src/add-ons/kernel/partitioning_systems/atari/atari.h

   1 /*
   2 ** Copyright 2003, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3 ** Distributed under the terms of the OpenBeOS License.
   4 */
   5 #ifndef ATARI_PARTITION_H
   6 #define ATARI_PARTITION_H
   7
   8 /*
   9  * An extented partition scheme exists, (several actually), cf.
  10  * http://people.debian.org/~smarenka/d-i/atari-fdisk-README
  11  * boot sector stuff:
  12  * http://leonard.oxg.free.fr/articles/multi_atari/multi_atari.html
  13  */
  14
  15 #include "SupportDefs.h"
  16 #include "ByteOrder.h"
  17
  18 /* this one is BIG endian */
  19 struct atari_partition_entry {
  20 #define ATARI_PART_EXISTS       0x01
  21 #define ATARI_PART_BOOTABLE     0x80
  22         uint8   flags;
  23         /* some known types */
  24 #define ATARI_PART_TYPE_GEM 'G', 'E', 'M'
  25 #define ATARI_PART_TYPE_LNX 'L', 'N', 'X'
  26 #define ATARI_PART_TYPE_OS9 'O', 'S', '9'
  27         /* the one we'll use */
  28 #define ATARI_PART_TYPE_BFS 'B', 'F', 'S'
  29         char    id[3];
  30         uint32  start;
  31         uint32  size;
  32
  33         uint8 Flags() const { return flags; }
  34         uint32 Start() const { return B_BENDIAN_TO_HOST_INT32(start); }
  35         uint32 Size() const { return B_BENDIAN_TO_HOST_INT32(size); }
  36 } _PACKED ;
  37
  38
  39 /* this one is BIG endian */
  40 struct atari_root_block {
  41         uint8   bootcode[0x1b6];
  42         uint16  cylinder_count;
  43         uint8   head_count;
  44         uint8   _reserved_1[1];
  45         uint16  reduced_write_current_cylinder;
  46         uint16  write_precomp_cynlinder;
  47         uint8   landing_zone;
  48         uint8   seek_rate_code;
  49         uint8   interleave_factor;
  50         uint8   sectors_per_track;
  51         uint32  maximum_partition_size; /* in sectors (in clusters) */
  52         struct atari_partition_entry    partitions[4];
  53         uint32  bad_sector_list_start;
  54         uint32  bad_sector_list_count;
  55 #define ATARI_BOOTABLE_MAGIC    0x1234
  56         uint16  checksum; /* checksum? 0x1234 for bootable */
  57
  58         uint32 MaxPartitionSize() const { return B_BENDIAN_TO_HOST_INT16(maximum_partition_size); }
  59         uint32 BadSectorsStart() const { return B_BENDIAN_TO_HOST_INT32(bad_sector_list_start); }
  60         uint32 BadSectorsCount() const { return B_BENDIAN_TO_HOST_INT32(bad_sector_list_count); }
  61         uint16 Checksum() const { return B_BENDIAN_TO_HOST_INT16(checksum); }
  62 } _PACKED ;
  63
  64 /************* bad blocks *************/
  65
  66 struct bad_block_entry {
  67 };
  68
  69 struct bad_block_block {
  70 };
  71
  72 /************* partition block *************/
  73
  74 /* this one is BIG endian, but with LITTLE endian fields! marked LE */
  75 /* this is part of the filesystem... */
  76 struct atari_boot_block {
  77         uint16  branch; /* branch code */
  78         char    volume_id[6];
  79         uint8   disk_id[3];
  80         uint16  bytes_per_sector;       /* LE */
  81         uint8   sectors_per_cluster;
  82         uint16  reserved_sectors;       /* LE */
  83         uint8   fat_count;
  84         uint16  entries_in_root_dir;    /* LE */
  85         uint16  sector_count;           /* LE */
  86         uint8   media_descriptor;
  87         uint16  sectors_per_fat;        /* LE */
  88         uint16  sectors_per_track;      /* LE */
  89         uint16  side_count;             /* LE */
  90         uint16  hidden_sector_count;    /* LE */
  91         /* boot code... */
  92         uint16  execflag;
  93         uint16  loadmode;
  94         uint16  first_sector;
  95         uint16  num_sectors;
  96         uint32  load_addr;
  97         uint32  fat_buffer;
  98 #define ATARI_BB_FILENAME_SZ (0x003a - 0x002e)
  99         char    filename[ATARI_BB_FILENAME_SZ];
 100 #define ATARI_BB_BOOTCODE_SZ (0x01fe - 0x003a)
 101         uint8   bootcode[ATARI_BB_BOOTCODE_SZ];
 102         uint16  checksum;       /* 0x1234 if bootable */
 103 };
 104
 105
 106
 107 #endif  /* ATARI_PARTITION_H */
 108