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
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "storage.h"
#include <assert.h>
#include <stdio.h>
#include "commonlib/bsd/compiler.h"
#include "fmap.h"
#include "fv.h"
#include "utils.h"
bool storage_open(const char store_file[], struct storage_t *storage, bool rw)
{
storage->rw = rw;
storage->file = map_file(store_file, rw);
if (storage->file.start == NULL) {
fprintf(stderr, "Failed to load smm-store-file \"%s\"\n",
store_file);
return false;
}
/* If we won't find FMAP with SMMSTORE, use the whole file, but fail if
* FMAP is there without SMMSTORE. */
storage->region = storage->file;
long fmap_offset = fmap_find(storage->file.start, storage->file.length);
if (fmap_offset >= 0) {
struct fmap *fmap = (void *)(storage->file.start + fmap_offset);
const struct fmap_area *area = fmap_find_area(fmap, "SMMSTORE");
if (area == NULL) {
fprintf(stderr,
"Found FMAP without SMMSTORE in \"%s\"\n",
store_file);
return false;
}
storage->region.start += area->offset;
storage->region.length = area->size;
}
bool auth_vars;
if (!fv_parse(storage->region, &storage->store_area, &auth_vars)) {
if (!rw) {
fprintf(stderr,
"Failed to find variable store in \"%s\"\n",
store_file);
goto error;
}
fprintf(stderr,
"\nThe variable store has not been found in the ROM image\n"
"and is about to be initialized. This situation is normal\n"
"for a release image, as the variable store is usually\n"
"initialized on the first boot of the platform.\n\n");
if (!fv_init(storage->region)) {
fprintf(stderr,
"Failed to create variable store in \"%s\"\n",
store_file);
goto error;
}
if (!fv_parse(storage->region, &storage->store_area, &auth_vars)) {
fprintf(stderr,
"Failed to parse newly formatted store in \"%s\"\n",
store_file);
goto error;
}
fprintf(stderr,
"Successfully created variable store in \"%s\"\n",
store_file);
}
storage->vs = vs_load(storage->store_area, auth_vars);
return true;
error:
unmap_file(storage->file);
return false;
}
bool storage_write_back(struct storage_t *storage)
{
assert(storage->rw && "Only RW storage can be updated.");
bool success = vs_store(&storage->vs, storage->store_area);
if (!success)
fprintf(stderr, "Failed to update variable store\n");
storage_drop(storage);
return success;
}
void storage_drop(struct storage_t *storage)
{
unmap_file(storage->file);
vs_free(&storage->vs);
}
|
