1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*
* This file is part of the flashrom project.
*
* Copyright (C) 2002 Steven James <pyro@linuxlabs.com>
* Copyright (C) 2002 Linux Networx
* (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
* Copyright (C) 2006-2007 coresystems GmbH
* (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#include <errno.h>
#include <sys/mman.h>
#include "flash.h"
#include "coreboot_tables.h"
char *lb_part = NULL, *lb_vendor = NULL;
static unsigned long compute_checksum(void *addr, unsigned long length)
{
uint8_t *ptr;
volatile union {
uint8_t byte[2];
uint16_t word;
} value;
unsigned long sum;
unsigned long i;
/* In the most straight forward way possible,
* compute an ip style checksum.
*/
sum = 0;
ptr = addr;
for (i = 0; i < length; i++) {
unsigned long value;
value = ptr[i];
if (i & 1) {
value <<= 8;
}
/* Add the new value */
sum += value;
/* Wrap around the carry */
if (sum > 0xFFFF) {
sum = (sum + (sum >> 16)) & 0xFFFF;
}
}
value.byte[0] = sum & 0xff;
value.byte[1] = (sum >> 8) & 0xff;
return (~value.word) & 0xFFFF;
}
#define for_each_lbrec(head, rec) \
for(rec = (struct lb_record *)(((char *)head) + sizeof(*head)); \
(((char *)rec) < (((char *)head) + sizeof(*head) + head->table_bytes)) && \
(rec->size >= 1) && \
((((char *)rec) + rec->size) <= (((char *)head) + sizeof(*head) + head->table_bytes)); \
rec = (struct lb_record *)(((char *)rec) + rec->size))
static int count_lb_records(struct lb_header *head)
{
struct lb_record *rec;
int count;
count = 0;
for_each_lbrec(head, rec) {
count++;
}
return count;
}
static struct lb_header *find_lb_table(void *base, unsigned long start,
unsigned long end)
{
unsigned long addr;
/* For now be stupid.... */
for (addr = start; addr < end; addr += 16) {
struct lb_header *head =
(struct lb_header *)(((char *)base) + addr);
struct lb_record *recs =
(struct lb_record *)(((char *)base) + addr + sizeof(*head));
if (memcmp(head->signature, "LBIO", 4) != 0)
continue;
printf_debug("Found canidate at: %08lx-%08lx\n",
addr, addr + head->table_bytes);
if (head->header_bytes != sizeof(*head)) {
fprintf(stderr, "Header bytes of %d are incorrect.\n",
head->header_bytes);
continue;
}
if (count_lb_records(head) != head->table_entries) {
fprintf(stderr, "Bad record count: %d.\n",
head->table_entries);
continue;
}
if (compute_checksum((uint8_t *) head, sizeof(*head)) != 0) {
fprintf(stderr, "Bad header checksum.\n");
continue;
}
if (compute_checksum(recs, head->table_bytes)
!= head->table_checksum) {
fprintf(stderr, "Bad table checksum: %04x.\n",
head->table_checksum);
continue;
}
fprintf(stdout, "Found coreboot table at 0x%08lx.\n", addr);
return head;
};
return 0;
}
static void find_mainboard(struct lb_record *ptr, unsigned long addr)
{
struct lb_mainboard *rec;
int max_size;
char vendor[256], part[256];
rec = (struct lb_mainboard *)ptr;
max_size = rec->size - sizeof(*rec);
printf("Vendor ID: %.*s, part ID: %.*s\n",
max_size - rec->vendor_idx,
rec->strings + rec->vendor_idx,
max_size - rec->part_number_idx,
rec->strings + rec->part_number_idx);
snprintf(vendor, 255, "%.*s", max_size - rec->vendor_idx,
rec->strings + rec->vendor_idx);
snprintf(part, 255, "%.*s", max_size - rec->part_number_idx,
rec->strings + rec->part_number_idx);
if (lb_part) {
printf("Overwritten by command line, vendor ID: %s, part ID: %s.\n", lb_vendor, lb_part);
} else {
lb_part = strdup(part);
lb_vendor = strdup(vendor);
}
}
static struct lb_record *next_record(struct lb_record *rec)
{
return (struct lb_record *)(((char *)rec) + rec->size);
}
static void search_lb_records(struct lb_record *rec, struct lb_record *last,
unsigned long addr)
{
struct lb_record *next;
int count;
count = 0;
for (next = next_record(rec); (rec < last) && (next <= last);
rec = next, addr += rec->size) {
next = next_record(rec);
count++;
if (rec->tag == LB_TAG_MAINBOARD) {
find_mainboard(rec, addr);
break;
}
}
}
int coreboot_init(void)
{
uint8_t *low_1MB;
struct lb_header *lb_table;
struct lb_record *rec, *last;
low_1MB = mmap(0, 1024 * 1024, PROT_READ, MAP_SHARED, fd_mem,
0x00000000);
if (low_1MB == MAP_FAILED) {
perror("Can't mmap memory using " MEM_DEV);
exit(-2);
}
lb_table = 0;
if (!lb_table)
lb_table = find_lb_table(low_1MB, 0x00000, 0x1000);
if (!lb_table)
lb_table = find_lb_table(low_1MB, 0xf0000, 1024 * 1024);
if (lb_table) {
unsigned long addr;
addr = ((char *)lb_table) - ((char *)low_1MB);
printf_debug("Coreboot table found at %p.\n", lb_table);
rec = (struct lb_record *)(((char *)lb_table) + lb_table->header_bytes);
last = (struct lb_record *)(((char *)rec) + lb_table->table_bytes);
printf_debug("Coreboot header(%d) checksum: %04x table(%d) checksum: %04x entries: %d\n",
lb_table->header_bytes, lb_table->header_checksum,
lb_table->table_bytes, lb_table->table_checksum,
lb_table->table_entries);
search_lb_records(rec, last, addr + lb_table->header_bytes);
} else {
printf("No coreboot table found.\n");
return -1;
}
return 0;
}
|
