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