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 {
72 struct cbfs_cachenode {
73 struct cbfs_cachenode *next;
82 extern enum cbfs_result file_cbfs_result;
85 * file_cbfs_error() - Return a string describing the most recent error
88 * @return A pointer to the constant string.
90 const char *file_cbfs_error(void);
93 * file_cbfs_init() - Initialize the CBFS driver and load metadata into RAM.
95 * @end_of_rom: Points to the end of the ROM the CBFS should be read
98 void file_cbfs_init(uintptr_t end_of_rom);
101 * file_cbfs_get_header() - Get the header structure for the current CBFS.
103 * @return A pointer to the constant structure, or NULL if there is none.
105 const struct cbfs_header *file_cbfs_get_header(void);
108 * file_cbfs_get_first() - Get a handle for the first file in CBFS.
110 * @return A handle for the first file in CBFS, NULL on error.
112 const struct cbfs_cachenode *file_cbfs_get_first(void);
115 * file_cbfs_get_next() - Get a handle to the file after this one in CBFS.
117 * @file: A pointer to the handle to advance.
119 void file_cbfs_get_next(const struct cbfs_cachenode **file);
122 * file_cbfs_find() - Find a file with a particular name in CBFS.
124 * @name: The name to search for.
126 * @return A handle to the file, or NULL on error.
128 const struct cbfs_cachenode *file_cbfs_find(const char *name);
131 /***************************************************************************/
132 /* All of the functions below can be used without first initializing CBFS. */
133 /***************************************************************************/
136 * file_cbfs_find_uncached() - Find a file with a particular name in CBFS
137 * without using the heap.
139 * @end_of_rom: Points to the end of the ROM the CBFS should be read
141 * @name: The name to search for.
143 * @return A handle to the file, or NULL on error.
145 const struct cbfs_cachenode *file_cbfs_find_uncached(uintptr_t end_of_rom,
149 * file_cbfs_name() - Get the name of a file in CBFS.
151 * @file: The handle to the file.
153 * @return The name of the file, NULL on error.
155 const char *file_cbfs_name(const struct cbfs_cachenode *file);
158 * file_cbfs_size() - Get the size of a file in CBFS.
160 * @file: The handle to the file.
162 * @return The size of the file, zero on error.
164 u32 file_cbfs_size(const struct cbfs_cachenode *file);
167 * file_cbfs_type() - Get the type of a file in CBFS.
169 * @file: The handle to the file.
171 * @return The type of the file, zero on error.
173 u32 file_cbfs_type(const struct cbfs_cachenode *file);
176 * file_cbfs_read() - Read a file from CBFS into RAM
178 * @file: A handle to the file to read.
179 * @buffer: Where to read it into memory.
180 * @maxsize: Maximum number of bytes to read
182 * @return If positive or zero, the number of characters read. If negative, an
185 long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
186 unsigned long maxsize);
188 #endif /* __CBFS_H */