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- (*-------------------------------------------------------------------------*)
- (* *)
- (* Amiga Oberon Interface Module: Date: 02-Nov-92 *)
- (* *)
- (* © 1992 by Fridtjof Siebert *)
- (* *)
- (*-------------------------------------------------------------------------*)
-
- MODULE HardBlocks;
-
- IMPORT e * := Exec,
- sys * := SYSTEM;
-
- (*--------------------------------------------------------------------
- *
- * This file describes blocks of data that exist on a hard disk
- * to describe that disk. They are not generically accessable to
- * the user as they do not appear on any DOS drive. The blocks
- * are tagged with a unique identifier, checksummed, and linked
- * together. The root of these blocks is the RigidDiskBlock.
- *
- * The RigidDiskBlock must exist on the disk within the first
- * RDB_LOCATION_LIMIT blocks. This inhibits the use of the zero
- * cylinder in an AmigaDOS partition: although it is strictly
- * possible to store the RigidDiskBlock data in the reserved
- * area of a partition, this practice is discouraged since the
- * reserved blocks of a partition are overwritten by "Format",
- * "Install", "DiskCopy", etc. The recommended disk layout,
- * then, is to use the first cylinder(s) to store all the drive
- * data specified by these blocks: i.e. partition descriptions,
- * file system load images, drive bad block maps, spare blocks,
- * etc.
- *
- * Though only 512 byte blocks are currently supported by the
- * file system, this proposal tries to be forward-looking by
- * making the block size explicit, and by using only the first
- * 256 bytes for all blocks but the LoadSeg data.
- *
- *------------------------------------------------------------------*)
-
- TYPE
-
- (*
- * NOTE
- * optional block addresses below contain -1 to indicate
- * a NULL address, as zero is a valid address
- *)
-
- RigidDiskBlockPtr * = UNTRACED POINTER TO RigidDiskBlock;
- RigidDiskBlock * = STRUCT
- id * : LONGINT; (* 4 character identifier *)
- summedLongs * : LONGINT; (* size of this checksummed structure *)
- chkSum * : LONGINT; (* block checksum (longword sum to zero) *)
- hostID * : LONGINT; (* SCSI Target ID of host *)
- blockBytes * : LONGINT; (* size of disk blocks *)
- flags * : LONGSET; (* see below for defines *)
- (* block list heads *)
- badBlockList * : LONGINT; (* optional bad block list *)
- partitionList * : LONGINT; (* optional first partition block *)
- fileSysHeaderList * : LONGINT; (* optional file system header block *)
- driveInit * : LONGINT; (* optional drive-specific init code *)
- (* DriveInit(lun,rdb,ior): "C" stk & d0/a0/a1 *)
- reserved1 * : ARRAY 6 OF LONGINT; (* set to -1 *)
- (* physical drive characteristics *)
- cylinders * : LONGINT; (* number of drive cylinders *)
- sectors * : LONGINT; (* sectors per track *)
- heads * : LONGINT; (* number of drive heads *)
- interleave * : LONGINT; (* interleave *)
- park * : LONGINT; (* landing zone cylinder *)
- reserved2 * : ARRAY 3 OF LONGINT;
- writePreComp * : LONGINT; (* starting cylinder: write precompensation *)
- reducedWrite * : LONGINT; (* starting cylinder: reduced write current *)
- stepRate * : LONGINT; (* drive step rate *)
- reserved3 * : ARRAY 5 OF LONGINT;
- (* logical drive characteristics *)
- rdbBlocksLo * : LONGINT; (* low block of range reserved for hardblocks *)
- rdbBlocksHi * : LONGINT; (* high block of range for these hardblocks *)
- loCylinder * : LONGINT; (* low cylinder of partitionable disk area *)
- hiCylinder * : LONGINT; (* high cylinder of partitionable data area *)
- cylBlocks * : LONGINT; (* number of blocks available per cylinder *)
- autoParkSeconds * : LONGINT; (* zero for no auto park *)
- reserved4 * : ARRAY 2 OF LONGINT;
- (* drive identification *)
- diskVendor * : ARRAY 8 OF CHAR;
- diskProduct * : ARRAY 16 OF CHAR;
- diskRevision * : ARRAY 4 OF CHAR;
- controllerVendor * : ARRAY 8 OF CHAR;
- controllerProduct * : ARRAY 16 OF CHAR;
- controllerRevision * : ARRAY 4 OF CHAR;
- reserved5 * : ARRAY 10 OF LONGINT;
- END;
-
- CONST
-
- idNameRigidDisk * = sys.VAL(LONGINT,"RDSK");
-
- locationLimit * = 16;
-
- last * = 0; (* no disks exist to be configured after *)
- (* this one on this controller *)
- lastLun * = 1; (* no LUNs exist to be configured greater *)
- (* than this one at this SCSI Target ID *)
- lsatTID * = 2; (* no Target IDs exist to be configured *)
- (* greater than this one on this SCSI bus *)
- noReselect * = 3; (* don't bother trying to perform reselection *)
- (* when talking to this drive *)
- diskID * = 4; (* rdb_Disk... identification valid *)
