diff options
Diffstat (limited to 'include/linux/adfs_fs.h')
| -rw-r--r-- | include/linux/adfs_fs.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/include/linux/adfs_fs.h b/include/linux/adfs_fs.h new file mode 100644 index 00000000..b19801f7 --- /dev/null +++ b/include/linux/adfs_fs.h @@ -0,0 +1,63 @@ +#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 |