mirror of https://github.com/artizirk/dvhtool.git
163 lines
7.0 KiB
C
163 lines
7.0 KiB
C
#ifndef _SYS_DVH_H
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#define _SYS_DVH_H
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/*
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* Format for volume header information
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*
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* The volume header is a block located at the beginning of all disk
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* media (sector 0). It contains information pertaining to physical
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* device parameters and logical partition information.
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*
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* The volume header is manipulated by disk formatters/verifiers,
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* partition builders (e.g. fx, dvhtool, and mkfs), and disk drivers.
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*
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* Previous versions of IRIX wrote a copy of the volume header is
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* located at sector 0 of each track of cylinder 0. These copies were
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* never used, and reduced the capacity of the volume header to hold large
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* files, so this practice was discontinued.
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* The volume header is constrained to be less than or equal to 512
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* bytes long. A particular copy is assumed valid if no drive errors
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* are detected, the magic number is correct, and the 32 bit 2's complement
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* of the volume header is correct. The checksum is calculated by initially
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* zeroing vh_csum, summing the entire structure and then storing the
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* 2's complement of the sum. Thus a checksum to verify the volume header
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* should be 0.
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*
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* The error summary table, bad sector replacement table, and boot blocks are
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* located by searching the volume directory within the volume header.
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*
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* Tables are sized simply by the integral number of table records that
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* will fit in the space indicated by the directory entry.
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*
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* The amount of space allocated to the volume header, replacement blocks,
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* and other tables is user defined when the device is formatted.
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*/
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/*
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* device parameters are in the volume header to determine mapping
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* from logical block numbers to physical device addresses
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*
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* Linux doesn't care ...
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*/
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struct device_parameters {
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unsigned char dp_skew; /* spiral addressing skew */
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unsigned char dp_gap1; /* words of 0 before header */
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unsigned char dp_gap2; /* words of 0 between hdr and data */
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unsigned char dp_spares_cyl; /* This is for drives (such as SCSI
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that support zone oriented sparing, where the zone is larger
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than one track. It gets subracteded from the cylinder size
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( dp_trks0 * dp_sec) when doing partition size calculations */
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unsigned short dp_cyls; /* number of usable cylinders (i.e.,
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doesn't include cylinders reserved by the drive for badblocks,
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etc.). For drives with variable geometry, this number may be
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decreased so that:
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dp_cyls * ((dp_heads * dp_trks0) - dp_spares_cyl) <= actualcapacity
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This happens on SCSI drives such as the Wren IV and Toshiba 156
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Also see dp_cylshi below */
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unsigned short dp_shd0; /* starting head vol 0 */
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unsigned short dp_trks0; /* number of tracks / cylinder vol 0*/
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unsigned char dp_ctq_depth; /* Depth of CTQ queue */
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unsigned char dp_cylshi; /* high byte of 24 bits of cylinder count */
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unsigned short dp_unused; /* not used */
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unsigned short dp_secs; /* number of sectors/track */
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unsigned short dp_secbytes; /* length of sector in bytes */
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unsigned short dp_interleave; /* sector interleave */
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int dp_flags; /* controller characteristics */
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int dp_datarate; /* bytes/sec for kernel stats */
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int dp_nretries; /* max num retries on data error */
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int dp_mspw; /* ms per word to xfer, for iostat */
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unsigned short dp_xgap1; /* Gap 1 for xylogics controllers */
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unsigned short dp_xsync; /* sync delay for xylogics controllers */
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unsigned short dp_xrdly; /* read delay for xylogics controllers */
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unsigned short dp_xgap2; /* gap 2 for xylogics controllers */
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unsigned short dp_xrgate; /* read gate for xylogics controllers */
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unsigned short dp_xwcont; /* write continuation for xylogics */
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};
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/*
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* Device characterization flags
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* (dp_flags)
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*/
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#define DP_SECTSLIP 0x00000001 /* sector slip to spare sector */
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#define DP_SECTFWD 0x00000002 /* forward to replacement sector */
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#define DP_TRKFWD 0x00000004 /* forward to replacement track */
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#define DP_MULTIVOL 0x00000008 /* multiple volumes per spindle */
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#define DP_IGNOREERRORS 0x00000010 /* transfer data regardless of errors */
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#define DP_RESEEK 0x00000020 /* recalibrate as last resort */
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#define DP_CTQ_EN 0x00000040 /* enable command tag queueing */
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/*
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* Boot blocks, bad sector tables, and the error summary table, are located
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* via the volume_directory.
