include/pt-mbr.h

   1 /*
   2  * No copyright is claimed.  This code is in the public domain; do with
   3  * it what you wish.
   4  */
   5 #ifndef UTIL_LINUX_PT_MBR_H
   6 #define UTIL_LINUX_PT_MBR_H
   7
   8 #include <assert.h>
   9
  10 struct dos_partition {
  11         unsigned char boot_ind;         /* 0x80 - active */
  12         unsigned char bh, bs, bc;       /* begin CHS */
  13         unsigned char sys_ind;
  14         unsigned char eh, es, ec;       /* end CHS */
  15         unsigned char start_sect[4];
  16         unsigned char nr_sects[4];
  17 } __attribute__((packed));
  18
  19 #define MBR_PT_OFFSET           0x1be
  20 #define MBR_PT_BOOTBITS_SIZE    440
  21
  22 static inline struct dos_partition *mbr_get_partition(unsigned char *mbr, int i)
  23 {
  24         return (struct dos_partition *)
  25                 (mbr + MBR_PT_OFFSET + (i * sizeof(struct dos_partition)));
  26 }
  27
  28 /* assemble badly aligned little endian integer */
  29 static inline uint32_t __dos_assemble_4le(const unsigned char *p)
  30 {
  31         uint32_t last_byte = p[3];
  32
  33         return p[0] | (p[1] << 8) | (p[2] << 16) | (last_byte << 24);
  34 }
  35
  36 static inline void __dos_store_4le(unsigned char *p, unsigned int val)
  37 {
  38         assert(!(p == NULL));
  39         p[0] = (val & 0xff);
  40         p[1] = ((val >> 8) & 0xff);
  41         p[2] = ((val >> 16) & 0xff);
  42         p[3] = ((val >> 24) & 0xff);
  43 }
  44
  45 static inline unsigned int dos_partition_get_start(struct dos_partition *p)
  46 {
  47         return __dos_assemble_4le(&(p->start_sect[0]));
  48 }
  49
  50 static inline void dos_partition_set_start(struct dos_partition *p, unsigned int n)
  51 {
  52         __dos_store_4le(p->start_sect, n);
  53 }
  54
  55 static inline unsigned int dos_partition_get_size(struct dos_partition *p)
  56 {
  57         return __dos_assemble_4le(&(p->nr_sects[0]));
  58 }
  59
  60 static inline void dos_partition_set_size(struct dos_partition *p, unsigned int n)
  61 {
  62         __dos_store_4le(p->nr_sects, n);
  63 }
  64
  65 static inline void dos_partition_sync_chs(struct dos_partition *p, unsigned long long int part_offset, unsigned int geom_sectors, unsigned int geom_heads)
  66 {
  67         unsigned long long int start = part_offset + dos_partition_get_start(p);
  68         unsigned long long int stop = start + dos_partition_get_size(p) - 1;
  69         unsigned int spc = geom_heads * geom_sectors;
  70
  71         if (start / spc > 1023)
  72                 start = spc * 1024 - 1;
  73         if (stop / spc > 1023)
  74                 stop = spc * 1024 - 1;
  75
  76         p->bc = (start / spc) & 0xff;
  77         p->bh = (start / geom_sectors) % geom_heads;
  78         p->bs = ((start % geom_sectors + 1) & 0x3f) |
  79                 (((start / spc) >> 2) & 0xc0);
  80
  81         p->ec = (stop / spc) & 0xff;
  82         p->eh = (stop / geom_sectors) % geom_heads;
  83         p->es = ((stop % geom_sectors + 1) & 0x3f) |
  84                 (((stop / spc) >> 2) & 0xc0);
  85 }
  86
  87 static inline int mbr_is_valid_magic(const unsigned char *mbr)
  88 {
  89         return mbr[510] == 0x55 && mbr[511] == 0xaa ? 1 : 0;
  90 }
  91
  92 static inline void mbr_set_magic(unsigned char *b)
  93 {
  94         b[510] = 0x55;
  95         b[511] = 0xaa;
  96 }
  97
  98 static inline unsigned int mbr_get_id(const unsigned char *mbr)
  99 {
