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,
48 * struct cbfs_header - header at the start of a CBFS region
50 * All fields use big-endian format.
52 * @magic: Magic number (CBFS_HEADER_MAGIC)
64 struct cbfs_fileheader {
68 /* offset to struct cbfs_file_attribute or 0 */
69 u32 attributes_offset;
75 * Depending on how the header was initialized, it may be backed with 0x00 or
76 * 0xff, so support both
78 #define CBFS_FILE_ATTR_TAG_UNUSED 0
79 #define CBFS_FILE_ATTR_TAG_UNUSED2 0xffffffff
80 #define CBFS_FILE_ATTR_TAG_COMPRESSION 0x42435a4c
81 #define CBFS_FILE_ATTR_TAG_HASH 0x68736148
84 * The common fields of extended cbfs file attributes. Attributes are expected
85 * to start with tag/len, then append their specific fields
87 struct cbfs_file_attribute {
89 /* len covers the whole structure, incl. tag and len */
94 struct cbfs_file_attr_compression {
97 /* whole file compression format. 0 if no compression. */
99 u32 decompressed_size;
102 struct cbfs_file_attr_hash {
106 /* hash_data is len - sizeof(struct) bytes */
110 struct cbfs_cachenode {
111 struct cbfs_cachenode *next;
121 * file_cbfs_error() - Return a string describing the most recent error
124 * @return A pointer to the constant string.
126 const char *file_cbfs_error(void);
129 * cbfs_get_result() - Get the result of the last CBFS operation
133 enum cbfs_result cbfs_get_result(void);
136 * file_cbfs_init() - Initialize the CBFS driver and load metadata into RAM.
138 * @end_of_rom: Points to the end of the ROM the CBFS should be read from
139 * @return 0 if OK, -ve on error
141 int file_cbfs_init(ulong end_of_rom);
144 * file_cbfs_get_header() - Get the header structure for the current CBFS.
146 * @return A pointer to the constant structure, or NULL if there is none.
148 const struct cbfs_header *file_cbfs_get_header(void);
151 * file_cbfs_get_first() - Get a handle for the first file in CBFS.
153 * @return A handle for the first file in CBFS, NULL on error.
155 const struct cbfs_cachenode *file_cbfs_get_first(void);
158 * file_cbfs_get_next() - Get a handle to the file after this one in CBFS.
160 * @file: A pointer to the handle to advance.
162 void file_cbfs_get_next(const struct cbfs_cachenode **file);
165 * file_cbfs_find() - Find a file with a particular name in CBFS.
167 * @name: The name to search for.
169 * @return A handle to the file, or NULL on error.
171 const struct cbfs_cachenode *file_cbfs_find(const char *name);
176 * cbfs_find_file() - Find a file in a given CBFS
178 * @cbfs: CBFS to look in (use cbfs_init_mem() to set it up)
179 * @name: Filename to look for
180 * @return pointer to CBFS node if found, else NULL
182 const struct cbfs_cachenode *cbfs_find_file(struct cbfs_priv *cbfs,
186 * cbfs_init_mem() - Set up a new CBFS
188 * @base: Base address of CBFS
189 * @cbfsp: Returns a pointer to CBFS on success
190 * @return 0 if OK, -ve on error
192 int cbfs_init_mem(ulong base, struct cbfs_priv **privp);
195 /***************************************************************************/
196 /* All of the functions below can be used without first initializing CBFS. */
197 /***************************************************************************/
200 * file_cbfs_find_uncached() - Find a file in CBFS given the end of the ROM
202 * Note that @node should be declared by the caller. This design is to avoid
203 * the need for allocation here.
205 * @end_of_rom: Points to the end of the ROM the CBFS should be read from
206 * @name: The name to search for
207 * @node: Returns the contents of the node if found (i.e. copied into *node)
208 * @return 0 on success, -ENOENT if not found, -EFAULT on bad header
210 int file_cbfs_find_uncached(ulong end_of_rom, const char *name,
211 struct cbfs_cachenode *node);
214 * file_cbfs_find_uncached_base() - Find a file in CBFS given the base address
216 * Note that @node should be declared by the caller. This design is to avoid
217 * the need for allocation here.
219 * @base: Points to the base of the CBFS
220 * @name: The name to search for
221 * @node: Returns the contents of the node if found (i.e. copied into *node)
222 * @return 0 on success, -ENOENT if not found, -EFAULT on bad header
224 int file_cbfs_find_uncached_base(ulong base, const char *name,
225 struct cbfs_cachenode *node);
228 * file_cbfs_name() - Get the name of a file in CBFS.
230 * @file: The handle to the file.
232 * @return The name of the file, NULL on error.
234 const char *file_cbfs_name(const struct cbfs_cachenode *file);
237 * file_cbfs_size() - Get the size of a file in CBFS.
239 * @file: The handle to the file.
241 * @return The size of the file, zero on error.
243 u32 file_cbfs_size(const struct cbfs_cachenode *file);
246 * file_cbfs_type() - Get the type of a file in CBFS.
248 * @file: The handle to the file.
250 * @return The type of the file, zero on error.
252 u32 file_cbfs_type(const struct cbfs_cachenode *file);
255 * file_cbfs_read() - Read a file from CBFS into RAM
257 * @file: A handle to the file to read.
258 * @buffer: Where to read it into memory.
259 * @maxsize: Maximum number of bytes to read
261 * @return If positive or zero, the number of characters read. If negative, an
264 long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
265 unsigned long maxsize);
267 #endif /* __CBFS_H */