104 lines
3.6 KiB
C
104 lines
3.6 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2006 Erwan Velu - All Rights Reserved
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* -----------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <string.h>
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#include "vpd/vpd.h"
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int vpd_checksum(char *buf, int len)
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{
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uint8_t sum = 0;
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int a;
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for (a = 0; a < len; a++)
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sum += buf[a];
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return (sum == 0);
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}
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int vpd_decode(s_vpd * vpd)
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{
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uint8_t buf[16];
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char *p, *q;
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/* Cleaning structures */
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memset(&vpd->base_address, 0, sizeof(vpd->base_address));
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memset(&vpd->bios_build_id, 0, sizeof(vpd->bios_build_id));
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memset(&vpd->box_serial_number, 0, sizeof(vpd->box_serial_number));
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memset(&vpd->motherboard_serial_number, 0,
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sizeof(vpd->motherboard_serial_number));
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memset(&vpd->machine_type_model, 0, sizeof(vpd->machine_type_model));
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memset(&vpd->bios_release_date, 0, sizeof(vpd->bios_release_date));
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memset(&vpd->default_flash_filename, 0,
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sizeof(vpd->default_flash_filename));
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memset(&vpd->bios_version, 0, sizeof(vpd->bios_version));
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/* Until we found elements in the vpdtable, we consider them as not filled */
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vpd->filled = false;
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p = (char *)0xF0000; /* The start address to look at the dmi table */
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for (q = p; q < p + 0x10000; q += 4) {
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memcpy(buf, q, 5);
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if (memcmp(buf, "\252\125VPD", 5) == 0) {
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snprintf(vpd->base_address, sizeof(vpd->base_address), "%p", q);
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if (q[5] < 0x30)
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return -ENOVPDTABLE;
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vpd->filled = true;
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/* XSeries have longer records, exact length seems to vary. */
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if (!(q[5] >= 0x45 && vpd_checksum(q, q[5]))
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/* Some Netvista seem to work with this. */
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&& !(vpd_checksum(q, 0x30))
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/* The Thinkpad/Thinkcentre checksum does *not* include the first 13 bytes. */
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&& !(vpd_checksum(q + 0x0D, 0x30 - 0x0D))) {
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/* A few systems have a bad checksum (xSeries 325, 330, 335
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and 345 with early BIOS) but the record is otherwise
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valid. */
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printf("VPD: Bad checksum!\n");
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}
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strlcpy(vpd->bios_build_id, q + 0x0D, 9);
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strlcpy(vpd->box_serial_number, q + 0x16, 7);
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strlcpy(vpd->motherboard_serial_number, q + 0x1D, 11);
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strlcpy(vpd->machine_type_model, q + 0x28, 7);
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if (q[5] < 0x44)
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return VPD_TABLE_PRESENT;
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strlcpy(vpd->bios_release_date, q + 0x30, 8);
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strlcpy(vpd->default_flash_filename, q + 0x38, 12);
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if (q[5] >= 0x46 && q[0x44] != 0x00) {
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strlcpy(vpd->bios_version, q + 0x44, 255);
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}
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return VPD_TABLE_PRESENT;
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}
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}
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return -ENOVPDTABLE;
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}
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