 100         return __dos_assemble_4le(&mbr[440]);
 101 }
 102
 103 static inline void mbr_set_id(unsigned char *b, unsigned int id)
 104 {
 105         __dos_store_4le(&b[440], id);
 106 }
 107
 108 enum {
 109         MBR_EMPTY_PARTITION             = 0x00,
 110         MBR_FAT12_PARTITION             = 0x01,
 111         MBR_XENIX_ROOT_PARTITION        = 0x02,
 112         MBR_XENIX_USR_PARTITION         = 0x03,
 113         MBR_FAT16_LESS32M_PARTITION     = 0x04,
 114         MBR_DOS_EXTENDED_PARTITION      = 0x05,
 115         MBR_FAT16_PARTITION             = 0x06, /* DOS 16-bit >=32M */
 116         MBR_HPFS_NTFS_PARTITION         = 0x07, /* OS/2 IFS, eg, HPFS or NTFS or QNX */
 117         MBR_AIX_PARTITION               = 0x08, /* AIX boot (AIX -- PS/2 port) or SplitDrive */
 118         MBR_AIX_BOOTABLE_PARTITION      = 0x09, /* AIX data or Coherent */
 119         MBR_OS2_BOOTMNGR_PARTITION      = 0x0a, /* OS/2 Boot Manager */
 120         MBR_W95_FAT32_PARTITION         = 0x0b,
 121         MBR_W95_FAT32_LBA_PARTITION     = 0x0c, /* LBA really is `Extended Int 13h' */
 122         MBR_W95_FAT16_LBA_PARTITION     = 0x0e,
 123         MBR_W95_EXTENDED_PARTITION      = 0x0f,
 124         MBR_OPUS_PARTITION              = 0x10,
 125         MBR_HIDDEN_FAT12_PARTITION      = 0x11,
 126         MBR_COMPAQ_DIAGNOSTICS_PARTITION = 0x12,
 127         MBR_HIDDEN_FAT16_L32M_PARTITION = 0x14,
 128         MBR_HIDDEN_FAT16_PARTITION      = 0x16,
 129         MBR_HIDDEN_HPFS_NTFS_PARTITION  = 0x17,
 130         MBR_AST_SMARTSLEEP_PARTITION    = 0x18,
 131         MBR_HIDDEN_W95_FAT32_PARTITION  = 0x1b,
 132         MBR_HIDDEN_W95_FAT32LBA_PARTITION = 0x1c,
 133         MBR_HIDDEN_W95_FAT16LBA_PARTITION = 0x1e,
 134         MBR_NEC_DOS_PARTITION           = 0x24,
 135         MBR_PLAN9_PARTITION             = 0x39,
 136         MBR_PARTITIONMAGIC_PARTITION    = 0x3c,
 137         MBR_VENIX80286_PARTITION        = 0x40,
 138         MBR_PPC_PREP_BOOT_PARTITION     = 0x41,
 139         MBR_SFS_PARTITION               = 0x42,
 140         MBR_QNX_4X_PARTITION            = 0x4d,
 141         MBR_QNX_4X_2ND_PARTITION        = 0x4e,
 142         MBR_QNX_4X_3RD_PARTITION        = 0x4f,
 143         MBR_DM_PARTITION                = 0x50,
 144         MBR_DM6_AUX1_PARTITION          = 0x51, /* (or Novell) */
 145         MBR_CPM_PARTITION               = 0x52, /* CP/M or Microport SysV/AT */
 146         MBR_DM6_AUX3_PARTITION          = 0x53,
 147         MBR_DM6_PARTITION               = 0x54,
 148         MBR_EZ_DRIVE_PARTITION          = 0x55,
 149         MBR_GOLDEN_BOW_PARTITION        = 0x56,
 150         MBR_PRIAM_EDISK_PARTITION       = 0x5c,
 151         MBR_SPEEDSTOR_PARTITION         = 0x61,
 152         MBR_GNU_HURD_PARTITION          = 0x63, /* GNU HURD or Mach or Sys V/386 (such as ISC UNIX) */
 153         MBR_UNIXWARE_PARTITION          = MBR_GNU_HURD_PARTITION,
 154         MBR_NETWARE_286_PARTITION       = 0x64,
 155         MBR_NETWARE_386_PARTITION       = 0x65,
 156         MBR_DISKSECURE_MULTIBOOT_PARTITION = 0x70,
 157         MBR_PC_IX_PARTITION             = 0x75,
 158         MBR_OLD_MINIX_PARTITION         = 0x80, /* Minix 1.4a and earlier */
 159         MBR_MINIX_PARTITION             = 0x81, /* Minix 1.4b and later */
 160         MBR_LINUX_SWAP_PARTITION        = 0x82,
 161         MBR_SOLARIS_X86_PARTITION       = MBR_LINUX_SWAP_PARTITION,
 162         MBR_LINUX_DATA_PARTITION        = 0x83,
