| #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 |
