1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
10 #include <linux/compiler.h>
23 CBFS_TYPE_BOOTBLOCK = 0x01,
24 CBFS_TYPE_CBFSHEADER = 0x02,
25 CBFS_TYPE_LEGACY_STAGE = 0x10,
26 CBFS_TYPE_PAYLOAD = 0x20,
27 CBFS_TYPE_SELF = CBFS_TYPE_PAYLOAD,
30 CBFS_TYPE_OPTIONROM = 0x30,
31 CBFS_TYPE_BOOTSPLASH = 0x40,
35 CBFS_TYPE_MICROCODE = 0x53,
40 CBFS_TYPE_STRUCT = 0x70,
41 CBFS_TYPE_CMOS_DEFAULT = 0xaa,
43 CBFS_TYPE_MRC_CACHE = 0xac,
44 CBFS_TYPE_CMOS_LAYOUT = 0x01aa
48 CBFS_HEADER_MAGIC = 0x4f524243,
49 CBFS_SIZE_UNKNOWN = 0xffffffff,
50 CBFS_ALIGN_SIZE = 0x40,
54 * struct cbfs_header - header at the start of a CBFS region
56 * All fields use big-endian format.
58 * @magic: Magic number (CBFS_HEADER_MAGIC)
70 struct cbfs_fileheader {
74 /* offset to struct cbfs_file_attribute or 0 */
75 u32 attributes_offset;
81 * These are standard values for the known compression alogrithms that coreboot
82 * knows about for stages and payloads. Of course, other CBFS users can use
83 * whatever values they want, as long as they understand them.
85 #define CBFS_COMPRESS_NONE 0
86 #define CBFS_COMPRESS_LZMA 1
87 #define CBFS_COMPRESS_LZ4 2
90 * Depending on how the header was initialized, it may be backed with 0x00 or
91 * 0xff, so support both
93 #define CBFS_FILE_ATTR_TAG_UNUSED 0
94 #define CBFS_FILE_ATTR_TAG_UNUSED2 0xffffffff
95 #define CBFS_FILE_ATTR_TAG_COMPRESSION 0x42435a4c
96 #define CBFS_FILE_ATTR_TAG_HASH 0x68736148
99 * The common fields of extended cbfs file attributes. Attributes are expected
100 * to start with tag/len, then append their specific fields
102 struct cbfs_file_attribute {
104 /* len covers the whole structure, incl. tag and len */
109 struct cbfs_file_attr_compression {
112 /* whole file compression format. 0 if no compression. */
114 u32 decompressed_size;
117 struct cbfs_file_attr_hash {
121 /* hash_data is len - sizeof(struct) bytes */
125 /*** Component sub-headers ***/
127 /* Following are component sub-headers for the "standard" component types */
130 * struct cbfs_stage - sub-header for stage components
132 * Stages are loaded by coreboot during the normal boot process
135 u32 compression; /** Compression type */
136 u64 entry; /** entry point */
137 u64 load; /** Where to load in memory */
138 u32 len; /** length of data to load */
139 u32 memlen; /** total length of object in memory */
143 * struct cbfs_payload_segment - sub-header for payload components
145 * Payloads are loaded by coreboot at the end of the boot process
147 struct cbfs_payload_segment {
156 struct cbfs_payload {
157 struct cbfs_payload_segment segments;
160 #define PAYLOAD_SEGMENT_CODE 0x45444F43
161 #define PAYLOAD_SEGMENT_DATA 0x41544144
162 #define PAYLOAD_SEGMENT_BSS 0x20535342
163 #define PAYLOAD_SEGMENT_PARAMS 0x41524150
164 #define PAYLOAD_SEGMENT_ENTRY 0x52544E45
166 struct cbfs_cachenode {
167 struct cbfs_cachenode *next;
179 * file_cbfs_error() - Return a string describing the most recent error
182 * Return: A pointer to the constant string.
184 const char *file_cbfs_error(void);
187 * cbfs_get_result() - Get the result of the last CBFS operation
191 enum cbfs_result cbfs_get_result(void);
194 * file_cbfs_init() - Initialize the CBFS driver and load metadata into RAM.
196 * @end_of_rom: Points to the end of the ROM the CBFS should be read from
197 * Return: 0 if OK, -ve on error
199 int file_cbfs_init(ulong end_of_rom);
202 * file_cbfs_get_header() - Get the header structure for the current CBFS.