 163         MBR_OS2_HIDDEN_DRIVE_PARTITION  = 0x84, /* also hibernation MS APM, Intel Rapid Start */
 164         MBR_INTEL_HIBERNATION_PARTITION = MBR_OS2_HIDDEN_DRIVE_PARTITION,
 165         MBR_LINUX_EXTENDED_PARTITION    = 0x85,
 166         MBR_NTFS_VOL_SET1_PARTITION     = 0x86,
 167         MBR_NTFS_VOL_SET2_PARTITION     = 0x87,
 168         MBR_LINUX_PLAINTEXT_PARTITION   = 0x88,
 169         MBR_LINUX_LVM_PARTITION         = 0x8e,
 170         MBR_AMOEBA_PARTITION            = 0x93,
 171         MBR_AMOEBA_BBT_PARTITION        = 0x94, /* (bad block table) */
 172         MBR_BSD_OS_PARTITION            = 0x9f, /* BSDI */
 173         MBR_THINKPAD_HIBERNATION_PARTITION = 0xa0,
 174         MBR_FREEBSD_PARTITION           = 0xa5, /* various BSD flavours */
 175         MBR_OPENBSD_PARTITION           = 0xa6,
 176         MBR_NEXTSTEP_PARTITION          = 0xa7,
 177         MBR_DARWIN_UFS_PARTITION        = 0xa8,
 178         MBR_NETBSD_PARTITION            = 0xa9,
 179         MBR_DARWIN_BOOT_PARTITION       = 0xab,
 180         MBR_HFS_HFS_PARTITION           = 0xaf,
 181         MBR_BSDI_FS_PARTITION           = 0xb7,
 182         MBR_BSDI_SWAP_PARTITION         = 0xb8,
 183         MBR_BOOTWIZARD_HIDDEN_PARTITION = 0xbb,
 184         MBR_ACRONIS_FAT32LBA_PARTITION  = 0xbc, /* Acronis Secure Zone with ipl for loader F11.SYS */
 185         MBR_SOLARIS_BOOT_PARTITION      = 0xbe,
 186         MBR_SOLARIS_PARTITION           = 0xbf,
 187         MBR_DRDOS_FAT12_PARTITION       = 0xc1,
 188         MBR_DRDOS_FAT16_L32M_PARTITION  = 0xc4,
 189         MBR_DRDOS_FAT16_PARTITION       = 0xc6,
 190         MBR_SYRINX_PARTITION            = 0xc7,
 191         MBR_NONFS_DATA_PARTITION        = 0xda,
 192         MBR_CPM_CTOS_PARTITION          = 0xdb, /* CP/M or Concurrent CP/M or Concurrent DOS or CTOS */
 193         MBR_DELL_UTILITY_PARTITION      = 0xde, /* Dell PowerEdge Server utilities */
 194         MBR_BOOTIT_PARTITION            = 0xdf, /* BootIt EMBRM */
 195         MBR_DOS_ACCESS_PARTITION        = 0xe1, /* DOS access or SpeedStor 12-bit FAT extended partition */
 196         MBR_DOS_RO_PARTITION            = 0xe3, /* DOS R/O or SpeedStor */
 197         MBR_SPEEDSTOR_EXTENDED_PARTITION = 0xe4, /* SpeedStor 16-bit FAT extended partition < 1024 cyl. */
 198         MBR_RUFUS_EXTRA_PARTITION       = 0xea, /* Rufus extra partition for alignment */
 199         MBR_BEOS_FS_PARTITION           = 0xeb,
 200         MBR_GPT_PARTITION               = 0xee, /* Intel EFI GUID Partition Table */
 201         MBR_EFI_SYSTEM_PARTITION        = 0xef, /* Intel EFI System Partition */
 202         MBR_LINUX_PARISC_BOOT_PARTITION = 0xf0, /* Linux/PA-RISC boot loader */
 203         MBR_SPEEDSTOR1_PARTITION        = 0xf1,
 204         MBR_SPEEDSTOR2_PARTITION        = 0xf4, /* SpeedStor large partition */
 205         MBR_DOS_SECONDARY_PARTITION     = 0xf2, /* DOS 3.3+ secondary */
 206         MBR_EBBR_PROTECTIVE_PARTITION   = 0xf8, /* Arm EBBR firmware protective partition */
 207         MBR_VMWARE_VMFS_PARTITION       = 0xfb,
 208         MBR_VMWARE_VMKCORE_PARTITION    = 0xfc, /* VMware kernel dump partition */
 209         MBR_LINUX_RAID_PARTITION        = 0xfd, /* Linux raid partition with autodetect using persistent superblock */
 210         MBR_LANSTEP_PARTITION           = 0xfe, /* SpeedStor >1024 cyl. or LANstep */
 211         MBR_XENIX_BBT_PARTITION         = 0xff, /* Xenix Bad Block Table */
 212 };
 213
 214 #endif /* UTIL_LINUX_PT_MBR_H */