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;
73 struct cbfs_cachenode {
74 struct cbfs_cachenode *next;
80 u32 attributes_offset;
84 * file_cbfs_error() - Return a string describing the most recent error
87 * @return A pointer to the constant string.
89 const char *file_cbfs_error(void);
92 * cbfs_get_result() - Get the result of the last CBFS operation
96 enum cbfs_result cbfs_get_result(void);
99 * file_cbfs_init() - Initialize the CBFS driver and load metadata into RAM.
101 * @end_of_rom: Points to the end of the ROM the CBFS should be read from
102 * @return 0 if OK, -ve on error
104 int file_cbfs_init(ulong end_of_rom);
107 * file_cbfs_get_header() - Get the header structure for the current CBFS.
109 * @return A pointer to the constant structure, or NULL if there is none.
111 const struct cbfs_header *file_cbfs_get_header(void);
114 * file_cbfs_get_first() - Get a handle for the first file in CBFS.
116 * @return A handle for the first file in CBFS, NULL on error.
118 const struct cbfs_cachenode *file_cbfs_get_first(void);
121 * file_cbfs_get_next() - Get a handle to the file after this one in CBFS.
123 * @file: A pointer to the handle to advance.
125 void file_cbfs_get_next(const struct cbfs_cachenode **file);
128 * file_cbfs_find() - Find a file with a particular name in CBFS.
130 * @name: The name to search for.
132 * @return A handle to the file, or NULL on error.
134 const struct cbfs_cachenode *file_cbfs_find(const char *name);
139 * cbfs_find_file() - Find a file in a given CBFS
141 * @cbfs: CBFS to look in (use cbfs_init_mem() to set it up)
142 * @name: Filename to look for
143 * @return pointer to CBFS node if found, else NULL
145 const struct cbfs_cachenode *cbfs_find_file(struct cbfs_priv *cbfs,
149 * cbfs_init_mem() - Set up a new CBFS
151 * @base: Base address of CBFS
152 * @cbfsp: Returns a pointer to CBFS on success
153 * @return 0 if OK, -ve on error
155 int cbfs_init_mem(ulong base, struct cbfs_priv **privp);
158 /***************************************************************************/
159 /* All of the functions below can be used without first initializing CBFS. */
160 /***************************************************************************/
163 * file_cbfs_find_uncached() - Find a file in CBFS given the end of the ROM
165 * Note that @node should be declared by the caller. This design is to avoid
166 * the need for allocation here.
168 * @end_of_rom: Points to the end of the ROM the CBFS should be read from
169 * @name: The name to search for
170 * @node: Returns the contents of the node if found (i.e. copied into *node)
171 * @return 0 on success, -ENOENT if not found, -EFAULT on bad header
173 int file_cbfs_find_uncached(ulong end_of_rom, const char *name,
174 struct cbfs_cachenode *node);
177 * file_cbfs_find_uncached_base() - Find a file in CBFS given the base address
179 * Note that @node should be declared by the caller. This design is to avoid
180 * the need for allocation here.
182 * @base: Points to the base of the CBFS
183 * @name: The name to search for
184 * @node: Returns the contents of the node if found (i.e. copied into *node)
185 * @return 0 on success, -ENOENT if not found, -EFAULT on bad header
187 int file_cbfs_find_uncached_base(ulong base, const char *name,
188 struct cbfs_cachenode *node);
191 * file_cbfs_name() - Get the name of a file in CBFS.
193 * @file: The handle to the file.
195 * @return The name of the file, NULL on error.
197 const char *file_cbfs_name(const struct cbfs_cachenode *file);
200 * file_cbfs_size() - Get the size of a file in CBFS.
202 * @file: The handle to the file.
204 * @return The size of the file, zero on error.
206 u32 file_cbfs_size(const struct cbfs_cachenode *file);
209 * file_cbfs_type() - Get the type of a file in CBFS.
211 * @file: The handle to the file.
213 * @return The type of the file, zero on error.
215 u32 file_cbfs_type(const struct cbfs_cachenode *file);
218 * file_cbfs_read() - Read a file from CBFS into RAM
220 * @file: A handle to the file to read.
221 * @buffer: Where to read it into memory.
222 * @maxsize: Maximum number of bytes to read
224 * @return If positive or zero, the number of characters read. If negative, an
227 long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
228 unsigned long maxsize);
230 #endif /* __CBFS_H */