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annotate packages/redboot/current/src/fs/disk.c @ 177:4c750ce71ae3

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Merge from eCos master repository on 2001-08-10-19:22:57-BST
author jlarmour
date Fri, 10 Aug 2001 19:27:55 +0000
parents 3902ef905c9c
children f62680ef1804
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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 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): msalter
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35 // Contributors: msalter
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36 // Date: 2001-07-14
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37 // Purpose:
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38 // Description:
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39 //
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40 // This code is part of RedBoot (tm).
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //==========================================================================
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45
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46 #include <redboot.h>
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47 #include <fs/disk.h>
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48
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49 #ifdef CYGSEM_REDBOOT_DISK_EXT2FS
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50 #include <fs/e2fs.h>
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51 #endif
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52 #ifdef CYGSEM_REDBOOT_DISK_ISO9660
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53 #include <fs/iso9660fs.h>
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54 #endif
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55
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56 static void do_disks(int argc, char *argv[]);
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57
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58 RedBoot_cmd("disks",
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59 "Display disks/partitions.",
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60 "",
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61 do_disks
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62 );
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63
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64 static disk_t disk_table[CYGNUM_REDBOOT_MAX_DISKS];
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65 static int disk_count = 0;
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66
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67 static int
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68 find_dos_partitions(disk_t *d, cyg_uint8 *mbr)
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69 {
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70 cyg_uint32 s, n, tmp;
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71 struct mbr_partition *p;
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72 int i, found = 0;
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73
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74 p = (struct mbr_partition *)(mbr + MBR_PTABLE_OFFSET);
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75
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76 // Look for primary partitions
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77 for (i = 0; i < 4 && i < CYGNUM_REDBOOT_MAX_PARTITIONS; i++) {
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78
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79 // Have to use memcpy because of alignment
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80 memcpy(&tmp, p->start_sect, 4);
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81 s = SWAB_LE32(tmp);
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82 memcpy(&tmp, p->nr_sects, 4);
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83 n = SWAB_LE32(tmp);
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84
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85 if (s && n) {
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86 ++found;
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87 d->partitions[i].disk = d;
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88 d->partitions[i].start_sector = s;
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89 d->partitions[i].nr_sectors = n;
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90 d->partitions[i].systype = p->sys_ind;
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91 d->partitions[i].bootflag = p->boot_ind;
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92 }
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93 p++;
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94 }
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95
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96 #if CYGNUM_REDBOOT_MAX_PARTITIONS > 4
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97 {
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98 cyg_uint32 buf[SECTOR_SIZE/sizeof(cyg_uint32)], xoffset;
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99 cyg_uint16 magic;
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100 int nextp;
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101
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102 // Go back through and find extended partitions
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103 for (i = 0, nextp = 4; i < 4 && nextp < CYGNUM_REDBOOT_MAX_PARTITIONS; i++) {
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104 if (d->partitions[i].systype == SYSTYPE_EXTENDED) {
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105 // sector offsets in partition tables are relative to start
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106 // of extended partition.
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107 xoffset = d->partitions[i].start_sector;
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108 for ( ; nextp < CYGNUM_REDBOOT_MAX_PARTITIONS; ++nextp) {
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109
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110 // read partition boot record (same format as mbr except
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111 // there should only be 2 entries max: a normal partition
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112 // and another extended partition
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113 if (DISK_READ(d, xoffset, buf, 1) <= 0)
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114 break;
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115
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116 magic = *(cyg_uint16 *)((char *)buf + MBR_MAGIC_OFFSET);
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117 if (SWAB_LE16(magic) != MBR_MAGIC)
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118 break;
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119
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120 p = (struct mbr_partition *)((char *)buf + MBR_PTABLE_OFFSET);
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121
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122 // Have to use memcpy because of alignment
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123 memcpy(&tmp, p->start_sect, 4);
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124 s = SWAB_LE32(tmp);
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125 memcpy(&tmp, p->nr_sects, 4);
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126 n = SWAB_LE32(tmp);
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127
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128 if (s && n) {
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129 ++found;
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130 d->partitions[nextp].disk = d;
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131 d->partitions[nextp].start_sector = s + xoffset;
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132 d->partitions[nextp].nr_sectors = n;
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133 d->partitions[nextp].systype = p->sys_ind;
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134 d->partitions[nextp].bootflag = p->boot_ind;
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135 }
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136 ++p;
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137
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138 memcpy(&tmp, p->start_sect, 4);
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139 s = SWAB_LE32(tmp);
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140 memcpy(&tmp, p->nr_sects, 4);
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141 n = SWAB_LE32(tmp);
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142
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143 // more extended partitions?
