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annotate packages/redboot/current/src/fs/disk.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 8147f1c99f15
children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // disk.c
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4 //
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5 // RedBoot disk support
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6 //
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7 //==========================================================================
208
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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
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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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: 2001-07-14
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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 #include <redboot.h>
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56 #include <fs/disk.h>
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57
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58 #ifdef CYGSEM_REDBOOT_DISK_EXT2FS
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59 #include <fs/e2fs.h>
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60 #endif
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61 #ifdef CYGSEM_REDBOOT_DISK_ISO9660
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62 #include <fs/iso9660fs.h>
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63 #endif
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64
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65 static void do_disks(int argc, char *argv[]);
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66
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67 RedBoot_cmd("disks",
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68 "Display disks/partitions.",
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69 "",
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70 do_disks
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71 );
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72
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73 static disk_t disk_table[CYGNUM_REDBOOT_MAX_DISKS];
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74 static int disk_count = 0;
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75
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76 static int
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77 find_dos_partitions(disk_t *d, cyg_uint8 *mbr)
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78 {
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79 cyg_uint32 s, n, tmp;
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80 struct mbr_partition *p;
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81 int i, found = 0;
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82
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83 p = (struct mbr_partition *)(mbr + MBR_PTABLE_OFFSET);
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84
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85 // Look for primary partitions
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86 for (i = 0; i < 4 && i < CYGNUM_REDBOOT_MAX_PARTITIONS; i++) {
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87
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88 // Have to use memcpy because of alignment
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89 memcpy(&tmp, p->start_sect, 4);
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90 s = SWAB_LE32(tmp);
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91 memcpy(&tmp, p->nr_sects, 4);
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92 n = SWAB_LE32(tmp);
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93
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94 if (s && n) {
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95 ++found;
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96 d->partitions[i].disk = d;
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97 d->partitions[i].start_sector = s;
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98 d->partitions[i].nr_sectors = n;
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99 d->partitions[i].systype = p->sys_ind;
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100 d->partitions[i].bootflag = p->boot_ind;
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101 }
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102 p++;
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103 }
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104
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105 #if CYGNUM_REDBOOT_MAX_PARTITIONS > 4
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106 {
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107 cyg_uint32 buf[SECTOR_SIZE/sizeof(cyg_uint32)], xoffset;
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108 cyg_uint16 magic;
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109 int nextp;
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110
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111 // Go back through and find extended partitions
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112 for (i = 0, nextp = 4; i < 4 && nextp < CYGNUM_REDBOOT_MAX_PARTITIONS; i++) {
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113 if (d->partitions[i].systype == SYSTYPE_EXTENDED) {
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114 // sector offsets in partition tables are relative to start
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115 // of extended partition.
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116 xoffset = d->partitions[i].start_sector;
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117 for ( ; nextp < CYGNUM_REDBOOT_MAX_PARTITIONS; ++nextp) {
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118
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119 // read partition boot record (same format as mbr except
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120 // there should only be 2 entries max: a normal partition
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121 // and another extended partition
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122 if (DISK_READ(d, xoffset, buf, 1) <= 0)
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123 break;
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124
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125 magic = *(cyg_uint16 *)((char *)buf + MBR_MAGIC_OFFSET);
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126 if (SWAB_LE16(magic) != MBR_MAGIC)
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127 break;
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128
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129 p = (struct mbr_partition *)((char *)buf + MBR_PTABLE_OFFSET);
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130
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131 // Have to use memcpy because of alignment
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132 memcpy(&tmp, p->start_sect, 4);
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133 s = SWAB_LE32(tmp);
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134 memcpy(&tmp, p->nr_sects, 4);
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135 n = SWAB_LE32(tmp);
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136
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137 if (s && n) {
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138 ++found;
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139 d->partitions[nextp].disk = d;
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140 d->partitions[nextp].start_sector = s + xoffset;
174
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141 d->partitions[nextp].nr_sectors = n;
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142 d->partitions[nextp].systype = p->sys_ind;
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143 d->partitions[nextp].bootflag = p->boot_ind;
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144 }
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145 ++p;
176
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146
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147 memcpy(&tmp, p->start_sect, 4);
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148 s = SWAB_LE32(tmp);
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149 memcpy(&tmp, p->nr_sects, 4);
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150 n = SWAB_LE32(tmp);
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151
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152 // more extended partitions?
