msdos.h

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/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
 
#ifndef MSDOS_H
#define MSDOS_H
 
#include "pedigree/kernel/processor/types.h"
 
class Disk;
 
// Identification of an MBR - 0x55 0xAA in bytes 510 and 511 respectively.
#define MSDOS_IDENT_1 0x55
#define MSDOS_IDENT_2 0xAA
 
// Start of partition table in the first sector.
#define MSDOS_PARTTAB_START 0x1BE
// Number of partition entries in one table.
#define MSDOS_PARTTAB_NUM 0x4
#define MSDOS_EXT_PARTTAB_NUM 0x2
 
typedef struct {
  uint8_t active;
  uint8_t start_head;
  uint8_t start_cylinder_low;
  uint8_t start_cylinder_high;
  uint8_t type;
  uint8_t end_head;
  uint8_t end_cylinder_low;
  uint8_t end_cylinder_high;
  uint32_t start_lba;
  uint32_t size;
} __attribute__((packed)) MsdosPartitionInfo;
 
bool msdosProbeDisk(Disk* pDisk);
 
bool msdosReadTable(MsdosPartitionInfo* pPartitions, Disk* pDisk);
 
#endif