1 | /** |
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2 | * @file rtems/ide_part_table.h |
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3 | * |
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4 | * Support for "MS-DOS-style" partition tables |
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5 | */ |
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6 | |
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7 | /* |
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8 | * Copyright (C) 2002 OKTET Ltd., St.-Petersburg, Russia |
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9 | * |
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10 | * Author: Konstantin Abramenko <Konstantin.Abramenko@oktet.ru> |
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11 | * Alexander Kukuta <Alexander.Kukuta@oktet.ru> |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.com/license/LICENSE. |
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16 | * |
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17 | * $Id$ |
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18 | * |
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19 | *****************************************************************************/ |
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20 | |
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21 | #ifndef _RTEMS_IDE_PART_TABLE_H |
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22 | #define _RTEMS_IDE_PART_TABLE_H |
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23 | |
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24 | #include <assert.h> |
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25 | #include <rtems/chain.h> |
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26 | #include <stdio.h> |
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27 | #include <stdlib.h> |
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28 | #include <string.h> |
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29 | #include <errno.h> |
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30 | #include <sys/ioctl.h> |
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31 | #include <sys/types.h> |
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32 | #include <sys/stat.h> |
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33 | #include <unistd.h> |
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34 | #include <fcntl.h> |
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35 | #include <rtems.h> |
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36 | #include <rtems/blkdev.h> |
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37 | #include <rtems/libio.h> |
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38 | #include <rtems/libio_.h> |
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39 | #include <rtems/bdbuf.h> |
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40 | #include <rtems/seterr.h> |
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41 | |
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42 | /* Minor base number for all logical devices */ |
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43 | #define RTEMS_IDE_SECTOR_BITS 9 |
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44 | #define RTEMS_IDE_SECTOR_SIZE 512 |
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45 | #define RTEMS_IDE_PARTITION_DESCRIPTOR_SIZE 16 |
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46 | #define RTEMS_IDE_PARTITION_MAX_PARTITION_NUMBER 63 |
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47 | #define RTEMS_IDE_PARTITION_MAX_SUB_PARTITION_NUMBER 4 |
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48 | #define RTEMS_IDE_PARTITION_DEV_NAME_LENGTH_MAX 16 |
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49 | |
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50 | #define RTEMS_IDE_PARTITION_MSDOS_SIGNATURE_DATA1 0x55 |
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51 | #define RTEMS_IDE_PARTITION_MSDOS_SIGNATURE_DATA2 0xaa |
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52 | #define RTEMS_IDE_PARTITION_MSDOS_SIGNATURE_OFFSET 0x1fe |
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53 | #define RTEMS_IDE_PARTITION_TABLE_OFFSET 0x1be |
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54 | #define RTEMS_IDE_PARTITION_TABLE_SIZE (4 * 16) |
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55 | #define RTEMS_IDE_PARTITION_BOOTABLE_OFFSET 0 |
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56 | #define RTEMS_IDE_PARTITION_SYS_TYPE_OFFSET 4 |
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57 | #define RTEMS_IDE_PARTITION_START_OFFSET 8 |
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58 | #define RTEMS_IDE_PARTITION_SIZE_OFFSET 12 |
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59 | |
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60 | /* |
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61 | * Conversion from and to little-endian byte order. (no-op on i386/i486) |
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62 | */ |
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63 | |
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64 | #if (CPU_BIG_ENDIAN == TRUE) |
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65 | # define LE_TO_CPU_U16(v) CPU_swap_u16(v) |
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66 | # define LE_TO_CPU_U32(v) CPU_swap_u32(v) |
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67 | # define CPU_TO_LE_U16(v) CPU_swap_u16(v) |
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68 | # define CPU_TO_LE_U32(v) CPU_swap_u32(v) |
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69 | #else |
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70 | # define LE_TO_CPU_U16(v) (v) |
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71 | # define LE_TO_CPU_U32(v) (v) |
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72 | # define CPU_TO_LE_U16(v) (v) |
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73 | # define CPU_TO_LE_U32(v) (v) |
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74 | #endif |
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75 | |
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76 | |
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77 | /* |
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78 | * sector_data_t -- |
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79 | * corresponds to the sector on the device |
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80 | */ |
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81 | typedef struct rtems_sector_data_s |
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82 | { |
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83 | uint32_t sector_num; /* sector number on the device */ |
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84 | uint8_t data[0]; /* raw sector data */ |
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85 | } rtems_sector_data_t; |
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86 | |
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87 | |
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88 | /* |
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89 | * Enum partition types |
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90 | * see list at http://ata-atapi.com/hiwtab.htm |
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91 | * |
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92 | * @todo Should these have RTEMS before them. |
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93 | */ |
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94 | enum { |
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95 | EMPTY_PARTITION = 0x00, |
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96 | DOS_FAT12_PARTITION = 0x01, |
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97 | DOS_FAT16_PARTITION = 0x04, |
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98 | EXTENDED_PARTITION = 0x05, |
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99 | DOS_P32MB_PARTITION = 0x06, |
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100 | FAT32_PARTITION = 0x0B, |
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101 | FAT32_LBA_PARTITION = 0x0C, |
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102 | FAT16_LBA_PARTITION = 0x0E, |
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103 | DM6_PARTITION = 0x54, |
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104 | EZD_PARTITION = 0x55, |
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105 | DM6_AUX1PARTITION = 0x51, |
