/src/util-linux/include/pt-mbr.h

Source (jump to first uncovered line)
/*
 * No copyright is claimed.  This code is in the public domain; do with
 * it what you wish.
 */
#ifndef UTIL_LINUX_PT_MBR_H
#define UTIL_LINUX_PT_MBR_H

#include <assert.h>

struct dos_partition {
  unsigned char boot_ind;   /* 0x80 - active */
  unsigned char bh, bs, bc; /* begin CHS */
  unsigned char sys_ind;
  unsigned char eh, es, ec; /* end CHS */
  unsigned char start_sect[4];
  unsigned char nr_sects[4];
} __attribute__((packed));

#define MBR_PT_OFFSET   0x1be
#define MBR_PT_BOOTBITS_SIZE  440

static inline struct dos_partition *mbr_get_partition(const unsigned char *mbr, int i)
{
  return (struct dos_partition *)
    (mbr + MBR_PT_OFFSET + (i * sizeof(struct dos_partition)));
}

/* assemble badly aligned little endian integer */
static inline uint32_t __dos_assemble_4le(const unsigned char *p)
{
  uint32_t last_byte = p[3];

  return p[0] | (p[1] << 8) | (p[2] << 16) | (last_byte << 24);
}

static inline void __dos_store_4le(unsigned char *p, unsigned int val)
{
  assert(!(p == NULL));
  p[0] = (val & 0xff);
  p[1] = ((val >> 8) & 0xff);
  p[2] = ((val >> 16) & 0xff);
  p[3] = ((val >> 24) & 0xff);
}

static inline unsigned int dos_partition_get_start(const struct dos_partition *p)
{
  return __dos_assemble_4le(&(p->start_sect[0]));
}

static inline void dos_partition_set_start(struct dos_partition *p, unsigned int n)
{
  __dos_store_4le(p->start_sect, n);
}

static inline unsigned int dos_partition_get_size(const struct dos_partition *p)
{
  return __dos_assemble_4le(&(p->nr_sects[0]));
}

static inline void dos_partition_set_size(struct dos_partition *p, unsigned int n)
{
  __dos_store_4le(p->nr_sects, n);
}

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)
{
  unsigned long long int start = part_offset + dos_partition_get_start(p);
  unsigned long long int stop = start + dos_partition_get_size(p) - 1;
  unsigned int spc = geom_heads * geom_sectors;

  if (start / spc > 1023)
    start = spc * 1024 - 1;
  if (stop / spc > 1023)
    stop = spc * 1024 - 1;

  p->bc = (start / spc) & 0xff;
  p->bh = (start / geom_sectors) % geom_heads;
  p->bs = ((start % geom_sectors + 1) & 0x3f) |
    (((start / spc) >> 2) & 0xc0);

  p->ec = (stop / spc) & 0xff;
  p->eh = (stop / geom_sectors) % geom_heads;
  p->es = ((stop % geom_sectors + 1) & 0x3f) |
    (((stop / spc) >> 2) & 0xc0);
}

static inline int mbr_is_valid_magic(const unsigned char *mbr)
{
  return mbr[510] == 0x55 && mbr[511] == 0xaa ? 1 : 0;
}

static inline void mbr_set_magic(unsigned char *b)
{
  b[510] = 0x55;
  b[511] = 0xaa;
}

static inline unsigned int mbr_get_id(const unsigned char *mbr)
{
  return __dos_assemble_4le(&mbr[440]);
}

static inline void mbr_set_id(unsigned char *b, unsigned int id)
{
  __dos_store_4le(&b[440], id);
}

