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Gabe Black84cd9322012-10-12 14:26:11 +00001/*
2 * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
3 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02004 * SPDX-License-Identifier: GPL-2.0+
Gabe Black84cd9322012-10-12 14:26:11 +00005 */
6
Guillaume GARDET7a77e902016-06-17 11:45:37 +02007#include <common.h>
Gabe Black84cd9322012-10-12 14:26:11 +00008#include <cbfs.h>
9#include <malloc.h>
10#include <asm/byteorder.h>
11
12enum cbfs_result file_cbfs_result;
13
14const char *file_cbfs_error(void)
15{
16 switch (file_cbfs_result) {
17 case CBFS_SUCCESS:
18 return "Success";
19 case CBFS_NOT_INITIALIZED:
20 return "CBFS not initialized";
21 case CBFS_BAD_HEADER:
22 return "Bad CBFS header";
23 case CBFS_BAD_FILE:
24 return "Bad CBFS file";
25 case CBFS_FILE_NOT_FOUND:
26 return "File not found";
27 default:
28 return "Unknown";
29 }
30}
31
32
33static const u32 good_magic = 0x4f524243;
34static const u8 good_file_magic[] = "LARCHIVE";
35
36
37static int initialized;
38static struct cbfs_header cbfs_header;
39static struct cbfs_cachenode *file_cache;
40
41/* Do endian conversion on the CBFS header structure. */
42static void swap_header(struct cbfs_header *dest, struct cbfs_header *src)
43{
44 dest->magic = be32_to_cpu(src->magic);
45 dest->version = be32_to_cpu(src->version);
46 dest->rom_size = be32_to_cpu(src->rom_size);
47 dest->boot_block_size = be32_to_cpu(src->boot_block_size);
48 dest->align = be32_to_cpu(src->align);
49 dest->offset = be32_to_cpu(src->offset);
50}
51
52/* Do endian conversion on a CBFS file header. */
53static void swap_file_header(struct cbfs_fileheader *dest,
54 const struct cbfs_fileheader *src)
55{
56 memcpy(&dest->magic, &src->magic, sizeof(dest->magic));
57 dest->len = be32_to_cpu(src->len);
58 dest->type = be32_to_cpu(src->type);
59 dest->checksum = be32_to_cpu(src->checksum);
60 dest->offset = be32_to_cpu(src->offset);
61}
62
63/*
64 * Given a starting position in memory, scan forward, bounded by a size, and
65 * find the next valid CBFS file. No memory is allocated by this function. The
66 * caller is responsible for allocating space for the new file structure.
67 *
68 * @param start The location in memory to start from.
69 * @param size The size of the memory region to search.
70 * @param align The alignment boundaries to check on.
71 * @param newNode A pointer to the file structure to load.
72 * @param used A pointer to the count of of bytes scanned through,
73 * including the file if one is found.
74 *
75 * @return 1 if a file is found, 0 if one isn't.
76 */
77static int file_cbfs_next_file(u8 *start, u32 size, u32 align,
78 struct cbfs_cachenode *newNode, u32 *used)
79{
80 struct cbfs_fileheader header;
81
82 *used = 0;
83
84 while (size >= align) {
85 const struct cbfs_fileheader *fileHeader =
86 (const struct cbfs_fileheader *)start;
87 u32 name_len;
88 u32 step;
89
90 /* Check if there's a file here. */
91 if (memcmp(good_file_magic, &(fileHeader->magic),
92 sizeof(fileHeader->magic))) {
93 *used += align;
94 size -= align;
95 start += align;
96 continue;
97 }
98
99 swap_file_header(&header, fileHeader);
Yaroslav Kcc7ed262016-08-08 20:32:15 -0700100 if (header.offset < sizeof(struct cbfs_fileheader) ||
101 header.offset > header.len) {
Gabe Black84cd9322012-10-12 14:26:11 +0000102 file_cbfs_result = CBFS_BAD_FILE;
103 return -1;
104 }
105 newNode->next = NULL;
106 newNode->type = header.type;
107 newNode->data = start + header.offset;
108 newNode->data_length = header.len;
Yaroslav Kcc7ed262016-08-08 20:32:15 -0700109 name_len = header.offset - sizeof(struct cbfs_fileheader);
Gabe Black84cd9322012-10-12 14:26:11 +0000110 newNode->name = (char *)fileHeader +
Yaroslav Kcc7ed262016-08-08 20:32:15 -0700111 sizeof(struct cbfs_fileheader);
Gabe Black84cd9322012-10-12 14:26:11 +0000112 newNode->name_length = name_len;
113 newNode->checksum = header.checksum;
114
115 step = header.len;
116 if (step % align)
117 step = step + align - step % align;
118
119 *used += step;
120 return 1;
121 }
122 return 0;
123}
124
125/* Look through a CBFS instance and copy file metadata into regular memory. */
126static void file_cbfs_fill_cache(u8 *start, u32 size, u32 align)
127{
128 struct cbfs_cachenode *cache_node;
129 struct cbfs_cachenode *newNode;
130 struct cbfs_cachenode **cache_tail = &file_cache;
131
132 /* Clear out old information. */
133 cache_node = file_cache;
134 while (cache_node) {
