1 #include <linux/types.h>
2 #include <linux/string.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
6 #include <linux/bootmem.h>
18 #define dmi_printk(x) printk x
23 static char * __init dmi_string(struct dmi_header *dm, u8 s)
25 u8 *bp = ((u8 *) dm) + dm->length;
30 while (s > 0 && *bp) {
38 * We have to be cautious here. We have seen BIOSes with DMI pointers
39 * pointing to completely the wrong place for example
41 static int __init dmi_table(u32 base, int len, int num,
42 void (*decode)(struct dmi_header *))
47 buf = bt_ioremap(base, len);
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)
57 while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
58 struct dmi_header *dm = (struct dmi_header *)data;
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
65 while ((data - buf < len - 1) && (data[0] || data[1]))
67 if (data - buf < len - 1)
76 static int __init dmi_checksum(u8 *buf)
81 for (a = 0; a < 15; a++)
87 static int __init dmi_iterate(void (*decode)(struct dmi_header *))
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.
97 p = ioremap(0xF0000, 0x10000);
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];
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.
114 printk(KERN_INFO "DMI %d.%d present.\n",
115 buf[14] >> 4, buf[14] & 0xF);
117 printk(KERN_INFO "DMI present.\n");
119 dmi_printk((KERN_INFO "%d structures occupying %d bytes.\n",
121 dmi_printk((KERN_INFO "DMI table at 0x%08X.\n", base));
123 if (dmi_table(base,len, num, decode) == 0)
130 static char *dmi_ident[DMI_STRING_MAX];
135 static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
138 char *p = dmi_string(dm, d[string]);
140 if (p == NULL || *p == 0)
145 dmi_ident[slot] = alloc_bootmem(strlen(p) + 1);
147 strcpy(dmi_ident[slot], p);
149 printk(KERN_ERR "dmi_save_ident: out of memory.\n");
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
157 static void __init dmi_decode(struct dmi_header *dm)
159 u8 *data __attribute__((__unused__)) = (u8 *)dm;
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);
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);
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);
191 void __init dmi_scan_machine(void)
193 if (dmi_iterate(dmi_decode))
194 printk(KERN_INFO "DMI not present.\n");
199 * dmi_check_system - check system DMI data
200 * @list: array of dmi_system_id structures to match against
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.
206 int dmi_check_system(struct dmi_system_id *list)
209 struct dmi_system_id *d = list;
212 for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
213 int s = d->matches[i].slot;
216 if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
221 if (d->callback && d->callback(d))
229 EXPORT_SYMBOL(dmi_check_system);
232 * dmi_get_system_info - return DMI data value
233 * @field: data index (see enum dmi_filed)
235 * Returns one DMI data value, can be used to perform
236 * complex DMI data checks.
238 char *dmi_get_system_info(int field)
240 return dmi_ident[field];
242 EXPORT_SYMBOL(dmi_get_system_info);