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153 if (p->sys_ind != SYSTYPE_EXTENDED || !s || !n)
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154 break;
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155
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156 xoffset += s;
174
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157 }
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158 }
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159 }
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160 }
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161 #endif
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162 return found;
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163 }
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164
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165
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166 // Find partitions on given disk.
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167 // Return number of partitions found
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168 static int
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169 find_partitions(disk_t *d)
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170 {
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171 cyg_uint32 buf[SECTOR_SIZE/sizeof(cyg_uint32)];
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172 cyg_uint16 magic;
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173 partition_t *p;
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174 int i, found = 0;
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175
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176
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177 if (d->kind == DISK_IDE_CDROM) {
186
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178 #ifdef CYGSEM_REDBOOT_DISK_ISO9660
174
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179 // no partition table, so fake it
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180 p = d->partitions;
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181 p->disk = d;
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182 p->start_sector = 0;
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183 p->nr_sectors = d->nr_sectors;
177
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184 p->funs = &redboot_iso9660fs_funs;
186
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185 return 1;
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186 #else
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187 return 0;
177
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188 #endif
174
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189 }
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190
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191 // read Master Boot Record
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192 if (DISK_READ(d, 0, buf, 1) <= 0)
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193 return 0;
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194
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195 // Check for DOS MBR
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196 magic = *(cyg_uint16 *)((char *)buf + MBR_MAGIC_OFFSET);
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197 if (SWAB_LE16(magic) == MBR_MAGIC) {
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198 found = find_dos_partitions(d, (cyg_uint8 *)buf);
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199 } else {
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200 // Might want to handle other MBR types, here...
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201 }
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202
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203 // Now go through all partitions and install the correct
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204 // funcs for supported filesystems.
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205 for (i = 0, p = d->partitions; i < CYGNUM_REDBOOT_MAX_PARTITIONS; i++, p++) {
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206 switch (p->systype) {
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207 #ifdef CYGSEM_REDBOOT_DISK_EXT2FS
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208 case SYSTYPE_LINUX:
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209 p->funs = &redboot_e2fs_funs;
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210 break;
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211 #endif
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212 #ifdef CYGSEM_REDBOOT_DISK_FAT16
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213 case SYSTYPE_FAT16:
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214 p->funs = &redboot_fat16_funs;
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215 break;
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216 #endif
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217 #ifdef CYGSEM_REDBOOT_DISK_FAT32
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218 case SYSTYPE_FAT32:
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219 p->funs = &redboot_fat32_funs;
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220 break;
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221 #endif
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222 default:
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223 break; // ignore unsupported filesystems
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224 }
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225 }
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226
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227 return found;
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228 }
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229
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230 // Add a disk to the disk table.
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231 // Return zero if no more room in table.
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232 externC int
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233 disk_register(disk_t *d)
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234 {
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235 int i;
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236
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237 // make sure we have room for it
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238 if (disk_count >= CYGNUM_REDBOOT_MAX_DISKS)
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239 return 0;
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240
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241 // Set the index
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242 d->index = 0;
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243 for (i = 0; i < disk_count; i++)
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244 if (disk_table[i].kind == d->kind)
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245 d->index++;
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246
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247 // put it in the table
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248 disk_table[disk_count] = *d;
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249
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250 // fill in partition info
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251 find_partitions(&disk_table[disk_count++]);
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252
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253 return 1;
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254 }
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255
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256 // Convert a filename in the form <partition_name>:<filename> into
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257 // a partition and path.
