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 */ 108 109