4 #include <linux/types.h>
5 #include <linux/magic.h>
8 * Disc Record at disc address 0xc00
10 struct adfs_discrecord
{
27 __le32 disc_size_high
;
33 __le32 format_version
;
35 __u8 unused52
[60 - 52];
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)
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!!!
49 static inline int adfs_checkbblk(unsigned char *ptr
)
51 unsigned int result
= 0;
52 unsigned char *p
= ptr
+ 511;
55 result
= (result
& 0xff) + (result
>> 8);
56 result
= result
+ *--p
;
59 return (result
& 0xff) != ptr
[511];
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