204 * Return: A pointer to the constant structure, or NULL if there is none.
206 const struct cbfs_header *file_cbfs_get_header(void);
209 * cbfs_get_first() - Get the first file in a CBFS
211 * Return: pointer to first file, or NULL if it is empty
213 const struct cbfs_cachenode *cbfs_get_first(const struct cbfs_priv *priv);
216 * cbfs_get_next() - Get the next file in a CBFS
218 * @filep: Pointer to current file; updated to point to the next file, if any,
221 void cbfs_get_next(const struct cbfs_cachenode **filep);
224 * file_cbfs_get_first() - Get a handle for the first file in CBFS.
226 * Return: A handle for the first file in CBFS, NULL on error.
228 const struct cbfs_cachenode *file_cbfs_get_first(void);
231 * file_cbfs_get_next() - Get a handle to the file after this one in CBFS.
233 * @file: A pointer to the handle to advance.
235 void file_cbfs_get_next(const struct cbfs_cachenode **file);
238 * file_cbfs_find() - Find a file with a particular name in CBFS.
240 * @name: The name to search for.
242 * Return: A handle to the file, or NULL on error.
244 const struct cbfs_cachenode *file_cbfs_find(const char *name);
247 * cbfs_find_file() - Find a file in a given CBFS
249 * @cbfs: CBFS to look in (use cbfs_init_mem() to set it up)
250 * @name: Filename to look for
251 * Return: pointer to CBFS node if found, else NULL
253 const struct cbfs_cachenode *cbfs_find_file(struct cbfs_priv *cbfs,
257 * cbfs_init_mem() - Set up a new CBFS
259 * @base: Base address of CBFS
260 * @size: Size of CBFS if known, else CBFS_SIZE_UNKNOWN
261 * @require_header: true to read a header at the start, false to not require one
262 * @cbfsp: Returns a pointer to CBFS on success
263 * Return: 0 if OK, -ve on error
265 int cbfs_init_mem(ulong base, ulong size, bool require_hdr,
266 struct cbfs_priv **privp);
268 /***************************************************************************/
269 /* All of the functions below can be used without first initializing CBFS. */
270 /***************************************************************************/
273 * file_cbfs_find_uncached() - Find a file in CBFS given the end of the ROM
275 * Note that @node should be declared by the caller. This design is to avoid
276 * the need for allocation here.
278 * @end_of_rom: Points to the end of the ROM the CBFS should be read from
279 * @name: The name to search for
280 * @node: Returns the contents of the node if found (i.e. copied into *node)
281 * Return: 0 on success, -ENOENT if not found, -EFAULT on bad header
283 int file_cbfs_find_uncached(ulong end_of_rom, const char *name,
284 struct cbfs_cachenode *node);
287 * file_cbfs_find_uncached_base() - Find a file in CBFS given the base address
289 * Note that @node should be declared by the caller. This design is to avoid
290 * the need for allocation here.
292 * @base: Points to the base of the CBFS
293 * @name: The name to search for
294 * @node: Returns the contents of the node if found (i.e. copied into *node)
295 * Return: 0 on success, -ENOENT if not found, -EFAULT on bad header
297 int file_cbfs_find_uncached_base(ulong base, const char *name,
298 struct cbfs_cachenode *node);
301 * file_cbfs_name() - Get the name of a file in CBFS.
303 * @file: The handle to the file.
305 * Return: The name of the file, NULL on error.
307 const char *file_cbfs_name(const struct cbfs_cachenode *file);
310 * file_cbfs_size() - Get the size of a file in CBFS.
312 * @file: The handle to the file.
314 * Return: The size of the file, zero on error.
316 u32 file_cbfs_size(const struct cbfs_cachenode *file);
319 * file_cbfs_type() - Get the type of a file in CBFS.
321 * @file: The handle to the file.
323 * Return: The type of the file, zero on error.
325 u32 file_cbfs_type(const struct cbfs_cachenode *file);
328 * file_cbfs_read() - Read a file from CBFS into RAM
330 * @file: A handle to the file to read.
331 * @buffer: Where to read it into memory.
332 * @maxsize: Maximum number of bytes to read
334 * Return: If positive or zero, the number of characters read. If negative, an
337 long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
338 unsigned long maxsize);
340 #endif /* __CBFS_H */