1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
10 #include <asm/byteorder.h>
12 /* Offset of master header from the start of a coreboot ROM */
13 #define MASTER_HDR_OFFSET 0x38
15 static const u32 good_magic = 0x4f524243;
16 static const u8 good_file_magic[] = "LARCHIVE";
19 * struct cbfs_priv - Private data for this driver
21 * @initialised: true if this CBFS has been inited
22 * @start: Start position of CBFS in memory, typically memory-mapped SPI flash
23 * @header: Header read from the CBFS, byte-swapped so U-Boot can access it
24 * @file_cache: List of file headers read from CBFS
25 * @result: Success/error result
30 struct cbfs_header header;
31 struct cbfs_cachenode *file_cache;
32 enum cbfs_result result;
35 static struct cbfs_priv cbfs_s;
37 const char *file_cbfs_error(void)
39 switch (cbfs_s.result) {
42 case CBFS_NOT_INITIALIZED:
43 return "CBFS not initialized";
45 return "Bad CBFS header";
47 return "Bad CBFS file";
48 case CBFS_FILE_NOT_FOUND:
49 return "File not found";
55 enum cbfs_result cbfs_get_result(void)
60 /* Do endian conversion on the CBFS header structure. */
61 static void swap_header(struct cbfs_header *dest, struct cbfs_header *src)
63 dest->magic = be32_to_cpu(src->magic);
64 dest->version = be32_to_cpu(src->version);
65 dest->rom_size = be32_to_cpu(src->rom_size);
66 dest->boot_block_size = be32_to_cpu(src->boot_block_size);
67 dest->align = be32_to_cpu(src->align);
68 dest->offset = be32_to_cpu(src->offset);
71 /* Do endian conversion on a CBFS file header. */
72 static void swap_file_header(struct cbfs_fileheader *dest,
73 const struct cbfs_fileheader *src)
75 memcpy(&dest->magic, &src->magic, sizeof(dest->magic));
76 dest->len = be32_to_cpu(src->len);
77 dest->type = be32_to_cpu(src->type);
78 dest->attributes_offset = be32_to_cpu(src->attributes_offset);
79 dest->offset = be32_to_cpu(src->offset);
83 * Given a starting position in memory, scan forward, bounded by a size, and
84 * find the next valid CBFS file. No memory is allocated by this function. The
85 * caller is responsible for allocating space for the new file structure.
87 * @param start The location in memory to start from.
88 * @param size The size of the memory region to search.
89 * @param align The alignment boundaries to check on.
90 * @param node A pointer to the file structure to load.
91 * @param used A pointer to the count of of bytes scanned through,
92 * including the file if one is found.
94 * @return 0 if a file is found, -ENOENT if one isn't, -EBADF if a bad header
97 static int file_cbfs_next_file(struct cbfs_priv *priv, void *start, int size,
98 int align, struct cbfs_cachenode *node,
101 struct cbfs_fileheader header;
105 while (size >= align) {
106 const struct cbfs_fileheader *file_header = start;
110 /* Check if there's a file here. */
111 if (memcmp(good_file_magic, &file_header->magic,
112 sizeof(file_header->magic))) {
119 swap_file_header(&header, file_header);
120 if (header.offset < sizeof(struct cbfs_fileheader)) {
121 priv->result = CBFS_BAD_FILE;
125 node->type = header.type;
126 node->data = start + header.offset;
127 node->data_length = header.len;
128 name_len = header.offset - sizeof(struct cbfs_fileheader);
129 node->name = (char *)file_header +
130 sizeof(struct cbfs_fileheader);
131 node->name_length = name_len;
132 node->attr_offset = header.attributes_offset;
136 step = step + align - step % align;
145 /* Look through a CBFS instance and copy file metadata into regular memory. */
146 static int file_cbfs_fill_cache(struct cbfs_priv *priv, int size, int align)
148 struct cbfs_cachenode *cache_node;
149 struct cbfs_cachenode *node;
150 struct cbfs_cachenode **cache_tail = &priv->file_cache;
153 /* Clear out old information. */
154 cache_node = priv->file_cache;
156 struct cbfs_cachenode *old_node = cache_node;
157 cache_node = cache_node->next;
160 priv->file_cache = NULL;
163 while (size >= align) {
167 node = (struct cbfs_cachenode *)
168 malloc(sizeof(struct cbfs_cachenode));
171 ret = file_cbfs_next_file(priv, start, size, align, node,
181 cache_tail = &node->next;
186 priv->result = CBFS_SUCCESS;
192 * load_header() - Load the CBFS header
194 * Get the CBFS header out of the ROM and do endian conversion.
