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	TITLE	PULSAR - TAPE/DISK SUBSYSTEM LABELS PROCESSOR

;
;
;COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1975,1976,1977,1978,1979,
;1980,1981,1982,1983,1984,1985,1986,1987.  ALL RIGHTS RESERVED.
;
;     THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY  BE  USED
;     AND COPIED ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE
;     AND WITH THE INCLUSION OF THE ABOVE COPYRIGHT NOTICE.   THIS
;     SOFTWARE  OR ANY OTHER COPIES THEREOF MAY NOT BE PROVIDED OR
;     OTHERWISE MADE AVAILABLE TO ANY OTHER PERSON.  NO  TITLE  TO
;     AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.
;
;     THE INFORMATION  IN  THIS  SOFTWARE  IS  SUBJECT  TO  CHANGE
;     WITHOUT  NOTICE  AND SHOULD NOT BE CONSTRUED AS A COMMITMENT
;     BY DIGITAL EQUIPMENT CORPORATION.
;
;     DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY
;     OF  ITS  SOFTWARE  ON  EQUIPMENT  WHICH  IS  NOT SUPPLIED BY
;     DIGITAL.

	SEARCH	GLXMAC			;Search the library universal
	SEARCH	PLRMAC			;SEARCH UNIVERSAL FILE
	SEARCH	QSRMAC			;For the dialogue symbols
	SEARCH	ORNMAC			;And we talk to OPR a little, too
	PROLOG	(PULSAR)		;SEARCH OTHER UNIVERSALS

	PLRVSN==<VRSN.(PLR)>		;GEN VERSION NUMBER

	LOC	137
	EXP	PLRVSN			;SAVE/SET IT
	RELOC	0

	LOC	124			;GET REENTER ADDRESS
	EXP	G$REST			;SET IT
	RELOC	0			;REPHASE US

COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1971,1987.
ALL RIGHTS RESERVED.
\;END COPYRIGHT MACRO

;THIS IS THE MAIN PROGRAM FOR THE TAPE LABELLER. IT RECEIVES THE IPCF
;	MESSAGES FROM THE SYSTEM AND DISPATCHES TO THE APPROPRIATE
;	ROUTINE IN PLRLBP.

SUBTTL	Directory for PULSAR

SUBTTL	Global Variables

G$TXTB::BLOCK	TXTSIZ			;Text buffer
G$TXTP::BLOCK	1			;Byte pointer to text buffer
G$CPU::	BLOCK	1			;CPU TYPE CODE
G$TERM:: BLOCK	1			;TERMINATION CODE TO RETURN
G$DEBUG::BLOCK	1			;NON-ZERO FOR DEBUG
					; TO USER ON LABEL RELEASE
G$UNL::	BLOCK	1			;Non-zero if we're doing
					;and unload
G$PROC:: BLOCK	1			;0 If we're running at MAIN (exec) level
					; non-zero if running a TCB (user) level

G$LIST::BLOCK	1			;Space for the list handle for TCB list
G$MSGL::BLOCK	1			;List handle for deferred messages
G$ACK::	EXP	0			;Space for the sequential WTOR ack numbers
G$COD::	BLOCK	1			;ACK to give to MDA
G$SCHD::BLOCK	1			;-1 if we should look at processes

G$SAB::	BLOCK	SAB.SZ			;A free-for-all SAB
					;All users of this must set all
					;fields at runtime

G$MSAB:: $BUILD	SAB.SZ			;A SAB for sending to MDA
	  $SET	(SAB.SI,SI.FLG,1)	;Send by special index
	  $SET	(SAB.SI,SI.IDX,SP.MDA)	;Send to MDA
					;Users must set SAB.MS, SAB.LN
	 $EOB

;Some GETTABable items
G$SYSP:: BLOCK	1			;PPN for SYS: UFD (typically [1,4])
G$MFDP:: BLOCK	1			;PPN for MFD (typically [1,1])
G$FFAP:: BLOCK	1			;PPN for the operator (typically [1,2])
G$PROU:: BLOCK	1			;Default UFD protection
G$PSTP:: BLOCK	1			;Default standard file protection
G$INDP:: BLOCK	1			;INDEPENDANT PROJECT-PROGRAMMER NUMBERS
G$SETS:: BLOCK	1			;Flag if monitor supports disk sets
G$SETN:: BLOCK	1			;Disk set numbers monitor mounts (bit mask)

G$SEQC:: BLOCK	1			;CODE TO PROCESS SEQUENCE ERRORS
G$REEL:: BLOCK	1			;TEMP STORAGE FOR REELID (PLRINI)

	SLSIZE==.FSDSO+<3*^D36>		;SIZE OF A STRUUO SEARCH LIST ARG BLOCK
G$OSL::	BLOCK	SLSIZE			;OLD SEARCH LIST BLOCK
G$NSL::	BLOCK	SLSIZE			;NEW SEARCH LIST BLOCK
G$BLOK:: BLOCK	BLOKLN			;J-random UUO arg block space
					;Contents of this block are extremely volatile
					;User should CHKLN desired length
					;Against BLOKLN!

