grub/include/grub/msdos_partition.h

/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2004,2007  Free Software Foundation, Inc.
 *
 *  GRUB is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GRUB_PC_PARTITION_HEADER
#define GRUB_PC_PARTITION_HEADER	1

#include <grub/symbol.h>
#include <grub/types.h>
#include <grub/err.h>

/* The signature.  */
#define GRUB_PC_PARTITION_SIGNATURE		0xaa55

/* This is not a flag actually, but used as if it were a flag.  */
#define GRUB_PC_PARTITION_TYPE_HIDDEN_FLAG	0x10

/* DOS partition types.  */
#define GRUB_PC_PARTITION_TYPE_NONE		0
#define GRUB_PC_PARTITION_TYPE_FAT12		1
#define GRUB_PC_PARTITION_TYPE_FAT16_LT32M	4
#define GRUB_PC_PARTITION_TYPE_EXTENDED		5
#define GRUB_PC_PARTITION_TYPE_FAT16_GT32M	6
#define GRUB_PC_PARTITION_TYPE_NTFS	        7
#define GRUB_PC_PARTITION_TYPE_FAT32		0xb
#define GRUB_PC_PARTITION_TYPE_FAT32_LBA	0xc
#define GRUB_PC_PARTITION_TYPE_FAT16_LBA	0xe
#define GRUB_PC_PARTITION_TYPE_WIN95_EXTENDED	0xf
#define GRUB_PC_PARTITION_TYPE_EZD		0x55
#define GRUB_PC_PARTITION_TYPE_MINIX		0x80
#define GRUB_PC_PARTITION_TYPE_LINUX_MINIX	0x81
#define GRUB_PC_PARTITION_TYPE_EXT2FS		0x83
#define GRUB_PC_PARTITION_TYPE_LINUX_EXTENDED	0x85
#define GRUB_PC_PARTITION_TYPE_VSTAFS		0x9e
#define GRUB_PC_PARTITION_TYPE_FREEBSD		0xa5
#define GRUB_PC_PARTITION_TYPE_OPENBSD		0xa6
#define GRUB_PC_PARTITION_TYPE_NETBSD		0xa9
#define GRUB_PC_PARTITION_TYPE_HFS		0xaf
#define GRUB_PC_PARTITION_TYPE_GPT_DISK		0xee
#define GRUB_PC_PARTITION_TYPE_LINUX_RAID	0xfd

/* The partition entry.  */
struct grub_msdos_partition_entry
{
  /* If active, 0x80, otherwise, 0x00.  */
  grub_uint8_t flag;

  /* The head of the start.  */
  grub_uint8_t start_head;

  /* (S | ((C >> 2) & 0xC0)) where S is the sector of the start and C
     is the cylinder of the start. Note that S is counted from one.  */
  grub_uint8_t start_sector;

  /* (C & 0xFF) where C is the cylinder of the start.  */
  grub_uint8_t start_cylinder;

  /* The partition type.  */
  grub_uint8_t type;

  /* The end versions of start_head, start_sector and start_cylinder,
     respectively.  */
  grub_uint8_t end_head;
  grub_uint8_t end_sector;
  grub_uint8_t end_cylinder;

  /* The start sector. Note that this is counted from zero.  */
  grub_uint32_t start;

  /* The length in sector units.  */
  grub_uint32_t length;
} __attribute__ ((packed));

/* The structure of MBR.  */
struct grub_msdos_partition_mbr
{
  /* The code area (actually, including BPB).  */
  grub_uint8_t code[446];

  /* Four partition entries.  */
  struct grub_msdos_partition_entry entries[4];

  /* The signature 0xaa55.  */
  grub_uint16_t signature;
} __attribute__ ((packed));



static inline int
grub_msdos_partition_is_empty (int type)
{
  return (type == GRUB_PC_PARTITION_TYPE_NONE);
}

static inline int
grub_msdos_partition_is_extended (int type)
{
  return (type == GRUB_PC_PARTITION_TYPE_EXTENDED
	  || type == GRUB_PC_PARTITION_TYPE_WIN95_EXTENDED
	  || type == GRUB_PC_PARTITION_TYPE_LINUX_EXTENDED);
}

#endif /* ! GRUB_PC_PARTITION_HEADER */