include/cbfs.h

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  17  * MA 02111-1307 USA
  18  */
  19
  20 #ifndef __CBFS_H
  21 #define __CBFS_H
  22
  23 #include <compiler.h>
  24 #include <linux/compiler.h>
  25
  26 enum cbfs_result {
  27         CBFS_SUCCESS = 0,
  28         CBFS_NOT_INITIALIZED,
  29         CBFS_BAD_HEADER,
  30         CBFS_BAD_FILE,
  31         CBFS_FILE_NOT_FOUND
  32 };
  33
  34 enum cbfs_filetype {
  35         CBFS_TYPE_STAGE = 0x10,
  36         CBFS_TYPE_PAYLOAD = 0x20,
  37         CBFS_TYPE_OPTIONROM = 0x30,
  38         CBFS_TYPE_BOOTSPLASH = 0x40,
  39         CBFS_TYPE_RAW = 0x50,
  40         CBFS_TYPE_VSA = 0x51,
  41         CBFS_TYPE_MBI = 0x52,
  42         CBFS_TYPE_MICROCODE = 0x53,
  43         CBFS_COMPONENT_CMOS_DEFAULT = 0xaa,
  44         CBFS_COMPONENT_CMOS_LAYOUT = 0x01aa
  45 };
  46
  47 struct cbfs_header {
  48         u32 magic;
  49         u32 version;
  50         u32 rom_size;
  51         u32 boot_block_size;
  52         u32 align;
  53         u32 offset;
  54         u32 pad[2];
  55 } __packed;
  56
  57 struct cbfs_fileheader {
  58         u8 magic[8];
  59         u32 len;
  60         u32 type;
  61         u32 checksum;
  62         u32 offset;
  63 } __packed;
  64
  65 struct cbfs_cachenode {
  66         struct cbfs_cachenode *next;
  67         u32 type;
  68         void *data;
  69         u32 data_length;
  70         char *name;
  71         u32 name_length;
  72         u32 checksum;
  73 } __packed;
  74
  75 extern enum cbfs_result file_cbfs_result;
  76
  77 /**
  78  * file_cbfs_error() - Return a string describing the most recent error
  79  * condition.
  80  *
  81  * @return A pointer to the constant string.
  82  */
  83 const char *file_cbfs_error(void);
  84
  85 /**
  86  * file_cbfs_init() - Initialize the CBFS driver and load metadata into RAM.
  87  *
  88  * @end_of_rom: Points to the end of the ROM the CBFS should be read
  89  *                      from.
  90  */
  91 void file_cbfs_init(uintptr_t end_of_rom);
  92
  93 /**
  94  * file_cbfs_get_header() - Get the header structure for the current CBFS.
  95  *
  96  * @return A pointer to the constant structure, or NULL if there is none.
  97  */
  98 const struct cbfs_header *file_cbfs_get_header(void);
  99
 100 /**
 101  * file_cbfs_get_first() - Get a handle for the first file in CBFS.
 102  *
 103  * @return A handle for the first file in CBFS, NULL on error.
 104  */
 105 const struct cbfs_cachenode *file_cbfs_get_first(void);
 106
 107 /**
 108  * file_cbfs_get_next() - Get a handle to the file after this one in CBFS.
 109  *
 110  * @file:               A pointer to the handle to advance.
 111  */
 112 void file_cbfs_get_next(const struct cbfs_cachenode **file);
 113
 114 /**
 115  * file_cbfs_find() - Find a file with a particular name in CBFS.
 116  *
 117  * @name:               The name to search for.
 118  *
 119  * @return A handle to the file, or NULL on error.
 120  */
 121 const struct cbfs_cachenode *file_cbfs_find(const char *name);
 122
 123
 124 /***************************************************************************/
 125 /* All of the functions below can be used without first initializing CBFS. */
 126 /***************************************************************************/
 127
 128 /**
 129  * file_cbfs_find_uncached() - Find a file with a particular name in CBFS
 130  * without using the heap.
 131  *
 132  * @end_of_rom:         Points to the end of the ROM the CBFS should be read
 133  *                      from.
 134  * @name:               The name to search for.
 135  *
 136  * @return A handle to the file, or NULL on error.
 137  */
 138 const struct cbfs_cachenode *file_cbfs_find_uncached(uintptr_t end_of_rom,
 139                                                      const char *name);
 140
 141 /**
 142  * file_cbfs_name() - Get the name of a file in CBFS.
 143  *
 144  * @file:               The handle to the file.
 145  *
 146  * @return The name of the file, NULL on error.
 147  */
 148 const char *file_cbfs_name(const struct cbfs_cachenode *file);
 149
 150 /**
 151  * file_cbfs_size() - Get the size of a file in CBFS.
 152  *
 153  * @file:               The handle to the file.
 154  *
 155  * @return The size of the file, zero on error.
 156  */
 157 u32 file_cbfs_size(const struct cbfs_cachenode *file);
 158
 159 /**
 160  * file_cbfs_type() - Get the type of a file in CBFS.
 161  *
 162  * @file:               The handle to the file.
 163  *
 164  * @return The type of the file, zero on error.
 165  */
 166 u32 file_cbfs_type(const struct cbfs_cachenode *file);
 167
 168 /**
 169  * file_cbfs_read() - Read a file from CBFS into RAM
 170  *
 171  * @file:               A handle to the file to read.
 172  * @buffer:             Where to read it into memory.
 173  * @maxsize:            Maximum number of bytes to read
 174  *
 175  * @return If positive or zero, the number of characters read. If negative, an
 176  *         error occurred.
 177  */
 178 long file_cbfs_read(const struct cbfs_cachenode *file, void *buffer,
 179                     unsigned long maxsize);
 180
 181 #endif /* __CBFS_H */