G$COMR:: BLOCK	1			;PC of the last call to COMERR

	SUBTTL	GLOBAL data (static)

;All these locations contain static data

;A table of type-able density values
G$DENS::
	$BUILD	.TFD62+1
	$SET	(.TFD00,,<[ASCIZ/Default/]>)
	$SET	(.TFD20,,<[ASCIZ/200/]>)
	$SET	(.TFD55,,<[ASCIZ/556/]>)
	$SET	(.TFD80,,<[ASCIZ/800/]>)
	$SET	(.TFD16,,<[ASCIZ/1600/]>)
	$SET	(.TFD62,,<[ASCIZ/6250/]>)
	$EOB

;A table of type-able label types
G$LTYP::
	$BUILD	LT.MAX+1
	$SET	(LT.BLP,,<[ASCIZ/Bypass/]>)
	$SET	(LT.SL ,,<[ASCIZ/ANSI/]>)
	$SET	(LT.SUL,,<[ASCIZ/ANSI with User labels/]>)
	$SET	(LT.IL ,,<[ASCIZ/IBM/]>)
	$SET	(LT.IUL,,<[ASCIZ/IBM with User labels/]>)
	$SET	(LT.LTM,,<[ASCIZ/Leading tape mark/]>)
	$SET	(LT.NSL,,<[ASCIZ/Non-standard/]>)
	$SET	(LT.NL ,,<[ASCIZ/No labels/]>)
IFN FTCOBOL,<
	$SET	(LT.CBA,,<[ASCIZ/COBOL ASCII/]>)
	$SET	(LT.CBS,,<[ASCIZ/COBOL SIXBIT/]>)
>;END IFN FTCOBOL
	$SET	(LT.NLV,,<[ASCIZ/No labels, User End of volume/]>)
	$EOB

SUBTTL	Initialization

PULSAR:	AOSE	STFLAG			;MAKE SURE WE AREN'T RESTARTED
	STOPCD	(PNR,HALT,,<PULSAR not restartable>)
	RESET				;Just for kicks
	MOVE	P,[IOWD PLR.SZ,PDL]	;SET UP A PUSHDOWN LIST
	MOVEI	S1,IB.SZ		;Size of the initialization block
	MOVEI	S2,IB			;There's the block!
	PUSHJ	P,I%INIT		;Get the library
	ZERO	G$TERM			;THIS IS ESSENTIALLY G$INIT
	$CALL	L%CLST			;Get a list handle for the TCB list
	MOVEM	S1,G$LIST		;Save for use throughout
	$CALL	L%CLST			;Get a list handle for the message list
	MOVEM	S1,G$MSGL		;Save for use throughout
	$CALL	.CPUTY			;GET CPU TYPE
	MOVEM	S1,G$CPU		;SAVE IT
TOPS10 <
	MOVX	S1,%FTST2		;SECOND FILE STRUCTURE PARAMETER WORD
	GETTAB	S1,			;GET IT
	  SETZ	S1,			;NOT SUPPORTED
	TRNN	S1,F%SETS&RHMASK	;FTSETS TURNED ON?
	TDZA	S1,S1			;NO, GET A ZERO AND SKIP
	SETO	S1,			;YES, GET A -1
	MOVEM	S1,G$SETS		;SAVE FOR DYNAMIC TESTS
	AOJN	S1,INIT.1		;JUMP IF FEATURE NOT TURNED ON
	MOVX	S1,%LDSET		;GET DISK SETS THIS MONITOR MOUNTS
	GETTAB	S1,			;GET IT
	  SETZ	S1,			;NOT SUPPORTED
	MOVEM	S1,G$SETN		;SAVE THAT ALSO
INIT.1:
>
	$LOG	(<PULSAR starting>,,,<$WTFLG(WT.SJI)>)
	PUSHJ	P,L$INIT##		;INITIALIZE THE LABEL PROCESSOR
	PUSHJ	P,T$INIT##		;THE TAPE I/O MODULE
	PUSHJ	P,I$INIT##		;AND THE SYSTEM INTERFACE
	PUSHJ	P,Q$INIT##		;AND THE CATALOG/QUOTA PROCESSOR

