include/grub/msdos_partition.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2001,2002,2004,2007  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef GRUB_PC_PARTITION_HEADER
  20 #define GRUB_PC_PARTITION_HEADER        1
  21
  22 #include <grub/symbol.h>
  23 #include <grub/types.h>
  24 #include <grub/err.h>
  25
  26 /* The signature.  */
  27 #define GRUB_PC_PARTITION_SIGNATURE             0xaa55
  28
  29 /* This is not a flag actually, but used as if it were a flag.  */
  30 #define GRUB_PC_PARTITION_TYPE_HIDDEN_FLAG      0x10
  31
  32 /* DOS partition types.  */
  33 #define GRUB_PC_PARTITION_TYPE_NONE             0
  34 #define GRUB_PC_PARTITION_TYPE_FAT12            1
  35 #define GRUB_PC_PARTITION_TYPE_FAT16_LT32M      4
  36 #define GRUB_PC_PARTITION_TYPE_EXTENDED         5
  37 #define GRUB_PC_PARTITION_TYPE_FAT16_GT32M      6
  38 #define GRUB_PC_PARTITION_TYPE_NTFS             7
  39 #define GRUB_PC_PARTITION_TYPE_FAT32            0xb
  40 #define GRUB_PC_PARTITION_TYPE_FAT32_LBA        0xc
  41 #define GRUB_PC_PARTITION_TYPE_FAT16_LBA        0xe
  42 #define GRUB_PC_PARTITION_TYPE_WIN95_EXTENDED   0xf
  43 #define GRUB_PC_PARTITION_TYPE_EZD              0x55
  44 #define GRUB_PC_PARTITION_TYPE_MINIX            0x80
  45 #define GRUB_PC_PARTITION_TYPE_LINUX_MINIX      0x81
  46 #define GRUB_PC_PARTITION_TYPE_EXT2FS           0x83
  47 #define GRUB_PC_PARTITION_TYPE_LINUX_EXTENDED   0x85
  48 #define GRUB_PC_PARTITION_TYPE_VSTAFS           0x9e
  49 #define GRUB_PC_PARTITION_TYPE_FREEBSD          0xa5
  50 #define GRUB_PC_PARTITION_TYPE_OPENBSD          0xa6
  51 #define GRUB_PC_PARTITION_TYPE_NETBSD           0xa9
  52 #define GRUB_PC_PARTITION_TYPE_HFS              0xaf
  53 #define GRUB_PC_PARTITION_TYPE_GPT_DISK         0xee
  54 #define GRUB_PC_PARTITION_TYPE_LINUX_RAID       0xfd
  55
  56 /* Constants for BSD disk label.  */
  57 #define GRUB_PC_PARTITION_BSD_LABEL_SECTOR      1
  58 #define GRUB_PC_PARTITION_BSD_LABEL_MAGIC       0x82564557
  59 #define GRUB_PC_PARTITION_BSD_MAX_ENTRIES       8
  60
  61 /* BSD partition types.  */
  62 #define GRUB_PC_PARTITION_BSD_TYPE_UNUSED       0
  63 #define GRUB_PC_PARTITION_BSD_TYPE_SWAP         1
  64 #define GRUB_PC_PARTITION_BSD_TYPE_V6           2
  65 #define GRUB_PC_PARTITION_BSD_TYPE_V7           3
  66 #define GRUB_PC_PARTITION_BSD_TYPE_SYSV         4
  67 #define GRUB_PC_PARTITION_BSD_TYPE_V71K         5
  68 #define GRUB_PC_PARTITION_BSD_TYPE_V8           6
  69 #define GRUB_PC_PARTITION_BSD_TYPE_BSDFFS       7
  70 #define GRUB_PC_PARTITION_BSD_TYPE_MSDOS        8
  71 #define GRUB_PC_PARTITION_BSD_TYPE_BSDLFS       9
  72 #define GRUB_PC_PARTITION_BSD_TYPE_OTHER        10
  73 #define GRUB_PC_PARTITION_BSD_TYPE_HPFS         11
  74 #define GRUB_PC_PARTITION_BSD_TYPE_ISO9660      12
  75 #define GRUB_PC_PARTITION_BSD_TYPE_BOOT         13
  76
  77 /* FreeBSD-specific types.  */
  78 #define GRUB_PC_PARTITION_FREEBSD_TYPE_VINUM    14
  79 #define GRUB_PC_PARTITION_FREEBSD_TYPE_RAID     15
  80 #define GRUB_PC_PARTITION_FREEBSD_TYPE_JFS2     21
  81
  82 /* NetBSD-specific types.  */
  83 #define GRUB_PC_PARTITION_NETBSD_TYPE_ADOS      14
  84 #define GRUB_PC_PARTITION_NETBSD_TYPE_HFS       15
  85 #define GRUB_PC_PARTITION_NETBSD_TYPE_FILECORE  16
  86 #define GRUB_PC_PARTITION_NETBSD_TYPE_EXT2FS    17
  87 #define GRUB_PC_PARTITION_NETBSD_TYPE_NTFS      18
  88 #define GRUB_PC_PARTITION_NETBSD_TYPE_RAID      19
  89 #define GRUB_PC_PARTITION_NETBSD_TYPE_CCD       20
  90 #define GRUB_PC_PARTITION_NETBSD_TYPE_JFS2      21
  91 #define GRUB_PC_PARTITION_NETBSD_TYPE_APPLEUFS  22
  92
  93 /* OpenBSD-specific types.  */
