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annotate packages/redboot/current/include/fs/disk.h @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children bc44a13e8bd4
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1 //==========================================================================
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2 //
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3 // disk.h
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4 //
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5 // Stand-alone disk support for RedBoot
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6 //
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7 //==========================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
174
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): msalter
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44 // Contributors: msalter
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45 // Date: 2001-07-02
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46 // Purpose:
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47 // Description:
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48 //
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49 // This code is part of RedBoot (tm).
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 #ifndef CYGONCE_REDBOOT_DISK_H
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56 #define CYGONCE_REDBOOT_DISK_H
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57
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58 #define SECTOR_SIZE 512
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59
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60 // Convenience macros to access disk/filesystem info which may
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61 // be stored in a fixed endian format.
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62
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63 #define __SWAB16(x) \
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64 ((((x) & 0xFF) << 8) | (((x) >> 8) & 0xFF))
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65
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66 #define __SWAB32(x) \
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67 ((((x) & 0xff) << 24) | \
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68 (((x) & 0xff00) << 8) | \
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69 (((x) >> 8) & 0xff) | \
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70 (((x) >> 24) & 0xff))
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71
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72 #if (CYG_BYTEORDER == CYG_MSBFIRST)
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73 #define SWAB_LE16(x) __SWAB16(x)
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74 #define SWAB_LE32(x) __SWAB32(x)
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75 #define SWAB_BE16(x) (x)
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76 #define SWAB_BE32(x) (x)
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77 #else
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78 #define SWAB_LE16(x) (x)
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79 #define SWAB_LE32(x) (x)
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80 #define SWAB_BE16(x) __SWAB16(x)
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81 #define SWAB_BE32(x) __SWAB32(x)
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82 #endif
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83
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84 struct partition;
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85
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86 // filesystem interface
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87 typedef struct fs_funs {
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88 // Load a file into memory.
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89 void * (*open)(struct partition *p, const char *path);
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90 int (*read)(void *fp, char *buf, cyg_uint32 nbytes);
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91 } fs_funs_t;
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92
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93 struct disk;
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94
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95 typedef struct partition {
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96 struct disk *disk;
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97 fs_funs_t *funs;
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98 cyg_uint32 start_sector; // first sector in partition
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99 cyg_uint32 nr_sectors; // number of sectors in partition
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100 cyg_uint8 systype; // FAT12, FAT16, Linux, etc.
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101 cyg_uint8 bootflag; // not really used...
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102 } partition_t;
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103
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104 // System types
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105 #define SYSTYPE_FAT12 0x01
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106 #define SYSTYPE_FAT16_32M 0x04
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107 #define SYSTYPE_EXTENDED 0x05
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108 #define SYSTYPE_FAT16 0x06
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109 #define SYSTYPE_LINUX_SWAP 0x82
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110 #define SYSTYPE_LINUX 0x83
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111
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112 typedef struct disk_funs {
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113 int (*read)(struct disk *d,
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114 cyg_uint32 start_sector,
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115 cyg_uint32 *buf,
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116 cyg_uint8 nr_sectors);
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117 } disk_funs_t;
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118
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119
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120 typedef struct disk {
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121 disk_funs_t *funs; // Disk driver functions
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122 void *private; // Whatever is needed by disk functions
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123 cyg_uint32 nr_sectors; // Total disk size in sectors
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124 short kind; // IDE_HD, IDE_CDROM, SCSI_HD, etc
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125 short index; // index within specific kind
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126 partition_t partitions[CYGNUM_REDBOOT_MAX_PARTITIONS];
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127 } disk_t;
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128
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129 #define DISK_READ(d,s,p,n) ((d)->funs->read)((d),(s),(p),(n))
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130 #define PARTITION_READ(part,s,p,n) \
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131 DISK_READ((part)->disk, (s) + (part)->start_sector, (p), (n))
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132
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133 // Kinds of disks
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134 #define DISK_IDE_HD 1
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135 #define DISK_IDE_CDROM 2
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136 #define DISK_FLOPPY 3
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137
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138 // DOS partition table as laid out in the MBR
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139 //
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140 struct mbr_partition {
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141 cyg_uint8 boot_ind; // 0x80 == active
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142 cyg_uint8 head;
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143 cyg_uint8 sector;
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144 cyg_uint8 cyl;
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145 cyg_uint8 sys_ind; // partition type
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146 cyg_uint8 end_head;
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147 cyg_uint8 end_sector;
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148 cyg_uint8 end_cyl;
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149 cyg_uint8 start_sect[4]; // starting sector counting from 0
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150 cyg_uint8 nr_sects[4]; // number of sectors in partition
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151 };
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152
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153 #define MBR_PTABLE_OFFSET 0x1be
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154 #define MBR_MAGIC_OFFSET 0x1fe
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155 #define MBR_MAGIC 0xaa55
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156
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157 // Add a disk to the disk table.
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158 // Return zero if no more room in table.
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159 //
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160 externC int disk_register(disk_t *disk);
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161
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162
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163 #define diskerr_badname -1
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164 #define diskerr_partition -2
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165 #define diskerr_open -3
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166 #define diskerr_read -4
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167
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168 externC int disk_stream_open(char *filename, int *err);
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169 externC void disk_stream_close(int *err);
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170 externC int disk_stream_read(char *buf, int size, int *err);
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171 externC char *disk_error(int err);
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172
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173 #endif // CYGONCE_REDBOOT_DISK_H