1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
10 #include <linux/compiler.h>
21 CBFS_TYPE_BOOTBLOCK = 0x01,
22 CBFS_TYPE_CBFSHEADER = 0x02,
23 CBFS_TYPE_STAGE = 0x10,
24 CBFS_TYPE_PAYLOAD = 0x20,
26 CBFS_TYPE_OPTIONROM = 0x30,
27 CBFS_TYPE_BOOTSPLASH = 0x40,
31 CBFS_TYPE_MICROCODE = 0x53,
36 CBFS_TYPE_STRUCT = 0x70,
37 CBFS_TYPE_CMOS_DEFAULT = 0xaa,
39 CBFS_TYPE_MRC_CACHE = 0xac,
40 CBFS_TYPE_CMOS_LAYOUT = 0x01aa
44 CBFS_HEADER_MAGIC = 0x4f524243,
45 CBFS_SIZE_UNKNOWN = 0xffffffff,
46 CBFS_ALIGN_SIZE = 0x40,
50 * struct cbfs_header - header at the start of a CBFS region
52 * All fields use big-endian format.
54 * @magic: Magic number (CBFS_HEADER_MAGIC)
66 struct cbfs_fileheader {
70 /* offset to struct cbfs_file_attribute or 0 */
71 u32 attributes_offset;
77 * Depending on how the header was initialized, it may be backed with 0x00 or
78 * 0xff, so support both
80 #define CBFS_FILE_ATTR_TAG_UNUSED 0
81 #define CBFS_FILE_ATTR_TAG_UNUSED2 0xffffffff
82 #define CBFS_FILE_ATTR_TAG_COMPRESSION 0x42435a4c
83 #define CBFS_FILE_ATTR_TAG_HASH 0x68736148
86 * The common fields of extended cbfs file attributes. Attributes are expected
87 * to start with tag/len, then append their specific fields
89 struct cbfs_file_attribute {
91 /* len covers the whole structure, incl. tag and len */
96 struct cbfs_file_attr_compression {
99 /* whole file compression format. 0 if no compression. */
101 u32 decompressed_size;
104 struct cbfs_file_attr_hash {
108 /* hash_data is len - sizeof(struct) bytes */
112 struct cbfs_cachenode {
113 struct cbfs_cachenode *next;
123 * file_cbfs_error() - Return a string describing the most recent error
126 * @return A pointer to the constant string.
128 const char *file_cbfs_error(void);
131 * cbfs_get_result() - Get the result of the last CBFS operation
135 enum cbfs_result cbfs_get_result(void);
138 * file_cbfs_init() - Initialize the CBFS driver and load metadata into RAM.
140 * @end_of_rom: Points to the end of the ROM the CBFS should be read from
141 * @return 0 if OK, -ve on error
143 int file_cbfs_init(ulong end_of_rom);
146 * file_cbfs_get_header() - Get the header structure for the current CBFS.
148 * @return A pointer to the constant structure, or NULL if there is none.
150 const struct cbfs_header *file_cbfs_get_header(void);
153 * file_cbfs_get_first() - Get a handle for the first file in CBFS.
155 * @return A handle for the first file in CBFS, NULL on error.
157 const struct cbfs_cachenode *file_cbfs_get_first(void);
160 * file_cbfs_get_next() - Get a handle to the file after this one in CBFS.
162 * @file: A pointer to the handle to advance.
164 void file_cbfs_get_next(const struct cbfs_cachenode **file);
167 * file_cbfs_find() - Find a file with a particular name in CBFS.
169 * @name: The name to search for.
171 * @return A handle to the file, or NULL on error.
173 const struct cbfs_cachenode *file_cbfs_find(const char *name);
178 * cbfs_find_file() - Find a file in a given CBFS
180 * @cbfs: CBFS to look in (use cbfs_init_mem() to set it up)
181 * @name: Filename to look for
182 * @return pointer to CBFS node if found, else NULL
184 const struct cbfs_cachenode *cbfs_find_file(struct cbfs_priv *cbfs,
188 * cbfs_init_mem() - Set up a new CBFS
190 * @base: Base address of CBFS
191 * @size: Size of CBFS if known, else CBFS_SIZE_UNKNOWN
192 * @require_header: true to read a header at the start, false to not require one
193 * @cbfsp: Returns a pointer to CBFS on success
194 * @return 0 if OK, -ve on error
196 int cbfs_init_mem(ulong base, ulong size, bool require_hdr,
197 struct cbfs_priv **privp);
199 /***************************************************************************/
200 /* All of the functions below can be used without first initializing CBFS. */
201 /***************************************************************************/
204 * file_cbfs_find_uncached() - Find a file in CBFS given the end of the ROM
206 * Note that @node should be declared by the caller. This design is to avoid
207 * the need for allocation here.
209 * @end_of_rom: Points to the end of the ROM the CBFS should be read from
210 * @name: The name to search for
211 * @node: Returns the contents of the node if found (i.e. copied into *node)
212 * @return 0 on success, -ENOENT if not found, -EFAULT on bad header
214 int file_cbfs_find_uncached(ulong end_of_rom, const char *name,
215 struct cbfs_cachenode *node);
218 * file_cbfs_find_uncached_base() - Find a file in CBFS given the base address
220 * Note that @node should be declared by the caller. This design is to avoid
221 * the need for allocation here.
223 * @base: Points to the base of the CBFS
224 * @name: The name to search for
225 * @node: Returns the contents of the node if found (i.e. copied into *node)
226 * @return 0 on success, -ENOENT if not found, -EFAULT on bad header
228 int file_cbfs_find_uncached_base(ulong base, const char *name,
229 struct cbfs_cachenode *node);
232 * file_cbfs_name() - Get the name of a file in CBFS.
234 * @file: The handle to the file.
236 * @return The name of the file, NULL on error.
238 const char *file_cbfs_name(const struct cbfs_cachenode *file);
241 * file_cbfs_size() - Get the size of a file in CBFS.
243 * @file: The handle to the file.
245 * @return The size of the file, zero on error.
247 u32 file_cbfs_size(const struct cbfs_cachenode *file);
250 * file_cbfs_type() - Get the type of a file in CBFS.
252 * @file: The handle to the file.
254 * @return The type of the file, zero on error.
256 u32 file_cbfs_type(const struct cbfs_cachenode *file);
259 * file_cbfs_read() - Read a file from CBFS into RAM
261 * @file: A handle to the file to read.
262 * @buffer: Where to read it into memory.
263 * @maxsize: Maximum number of bytes to read
265 * @return If positive or zero, the number of characters read. If negative, an
268 long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
269 unsigned long maxsize);
271 #endif /* __CBFS_H */