196 * @priv: Private data, which is inited by this function
197 * @addr: Address of CBFS header in memory-mapped SPI flash
198 * @return 0 if OK, -ENXIO if the header is bad
200 static int load_header(struct cbfs_priv *priv, ulong addr)
202 struct cbfs_header *header = &priv->header;
203 struct cbfs_header *header_in_rom;
205 memset(priv, '\0', sizeof(*priv));
206 header_in_rom = (struct cbfs_header *)addr;
207 swap_header(header, header_in_rom);
209 if (header->magic != good_magic || header->offset >
210 header->rom_size - header->boot_block_size) {
211 priv->result = CBFS_BAD_HEADER;
219 * file_cbfs_load_header() - Get the CBFS header out of the ROM, given the end
221 * @priv: Private data, which is inited by this function
222 * @end_of_rom: Address of the last byte of the ROM (typically 0xffffffff)
223 * @return 0 if OK, -ENXIO if the header is bad
225 static int file_cbfs_load_header(struct cbfs_priv *priv, ulong end_of_rom)
227 int offset = *(u32 *)(end_of_rom - 3);
230 ret = load_header(priv, end_of_rom + offset + 1);
233 priv->start = (void *)(end_of_rom + 1 - priv->header.rom_size);
239 * cbfs_load_header_ptr() - Get the CBFS header out of the ROM, given the base
241 * @priv: Private data, which is inited by this function
242 * @base: Address of the first byte of the ROM (e.g. 0xff000000)
243 * @return 0 if OK, -ENXIO if the header is bad
245 static int cbfs_load_header_ptr(struct cbfs_priv *priv, ulong base)
249 ret = load_header(priv, base + MASTER_HDR_OFFSET);
252 priv->start = (void *)base;
257 static int cbfs_init(struct cbfs_priv *priv, ulong end_of_rom)
261 ret = file_cbfs_load_header(priv, end_of_rom);
265 ret = file_cbfs_fill_cache(priv, priv->header.rom_size,
269 priv->initialized = true;
274 int file_cbfs_init(ulong end_of_rom)
276 return cbfs_init(&cbfs_s, end_of_rom);
279 int cbfs_init_mem(ulong base, ulong size, bool require_hdr,
280 struct cbfs_priv **privp)
282 struct cbfs_priv priv_s, *priv = &priv_s;
286 * Use a local variable to start with until we know that the * CBFS is
287 * valid. Note that size is detected from the header, if present,
288 * meaning the parameter is ignored.
290 ret = cbfs_load_header_ptr(priv, base);
292 if (require_hdr || size == CBFS_SIZE_UNKNOWN)
294 memset(priv, '\0', sizeof(struct cbfs_priv));
295 priv->header.rom_size = size;
296 priv->header.align = CBFS_ALIGN_SIZE;
297 priv->start = (void *)base;
300 ret = file_cbfs_fill_cache(priv, priv->header.rom_size,
303 return log_msg_ret("fill", ret);
305 priv->initialized = true;
306 priv = malloc(sizeof(priv_s));
309 memcpy(priv, &priv_s, sizeof(priv_s));
315 const struct cbfs_header *file_cbfs_get_header(void)
317 struct cbfs_priv *priv = &cbfs_s;
319 if (priv->initialized) {
320 priv->result = CBFS_SUCCESS;
321 return &priv->header;
323 priv->result = CBFS_NOT_INITIALIZED;
328 const struct cbfs_cachenode *cbfs_get_first(const struct cbfs_priv *priv)
330 return priv->file_cache;
333 void cbfs_get_next(const struct cbfs_cachenode **filep)
336 *filep = (*filep)->next;
339 const struct cbfs_cachenode *file_cbfs_get_first(void)
341 struct cbfs_priv *priv = &cbfs_s;
343 if (!priv->initialized) {
344 priv->result = CBFS_NOT_INITIALIZED;
347 priv->result = CBFS_SUCCESS;
348 return priv->file_cache;
352 void file_cbfs_get_next(const struct cbfs_cachenode **file)
354 struct cbfs_priv *priv = &cbfs_s;
356 if (!priv->initialized) {
357 priv->result = CBFS_NOT_INITIALIZED;
363 *file = (*file)->next;
364 priv->result = CBFS_SUCCESS;
367 const struct cbfs_cachenode *cbfs_find_file(struct cbfs_priv *priv,
370 struct cbfs_cachenode *cache_node = priv->file_cache;
372 if (!priv->initialized) {
373 priv->result = CBFS_NOT_INITIALIZED;
378 if (!strcmp(name, cache_node->name))
380 cache_node = cache_node->next;
383 priv->result = CBFS_FILE_NOT_FOUND;
385 priv->result = CBFS_SUCCESS;
390 const struct cbfs_cachenode *file_cbfs_find(const char *name)
392 return cbfs_find_file(&cbfs_s, name);
395 static int find_uncached(struct cbfs_priv *priv, const char *name, void *start,
396 struct cbfs_cachenode *node)
398 int size = priv->header.rom_size;
399 int align = priv->header.align;
401 while (size >= align) {
405 ret = file_cbfs_next_file(priv, start, size, align, node,
411 if (!strcmp(name, node->name))
417 priv->result = CBFS_FILE_NOT_FOUND;
422 int file_cbfs_find_uncached(ulong end_of_rom, const char *name,
423 struct cbfs_cachenode *node)
425 struct cbfs_priv priv;
429 ret = file_cbfs_load_header(&priv, end_of_rom);
434 return find_uncached(&priv, name, start, node);
437 int file_cbfs_find_uncached_base(ulong base, const char *name,
438 struct cbfs_cachenode *node)
440 struct cbfs_priv priv;
443 ret = cbfs_load_header_ptr(&priv, base);
447 return find_uncached(&priv, name, (void *)base, node);
450 const char *file_cbfs_name(const struct cbfs_cachenode *file)
452 cbfs_s.result = CBFS_SUCCESS;
457 u32 file_cbfs_size(const struct cbfs_cachenode *file)
459 cbfs_s.result = CBFS_SUCCESS;
461 return file->data_length;
464 u32 file_cbfs_type(const struct cbfs_cachenode *file)
466 cbfs_s.result = CBFS_SUCCESS;
471 long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
472 unsigned long maxsize)
476 size = file->data_length;
477 if (maxsize && size > maxsize)
480 memcpy(buffer, file->data, size);
481 cbfs_s.result = CBFS_SUCCESS;