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144 if (p->sys_ind != SYSTYPE_EXTENDED || !s || !n)
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145 break;
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146
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147 xoffset += s;
174
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148 }
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149 }
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150 }
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151 }
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152 #endif
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153 return found;
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154 }
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155
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156
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157 // Find partitions on given disk.
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158 // Return number of partitions found
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159 static int
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160 find_partitions(disk_t *d)
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161 {
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162 cyg_uint32 buf[SECTOR_SIZE/sizeof(cyg_uint32)];
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163 cyg_uint16 magic;
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164 partition_t *p;
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165 int i, found = 0;
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166
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167
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168 if (d->kind == DISK_IDE_CDROM) {
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169 // no partition table, so fake it
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170 p = d->partitions;
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171 p->disk = d;
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172 p->start_sector = 0;
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173 p->nr_sectors = d->nr_sectors;
177
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174 #ifdef CYGSEM_REDBOOT_DISK_ISO9660
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175 p->funs = &redboot_iso9660fs_funs;
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176 #endif
174
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177 return 1;
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178 }
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179
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180 // read Master Boot Record
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181 if (DISK_READ(d, 0, buf, 1) <= 0)
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182 return 0;
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183
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184 // Check for DOS MBR
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185 magic = *(cyg_uint16 *)((char *)buf + MBR_MAGIC_OFFSET);
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186 if (SWAB_LE16(magic) == MBR_MAGIC) {
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187 found = find_dos_partitions(d, (cyg_uint8 *)buf);
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188 } else {
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189 // Might want to handle other MBR types, here...
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190 }
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191
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192 // Now go through all partitions and install the correct
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193 // funcs for supported filesystems.
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194 for (i = 0, p = d->partitions; i < CYGNUM_REDBOOT_MAX_PARTITIONS; i++, p++) {
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195 switch (p->systype) {
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196 #ifdef CYGSEM_REDBOOT_DISK_EXT2FS
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197 case SYSTYPE_LINUX:
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198 p->funs = &redboot_e2fs_funs;
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199 break;
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200 #endif
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201 #ifdef CYGSEM_REDBOOT_DISK_FAT16
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202 case SYSTYPE_FAT16:
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203 p->funs = &redboot_fat16_funs;
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204 break;
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205 #endif
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206 #ifdef CYGSEM_REDBOOT_DISK_FAT32
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207 case SYSTYPE_FAT32:
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208 p->funs = &redboot_fat32_funs;
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209 break;
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210 #endif
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211 default:
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212 break; // ignore unsupported filesystems
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213 }
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214 }
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215
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216 return found;
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217 }
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218
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219 // Add a disk to the disk table.
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220 // Return zero if no more room in table.
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221 externC int
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222 disk_register(disk_t *d)
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223 {
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224 int i;
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225
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226 // make sure we have room for it
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227 if (disk_count >= CYGNUM_REDBOOT_MAX_DISKS)
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228 return 0;
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229
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230 // Set the index
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231 d->index = 0;
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232 for (i = 0; i < disk_count; i++)
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233 if (disk_table[i].kind == d->kind)
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234 d->index++;
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235
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236 // put it in the table
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237 disk_table[disk_count] = *d;
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238
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239 // fill in partition info
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240 find_partitions(&disk_table[disk_count++]);
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241
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242 return 1;
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243 }
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244
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245 // Convert a filename in the form <partition_name>:<filename> into
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246 // a partition and path.
