1 /* 2 libparted 3 Copyright (C) 1998, 1999, 2000, 2007 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #ifndef PED_FAT_BOOTSECTOR_H 20 #define PED_FAT_BOOTSECTOR_H 21 22 typedef struct _FatBootSector FatBootSector; 23 typedef struct _FatInfoSector FatInfoSector; 24 25 #include "fat.h" 26 27 #define FAT32_INFO_MAGIC1 0x41615252 28 #define FAT32_INFO_MAGIC2 0x61417272 29 #define FAT32_INFO_MAGIC3 0xaa55 30 31 /* stolen from mkdosfs, by Dave Hudson */ 32 33 #define FAT_BOOT_MESSAGE \ 34 "This partition does not have an operating system loader installed on it.\n\r"\ 35 "Press a key to reboot..." 36 37 #define FAT_BOOT_JUMP "\xeb\x58\x90" /* jmp +5a */ 38 39 #define FAT_BOOT_CODE "\x0e" /* push cs */ \ 40 "\x1f" /* pop ds */ \ 41 "\xbe\x74\x7e" /* mov si, offset message */ \ 42 /* write_msg_loop: */ \ 43 "\xac" /* lodsb */ \ 44 "\x22\xc0" /* and al, al */ \ 45 "\x74\x06" /* jz done (+8) */ \ 46 "\xb4\x0e" /* mov ah, 0x0e */ \ 47 "\xcd\x10" /* int 0x10 */ \ 48 "\xeb\xf5" /* jmp write_msg_loop */ \ 49 /* done: */ \ 50 "\xb4\x00" /* mov ah, 0x00 */ \ 51 "\xcd\x16" /* int 0x16 */ \ 52 "\xb4\x00" /* mov ah, 0x00 */ \ 53 "\xcd\x19" /* int 0x19 */ \ 54 "\xeb\xfe" /* jmp +0 - in case int 0x19 */ \ 55 /* doesn't work */ \ 56 /* message: */ \ 57 FAT_BOOT_MESSAGE 58 59 #define FAT_BOOT_CODE_LENGTH 128 60 61 #ifdef __sun 62 #define __attribute__(X) /*nothing*/ 63 #endif /* __sun */ 64 65 #ifdef __sun 66 #pragma pack(1) 67 #endif 68 struct __attribute__ ((packed)) _FatBootSector { 69 uint8_t boot_jump[3]; /* 00: Boot strap short or near jump */ 70 uint8_t system_id[8]; /* 03: system name */ 71 uint16_t sector_size; /* 0b: bytes per logical sector */ 72 uint8_t cluster_size; /* 0d: sectors/cluster */ 73 uint16_t reserved; /* 0e: reserved sectors */ 74 uint8_t fats; /* 10: number of FATs */ 75 uint16_t dir_entries; /* 11: number of root directory entries */ 76 uint16_t sectors; /* 13: if 0, total_sect supersedes */ 77 uint8_t media; /* 15: media code */ 78 uint16_t fat_length; /* 16: sectors/FAT for FAT12/16 */ 79 uint16_t secs_track; /* 18: sectors per track */ 80 uint16_t heads; /* 1a: number of heads */ 81 uint32_t hidden; /* 1c: hidden sectors (partition start) */ 82 uint32_t sector_count; /* 20: no. of sectors (if sectors == 0) */ 83 84 union __attribute__ ((packed)) { 85 /* FAT16 fields */ 86 struct __attribute__ ((packed)) { 87 uint8_t drive_num; /* 24: */ 88 uint8_t empty_1; /* 25: */ 89 uint8_t ext_signature; /* 26: always 0x29 */ 90 uint32_t serial_number; /* 27: */ 91 uint8_t volume_name [11]; /* 2b: */ 92 uint8_t fat_name [8]; /* 36: */ 93 uint8_t boot_code[448]; /* 3f: Boot code (or message) */ 94 } fat16; 95 /* FAT32 fields */ 96 struct __attribute__ ((packed)) { 97 uint32_t fat_length; /* 24: size of FAT in sectors */ 98 uint16_t flags; /* 28: bit8: fat mirroring, low4: active fat */ 99 uint16_t version; /* 2a: minor * 256 + major */ 100 uint32_t root_dir_cluster; /* 2c: */ 101 uint16_t info_sector; /* 30: */ 102 uint16_t backup_sector; /* 32: */ 103 uint8_t empty_1 [12]; /* 34: */ 104 uint16_t drive_num; /* 40: */ 105 uint8_t ext_signature; /* 42: always 0x29 */ 106 uint32_t serial_number; /* 43: */ 107 uint8_t volume_name [11]; /* 47: */ 108 uint8_t fat_name [8]; /* 52: */ 109 uint8_t boot_code[420]; /* 5a: Boot code (or message) */ 110 } fat32; 111 } u; 112 113 uint16_t boot_sign; /* 1fe: always 0xAA55 */ 114 }; 115 116 struct __attribute__ ((packed)) _FatInfoSector { 117 uint32_t signature_1; /* should be 0x41615252 */ 118 uint8_t unused [480]; 119 uint32_t signature_2; /* should be 0x61417272 */ 120 uint32_t free_clusters; 121 uint32_t next_cluster; /* most recently allocated cluster */ 122 uint8_t unused2 [0xe]; 123 uint16_t signature_3; /* should be 0xaa55 */ 124 }; 125 #ifdef __sun 126 #pragma pack() 127 #endif 128 129 int fat_boot_sector_read (FatBootSector* bs, const PedGeometry* geom); 130 FatType fat_boot_sector_probe_type (const FatBootSector* bs, 131 const PedGeometry* geom); 132 int fat_boot_sector_analyse (FatBootSector* bs, PedFileSystem* fs); 133 int fat_boot_sector_set_boot_code (FatBootSector* bs); 134 int fat_boot_sector_generate (FatBootSector* bs, const PedFileSystem* fs); 135 int fat_boot_sector_write (const FatBootSector* bs, PedFileSystem* fs); 136 137 int fat_info_sector_read (FatInfoSector* is, const PedFileSystem* fs); 138 int fat_info_sector_generate (FatInfoSector* is, const PedFileSystem* fs); 139 int fat_info_sector_write (const FatInfoSector* is, PedFileSystem* fs); 140 141 #endif /* PED_FAT_BOOTSECTOR_H */ 142 143