131 lines
5.4 KiB
C
Executable File
131 lines
5.4 KiB
C
Executable File
/*
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libparted
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Copyright (C) 1998-2000, 2007, 2009-2014, 2019-2023 Free Software
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Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef PED_FAT_BOOTSECTOR_H
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#define PED_FAT_BOOTSECTOR_H
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typedef struct _FatBootSector FatBootSector;
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typedef struct _FatInfoSector FatInfoSector;
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#include "fat.h"
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#define FAT32_INFO_MAGIC1 0x41615252
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#define FAT32_INFO_MAGIC2 0x61417272
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#define FAT32_INFO_MAGIC3 0xaa55
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/* stolen from mkdosfs, by Dave Hudson */
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#define FAT_BOOT_MESSAGE \
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"This partition does not have an operating system loader installed on it.\n\r"\
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"Press a key to reboot..."
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#define FAT_BOOT_JUMP "\xeb\x58\x90" /* jmp +5a */
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#define FAT_BOOT_CODE "\x0e" /* push cs */ \
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"\x1f" /* pop ds */ \
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"\xbe\x74\x7e" /* mov si, offset message */ \
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/* write_msg_loop: */ \
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"\xac" /* lodsb */ \
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"\x22\xc0" /* and al, al */ \
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"\x74\x06" /* jz done (+8) */ \
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"\xb4\x0e" /* mov ah, 0x0e */ \
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"\xcd\x10" /* int 0x10 */ \
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"\xeb\xf5" /* jmp write_msg_loop */ \
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/* done: */ \
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"\xb4\x00" /* mov ah, 0x00 */ \
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"\xcd\x16" /* int 0x16 */ \
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"\xb4\x00" /* mov ah, 0x00 */ \
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"\xcd\x19" /* int 0x19 */ \
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"\xeb\xfe" /* jmp +0 - in case int 0x19 */ \
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/* doesn't work */ \
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/* message: */ \
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FAT_BOOT_MESSAGE
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struct __attribute__ ((packed)) _FatBootSector {
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uint8_t boot_jump[3]; /* 00: Boot strap short or near jump */
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uint8_t system_id[8]; /* 03: system name */
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uint16_t sector_size; /* 0b: bytes per logical sector */
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uint8_t cluster_size; /* 0d: sectors/cluster */
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uint16_t reserved; /* 0e: reserved sectors */
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uint8_t fats; /* 10: number of FATs */
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uint16_t dir_entries; /* 11: number of root directory entries */
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uint16_t sectors; /* 13: if 0, total_sect supersedes */
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uint8_t media; /* 15: media code */
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uint16_t fat_length; /* 16: sectors/FAT for FAT12/16 */
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uint16_t secs_track; /* 18: sectors per track */
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uint16_t heads; /* 1a: number of heads */
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uint32_t hidden; /* 1c: hidden sectors (partition start) */
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uint32_t sector_count; /* 20: no. of sectors (if sectors == 0) */
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union __attribute__ ((packed)) {
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/* FAT16 fields */
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struct __attribute__ ((packed)) {
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uint8_t drive_num; /* 24: */
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uint8_t empty_1; /* 25: */
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uint8_t ext_signature; /* 26: always 0x29 */
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uint32_t serial_number; /* 27: */
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uint8_t volume_name [11]; /* 2b: */
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uint8_t fat_name [8]; /* 36: */
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uint8_t boot_code[448]; /* 3f: Boot code (or message) */
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} fat16;
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/* FAT32 fields */
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struct __attribute__ ((packed)) {
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uint32_t fat_length; /* 24: size of FAT in sectors */
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uint16_t flags; /* 28: bit8: fat mirroring, low4: active fat */
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uint16_t version; /* 2a: minor * 256 + major */
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uint32_t root_dir_cluster; /* 2c: */
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uint16_t info_sector; /* 30: */
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uint16_t backup_sector; /* 32: */
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uint8_t empty_1 [12]; /* 34: */
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uint16_t drive_num; /* 40: */
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uint8_t ext_signature; /* 42: always 0x29 */
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uint32_t serial_number; /* 43: */
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uint8_t volume_name [11]; /* 47: */
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uint8_t fat_name [8]; /* 52: */
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uint8_t boot_code[420]; /* 5a: Boot code (or message) */
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} fat32;
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} u;
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uint16_t boot_sign; /* 1fe: always 0xAA55 */
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};
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struct __attribute__ ((packed)) _FatInfoSector {
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uint32_t signature_1; /* should be 0x41615252 */
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uint8_t unused [480];
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uint32_t signature_2; /* should be 0x61417272 */
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uint32_t free_clusters;
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uint32_t next_cluster; /* most recently allocated cluster */
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uint8_t unused2 [0xe];
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uint16_t signature_3; /* should be 0xaa55 */
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};
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int fat_boot_sector_read (FatBootSector** bs, const PedGeometry* geom);
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FatType fat_boot_sector_probe_type (const FatBootSector* bs,
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const PedGeometry* geom);
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int fat_boot_sector_analyse (FatBootSector* bs, PedFileSystem* fs);
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int fat_boot_sector_set_boot_code (FatBootSector** bs, const PedFileSystem* fs);
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int fat_boot_sector_generate (FatBootSector** bs, const PedFileSystem* fs);
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int fat_boot_sector_write (const FatBootSector* bs, PedFileSystem* fs);
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int fat_info_sector_read (FatInfoSector** is, const PedFileSystem* fs);
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int fat_info_sector_generate (FatInfoSector** is, const PedFileSystem* fs);
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int fat_info_sector_write (const FatInfoSector* is, PedFileSystem* fs);
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#endif /* PED_FAT_BOOTSECTOR_H */
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