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1.1 root 1: /*
2: * GRUB -- GRand Unified Bootloader
3: * Copyright (C) 2001 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 2 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, write to the Free Software
17: * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
18: * MA 02110-1301, USA.
19: */
20:
21:
22: /*
23: * Defines for the FAT BIOS Parameter Block (embedded in the first block
24: * of the partition.
25: */
26:
27: typedef __signed__ char __s8;
28: typedef unsigned char __u8;
29: typedef __signed__ short __s16;
30: typedef unsigned short __u16;
31: typedef __signed__ int __s32;
32: typedef unsigned int __u32;
33:
34: /* Note that some shorts are not aligned, and must therefore
35: * be declared as array of two bytes.
36: */
37: struct fat_bpb {
38: __s8 ignored[3]; /* Boot strap short or near jump */
39: __s8 system_id[8]; /* Name - can be used to special case
40: partition manager volumes */
41: __u16 bytes_per_sect; /* bytes per logical sector */
42: __u8 sects_per_clust;/* sectors/cluster */
43: __u16 reserved_sects; /* reserved sectors */
44: __u8 num_fats; /* number of FATs */
45: __u16 dir_entries; /* root directory entries */
46: __u16 short_sectors; /* number of sectors */
47: __u8 media; /* media code (unused) */
48: __u16 fat_length; /* sectors/FAT */
49: __u16 secs_track; /* sectors per track */
50: __u16 heads; /* number of heads */
51: __u32 hidden; /* hidden sectors (unused) */
52: __u32 long_sectors; /* number of sectors (if short_sectors == 0) */
53:
54: /* The following fields are only used by FAT32 */
55: __u32 fat32_length; /* sectors/FAT */
56: __u16 flags; /* bit 8: fat mirroring, low 4: active fat */
57: __u16 version; /* major, minor filesystem version */
58: __u32 root_cluster; /* first cluster in root directory */
59: __u16 info_sector; /* filesystem info sector */
60: __u16 backup_boot; /* backup boot sector */
61: __u16 reserved2[6]; /* Unused */
62: } __attribute__ ((packed));
63:
64: /*
65: * Defines how to differentiate a 12-bit and 16-bit FAT.
66: */
67:
68: #define FAT_MAX_12BIT_CLUST 4087 /* 4085 + 2 */
69:
70: /*
71: * Defines for the file "attribute" byte
72: */
73:
74: #define FAT_ATTRIB_OK_MASK 0x37
75: #define FAT_ATTRIB_NOT_OK_MASK 0xC8
76: #define FAT_ATTRIB_DIR 0x10
77: #define FAT_ATTRIB_LONGNAME 0x0F
78:
79: /*
80: * Defines for FAT directory entries
81: */
82:
83: #define FAT_DIRENTRY_LENGTH 32
84:
85: #define FAT_DIRENTRY_ATTRIB(entry) \
86: (*((unsigned char *) (entry+11)))
87: #define FAT_DIRENTRY_VALID(entry) \
88: ( ((*((unsigned char *) entry)) != 0) \
89: && ((*((unsigned char *) entry)) != 0xE5) \
90: && !(FAT_DIRENTRY_ATTRIB(entry) & FAT_ATTRIB_NOT_OK_MASK) )
91: #define FAT_DIRENTRY_FIRST_CLUSTER(entry) \
92: ((*((unsigned short *) (entry+26)))+(*((unsigned short *) (entry+20)) << 16))
93: #define FAT_DIRENTRY_FILELENGTH(entry) \
94: (*((unsigned long *) (entry+28)))
95:
96: #define FAT_LONGDIR_ID(entry) \
97: (*((unsigned char *) (entry)))
98: #define FAT_LONGDIR_ALIASCHECKSUM(entry) \
99: (*((unsigned char *) (entry+13)))
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