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Amiga Magazin: Amiga-CD 1996 March
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Amiga-CD 1996 #3.iso
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amiga_technologies
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include_i
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dos
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filehandler.i
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1996-01-19
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IFND DOS_FILEHANDLER_I
DOS_FILEHANDLER_I SET 1
**
** $VER: filehandler.i 36.5 (9.8.92)
** Includes Release 40.16
**
** device and file handler specific code for AmigaDOS
**
** (C) Copyright 1986-1995 ESCOM AG
** All Rights Reserved
**
IFND EXEC_TYPES_I
INCLUDE "exec/types.i"
ENDC ; EXEC_TYPES_I
IFND EXEC_PORTS_I
INCLUDE "exec/ports.i"
ENDC ; EXEC_PORTS_I
IFND DOS_DOS_I
INCLUDE "libraries/dos.i"
ENDC ; DOS_DOS_I
* The disk "environment" is a longword array that describes the
* disk geometry. It is variable sized, with the length at the beginning.
* Here are the constants for a standard geometry.
STRUCTURE DosEnvec,0
ULONG de_TableSize ; Size of Environment vector
ULONG de_SizeBlock ; in longwords: standard value is 128
ULONG de_SecOrg ; not used; must be 0
ULONG de_Surfaces ; # of heads (surfaces). drive specific
ULONG de_SectorPerBlock ; not used; must be 1
ULONG de_BlocksPerTrack ; blocks per track. drive specific
ULONG de_Reserved ; DOS reserved blocks at start of partition.
ULONG de_PreAlloc ; DOS reserved blocks at end of partition
ULONG de_Interleave ; usually 0
ULONG de_LowCyl ; starting cylinder. typically 0
ULONG de_HighCyl ; max cylinder. drive specific
ULONG de_NumBuffers ; Initial # DOS of buffers.
ULONG de_BufMemType ; type of mem to allocate for buffers
ULONG de_MaxTransfer ; Max number of bytes to transfer at a time
ULONG de_Mask ; Address Mask to block out certain memory
LONG de_BootPri ; Boot priority for autoboot
ULONG de_DosType ; ASCII (HEX) string showing filesystem type;
; 0X444F5300 is old filesystem,
; 0X444F5301 is fast file system
ULONG de_Baud ; Baud rate for serial handler
ULONG de_Control ; Control word for handler/filesystem
ULONG de_BootBlocks ; Number of blocks containing boot code
LABEL DosEnvec_SIZEOF
* these are the offsets into the array
* DE_TABLESIZE is set to the number of longwords in the table minus 1
DE_TABLESIZE EQU 0 ; minimum value is 11 (includes NumBuffers)
DE_SIZEBLOCK EQU 1 ; in longwords: standard value is 128
DE_SECORG EQU 2 ; not used; must be 0
DE_NUMHEADS EQU 3 ; # of heads (surfaces). drive specific
DE_SECSPERBLK EQU 4 ; not used; must be 1
DE_BLKSPERTRACK EQU 5 ; blocks per track. drive specific
DE_RESERVEDBLKS EQU 6 ; unavailable blocks at start. usually 2
DE_PREFAC EQU 7 ; not used; must be 0
DE_INTERLEAVE EQU 8 ; usually 0
DE_LOWCYL EQU 9 ; starting cylinder. typically 0
DE_UPPERCYL EQU 10 ; max cylinder. drive specific
DE_NUMBUFFERS EQU 11 ; starting # of buffers. typically 5
DE_MEMBUFTYPE EQU 12 ; type of mem to allocate for buffers.
DE_BUFMEMTYPE EQU 12 ; same as above, better name
; 1 is public, 3 is chip, 5 is fast
DE_MAXTRANSFER EQU 13 ; Maximum number of bytes to transfer at a time
DE_MASK EQU 14 ; Address Mask to block out certain memory
DE_BOOTPRI EQU 15 ; Boot priority for autoboot
DE_DOSTYPE EQU 16 ; ASCII (HEX) string showing filesystem type
; 0X444F5300 is old filesystem,
; 0X444F5301 is fast file system
DE_BAUD EQU 17 ; Baud rate for serial handler
DE_CONTROL EQU 18 ; Control word for handler/filesystem
DE_BOOTBLOCKS EQU 19 ; Number of blocks containing boot code
*
* The file system startup message is linked into a device node's startup
* field. It contains a pointer to the above environment, plus the
* information needed to do an exec OpenDevice().
*
STRUCTURE FileSysStartupMsg,0
ULONG fssm_Unit ; exec unit number for this device
BSTR fssm_Device ; null terminated bstring to the device name
BPTR fssm_Environ ; ptr to environment table (see above)
ULONG fssm_Flags ; flags for OpenDevice()
LABEL FileSysStartupMsg_SIZEOF
* The include file "libraries/dosextens.h" has a DeviceList structure.
* The "device list" can have one of three different things linked onto
* it. Dosextens defines the structure for a volume. DLT_DIRECTORY
* is for an assigned directory. The following structure is for
* a dos "device" (DLT_DEVICE).
STRUCTURE DeviceNode,0
BPTR dn_Next ; singly linked list
ULONG dn_Type ; always 0 for dos "devices"
CPTR dn_Task ; standard dos "task" field. If this is
; null when the node is accesses, a task
; will be started up
BPTR dn_Lock ; not used for devices -- leave null
BSTR dn_Handler ; filename to loadseg (if seglist is null)
ULONG dn_StackSize ; stacksize to use when starting task
LONG dn_Priority ; task priority when starting task
BPTR dn_Startup ; startup msg: FileSysStartupMsg for disks
BPTR dn_SegList ; code to run to start new task (if necessary).
; if null then dn_Handler will be loaded.
BPTR dn_GlobalVec ; BCPL global vector to use when starting
; a task. -1 means that dn_SegList is not
; for a bcpl program, so the dos won't
; try and construct one. 0 tell the
; dos that you obey BCPL linkage rules,
; and that it should construct a global
; vector for you.
BSTR dn_Name ; the node name, e.g. '\3','D','F','3'
LABEL DeviceNode_SIZEOF
ENDC ; DOS_FILEHANDLER_I