1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 #ifndef _ADFS_FS_H 1 #ifndef _ADFS_FS_H
3 #define _ADFS_FS_H 2 #define _ADFS_FS_H
4 3
5 #include <uapi/linux/adfs_fs.h> !! 4 #include <linux/types.h>
6 5
7 /* 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 /*
8 * Calculate the boot block checksum on an ADF 45 * Calculate the boot block checksum on an ADFS drive. Note that this will
9 * appear to be correct if the sector contains 46 * appear to be correct if the sector contains all zeros, so also check that
10 * the disk size is non-zero!!! 47 * the disk size is non-zero!!!
11 */ 48 */
12 static inline int adfs_checkbblk(unsigned char 49 static inline int adfs_checkbblk(unsigned char *ptr)
13 { 50 {
14 unsigned int result = 0; 51 unsigned int result = 0;
15 unsigned char *p = ptr + 511; 52 unsigned char *p = ptr + 511;
16 53
17 do { 54 do {
18 result = (result & 0xff) + (re 55 result = (result & 0xff) + (result >> 8);
19 result = result + *--p; 56 result = result + *--p;
20 } while (p != ptr); 57 } while (p != ptr);
21 58
22 return (result & 0xff) != ptr[511]; 59 return (result & 0xff) != ptr[511];
23 } 60 }
>> 61
>> 62 #endif
>> 63
24 #endif 64 #endif
25 65
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