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*/
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#define VDNAMESIZE 8
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struct volume_directory {
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char vd_name[VDNAMESIZE]; /* name */
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int vd_lbn; /* logical block number */
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int vd_nbytes; /* file length in bytes */
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};
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/*
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* partition table describes logical device partitions
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* (device drivers examine this to determine mapping from logical units
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* to cylinder groups, device formatters/verifiers examine this to determine
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* location of replacement tracks/sectors, etc)
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*
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* NOTE: pt_firstlbn SHOULD BE CYLINDER ALIGNED
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*/
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struct partition_table { /* one per logical partition */
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int pt_nblks; /* # of logical blks in partition */
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int pt_firstlbn; /* first lbn of partition */
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int pt_type; /* use of partition */
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};
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#define PTYPE_VOLHDR 0 /* partition is volume header */
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#define PTYPE_TRKREPL 1 /* partition is used for repl trks */
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#define PTYPE_SECREPL 2 /* partition is used for repl secs */
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#define PTYPE_RAW 3 /* partition is used for data */
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#define PTYPE_BSD42 4 /* partition is 4.2BSD file system */
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#define PTYPE_BSD 4 /* partition is 4.2BSD file system */
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#define PTYPE_SYSV 5 /* partition is SysV file system */
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#define PTYPE_VOLUME 6 /* partition is entire volume */
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#define PTYPE_EFS 7 /* partition is sgi EFS */
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#define PTYPE_LVOL 8 /* partition is part of a logical vol */
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#define PTYPE_RLVOL 9 /* part of a "raw" logical vol */
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#define PTYPE_XFS 10 /* partition is sgi XFS */
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#define PTYPE_XFSLOG 11 /* partition is sgi XFS log */
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#define PTYPE_XLV 12 /* partition is part of an XLV vol */
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#define PTYPE_XVM 13 /* partition is sgi XVM */
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#define PTYPE_LSWAP 0x82 /* partition is Linux swap */
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#define PTYPE_LINUX 0x83 /* partition is Linux native */
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#define NPTYPES 16
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#define VHMAGIC 0xbe5a941 /* randomly chosen value */
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#define NPARTAB 16 /* 16 unix partitions */
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#define NVDIR 15 /* max of 15 directory entries */
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#define BFNAMESIZE 16 /* max 16 chars in boot file name */
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/* Partition types for ARCS */
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#define NOT_USED 0 /* Not used */
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#define FAT_SHORT 1 /* FAT filesystem, 12-bit FAT entries */
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#define FAT_LONG 4 /* FAT filesystem, 16-bit FAT entries */
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#define EXTENDED 5 /* extended partition */
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#define HUGE 6 /* huge partition- MS/DOS 4.0 and later */
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/* Active flags for ARCS */
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#define BOOTABLE 0x00;
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#define NOT_BOOTABLE 0x80;
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struct volume_header {
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int vh_magic; /* identifies volume header */
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short vh_rootpt; /* root partition number */
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short vh_swappt; /* swap partition number */
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char vh_bootfile[BFNAMESIZE]; /* name of file to boot */
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struct device_parameters vh_dp; /* device parameters */
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struct volume_directory vh_vd[NVDIR]; /* other vol hdr contents */
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struct partition_table vh_pt[NPARTAB]; /* device partition layout */
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int vh_csum; /* volume header checksum */
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int vh_fill; /* fill out to 512 bytes */
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};
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#endif /* _SYS_DVH_H */
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