63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
#ifndef _ADFS_FS_H
|
|
#define _ADFS_FS_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/magic.h>
|
|
|
|
/*
|
|
* Disc Record at disc address 0xc00
|
|
*/
|
|
struct adfs_discrecord {
|
|
__u8 log2secsize;
|
|
__u8 secspertrack;
|
|
__u8 heads;
|
|
__u8 density;
|
|
__u8 idlen;
|
|
__u8 log2bpmb;
|
|
__u8 skew;
|
|
__u8 bootoption;
|
|
__u8 lowsector;
|
|
__u8 nzones;
|
|
__le16 zone_spare;
|
|
__le32 root;
|
|
__le32 disc_size;
|
|
__le16 disc_id;
|
|
__u8 disc_name[10];
|
|
__le32 disc_type;
|
|
__le32 disc_size_high;
|
|
__u8 log2sharesize:4;
|
|
__u8 unused40:4;
|
|
__u8 big_flag:1;
|
|
__u8 unused41:1;
|
|
__u8 nzones_high;
|
|
__le32 format_version;
|
|
__le32 root_size;
|
|
__u8 unused52[60 - 52];
|
|
};
|
|
|
|
#define ADFS_DISCRECORD (0xc00)
|
|
#define ADFS_DR_OFFSET (0x1c0)
|
|
#define ADFS_DR_SIZE 60
|
|
#define ADFS_DR_SIZE_BITS (ADFS_DR_SIZE << 3)
|
|
|
|
#ifdef __KERNEL__
|
|
/*
|
|
* Calculate the boot block checksum on an ADFS drive. Note that this will
|
|
* appear to be correct if the sector contains all zeros, so also check that
|
|
* the disk size is non-zero!!!
|
|
*/
|
|
static inline int adfs_checkbblk(unsigned char *ptr)
|
|
{
|
|
unsigned int result = 0;
|
|
unsigned char *p = ptr + 511;
|
|
|
|
do {
|
|
result = (result & 0xff) + (result >> 8);
|
|
result = result + *--p;
|
|
} while (p != ptr);
|
|
|
|
return (result & 0xff) != ptr[511];
|
|
}
|
|
#endif
|
|
|
|
#endif
|