1 #ifndef _ADFS_FS_H
2 #define _ADFS_FS_H
3
4 #include <linux/types.h>
5
6 /*
7 * Disc Record at disc address 0xc00
8 */
9 struct adfs_discrecord {
10 __u8 log2secsize;
11 __u8 secspertrack;
12 __u8 heads;
13 __u8 density;
14 __u8 idlen;
15 __u8 log2bpmb;
16 __u8 skew;
17 __u8 bootoption;
18 __u8 lowsector;
19 __u8 nzones;
20 __u16 zone_spare;
21 __u32 root;
22 __u32 disc_size;
23 __u16 disc_id;
24 __u8 disc_name[10];
25 __u32 disc_type;
26 __u32 disc_size_high;
27 __u8 log2sharesize:4;
28 __u8 unused40:4;
29 __u8 big_flag:1;
30 __u8 unused41:1;
31 __u8 nzones_high;
32 __u32 format_version;
33 __u32 root_size;
34 __u8 unused52[60 - 52];
35 };
36
37 #define ADFS_DISCRECORD (0xc00)
38 #define ADFS_DR_OFFSET (0x1c0)
39 #define ADFS_DR_SIZE 60
40 #define ADFS_DR_SIZE_BITS (ADFS_DR_SIZE << 3)
41 #define ADFS_SUPER_MAGIC 0xadf5
42
43 #ifdef __KERNEL__
44 /*
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 */
49 static 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 }
61
62 #endif
63
64 #endif
65
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