- ctrlrID * = 5; (* rdb_Controller... identification valid *)
-
- TYPE
-
- (*------------------------------------------------------------------*)
- BadBlockEntryPtr * = UNTRACED POINTER TO BadBlockEntry;
- BadBlockEntry * = STRUCT
- badBlock * : LONGINT; (* block number of bad block *)
- goodBlock * : LONGINT; (* block number of replacement block *)
- END;
-
- BadBlockBlockPtr * = UNTRACED POINTER TO BadBlockBlock;
- BadBlockBlock * = STRUCT
- id * : LONGINT; (* 4 character identifier *)
- summedLongs * : LONGINT; (* size of this checksummed structure *)
- chkSum * : LONGINT; (* block checksum (longword sum to zero) *)
- hostID * : LONGINT; (* SCSI Target ID of host *)
- next * : LONGINT; (* block number of the next BadBlockBlock *)
- reserved * : LONGINT;
- blockPairs * : ARRAY 61 OF BadBlockEntry; (* bad block entry pairs *)
- (* note [61] assumes 512 byte blocks *)
- END;
-
- CONST
-
- idNameBadBlock * = sys.VAL(LONGINT,"BADB");
-
- TYPE
-
- (*------------------------------------------------------------------*)
-
- PartitionBlockPtr * = UNTRACED POINTER TO PartitionBlock;
- PartitionBlock * = STRUCT
- id * : LONGINT; (* 4 character identifier *)
- summedLongs * : LONGINT; (* size of this checksummed structure *)
- chkSum * : LONGINT; (* block checksum (longword sum to zero) *)
- hostID * : LONGINT; (* SCSI Target ID of host *)
- next * : LONGINT; (* block number of the next PartitionBlock *)
- flags * : LONGSET; (* see below for defines *)
- reserved1 * : ARRAY 2 OF LONGINT;
- devFlags * : LONGINT; (* preferred flags for OpenDevice *)
- driveName * : ARRAY 32 OF CHAR; (* preferred DOS device name: BSTR form *)
- (* (not used if this name is in use) *)
- reserved2 * : ARRAY 15 OF LONGINT; (* filler to 32 longwords *)
- environment * : ARRAY 17 OF LONGINT; (* environment vector for this partition *)
- eReserved * : ARRAY 15 OF LONGINT; (* reserved for future environment vector *)
- END;
-
- CONST
-
- idNamePartition * = sys.VAL(LONGINT,"PART");
-
- bootable * = 0; (* this partition is intended to be bootable *)
- (* (expected directories and files exist) *)
- noMount * = 1; (* do not mount this partition (e.g. manually *)
- (* mounted, but space reserved here) *)
-
- TYPE
-
- (*------------------------------------------------------------------*)
-
- FileSysHeaderBlockPtr * = UNTRACED POINTER TO FileSysHeaderBlock;
- FileSysHeaderBlock * = STRUCT
- id * : LONGINT; (* 4 character identifier *)
- summedLongs * : LONGINT; (* size of this checksummed structure *)
- chkSum * : LONGINT; (* block checksum (longword sum to zero) *)
- hostID * : LONGINT; (* SCSI Target ID of host *)
- next * : LONGINT; (* block number of next FileSysHeaderBlock *)
- flags * : LONGSET; (* see below for defines *)
- reserved1 * : ARRAY 2 OF LONGINT;
- dosType * : LONGINT; (* file system description: match this with *)
- (* partition environment's DE_DOSTYPE entry *)
- version * : LONGINT; (* release version of this code *)
- patchFlags * : LONGSET; (* bits set for those of the following that *)
- (* need to be substituted into a standard *)
- (* device node for this file system: e.g. *)
- (* 0x180 to substitute SegList & GlobalVec *)
- type * : LONGINT; (* device node type: zero *)
- task * : LONGINT; (* standard dos "task" field: zero *)
- lock * : LONGINT; (* not used for devices: zero *)
- handler * : LONGINT; (* filename to loadseg: zero placeholder *)
- stackSize * : LONGINT; (* stacksize to use when starting task *)
- priority * : LONGINT; (* task priority when starting task *)
- startup * : LONGINT; (* startup msg: zero placeholder *)
- segListBlocks * : LONGINT; (* first of linked list of LoadSegBlocks: *)
- (* note that this entry requires some *)
- (* processing before substitution *)
- globalVec * : LONGINT; (* BCPL global vector when starting task *)
- reserved2 * : ARRAY 23 OF LONGINT; (* (those reserved by PatchFlags) *)
- reserved3 * : ARRAY 21 OF LONGINT;
- END;
-
- CONST
-
- idNameFileSysHeader * = sys.VAL(LONGINT,"FSHD");
-
- TYPE
-
- (*------------------------------------------------------------------*)
-
- LoadSegBlockPtr * = UNTRACED POINTER TO LoadSegBlock;
- LoadSegBlock * = STRUCT
- id * : LONGINT; (* 4 character identifier *)
- summedLongs * : LONGINT; (* size of this checksummed structure *)
- chkSum * : LONGINT; (* block checksum (longword sum to zero) *)
- hostID * : LONGINT; (* SCSI Target ID of host *)
- next * : LONGINT; (* block number of the next LoadSegBlock *)
- loadData * : ARRAY 123 OF LONGINT; (* data for "loadseg" *)
- (* note [123] assumes 512 byte blocks *)
- END;
-
- CONST
-
- idNameLoadSeg * = sys.VAL(LONGINT,'LSEG');
-
- END HardBlocks.
-
-
-