135 struct cbfs_cachenode *oldNode = cache_node;
136 cache_node = cache_node->next;
137 free(oldNode);
138 }
139 file_cache = NULL;
140
141 while (size >= align) {
142 int result;
143 u32 used;
144
145 newNode = (struct cbfs_cachenode *)
146 malloc(sizeof(struct cbfs_cachenode));
147 result = file_cbfs_next_file(start, size, align,
148 newNode, &used);
149
150 if (result < 0) {
151 free(newNode);
152 return;
153 } else if (result == 0) {
154 free(newNode);
155 break;
156 }
157 *cache_tail = newNode;
158 cache_tail = &newNode->next;
159
160 size -= used;
161 start += used;
162 }
163 file_cbfs_result = CBFS_SUCCESS;
164}
165
166/* Get the CBFS header out of the ROM and do endian conversion. */
167static int file_cbfs_load_header(uintptr_t end_of_rom,
168 struct cbfs_header *header)
169{
170 struct cbfs_header *header_in_rom;
Andre Heider44683172018-02-15 07:40:11 +0100171 int32_t offset = *(u32 *)(end_of_rom - 3);
Gabe Black84cd9322012-10-12 14:26:11 +0000172
Andre Heider44683172018-02-15 07:40:11 +0100173 header_in_rom = (struct cbfs_header *)(end_of_rom + offset + 1);
Gabe Black84cd9322012-10-12 14:26:11 +0000174 swap_header(header, header_in_rom);
175
176 if (header->magic != good_magic || header->offset >
177 header->rom_size - header->boot_block_size) {
178 file_cbfs_result = CBFS_BAD_HEADER;
179 return 1;
180 }
181 return 0;
182}
183
184void file_cbfs_init(uintptr_t end_of_rom)
185{
186 u8 *start_of_rom;
187 initialized = 0;
188
189 if (file_cbfs_load_header(end_of_rom, &cbfs_header))
190 return;
191
192 start_of_rom = (u8 *)(end_of_rom + 1 - cbfs_header.rom_size);
193
194 file_cbfs_fill_cache(start_of_rom + cbfs_header.offset,
195 cbfs_header.rom_size, cbfs_header.align);
196 if (file_cbfs_result == CBFS_SUCCESS)
197 initialized = 1;
198}
199
200const struct cbfs_header *file_cbfs_get_header(void)
201{
202 if (initialized) {
203 file_cbfs_result = CBFS_SUCCESS;
204 return &cbfs_header;
205 } else {
206 file_cbfs_result = CBFS_NOT_INITIALIZED;
207 return NULL;
208 }
209}
210
211const struct cbfs_cachenode *file_cbfs_get_first(void)
212{
213 if (!initialized) {
214 file_cbfs_result = CBFS_NOT_INITIALIZED;
215 return NULL;
216 } else {
217 file_cbfs_result = CBFS_SUCCESS;
218 return file_cache;
219 }
220}
221
222void file_cbfs_get_next(const struct cbfs_cachenode **file)
223{
224 if (!initialized) {
225 file_cbfs_result = CBFS_NOT_INITIALIZED;
226 file = NULL;
227 return;
228 }
229
230 if (*file)
231 *file = (*file)->next;
232 file_cbfs_result = CBFS_SUCCESS;
233}
234
235const struct cbfs_cachenode *file_cbfs_find(const char *name)
236{
237 struct cbfs_cachenode *cache_node = file_cache;
238
239 if (!initialized) {
240 file_cbfs_result = CBFS_NOT_INITIALIZED;
241 return NULL;
242 }
243
244 while (cache_node) {
245 if (!strcmp(name, cache_node->name))
246 break;
247 cache_node = cache_node->next;
248 }
249 if (!cache_node)
250 file_cbfs_result = CBFS_FILE_NOT_FOUND;
251 else
252 file_cbfs_result = CBFS_SUCCESS;
253
254 return cache_node;
255}
256
257const struct cbfs_cachenode *file_cbfs_find_uncached(uintptr_t end_of_rom,
258 const char *name)
259{
260 u8 *start;
261 u32 size;
262 u32 align;
263 static struct cbfs_cachenode node;
264
265 if (file_cbfs_load_header(end_of_rom, &cbfs_header))
266 return NULL;
267
268 start = (u8 *)(end_of_rom + 1 - cbfs_header.rom_size);
269 size = cbfs_header.rom_size;
270 align = cbfs_header.align;
271
272 while (size >= align) {
273 int result;
274 u32 used;
275
276 result = file_cbfs_next_file(start, size, align, &node, &used);
277
278 if (result < 0)
279 return NULL;
280 else if (result == 0)
281 break;
282
283 if (!strcmp(name, node.name))
284 return &node;
285
286 size -= used;
287 start += used;
288 }
289 file_cbfs_result = CBFS_FILE_NOT_FOUND;
290 return NULL;
291}
292
293const char *file_cbfs_name(const struct cbfs_cachenode *file)
294{
295 file_cbfs_result = CBFS_SUCCESS;
296 return file->name;
297}
298
299u32 file_cbfs_size(const struct cbfs_cachenode *file)
300{
301 file_cbfs_result = CBFS_SUCCESS;
302 return file->data_length;
303}
304
305u32 file_cbfs_type(const struct cbfs_cachenode *file)
306{
307 file_cbfs_result = CBFS_SUCCESS;
308 return file->type;
309}
310
311long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
312 unsigned long maxsize)
313{
314 u32 size;
315
316 size = file->data_length;
317 if (maxsize && size > maxsize)
318 size = maxsize;
319
320 memcpy(buffer, file->data, size);
321
322 file_cbfs_result = CBFS_SUCCESS;
323 return size;
324}