dvdrdata.inc

MMURTL(tm) Computer Operating System Ver x0.8, source code.

;   MMURTL Operating System Source Code
;   Copyright 1991,1992,1993, Richard A. Burgess
;   ALL RIGHTS RESERVED
;   Version x0.8

;These are the Equates and data for the device driver entry and exit code.

nDevices		EQU	24		;Number of Device Control Blocks

;Device Control Block.  This structure defines the DCB layout for all
;device drivers.  Each driver is responsible for creating and initially
;setting up a DCB prior to calling InitDevDr.  The OS maintains an array
;of pointers to the device drivers.  The physical device number
;(0-nDevices) is determined by the position in the array. An array
;position that contains a NULL pointer indicates a device is not installed.
;For instance, if the first pointer in the rgpDCBs is NULL, device "0"
;is not available. The DCB also maintains a 12 byte name for the device
;which the installer specifies.  A PUBLIC call is provided to translate
;the name to a device number so callers and services can find the
;physical number from the name.
;The name of a device is case aware but NOT case sensitive
;
; The DCB structure layout follows:
;
sDevCB		EQU 64		;size of the Device Control Block
DevCBType	STRUC		;Block Device Control block

DevName		DB 12 DUP (0)	;Device Name
sbDevName	DB 0		;Length of Devname
DevType		DB 0		;1 = RANDOM, 2 = SEQUENTIAL, 0 = No Device
nBPB		DW 0		;Bytes per Block (1 to 65535 max)
LastDevErc	DD 0		;Last error code from an operation
nDevBlocks	DD 0		;Number of blocks in device (0 for sequential)
			;24
pDevOp		DD 0		;Offset to device Operation handler
pDevInit	DD 0		;Offset to device Init handler
pDevSt		DD 0		;Offset to device Status handler
			;36
fDevReent	DB 0		;Is device handler reentrant?
fSingleUser	DB 0		;Is device assignable?
wJob		DW 0		;If assignable, is it? (0 for no, else Job Num)
DevSemExch	DD 0		;Exch for device semaphore (if not reentrant)
DevSemMsg	DD 0		;Msg holder for msg from WAIT on queued Tasks
DevSemMsg1	DD 0		;Msg holder (second DWord)
			;52
DevRsvd	DB 12 DUP(0)	;Reserved out to 64 bytes
DevCBType	ENDS

rgpDCBs		DD nDevices DUP (0)		;
rgReDIR		DD nDevices DUP (0)		;For redirection of devices

;Standard Devices are:

;#		Device					Standard name

;0		NULL device 			NUL		(OS built-in)
;1		Keyboard (sequential)	KBD		(OS built-in, ReadOnly)
;2		Video (sequential)		VID		(OS built-in, WriteOnly)
;3		Printer (parallel 1)	LPT1	(OS built-in)
;4		Printer (parallel 2)	LPT2	(OS built-in)
;5		RS-232 1				COM1	(OS built-in)
;6		RS-232 2				COM2	(OS built-in)
;7		RS-232 3				COM3	(OS built-in)
;8		RS-232 4				COM4	(OS built-in)
;9
;10		Floppy					FD0 	(OS built-in)
;11		Floppy					FD1 	(OS built-in)
;12		Hard disk				HD0 	(OS built-in)
;13		Hard disk				HD1 	(OS built-in)
;14
;15
;16
;17
;18
;19
;20
;21
;22
;23