1 #include <linux/types.h>
2 #include <linux/string.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
7 #include <linux/bootmem.h>
8 #include <linux/slab.h>
11 static char * __init dmi_string(struct dmi_header *dm, u8 s)
13 u8 *bp = ((u8 *) dm) + dm->length;
18 while (s > 0 && *bp) {
24 str = dmi_alloc(strlen(bp) + 1);
28 printk(KERN_ERR "dmi_string: out of memory.\n");
36 * We have to be cautious here. We have seen BIOSes with DMI pointers
37 * pointing to completely the wrong place for example
39 static int __init dmi_table(u32 base, int len, int num,
40 void (*decode)(struct dmi_header *))
45 buf = dmi_ioremap(base, len);
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)
55 while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
56 struct dmi_header *dm = (struct dmi_header *)data;
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
63 while ((data - buf < len - 1) && (data[0] || data[1]))
65 if (data - buf < len - 1)
70 dmi_iounmap(buf, len);
74 static int __init dmi_checksum(u8 *buf)
79 for (a = 0; a < 15; a++)
85 static char *dmi_ident[DMI_STRING_MAX];
86 static LIST_HEAD(dmi_devices);
91 static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
93 char *p, *d = (char*) dm;
98 p = dmi_string(dm, d[string]);
105 static void __init dmi_save_devices(struct dmi_header *dm)
107 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
108 struct dmi_device *dev;
110 for (i = 0; i < count; i++) {
111 char *d = (char *)(dm + 1) + (i * 2);
113 /* Skip disabled device */
114 if ((*d & 0x80) == 0)
117 dev = dmi_alloc(sizeof(*dev));
119 printk(KERN_ERR "dmi_save_devices: out of memory.\n");
123 dev->type = *d++ & 0x7f;
124 dev->name = dmi_string(dm, *d);
125 dev->device_data = NULL;
127 list_add(&dev->list, &dmi_devices);
131 static void __init dmi_save_ipmi_device(struct dmi_header *dm)
133 struct dmi_device *dev;
136 data = dmi_alloc(dm->length);
138 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
142 memcpy(data, dm, dm->length);
144 dev = dmi_alloc(sizeof(*dev));
146 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
150 dev->type = DMI_DEV_TYPE_IPMI;
151 dev->name = "IPMI controller";
152 dev->device_data = data;
154 list_add(&dev->list, &dmi_devices);
158 * 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
162 static void __init dmi_decode(struct dmi_header *dm)
165 case 0: /* BIOS Information */
166 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
167 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
168 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
170 case 1: /* System Information */
171 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
172 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
173 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
174 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
176 case 2: /* Base Board Information */
177 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
178 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
179 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
181 case 10: /* Onboard Devices Information */
182 dmi_save_devices(dm);
184 case 38: /* IPMI Device Information */
185 dmi_save_ipmi_device(dm);
189 static int __init dmi_present(char __iomem *p)
192 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];
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.
204 printk(KERN_INFO "DMI %d.%d present.\n",
205 buf[14] >> 4, buf[14] & 0xF);
207 printk(KERN_INFO "DMI present.\n");
208 if (dmi_table(base,len, num, dmi_decode) == 0)
214 void __init dmi_scan_machine(void)
220 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
223 /* 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.
227 p = dmi_ioremap(efi.smbios, 32);
231 rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
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.
242 p = dmi_ioremap(0xF0000, 0x10000);
246 for (q = p; q < p + 0x10000; q += 16) {
252 out: printk(KERN_INFO "DMI not present or invalid.\n");
256 * dmi_check_system - check system DMI data
257 * @list: array of dmi_system_id structures to match against
259 * Walk the blacklist table running matching functions until someone
260 * returns non zero or we hit the end. Callback function is called for
261 * each successfull match. Returns the number of matches.
263 int dmi_check_system(struct dmi_system_id *list)
266 struct dmi_system_id *d = list;
269 for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
270 int s = d->matches[i].slot;
273 if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
279 if (d->callback && d->callback(d))
286 EXPORT_SYMBOL(dmi_check_system);
289 * dmi_get_system_info - return DMI data value
290 * @field: data index (see enum dmi_filed)
292 * Returns one DMI data value, can be used to perform
293 * complex DMI data checks.
295 char *dmi_get_system_info(int field)
297 return dmi_ident[field];
299 EXPORT_SYMBOL(dmi_get_system_info);
302 * dmi_find_device - find onboard device by type/name
303 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
304 * @desc: device name string or %NULL to match all
305 * @from: previous device found in search, or %NULL for new search.
307 * Iterates through the list of known onboard devices. If a device is
308 * found with a matching @vendor and @device, a pointer to its device
309 * structure is returned. Otherwise, %NULL is returned.
310 * A new search is initiated by passing %NULL to the @from argument.
311 * If @from is not %NULL, searches continue from next device.
313 struct dmi_device * dmi_find_device(int type, const char *name,
314 struct dmi_device *from)
316 struct list_head *d, *head = from ? &from->list : &dmi_devices;
318 for(d = head->next; d != &dmi_devices; d = d->next) {
319 struct dmi_device *dev = list_entry(d, struct dmi_device, list);
321 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
322 ((name == NULL) || (strcmp(dev->name, name) == 0)))
328 EXPORT_SYMBOL(dmi_find_device);
331 * dmi_get_year - Return year of a DMI date
332 * @field: data index (like dmi_get_system_info)
334 * Returns -1 when the field doesn't exist. 0 when it is broken.
336 int dmi_get_year(int field)
339 char *s = dmi_get_system_info(field);
350 year = simple_strtoul(s, NULL, 0);
351 if (year && year < 100) { /* 2-digit year */
353 if (year < 1996) /* no dates < spec 1.0 */