15:18:28 -070093 char *p, *d = (char*) dm;
Andrey Panin1249c512005-06-25 14:54:47 -070094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 if (dmi_ident[slot])
96 return;
Andrey Panin1249c512005-06-25 14:54:47 -070097
Andrey Paninc3c71202005-09-06 15:18:28 -070098 p = dmi_string(dm, d[string]);
99 if (p == NULL)
100 return;
101
102 dmi_ident[slot] = p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103}
104
Andrey Paninebad6a42005-09-06 15:18:29 -0700105static void __init dmi_save_devices(struct dmi_header *dm)
106{
107 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
108 struct dmi_device *dev;
109
110 for (i = 0; i < count; i++) {
Andrey Paninbc834552006-03-25 03:06:31 -0800111 char *d = (char *)(dm + 1) + (i * 2);
Andrey Paninebad6a42005-09-06 15:18:29 -0700112
113 /* Skip disabled device */
114 if ((*d & 0x80) == 0)
115 continue;
116
Andi Kleene9928672006-01-11 22:43:33 +0100117 dev = dmi_alloc(sizeof(*dev));
Andrey Paninebad6a42005-09-06 15:18:29 -0700118 if (!dev) {
119 printk(KERN_ERR "dmi_save_devices: out of memory.\n");
120 break;
121 }
122
123 dev->type = *d++ & 0x7f;
124 dev->name = dmi_string(dm, *d);
125 dev->device_data = NULL;
126
127 list_add(&dev->list, &dmi_devices);
128 }
129}
130
131static void __init dmi_save_ipmi_device(struct dmi_header *dm)
132{
133 struct dmi_device *dev;
134 void * data;
135
Andi Kleene9928672006-01-11 22:43:33 +0100136 data = dmi_alloc(dm->length);
Andrey Paninebad6a42005-09-06 15:18:29 -0700137 if (data == NULL) {
138 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
139 return;
140 }
141
142 memcpy(data, dm, dm->length);
143
Andi Kleene9928672006-01-11 22:43:33 +0100144 dev = dmi_alloc(sizeof(*dev));
Andrey Paninebad6a42005-09-06 15:18:29 -0700145 if (!dev) {
146 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
147 return;
148 }
149
150 dev->type = DMI_DEV_TYPE_IPMI;
151 dev->name = "IPMI controller";
152 dev->device_data = data;
153
154 list_add(&dev->list, &dmi_devices);
155}
156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 * Process a DMI table entry. Right now all we care about are the BIOS
159 * and machine entries. For 2.5 we should pull the smbus controller info
160 * out of here.
161 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162static void __init dmi_decode(struct dmi_header *dm)
163{
Andrey Panin1249c512005-06-25 14:54:47 -0700164 switch(dm->type) {
Andrey Paninebad6a42005-09-06 15:18:29 -0700165 case 0: /* BIOS Information */
Andrey Panin1249c512005-06-25 14:54:47 -0700166 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
Andrey Panin1249c512005-06-25 14:54:47 -0700167 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
Andrey Panin1249c512005-06-25 14:54:47 -0700168 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
169 break;
Andrey Paninebad6a42005-09-06 15:18:29 -0700170 case 1: /* System Information */
Andrey Panin1249c512005-06-25 14:54:47 -0700171 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
Andrey Panin1249c512005-06-25 14:54:47 -0700172 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
Andrey Panin1249c512005-06-25 14:54:47 -0700173 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
Andrey Panin1249c512005-06-25 14:54:47 -0700174 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
175 break;
Andrey Paninebad6a42005-09-06 15:18:29 -0700176 case 2: /* Base Board Information */
Andrey Panin1249c512005-06-25 14:54:47 -0700177 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
Andrey Panin1249c512005-06-25 14:54:47 -0700178 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
Andrey Panin1249c512005-06-25 14:54:47 -0700179 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
180 break;
Andrey Paninebad6a42005-09-06 15:18:29 -0700181 case 10: /* Onboard Devices Information */
182 dmi_save_devices(dm);
183 break;
184 case 38: /* IPMI Device Information */
185 dmi_save_ipmi_device(dm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
187}
188
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800189static int __init dmi_present(char __iomem *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Andrey Panin61e032f2005-09-06 15:18:26 -0700191 u8 buf[15];
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800192 memcpy_fromio(buf, p, 15);
193 if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
194 u16 num = (buf[13] << 8) | buf[12];
195 u16 len = (buf[7] << 8) | buf[6];
196 u32 base = (buf[11] << 24) | (buf[10] << 16) |
197 (buf[9] << 8) | buf[8];
198
199 /*
200 * DMI version 0.0 means that the real version is taken from
201 * the SMBIOS version, which we don't know at this point.
202 */
203 if (buf[14] != 0)
204 printk(KERN_INFO "DMI %d.%d present.\n",
205 buf[14] >> 4, buf[14] & 0xF);
206 else
207 printk(KERN_INFO "DMI present.\n");
208 if (dmi_table(base,len, num, dmi_decode) == 0)
209 return 0;
210 }
211 return 1;
212}
213
214void __init dmi_scan_machine(void)
215{
Andrey Panin61e032f2005-09-06 15:18:26 -0700216 char __iomem *p, *q;
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800217 int rc;
Andrey Panin61e032f2005-09-06 15:18:26 -0700218
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800219 if (efi_enabled) {
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -0800220 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800221 goto out;
Andrey Panin61e032f2005-09-06 15:18:26 -0700222
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800223 /* This is called as a core_initcall() because it isn't
224 * needed during early boot. This also means we can
225 * iounmap the space when we're done with it.