enum {
  MBR_EMPTY_PARTITION   = 0x00,
  MBR_FAT12_PARTITION   = 0x01,
  MBR_XENIX_ROOT_PARTITION  = 0x02,
  MBR_XENIX_USR_PARTITION   = 0x03,
  MBR_FAT16_LESS32M_PARTITION = 0x04,
  MBR_DOS_EXTENDED_PARTITION  = 0x05,
  MBR_FAT16_PARTITION   = 0x06, /* DOS 16-bit >=32M */
  MBR_HPFS_NTFS_PARTITION   = 0x07, /* OS/2 IFS, e.g., HPFS or NTFS or QNX or exFAT */
  MBR_AIX_PARTITION   = 0x08, /* AIX boot (AIX -- PS/2 port) or SplitDrive */
  MBR_AIX_BOOTABLE_PARTITION  = 0x09, /* AIX data or Coherent */
  MBR_OS2_BOOTMNGR_PARTITION  = 0x0a, /* OS/2 Boot Manager */
  MBR_W95_FAT32_PARTITION   = 0x0b,
  MBR_W95_FAT32_LBA_PARTITION = 0x0c, /* LBA really is `Extended Int 13h' */
  MBR_W95_FAT16_LBA_PARTITION = 0x0e,
  MBR_W95_EXTENDED_PARTITION  = 0x0f,
  MBR_OPUS_PARTITION    = 0x10,
  MBR_HIDDEN_FAT12_PARTITION  = 0x11,
  MBR_COMPAQ_DIAGNOSTICS_PARTITION = 0x12,
  MBR_HIDDEN_FAT16_L32M_PARTITION = 0x14,
  MBR_HIDDEN_FAT16_PARTITION  = 0x16,
  MBR_HIDDEN_HPFS_NTFS_PARTITION  = 0x17,
  MBR_AST_SMARTSLEEP_PARTITION  = 0x18,
  MBR_HIDDEN_W95_FAT32_PARTITION  = 0x1b,
  MBR_HIDDEN_W95_FAT32LBA_PARTITION = 0x1c,
  MBR_HIDDEN_W95_FAT16LBA_PARTITION = 0x1e,
  MBR_NEC_DOS_PARTITION   = 0x24,
  MBR_PLAN9_PARTITION   = 0x39,
  MBR_PARTITIONMAGIC_PARTITION  = 0x3c,
  MBR_VENIX80286_PARTITION  = 0x40,
  MBR_PPC_PREP_BOOT_PARTITION = 0x41,
  MBR_SFS_PARTITION   = 0x42,
  MBR_QNX_4X_PARTITION    = 0x4d,
  MBR_QNX_4X_2ND_PARTITION  = 0x4e,
  MBR_QNX_4X_3RD_PARTITION  = 0x4f,
  MBR_DM_PARTITION    = 0x50,
  MBR_DM6_AUX1_PARTITION    = 0x51, /* (or Novell) */
  MBR_CPM_PARTITION   = 0x52, /* CP/M or Microport SysV/AT */
  MBR_DM6_AUX3_PARTITION    = 0x53,
  MBR_DM6_PARTITION   = 0x54,
  MBR_EZ_DRIVE_PARTITION    = 0x55,
  MBR_GOLDEN_BOW_PARTITION  = 0x56,
  MBR_PRIAM_EDISK_PARTITION = 0x5c,
  MBR_SPEEDSTOR_PARTITION   = 0x61,
  MBR_GNU_HURD_PARTITION    = 0x63, /* GNU HURD or Mach or Sys V/386 (such as ISC UNIX) */
  MBR_UNIXWARE_PARTITION    = MBR_GNU_HURD_PARTITION,
  MBR_NETWARE_286_PARTITION = 0x64,
  MBR_NETWARE_386_PARTITION = 0x65,
  MBR_DISKSECURE_MULTIBOOT_PARTITION = 0x70,
  MBR_PC_IX_PARTITION   = 0x75,
  MBR_OLD_MINIX_PARTITION   = 0x80, /* Minix 1.4a and earlier */
  MBR_MINIX_PARTITION   = 0x81, /* Minix 1.4b and later */
  MBR_LINUX_SWAP_PARTITION  = 0x82,
  MBR_SOLARIS_X86_PARTITION = MBR_LINUX_SWAP_PARTITION,
  MBR_LINUX_DATA_PARTITION  = 0x83,
  MBR_OS2_HIDDEN_DRIVE_PARTITION  = 0x84, /* also hibernation MS APM, Intel Rapid Start */
  MBR_INTEL_HIBERNATION_PARTITION = MBR_OS2_HIDDEN_DRIVE_PARTITION,
  MBR_LINUX_EXTENDED_PARTITION  = 0x85,