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247 //
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248 static int
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249 disk_parse_filename(const char *name, partition_t **part, const char **path)
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250 {
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251 int i, kind, index, pindex;
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252
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253 kind = index = pindex = 0;
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254
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255 if (name[0] == 'h' && name[1] == 'd') {
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256 // IDE hard drives
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257 kind = DISK_IDE_HD;
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258 if (name[2] < 'a' || name[2] > 'z')
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259 return 0;
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260 index = name[2] - 'a';
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261 if (name[3] < '1' || name[3] >= ('1' + CYGNUM_REDBOOT_MAX_PARTITIONS))
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262 return 0;
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263 pindex = name[3] - '1';
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264 if (name[4] != ':')
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265 return 0;
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266 *path = &name[5];
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267 }
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268
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269 if (kind) {
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270 for (i = 0; i < CYGNUM_REDBOOT_MAX_DISKS; i++) {
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271 if (disk_table[i].kind == kind && disk_table[i].index == index) {
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272 *part = &disk_table[i].partitions[pindex];
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273 return 1;
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274 }
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275 }
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276 }
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277 return 0;
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278 }
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279
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280 static const struct {
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281 int kind;
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282 const char *str;
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283 } systype_names[] = {
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284 { SYSTYPE_FAT12, "FAT12" },
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285 { SYSTYPE_FAT16_32M, "FAT16 <32M" },
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286 { SYSTYPE_FAT16, "FAT16" },
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287 { SYSTYPE_EXTENDED, "Extended" },
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288 { SYSTYPE_LINUX_SWAP, "Linux Swap" },
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289 { SYSTYPE_LINUX, "Linux" }
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290 };
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291
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292 static const char *
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293 systype_name(int systype)
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294 {
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295 int i;
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296
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297 for (i = 0; i < sizeof(systype_names)/sizeof(systype_names[0]); i++)
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298 if (systype_names[i].kind == systype)
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299 return systype_names[i].str;
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300 return "Unknown";
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301 }
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302
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303 // List disk partitions
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304 static void
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305 do_disks(int argc, char *argv[])
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306 {
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307 int i, j;
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308 disk_t *d;
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309 partition_t *p;
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310 char name[16];
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311
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312 for (i = 0, d = disk_table; i < disk_count; i++, d++) {
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313 switch (d->kind) {
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314 case DISK_IDE_HD:
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315 for (j = 0, p = d->partitions; j < CYGNUM_REDBOOT_MAX_PARTITIONS; j++, p++) {
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316 if (p->systype) {
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317 sprintf(name, "hd%c%d", 'a' + d->index, j+1);
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318 printf("%-8s %s\n", name, systype_name(p->systype));
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319 }
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320 }
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321 break;
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322 case DISK_IDE_CDROM:
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323 sprintf(name, "cd%d", d->index);
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324 printf("%-8s ISO9660\n", name);
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325 break;
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326 }
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327 }
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328 }
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329
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330 static void *fileptr;
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331 static partition_t *file_part;
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332
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333 externC int
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334 disk_stream_open(char *filename, int *err)
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335 {
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336 const char *filepath;
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337
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338 // The filename is in <disk>:<path> format.
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339 // Convert to a partition and path.
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340 if (!disk_parse_filename(filename, &file_part, &filepath)) {
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341 *err = diskerr_badname;
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342 return -1;
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343 }
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344
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345 if (file_part->systype == 0 || file_part->funs == (fs_funs_t *)0) {
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346 *err = diskerr_partition;
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347 return -1;
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348 }
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349
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350 fileptr = (file_part->funs->open)(file_part, filepath);
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351 if (fileptr == NULL) {
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352 *err = diskerr_open;
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353 return -1;
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354 }
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355 return 0;
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356 }
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357
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358 externC int
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359 disk_stream_read(char *buf, int size, int *err)
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360 {
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361 int nread;
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362
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363 if ((nread = (file_part->funs->read)(fileptr, buf, size)) != size) {
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364 *err = diskerr_read;
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365 return -1;
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366 }
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367 return nread;
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368 }
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369
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370 externC void
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371 disk_stream_close(int *err)
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372 {
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373 fileptr = NULL;
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374 }
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375
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376 externC char *
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377 disk_error(int err)
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378 {
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379 switch (err) {
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380 case diskerr_badname:
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381 return "Bad filename";
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382 break;
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383 case diskerr_partition:
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384 return "Unsupported filesystem";
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385 break;
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386 case diskerr_open:
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387 return "Can't open file";
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388 break;
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389 case diskerr_read:
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390 return "Can't read file";
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391 break;
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392 default:
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393 return "Unknown error";
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394 break;
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395 }
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396 }
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397