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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ADFS_FS_H
2#define _ADFS_FS_H
3
4#include <linux/types.h>
Jeff Garzike18fa702006-09-24 11:13:19 -04005#include <linux/magic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7/*
8 * Disc Record at disc address 0xc00
9 */
10struct adfs_discrecord {
11 __u8 log2secsize;
12 __u8 secspertrack;
13 __u8 heads;
14 __u8 density;
15 __u8 idlen;
16 __u8 log2bpmb;
17 __u8 skew;
18 __u8 bootoption;
19 __u8 lowsector;
20 __u8 nzones;
21 __le16 zone_spare;
22 __le32 root;
23 __le32 disc_size;
24 __le16 disc_id;
25 __u8 disc_name[10];
26 __le32 disc_type;
27 __le32 disc_size_high;
28 __u8 log2sharesize:4;
29 __u8 unused40:4;
30 __u8 big_flag:1;
31 __u8 unused41:1;
32 __u8 nzones_high;
33 __le32 format_version;
34 __le32 root_size;
35 __u8 unused52[60 - 52];
36};
37
38#define ADFS_DISCRECORD (0xc00)
39#define ADFS_DR_OFFSET (0x1c0)
40#define ADFS_DR_SIZE 60
41#define ADFS_DR_SIZE_BITS (ADFS_DR_SIZE << 3)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43#ifdef __KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -070044/*
45 * Calculate the boot block checksum on an ADFS drive. Note that this will
46 * appear to be correct if the sector contains all zeros, so also check that
47 * the disk size is non-zero!!!
48 */
49static inline int adfs_checkbblk(unsigned char *ptr)
50{
51 unsigned int result = 0;
52 unsigned char *p = ptr + 511;
53
54 do {
55 result = (result & 0xff) + (result >> 8);
56 result = result + *--p;
57 } while (p != ptr);
58
59 return (result & 0xff) != ptr[511];
60}
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#endif
62
63#endif