  MBR_NTFS_VOL_SET1_PARTITION = 0x86,
  MBR_NTFS_VOL_SET2_PARTITION = 0x87,
  MBR_LINUX_PLAINTEXT_PARTITION = 0x88,
  MBR_LINUX_LVM_PARTITION   = 0x8e,
  MBR_AMOEBA_PARTITION    = 0x93,
  MBR_AMOEBA_BBT_PARTITION  = 0x94, /* (bad block table) */
  MBR_BSD_OS_PARTITION    = 0x9f, /* BSDI */
  MBR_THINKPAD_HIBERNATION_PARTITION = 0xa0,
  MBR_FREEBSD_PARTITION   = 0xa5, /* various BSD flavours */
  MBR_OPENBSD_PARTITION   = 0xa6,
  MBR_NEXTSTEP_PARTITION    = 0xa7,
  MBR_DARWIN_UFS_PARTITION  = 0xa8,
  MBR_NETBSD_PARTITION    = 0xa9,
  MBR_DARWIN_BOOT_PARTITION = 0xab,
  MBR_HFS_HFS_PARTITION   = 0xaf,
  MBR_BSDI_FS_PARTITION   = 0xb7,
  MBR_BSDI_SWAP_PARTITION   = 0xb8,
  MBR_BOOTWIZARD_HIDDEN_PARTITION = 0xbb,
  MBR_ACRONIS_FAT32LBA_PARTITION  = 0xbc, /* Acronis Secure Zone with ipl for loader F11.SYS */
  MBR_SOLARIS_BOOT_PARTITION  = 0xbe,
  MBR_SOLARIS_PARTITION   = 0xbf,
  MBR_DRDOS_FAT12_PARTITION = 0xc1,
  MBR_DRDOS_FAT16_L32M_PARTITION  = 0xc4,
  MBR_DRDOS_FAT16_PARTITION = 0xc6,
  MBR_SYRINX_PARTITION    = 0xc7,
  MBR_NONFS_DATA_PARTITION  = 0xda,
  MBR_CPM_CTOS_PARTITION    = 0xdb, /* CP/M or Concurrent CP/M or Concurrent DOS or CTOS */
  MBR_DELL_UTILITY_PARTITION  = 0xde, /* Dell PowerEdge Server utilities */
  MBR_BOOTIT_PARTITION    = 0xdf, /* BootIt EMBRM */
  MBR_DOS_ACCESS_PARTITION  = 0xe1, /* DOS access or SpeedStor 12-bit FAT extended partition */
  MBR_DOS_RO_PARTITION    = 0xe3, /* DOS R/O or SpeedStor */
  MBR_SPEEDSTOR_EXTENDED_PARTITION = 0xe4, /* SpeedStor 16-bit FAT extended partition < 1024 cyl. */
  MBR_RUFUS_EXTRA_PARTITION = 0xea, /* Rufus extra partition for alignment */
  MBR_BEOS_FS_PARTITION   = 0xeb,
  MBR_GPT_PARTITION   = 0xee, /* Intel EFI GUID Partition Table */
  MBR_EFI_SYSTEM_PARTITION  = 0xef, /* Intel EFI System Partition */
  MBR_LINUX_PARISC_BOOT_PARTITION = 0xf0, /* Linux/PA-RISC boot loader */
  MBR_SPEEDSTOR1_PARTITION  = 0xf1,
  MBR_SPEEDSTOR2_PARTITION  = 0xf4, /* SpeedStor large partition */
  MBR_DOS_SECONDARY_PARTITION = 0xf2, /* DOS 3.3+ secondary */
  MBR_EBBR_PROTECTIVE_PARTITION = 0xf8, /* Arm EBBR firmware protective partition */
  MBR_VMWARE_VMFS_PARTITION = 0xfb,
  MBR_VMWARE_VMKCORE_PARTITION  = 0xfc, /* VMware kernel dump partition */
  MBR_LINUX_RAID_PARTITION  = 0xfd, /* Linux raid partition with autodetect using persistent superblock */
  MBR_LANSTEP_PARTITION   = 0xfe, /* SpeedStor >1024 cyl. or LANstep */
  MBR_XENIX_BBT_PARTITION   = 0xff, /* Xenix Bad Block Table */
};

#endif /* UTIL_LINUX_PT_MBR_H */

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Created: 2025-06-13 06:36