com32/gpllib/vpd/vpd.c

   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
  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
  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             strncpy(vpd->bios_build_id, q + 0x0D, 9);
  85             strncpy(vpd->box_serial_number, q + 0x16, 7);
  86             strncpy(vpd->motherboard_serial_number, q + 0x1D, 11);
  87             strncpy(vpd->machine_type_model, q + 0x28, 7);
  88
  89             if (q[5] < 0x44)
  90                 return VPD_TABLE_PRESENT;
  91
  92             strncpy(vpd->bios_release_date, q + 0x30, 8);
  93             strncpy(vpd->default_flash_filename, q + 0x38, 12);
  94
  95             if (q[5] >= 0x46 && q[0x44] != 0x00) {
  96                 strncpy(vpd->bios_version, q + 0x44, 255);
  97             }
  98
  99             return VPD_TABLE_PRESENT;
 100         }
 101     }
 102     return -ENOVPDTABLE;
 103 }