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
|
/*
* ifdfake - Create an Intel Firmware Descriptor with just a section layout
*
* Copyright (C) 2013 secunet Security Networks AG
*
* 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 <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#define FDBAR_OFFSET 0x10
#define FRBA_OFFSET 0x40
typedef struct {
uint32_t base, limit, size;
} region_t;
static void write_image(const region_t regions[], const char *const image)
{
FILE *const f = fopen(image, "w");
if (!f) {
perror("Could not open file");
exit(EXIT_FAILURE);
}
if (fseek(f, 0x1000 - 1, SEEK_SET)) {
perror("Failed to seek to end of descriptor");
exit(EXIT_FAILURE);
}
char zero = '\0';
if (fwrite(&zero, 1, 1, f) != 1) {
fprintf(stderr, "Failed to write at end of descriptor.\n");
exit(EXIT_FAILURE);
}
if (fseek(f, FDBAR_OFFSET, SEEK_SET)) {
perror("Failed to seek to fdbar");
exit(EXIT_FAILURE);
}
struct {
uint32_t flvalsig;
uint32_t flmap0;
} fdbar;
memset(&fdbar, 0x00, sizeof(fdbar));
fdbar.flvalsig = 0x0ff0a55a;
fdbar.flmap0 = (FRBA_OFFSET >> 4) << 16;
if (fwrite(&fdbar, sizeof(fdbar), 1, f) != 1) {
fprintf(stderr, "Failed to write fdbar.\n");
exit(EXIT_FAILURE);
}
int i;
uint32_t frba[5];
for (i = 0; i < 5; ++i) {
if (regions[i].size)
frba[i] = ((regions[i].limit & 0xfff000) << (16 - 12)) |
((regions[i].base & 0xfff000) >> 12);
else
frba[i] = 0x00000fff;
}
if (fseek(f, FRBA_OFFSET, SEEK_SET)) {
perror("Failed to seek to frba");
exit(EXIT_FAILURE);
}
if (fwrite(frba, sizeof(frba), 1, f) != 1) {
fprintf(stderr, "Failed to write frba.\n");
exit(EXIT_FAILURE);
}
fclose(f);
}
static int parse_region(const char *_arg, region_t *const region)
{
char *const start = strdup(_arg);
if (!start) {
fprintf(stderr, "Out of memory.\n");
exit(EXIT_FAILURE);
}
char *const colon = strchr(start, ':');
if (!colon) {
free(start);
return -1;
}
*colon = '\0';
char *const end = colon + 1;
errno = 0;
region->base = strtoul(start, NULL, 0);
region->limit = strtoul(end, NULL, 0);
region->size = region->limit - region->base + 1;
free(start);
if (errno) {
perror("Failed to parse region");
return -1;
} else {
return 0;
}
}
static void print_usage(const char *name)
{
printf("usage: %s [(-b|-m|-g|-p) <start>:<end>]... <output file>\n", name);
printf("\n"
" -b | --bios <start>:<end> BIOS region\n"
" -m | --me <start>:<end> Intel ME region\n"
" -g | --gbe <start>:<end> Gigabit Ethernet region\n"
" -p | --platform <start>:<end> Platform Data region\n"
" -h | --help print this help\n\n"
"<start> and <end> bounds are given in bytes, the <end> bound is inclusive.\n"
"All regions must be multiples of 4K in size and 4K aligned.\n"
"The descriptor region always resides in the first 4K.\n\n"
"An IFD created with ifdfake won't work as a replacement for a real IFD.\n"
"Never try to flash such an IFD to your board!\n\n");
}
int main(int argc, char *argv[])
{
int opt, option_index = 0, idx;
region_t regions[5];
memset(regions, 0x00, sizeof(regions));
static struct option long_options[] = {
{"bios", 1, NULL, 'b'},
{"me", 1, NULL, 'm'},
{"gbe", 1, NULL, 'g'},
{"platform", 1, NULL, 'p'},
{"help", 0, NULL, 'h'},
{0, 0, 0, 0}
};
while ((opt = getopt_long(argc, argv, "b:m:g:p:h?",
long_options, &option_index)) != EOF) {
switch (opt) {
case 'b': case 'm': case 'g': case 'p':
switch (opt) {
case 'b': idx = 1; break;
case 'm': idx = 2; break;
case 'g': idx = 3; break;
case 'p': idx = 4; break;
default: idx = 0; break; /* can't happen */
}
if (parse_region(optarg, ®ions[idx])) {
print_usage(argv[0]);
exit(EXIT_FAILURE);
}
break;
case 'h':
case '?':
default:
print_usage(argv[0]);
exit(EXIT_SUCCESS);
break;
}
}
if (optind + 1 != argc) {
fprintf(stderr, "No output file given.\n\n");
print_usage(argv[0]);
exit(EXIT_FAILURE);
}
regions[0].base = 0x00000000;
regions[0].limit = 0x00000fff;
regions[0].size = 0x00001000;
for (idx = 1; idx < 5; ++idx) {
if (regions[idx].size) {
if (regions[idx].base & 0xfff)
fprintf(stderr, "Region %d is "
"not 4K aligned.\n", idx);
else if (regions[idx].size & 0xfff)
fprintf(stderr, "Region %d size is "
"no multiple of 4K.\n", idx);
else if (regions[idx].limit <= regions[idx].base)
fprintf(stderr, "Region %d is empty.\n", idx);
else
continue;
print_usage(argv[0]);
exit(EXIT_FAILURE);
}
}
write_image(regions, argv[optind]);
return 0;
}
|