  94 #define GRUB_PC_PARTITION_OPENBSD_TYPE_ADOS     14
  95 #define GRUB_PC_PARTITION_OPENBSD_TYPE_HFS      15
  96 #define GRUB_PC_PARTITION_OPENBSD_TYPE_FILECORE 16
  97 #define GRUB_PC_PARTITION_OPENBSD_TYPE_EXT2FS   17
  98 #define GRUB_PC_PARTITION_OPENBSD_TYPE_NTFS     18
  99 #define GRUB_PC_PARTITION_OPENBSD_TYPE_RAID     19
 100
 101 /* The BSD partition entry.  */
 102 struct grub_msdos_partition_bsd_entry
 103 {
 104   grub_uint32_t size;
 105   grub_uint32_t offset;
 106   grub_uint32_t fragment_size;
 107   grub_uint8_t fs_type;
 108   grub_uint8_t fs_fragments;
 109   grub_uint16_t fs_cylinders;
 110 } __attribute__ ((packed));
 111
 112 /* The BSD disk label. Only define members useful for GRUB.  */
 113 struct grub_msdos_partition_disk_label
 114 {
 115   grub_uint32_t magic;
 116   grub_uint8_t padding[128];
 117   grub_uint32_t magic2;
 118   grub_uint16_t checksum;
 119   grub_uint16_t num_partitions;
 120   grub_uint32_t boot_size;
 121   grub_uint32_t superblock_size;
 122   struct grub_msdos_partition_bsd_entry entries[GRUB_PC_PARTITION_BSD_MAX_ENTRIES];
 123 } __attribute__ ((packed));
 124
 125 /* The partition entry.  */
 126 struct grub_msdos_partition_entry
 127 {
 128   /* If active, 0x80, otherwise, 0x00.  */
 129   grub_uint8_t flag;
 130
 131   /* The head of the start.  */
 132   grub_uint8_t start_head;
 133
 134   /* (S | ((C >> 2) & 0xC0)) where S is the sector of the start and C
 135      is the cylinder of the start. Note that S is counted from one.  */
 136   grub_uint8_t start_sector;
 137
 138   /* (C & 0xFF) where C is the cylinder of the start.  */
 139   grub_uint8_t start_cylinder;
 140
 141   /* The partition type.  */
 142   grub_uint8_t type;
 143
 144   /* The end versions of start_head, start_sector and start_cylinder,
 145      respectively.  */
 146   grub_uint8_t end_head;
 147   grub_uint8_t end_sector;
 148   grub_uint8_t end_cylinder;
 149
 150   /* The start sector. Note that this is counted from zero.  */
 151   grub_uint32_t start;
 152
 153   /* The length in sector units.  */
 154   grub_uint32_t length;
 155 } __attribute__ ((packed));
 156
 157 /* The structure of MBR.  */
 158 struct grub_msdos_partition_mbr
 159 {
 160   /* The code area (actually, including BPB).  */
 161   grub_uint8_t code[446];
 162
 163   /* Four partition entries.  */
 164   struct grub_msdos_partition_entry entries[4];
 165
 166   /* The signature 0xaa55.  */
 167   grub_uint16_t signature;
 168 } __attribute__ ((packed));
 169
 170 \f
 171 struct grub_msdos_partition
 172 {
 173     /* The DOS partition number.  */
 174   int dos_part;
 175
 176   /* The BSD partition number (a == 0).  */
 177   int bsd_part;
 178
 179   /* The DOS partition type.  */
 180   int dos_type;
 181
 182   /* The BSD partition type.  */
 183   int bsd_type;
 184
 185   /* The offset of the extended partition.  */
 186   unsigned long ext_offset;
 187 };
 188
 189 static inline int
 190 grub_msdos_partition_is_empty (int type)
 191 {
 192   return (type == GRUB_PC_PARTITION_TYPE_NONE);
 193 }
 194
 195 static inline int
 196 grub_msdos_partition_is_extended (int type)
 197 {
 198   return (type == GRUB_PC_PARTITION_TYPE_EXTENDED
 199           || type == GRUB_PC_PARTITION_TYPE_WIN95_EXTENDED
 200           || type == GRUB_PC_PARTITION_TYPE_LINUX_EXTENDED);
 201 }
 202
 203 static inline int
 204 grub_msdos_partition_is_bsd (int type)
 205 {
 206   return (type == GRUB_PC_PARTITION_TYPE_FREEBSD
 207           || type == GRUB_PC_PARTITION_TYPE_OPENBSD
 208           || type == GRUB_PC_PARTITION_TYPE_NETBSD);
 209 }
 210
 211 #endif /* ! GRUB_PC_PARTITION_HEADER */