1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 2006 Erwan Velu - All Rights Reserved
4 *
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use,
9 * copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom
11 * the Software is furnished to do so, subject to the following
12 * conditions:
13 *
14 * The above copyright notice and this permission notice shall
15 * be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
25 *
26 * -----------------------------------------------------------------------
27 */
28
29 #include <stdio.h>
30 #include <string.h>
31 #include "vpd/vpd.h"
32
vpd_checksum(char * buf,int len)33 int vpd_checksum(char *buf, int len)
34 {
35 uint8_t sum = 0;
36 int a;
37
38 for (a = 0; a < len; a++)
39 sum += buf[a];
40 return (sum == 0);
41 }
42
vpd_decode(s_vpd * vpd)43 int vpd_decode(s_vpd * vpd)
44 {
45 uint8_t buf[16];
46 char *p, *q;
47
48 /* Cleaning structures */
49 memset(&vpd->base_address, 0, sizeof(vpd->base_address));
50 memset(&vpd->bios_build_id, 0, sizeof(vpd->bios_build_id));
51 memset(&vpd->box_serial_number, 0, sizeof(vpd->box_serial_number));
52 memset(&vpd->motherboard_serial_number, 0,
53 sizeof(vpd->motherboard_serial_number));
54 memset(&vpd->machine_type_model, 0, sizeof(vpd->machine_type_model));
55 memset(&vpd->bios_release_date, 0, sizeof(vpd->bios_release_date));
56 memset(&vpd->default_flash_filename, 0,
57 sizeof(vpd->default_flash_filename));
58 memset(&vpd->bios_version, 0, sizeof(vpd->bios_version));
59
60 /* Until we found elements in the vpdtable, we consider them as not filled */
61 vpd->filled = false;
62
63 p = (char *)0xF0000; /* The start address to look at the dmi table */
64 for (q = p; q < p + 0x10000; q += 4) {
65 memcpy(buf, q, 5);
66 if (memcmp(buf, "\252\125VPD", 5) == 0) {
67 snprintf(vpd->base_address, sizeof(vpd->base_address), "%p", q);
68 if (q[5] < 0x30)
69 return -ENOVPDTABLE;
70
71 vpd->filled = true;
72 /* XSeries have longer records, exact length seems to vary. */
73 if (!(q[5] >= 0x45 && vpd_checksum(q, q[5]))
74 /* Some Netvista seem to work with this. */
75 && !(vpd_checksum(q, 0x30))
76 /* The Thinkpad/Thinkcentre checksum does *not* include the first 13 bytes. */
77 && !(vpd_checksum(q + 0x0D, 0x30 - 0x0D))) {
78 /* A few systems have a bad checksum (xSeries 325, 330, 335
79 and 345 with early BIOS) but the record is otherwise
80 valid. */
81 printf("VPD: Bad checksum!\n");
82 }
83
84 strlcpy(vpd->bios_build_id, q + 0x0D, 9);
85 strlcpy(vpd->box_serial_number, q + 0x16, 7);
86 strlcpy(vpd->motherboard_serial_number, q + 0x1D, 11);
87 strlcpy(vpd->machine_type_model, q + 0x28, 7);
88
89 if (q[5] < 0x44)
90 return VPD_TABLE_PRESENT;
91
92 strlcpy(vpd->bios_release_date, q + 0x30, 8);
93 strlcpy(vpd->default_flash_filename, q + 0x38, 12);
94
95 if (q[5] >= 0x46 && q[0x44] != 0x00) {
96 strlcpy(vpd->bios_version, q + 0x44, 255);
97 }
98
99 return VPD_TABLE_PRESENT;
100 }
101 }
102 return -ENOVPDTABLE;
103 }
104