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106 | DM6_AUX3PARTITION = 0x53, |
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107 | LINUX_SWAP = 0x82, |
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108 | LINUX_NATIVE = 0x83, |
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109 | LINUX_EXTENDED = 0x85 |
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110 | }; |
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111 | |
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112 | |
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113 | /* Forward declaration */ |
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114 | struct rtems_disk_desc_s; |
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115 | |
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116 | /* |
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117 | * part_desc_t -- |
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118 | * contains all neccessary information about partition |
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119 | */ |
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120 | typedef struct rtems_part_desc_s { |
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121 | uint8_t bootable; /* is the partition active */ |
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122 | uint8_t sys_type; /* type of partition */ |
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123 | uint8_t log_id; /* logical number of partition */ |
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124 | uint32_t start; /* first partition sector, in absolute |
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125 | * numeration */ |
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126 | uint32_t size; /* size in sectors */ |
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127 | uint32_t end; /* last partition sector, end = start + size - 1 */ |
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128 | struct rtems_disk_desc_s *disk_desc; /* descriptor of disk, partition |
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129 | * contains in */ |
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130 | struct rtems_part_desc_s *ext_part; /* extended partition containing this |
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131 | * one */ |
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132 | |
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133 | /* partitions, containing in this one */ |
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134 | struct rtems_part_desc_s *sub_part[RTEMS_IDE_PARTITION_MAX_SUB_PARTITION_NUMBER]; |
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135 | } rtems_part_desc_t; |
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136 | |
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137 | |
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138 | |
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139 | typedef struct rtems_disk_desc_s { |
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140 | dev_t dev; /* device number */ |
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141 | |
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142 | /* device name in /dev filesystem */ |
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143 | char dev_name[RTEMS_IDE_PARTITION_DEV_NAME_LENGTH_MAX]; |
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144 | |
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145 | uint32_t sector_size; /* size of sector */ |
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146 | uint32_t sector_bits; /* the base-2 logarithm of sector_size */ |
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147 | uint32_t lba_size; /* total amount of sectors in lba address mode */ |
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148 | int last_log_id; /* used for logical disks enumerating */ |
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149 | |
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150 | /* primary partition descriptors */ |
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151 | rtems_part_desc_t *partitions[RTEMS_IDE_PARTITION_MAX_PARTITION_NUMBER]; |
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152 | } rtems_disk_desc_t; |
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153 | |
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154 | #ifdef __cplusplus |
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155 | extern "C" { |
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156 | #endif |
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157 | |
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158 | /* |
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159 | * rtems_ide_part_table_free -- |
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160 | * frees disk descriptor structure |
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161 | * |
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162 | * PARAMETERS: |
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163 | * disk_desc - disc descriptor structure to free |
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164 | * |
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165 | * RETURNS: |
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166 | * N/A |
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167 | */ |
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168 | void |
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169 | rtems_ide_part_table_free(rtems_disk_desc_t *disk_desc); |
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170 | |
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171 | |
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172 | /* |
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173 | * rtems_ide_part_table_get -- |
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174 | * reads partition table structure from the device |
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175 | * and creates disk description structure |
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176 | * |
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177 | * PARAMETERS: |
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178 | * dev_name - path to physical device in /dev filesystem |
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179 | * disk_desc - returned disc description structure |
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180 | * |
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181 | * RETURNS: |
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182 | * RTEMS_SUCCESSFUL if success, or -1 and corresponding errno else |
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183 | */ |
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184 | rtems_status_code |
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185 | rtems_ide_part_table_get(const char *dev_name, rtems_disk_desc_t *disk_desc); |
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186 | |
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187 | |
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188 | /* |
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189 | * rtems_ide_part_table_initialize -- |
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190 | * initializes logical devices on the physical IDE drive |
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191 | * |
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192 | * PARAMETERS: |
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193 | * dev_name - path to physical device in /dev filesystem |
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194 | * |
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195 | * RETURNS: |
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196 | * RTEMS_SUCCESSFUL if success, or -1 and corresponding errno else |
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197 | */ |
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198 | rtems_status_code |
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199 | rtems_ide_part_table_initialize(char *dev_name); |
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200 | |
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201 | #ifdef __cplusplus |
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202 | } |
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203 | #endif |
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204 | |
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205 | #endif /* _RTEMS_IDE_PART_TABLE_H */ |
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