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258 //
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259 static int
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260 disk_parse_filename(const char *name, partition_t **part, const char **path)
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261 {
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262 int i, kind, index, pindex;
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263
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264 kind = index = pindex = 0;
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265
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266 if (name[0] == 'h' && name[1] == 'd') {
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267 // IDE hard drives
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268 kind = DISK_IDE_HD;
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269 if (name[2] < 'a' || name[2] > 'z')
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270 return 0;
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271 index = name[2] - 'a';
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272 if (name[3] < '1' || name[3] >= ('1' + CYGNUM_REDBOOT_MAX_PARTITIONS))
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273 return 0;
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274 pindex = name[3] - '1';
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275 if (name[4] != ':')
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276 return 0;
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277 *path = &name[5];
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278 }
200
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279 #ifdef CYGSEM_REDBOOT_DISK_ISO9660
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280 else if (name[0] == 'c' && name[1] == 'd') {
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281 // CD drives
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282 kind = DISK_IDE_CDROM;
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283 if (name[2] < '0' || name[2] > '9')
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284 return 0;
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285 index = name[2] - '0';
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286 if (name[3] != ':')
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287 return 0;
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288 *path = &name[4];
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289 }
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290 #endif
174
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291
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292 if (kind) {
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293 for (i = 0; i < CYGNUM_REDBOOT_MAX_DISKS; i++) {
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294 if (disk_table[i].kind == kind && disk_table[i].index == index) {
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295 *part = &disk_table[i].partitions[pindex];
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296 return 1;
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297 }
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298 }
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299 }
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300 return 0;
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301 }
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302
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303 static const struct {
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304 int kind;
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305 const char *str;
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306 } systype_names[] = {
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307 { SYSTYPE_FAT12, "FAT12" },
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308 { SYSTYPE_FAT16_32M, "FAT16 <32M" },
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309 { SYSTYPE_FAT16, "FAT16" },
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310 { SYSTYPE_EXTENDED, "Extended" },
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311 { SYSTYPE_LINUX_SWAP, "Linux Swap" },
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312 { SYSTYPE_LINUX, "Linux" }
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313 };
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314
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315 static const char *
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316 systype_name(int systype)
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317 {
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318 int i;
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319
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320 for (i = 0; i < sizeof(systype_names)/sizeof(systype_names[0]); i++)
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321 if (systype_names[i].kind == systype)
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322 return systype_names[i].str;
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323 return "Unknown";
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324 }
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325
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326 // List disk partitions
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327 static void
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328 do_disks(int argc, char *argv[])
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329 {
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330 int i, j;
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331 disk_t *d;
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332 partition_t *p;
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333 char name[16];
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334
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335 for (i = 0, d = disk_table; i < disk_count; i++, d++) {
182
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336 switch (d->kind) {
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337 case DISK_IDE_HD:
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338 for (j = 0, p = d->partitions;
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339 j < CYGNUM_REDBOOT_MAX_PARTITIONS;
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340 j++, p++) {
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341 if (p->systype) {
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342 diag_sprintf(name, "hd%c%d", 'a' + d->index, j+1);
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343 diag_printf("%-8s %s\n", name, systype_name(p->systype));
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344 }
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345 }
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346 break;
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347 case DISK_IDE_CDROM:
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348 diag_sprintf(name, "cd%d", d->index);
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349 diag_printf("%-8s ISO9660\n", name);
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350 break;
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351 }
174
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352 }
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353 }
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354
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355 static void *fileptr;
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356 static partition_t *file_part;
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357
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358 externC int
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359 disk_stream_open(char *filename, int *err)
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360 {
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361 const char *filepath;
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362
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363 // The filename is in <disk>:<path> format.
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364 // Convert to a partition and path.
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365 if (!disk_parse_filename(filename, &file_part, &filepath)) {
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366 *err = diskerr_badname;
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367 return -1;
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368 }
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369
200
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370 if (file_part->disk->kind != DISK_IDE_CDROM && file_part->systype == 0) {
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371 *err = diskerr_partition;
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372 return -1;
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373 }
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374
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375 if (file_part->funs == (fs_funs_t *)0) {
174
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376 *err = diskerr_partition;
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377 return -1;
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378 }
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379
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380 fileptr = (file_part->funs->open)(file_part, filepath);
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381 if (fileptr == NULL) {
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382 *err = diskerr_open;
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383 return -1;
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384 }
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385 return 0;
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386 }
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387
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388 externC int
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389 disk_stream_read(char *buf, int size, int *err)
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390 {
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391 int nread;
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392
208
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393 if ((nread = (file_part->funs->read)(fileptr, buf, size)) < 0) {
174
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394 *err = diskerr_read;
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395 return -1;
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396 }
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397 return nread;
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398 }
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399
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400 externC void
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401 disk_stream_close(int *err)
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402 {
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403 fileptr = NULL;
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404 }
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405
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406 externC char *
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407 disk_error(int err)
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408 {
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409 switch (err) {
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410 case diskerr_badname:
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411 return "Bad filename";
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412 break;
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413 case diskerr_partition:
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414 return "Unsupported filesystem";
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415 break;
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416 case diskerr_open:
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417 return "Can't open file";
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418 break;
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419 case diskerr_read:
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420 return "Can't read file";
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421 break;
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422 default:
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423 return "Unknown error";
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424 break;
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425 }
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426 }
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427