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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/include/linux/adfs_fs.h
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#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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