summaryrefslogtreecommitdiff
path: root/include/cbfs.h
blob: 1b88ec04ae52a2736d5aec42743e5e7a3b1fff01 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 */

#ifndef __CBFS_H
#define __CBFS_H

#include <compiler.h>
#include <linux/compiler.h>

enum cbfs_result {
	CBFS_SUCCESS = 0,
	CBFS_NOT_INITIALIZED,
	CBFS_BAD_HEADER,
	CBFS_BAD_FILE,
	CBFS_FILE_NOT_FOUND
};

enum cbfs_filetype {
	CBFS_TYPE_STAGE = 0x10,
	CBFS_TYPE_PAYLOAD = 0x20,
	CBFS_TYPE_OPTIONROM = 0x30,
	CBFS_TYPE_BOOTSPLASH = 0x40,
	CBFS_TYPE_RAW = 0x50,
	CBFS_TYPE_VSA = 0x51,
	CBFS_TYPE_MBI = 0x52,
	CBFS_TYPE_MICROCODE = 0x53,
	CBFS_COMPONENT_CMOS_DEFAULT = 0xaa,
	CBFS_COMPONENT_CMOS_LAYOUT = 0x01aa
};

struct cbfs_header {
	u32 magic;
	u32 version;
	u32 rom_size;
	u32 boot_block_size;
	u32 align;
	u32 offset;
	u32 pad[2];
} __packed;

struct cbfs_fileheader {
	u8 magic[8];
	u32 len;
	u32 type;
	u32 checksum;
	u32 offset;
} __packed;

struct cbfs_cachenode {
	struct cbfs_cachenode *next;
	u32 type;
	void *data;
	u32 data_length;
	char *name;
	u32 name_length;
	u32 checksum;
} __packed;

extern enum cbfs_result file_cbfs_result;

/**
 * file_cbfs_error() - Return a string describing the most recent error
 * condition.
 *
 * @return A pointer to the constant string.
 */
const char *file_cbfs_error(void);

/**
 * file_cbfs_init() - Initialize the CBFS driver and load metadata into RAM.
 *
 * @end_of_rom: Points to the end of the ROM the CBFS should be read
 *                      from.
 */
void file_cbfs_init(uintptr_t end_of_rom);

/**
 * file_cbfs_get_header() - Get the header structure for the current CBFS.
 *
 * @return A pointer to the constant structure, or NULL if there is none.
 */
const struct cbfs_header *file_cbfs_get_header(void);

/**
 * file_cbfs_get_first() - Get a handle for the first file in CBFS.
 *
 * @return A handle for the first file in CBFS, NULL on error.
 */
const struct cbfs_cachenode *file_cbfs_get_first(void);

/**
 * file_cbfs_get_next() - Get a handle to the file after this one in CBFS.
 *
 * @file:		A pointer to the handle to advance.
 */
void file_cbfs_get_next(const struct cbfs_cachenode **file);

/**
 * file_cbfs_find() - Find a file with a particular name in CBFS.
 *
 * @name:		The name to search for.
 *
 * @return A handle to the file, or NULL on error.
 */
const struct cbfs_cachenode *file_cbfs_find(const char *name);


/***************************************************************************/
/* All of the functions below can be used without first initializing CBFS. */
/***************************************************************************/

/**
 * file_cbfs_find_uncached() - Find a file with a particular name in CBFS
 * without using the heap.
 *
 * @end_of_rom:		Points to the end of the ROM the CBFS should be read
 *                      from.
 * @name:		The name to search for.
 *
 * @return A handle to the file, or NULL on error.
 */
const struct cbfs_cachenode *file_cbfs_find_uncached(uintptr_t end_of_rom,
						     const char *name);

/**
 * file_cbfs_name() - Get the name of a file in CBFS.
 *
 * @file:		The handle to the file.
 *
 * @return The name of the file, NULL on error.
 */
const char *file_cbfs_name(const struct cbfs_cachenode *file);

/**
 * file_cbfs_size() - Get the size of a file in CBFS.
 *
 * @file:		The handle to the file.
 *
 * @return The size of the file, zero on error.
 */
u32 file_cbfs_size(const struct cbfs_cachenode *file);

/**
 * file_cbfs_type() - Get the type of a file in CBFS.
 *
 * @file:		The handle to the file.
 *
 * @return The type of the file, zero on error.
 */
u32 file_cbfs_type(const struct cbfs_cachenode *file);

/**
 * file_cbfs_read() - Read a file from CBFS into RAM
 *
 * @file:		A handle to the file to read.
 * @buffer:		Where to read it into memory.
 * @maxsize:		Maximum number of bytes to read
 *
 * @return If positive or zero, the number of characters read. If negative, an
 *	   error occurred.
 */
long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
		    unsigned long maxsize);

#endif /* __CBFS_H */