226 */
Bjorn Helgaasb2c99e32006-03-26 01:37:08 -0800227 p = dmi_ioremap(efi.smbios, 32);
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800228 if (p == NULL)
229 goto out;
Andrey Panin61e032f2005-09-06 15:18:26 -0700230
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800231 rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
Tolentino, Matthew E23dd8422006-03-26 01:37:09 -0800232 dmi_iounmap(p, 32);
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800233 if (!rc)
234 return;
235 }
236 else {
237 /*
238 * no iounmap() for that ioremap(); it would be a no-op, but
239 * it's so early in setup that sucker gets confused into doing
240 * what it shouldn't if we actually call it.
241 */
242 p = dmi_ioremap(0xF0000, 0x10000);
243 if (p == NULL)
244 goto out;
Andrey Panin61e032f2005-09-06 15:18:26 -0700245
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800246 for (q = p; q < p + 0x10000; q += 16) {
247 rc = dmi_present(q);
248 if (!rc)
Andrey Panin61e032f2005-09-06 15:18:26 -0700249 return;
250 }
251 }
Matt Domsch3ed3bce2006-03-26 01:37:03 -0800252 out: printk(KERN_INFO "DMI not present or invalid.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255/**
256 * dmi_check_system - check system DMI data
257 * @list: array of dmi_system_id structures to match against
Randy Dunlapb0ef3712006-06-25 05:49:18 -0700258 * All non-null elements of the list must match
259 * their slot's (field index's) data (i.e., each
260 * list string must be a substring of the specified
261 * DMI slot's string data) to be considered a
262 * successful match.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 *
264 * Walk the blacklist table running matching functions until someone
265 * returns non zero or we hit the end. Callback function is called for
Randy Dunlapb0ef3712006-06-25 05:49:18 -0700266 * each successful match. Returns the number of matches.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 */
268int dmi_check_system(struct dmi_system_id *list)
269{
270 int i, count = 0;
271 struct dmi_system_id *d = list;
272
273 while (d->ident) {
274 for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
275 int s = d->matches[i].slot;
276 if (s == DMI_NONE)
277 continue;
278 if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
279 continue;
280 /* No match */
281 goto fail;
282 }
Robert Love640e8032005-09-06 15:18:30 -0700283 count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 if (d->callback && d->callback(d))
285 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286fail: d++;
287 }
288
289 return count;
290}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291EXPORT_SYMBOL(dmi_check_system);
292
293/**
294 * dmi_get_system_info - return DMI data value
Randy Dunlapb0ef3712006-06-25 05:49:18 -0700295 * @field: data index (see enum dmi_field)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 *
297 * Returns one DMI data value, can be used to perform
298 * complex DMI data checks.
299 */
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700300char *dmi_get_system_info(int field)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
302 return dmi_ident[field];
303}
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700304EXPORT_SYMBOL(dmi_get_system_info);
Andrey Paninebad6a42005-09-06 15:18:29 -0700305
306/**
307 * dmi_find_device - find onboard device by type/name
308 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
Randy Dunlapb0ef3712006-06-25 05:49:18 -0700309 * @name: device name string or %NULL to match all
Andrey Paninebad6a42005-09-06 15:18:29 -0700310 * @from: previous device found in search, or %NULL for new search.
311 *
312 * Iterates through the list of known onboard devices. If a device is
313 * found with a matching @vendor and @device, a pointer to its device
314 * structure is returned. Otherwise, %NULL is returned.
Randy Dunlapb0ef3712006-06-25 05:49:18 -0700315 * A new search is initiated by passing %NULL as the @from argument.
Andrey Paninebad6a42005-09-06 15:18:29 -0700316 * If @from is not %NULL, searches continue from next device.
317 */
318struct dmi_device * dmi_find_device(int type, const char *name,
319 struct dmi_device *from)
320{
321 struct list_head *d, *head = from ? &from->list : &dmi_devices;
322
323 for(d = head->next; d != &dmi_devices; d = d->next) {
324 struct dmi_device *dev = list_entry(d, struct dmi_device, list);
325
326 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
327 ((name == NULL) || (strcmp(dev->name, name) == 0)))
328 return dev;
329 }
330
331 return NULL;
332}
333EXPORT_SYMBOL(dmi_find_device);
Andi Kleenf083a322006-03-25 16:30:19 +0100334
335/**
336 * dmi_get_year - Return year of a DMI date
337 * @field: data index (like dmi_get_system_info)
338 *
339 * Returns -1 when the field doesn't exist. 0 when it is broken.
340 */
341int dmi_get_year(int field)
342{
343 int year;
344 char *s = dmi_get_system_info(field);
345
346 if (!s)
347 return -1;
348 if (*s == '\0')
349 return 0;
350 s = strrchr(s, '/');
351 if (!s)
352 return 0;
353
354 s += 1;
355 year = simple_strtoul(s, NULL, 0);
356 if (year && year < 100) { /* 2-digit year */
357 year += 1900;
358 if (year < 1996) /* no dates < spec 1.0 */
359 year += 100;
360 }
361
362 return year;
363}