1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2
3 #include "storage.h"
4
5 #include <assert.h>
6 #include <stdio.h>
7
8 #include "commonlib/bsd/compiler.h"
9 #include "fmap.h"
10
11 #include "fv.h"
12 #include "utils.h"
13
storage_open(const char store_file[],struct storage_t * storage,bool rw)14 bool storage_open(const char store_file[], struct storage_t *storage, bool rw)
15 {
16 storage->rw = rw;
17
18 storage->file = map_file(store_file, rw);
19 if (storage->file.start == NULL) {
20 fprintf(stderr, "Failed to load smm-store-file \"%s\"\n",
21 store_file);
22 return false;
23 }
24
25 /* If we won't find FMAP with SMMSTORE, use the whole file, but fail if
26 * FMAP is there without SMMSTORE. */
27 storage->region = storage->file;
28
29 long fmap_offset = fmap_find(storage->file.start, storage->file.length);
30 if (fmap_offset >= 0) {
31 struct fmap *fmap = (void *)(storage->file.start + fmap_offset);
32 const struct fmap_area *area = fmap_find_area(fmap, "SMMSTORE");
33 if (area == NULL) {
34 fprintf(stderr,
35 "Found FMAP without SMMSTORE in \"%s\"\n",
36 store_file);
37 return false;
38 }
39
40 storage->region.start += area->offset;
41 storage->region.length = area->size;
42 }
43
44 bool auth_vars;
45 if (!fv_parse(storage->region, &storage->store_area, &auth_vars)) {
46 if (!rw) {
47 fprintf(stderr,
48 "Failed to find variable store in \"%s\"\n",
49 store_file);
50 goto error;
51 }
52
53 fprintf(stderr,
54 "\nThe variable store has not been found in the ROM image\n"
55 "and is about to be initialized. This situation is normal\n"
56 "for a release image, as the variable store is usually\n"
57 "initialized on the first boot of the platform.\n\n");
58
59 if (!fv_init(storage->region)) {
60 fprintf(stderr,
61 "Failed to create variable store in \"%s\"\n",
62 store_file);
63 goto error;
64 }
65
66 if (!fv_parse(storage->region, &storage->store_area, &auth_vars)) {
67 fprintf(stderr,
68 "Failed to parse newly formatted store in \"%s\"\n",
69 store_file);
70 goto error;
71 }
72
73 fprintf(stderr,
74 "Successfully created variable store in \"%s\"\n",
75 store_file);
76 }
77
78 storage->vs = vs_load(storage->store_area, auth_vars);
79 return true;
80
81 error:
82 unmap_file(storage->file);
83 return false;
84 }
85
storage_write_back(struct storage_t * storage)86 bool storage_write_back(struct storage_t *storage)
87 {
88 assert(storage->rw && "Only RW storage can be updated.");
89
90 bool success = vs_store(&storage->vs, storage->store_area);
91 if (!success)
92 fprintf(stderr, "Failed to update variable store\n");
93 storage_drop(storage);
94 return success;
95 }
96
storage_drop(struct storage_t * storage)97 void storage_drop(struct storage_t *storage)
98 {
99 unmap_file(storage->file);
100 vs_free(&storage->vs);
101 }
102