| /* |
| libparted |
| Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc. |
| |
| This program 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 2 of the License, or |
| (at your option) any later version. |
| |
| This program 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 this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA |
| */ |
| |
| #ifndef PED_FAT_BOOTSECTOR_H |
| #define PED_FAT_BOOTSECTOR_H |
| |
| typedef struct _FatBootSector FatBootSector; |
| typedef struct _FatInfoSector FatInfoSector; |
| |
| #include "fat.h" |
| |
| #define FAT32_INFO_MAGIC1 0x41615252 |
| #define FAT32_INFO_MAGIC2 0x61417272 |
| #define FAT32_INFO_MAGIC3 0xaa55 |
| |
| /* stolen from mkdosfs, by Dave Hudson */ |
| |
| #define FAT_BOOT_MESSAGE \ |
| "This partition does not have an operating system loader installed on it.\n\r"\ |
| "Press a key to reboot..." |
| |
| #define FAT_BOOT_JUMP "\xeb\x58\x90" /* jmp +5a */ |
| |
| #define FAT_BOOT_CODE "\x0e" /* push cs */ \ |
| "\x1f" /* pop ds */ \ |
| "\xbe\x74\x7e" /* mov si, offset message */ \ |
| /* write_msg_loop: */ \ |
| "\xac" /* lodsb */ \ |
| "\x22\xc0" /* and al, al */ \ |
| "\x74\x06" /* jz done (+8) */ \ |
| "\xb4\x0e" /* mov ah, 0x0e */ \ |
| "\xcd\x10" /* int 0x10 */ \ |
| "\xeb\xf5" /* jmp write_msg_loop */ \ |
| /* done: */ \ |
| "\xb4\x00" /* mov ah, 0x00 */ \ |
| "\xcd\x16" /* int 0x16 */ \ |
| "\xb4\x00" /* mov ah, 0x00 */ \ |
| "\xcd\x19" /* int 0x19 */ \ |
| "\xeb\xfe" /* jmp +0 - in case int 0x19 */ \ |
| /* doesn't work */ \ |
| /* message: */ \ |
| FAT_BOOT_MESSAGE |
| |
| #define FAT_BOOT_CODE_LENGTH 128 |
| |
| struct __attribute__ ((packed)) _FatBootSector { |
| uint8_t boot_jump[3]; /* 00: Boot strap short or near jump */ |
| uint8_t system_id[8]; /* 03: system name */ |
| uint16_t sector_size; /* 0b: bytes per logical sector */ |
| uint8_t cluster_size; /* 0d: sectors/cluster */ |
| uint16_t reserved; /* 0e: reserved sectors */ |
| uint8_t fats; /* 10: number of FATs */ |
| uint16_t dir_entries; /* 11: number of root directory entries */ |
| uint16_t sectors; /* 13: if 0, total_sect supersedes */ |
| uint8_t media; /* 15: media code */ |
| uint16_t fat_length; /* 16: sectors/FAT for FAT12/16 */ |
| uint16_t secs_track; /* 18: sectors per track */ |
| uint16_t heads; /* 1a: number of heads */ |
| uint32_t hidden; /* 1c: hidden sectors (partition start) */ |
| uint32_t sector_count; /* 20: no. of sectors (if sectors == 0) */ |
| |
| union __attribute__ ((packed)) { |
| /* FAT16 fields */ |
| struct __attribute__ ((packed)) { |
| uint8_t drive_num; /* 24: */ |
| uint8_t empty_1; /* 25: */ |
| uint8_t ext_signature; /* 26: always 0x29 */ |
| uint32_t serial_number; /* 27: */ |
| uint8_t volume_name [11]; /* 2b: */ |
| uint8_t fat_name [8]; /* 36: */ |
| uint8_t boot_code[448]; /* 3f: Boot code (or message) */ |
| } fat16; |
| /* FAT32 fields */ |
| struct __attribute__ ((packed)) { |
| uint32_t fat_length; /* 24: size of FAT in sectors */ |
| uint16_t flags; /* 28: bit8: fat mirroring, low4: active fat */ |
| uint16_t version; /* 2a: minor * 256 + major */ |
| uint32_t root_dir_cluster; /* 2c: */ |
| uint16_t info_sector; /* 30: */ |
| uint16_t backup_sector; /* 32: */ |
| uint8_t empty_1 [12]; /* 34: */ |
| uint16_t drive_num; /* 40: */ |
| uint8_t ext_signature; /* 42: always 0x29 */ |
| uint32_t serial_number; /* 43: */ |
| uint8_t volume_name [11]; /* 47: */ |
| uint8_t fat_name [8]; /* 52: */ |
| uint8_t boot_code[420]; /* 5a: Boot code (or message) */ |
| } fat32; |
| } u; |
| |
| uint16_t boot_sign; /* 1fe: always 0xAA55 */ |
| }; |
| |
| struct __attribute__ ((packed)) _FatInfoSector { |
| uint32_t signature_1; /* should be 0x41615252 */ |
| uint8_t unused [480]; |
| uint32_t signature_2; /* should be 0x61417272 */ |
| uint32_t free_clusters; |
| uint32_t next_cluster; /* most recently allocated cluster */ |
| uint8_t unused2 [0xe]; |
| uint16_t signature_3; /* should be 0xaa55 */ |
| }; |
| |
| int fat_boot_sector_read (FatBootSector* bs, const PedGeometry* geom); |
| FatType fat_boot_sector_probe_type (const FatBootSector* bs, |
| const PedGeometry* geom); |
| int fat_boot_sector_analyse (FatBootSector* bs, PedFileSystem* fs); |
| int fat_boot_sector_set_boot_code (FatBootSector* bs); |
| int fat_boot_sector_generate (FatBootSector* bs, const PedFileSystem* fs); |
| int fat_boot_sector_write (const FatBootSector* bs, PedFileSystem* fs); |
| |
| int fat_info_sector_read (FatInfoSector* is, const PedFileSystem* fs); |
| int fat_info_sector_generate (FatInfoSector* is, const PedFileSystem* fs); |
| int fat_info_sector_write (const FatInfoSector* is, PedFileSystem* fs); |
| |
| #endif /* PED_FAT_BOOTSECTOR_H */ |
| |