	$CALL	I%ION			;TURN ON THE PSI SYSTEM
	JRST	MAIN			;AND GO ON TO THE MAIN LOOP

STFLAG:	-1				;FLAG TO PREVENT RESTARTS

SUBTTL	Main Loop

MAIN:	MOVE	P,[IOWD PLR.SZ,PDL]	;Set up a PDL
	SETZ	S1,			;Set infinite sleep time
	$CALL	I%SLP			;Go hibernate till something happens
	SETZM	G$PROC			;Note that we're in the exec
	SKIPA				;Go read the messages
MAIN.1:	PUSHJ	P,CHKJOB		;Now look for a runnable process
	PUSHJ	P,CHKMSG		;Check queued and incoming messages
					;Process any that came in, but
					;we didn't get interrupted for
	SKIPE	G$SCHD			;Any more to service?
	JRST	MAIN.1			;Do some more work
	JRST	MAIN			;Do this forever

	SUBTTL	CHKMSG - Check incoming and queued messages

;This routine will check each message in the queue for runnability
; and try to get the messages off the queue.
; It will also check the incoming IPCF message queue

CHKMSG:	MOVE	S1,G$MSGL		;Get queued message list handle
	$CALL	L%FIRST			;Get the first entry in the queue
	JUMPF	CHKM.3			;Nothing there
CHKM.1:	MOVE	M,S2			;Copy the adrs of the message
	PUSHJ	P,PRCMSG		;Try it out
	JUMPF	CHKM.2			;Doesn't work now, try later
	MOVE	S1,G$MSGL		;Get back the list handle
	$CALL	L%DENT			;All done with this message, delete it
CHKM.2:	MOVE	S1,G$MSGL		;Get list handle again
	$CALL	L%NEXT			;Try the next message
	JUMPT	CHKM.1			;There is one, try it
CHKM.3:	PJRST	CHKIPC			;Try to do some IPCF work

SUBTTL	CHKIPC -- Routine to check for incoming IPCF messages from interesting processes

;This routine returns immediately if no IPCF message is available.
;It will pass each message to the appropriate handler

CHKIPC:	$SAVE	<P1>			;Save some regs
CHKI.A:	$CALL	C%RECV			;Go get a message
	JUMPF	.RETT			;All done if no more there!
	MOVE	P1,S1			;Copy the MDB adrs
	MOVX	S1,MSGNOM		;Set no-match index
	LOAD	S2,MDB.SI(P1),SI.FLG	;Get the special index flag
	JUMPE	S2,CHKI.C		;Not from a special job, flush it
	LOAD	S2,MDB.SI(P1),SI.IDX	;Special PID, get PID index
	CAXN	S2,SP.IPC		;Is it from the monitor?
	 MOVX	S1,MSGTLP		;Yes, should be tape message
	CAXE	S2,SP.QSR		;From OPR via QUASAR?
	CAXN	S2,SP.OPR		;From OPR (a command!)
	 MOVX	S1,MSGCOM		;Yes, probably HELP!
CHKI.C:	LOAD	M,MDB.MS(P1),MD.ADR	;Get addrs of message
	PUSHJ	P,@MSGTAB(S1)		;Mold the message into shape
	JUMPF	CHKI.D			;Can't make it look reasonable, flush it
	PUSHJ	P,PRCMSG		;Process this message
	JUMPT	CHKI.D			;If we can do it now, delete it
	MOVE	S1,G$MSGL		;Can't do it now, queue it up
	$CALL	L%LAST			;Get to the end of the list
	MOVE	S1,G$MSGL		;Get the message list handle again
	LOAD	S2,MDB.MS(P1),MD.CNT	;Get the size of the message
	$CALL	L%CENT			;Add a message to the end of the list
	LOAD	S1,MDB.MS(P1),MD.ADR	;Get the adrs of the message again
	MOVSS	S1			;Move from the message
	HRR	S1,S2			;To the list entry
	LOAD	S2,MDB.MS(P1),MD.CNT	;Get size once more
	ADDI	S2,0(S1)		;Figure termination adrs
	BLT	S1,-1(S2)		;Copy the message
CHKI.D:	$CALL	C%REL			;Release that message
	JRST	CHKI.A			;Try for another message

	;CONTINUED ON THE NEXT PAGE

	;CONTINUED FROM THE PREVIOUS PAGE

;These routines handle the messages from the two sources:
;Tape position requests
;Operator commands
;These routine are responsible for making sure that messages from
; different sources are distinguishable even if all messages are placed
; in the G$MSGL queue for messages.

DEFINE MSGNAM,<
	..Z==0
	X	(MSGNOM,.RETF)		;;Junk mail
	X	(MSGCOM,.RETT)		;;Operator commmand (from OPR)
	X	(MSGTLP,CHKI.M)		;;Tape postion req. (from monitor)
>
DEFINE X(OFFSET,RTN),<
	OFFSET==..Z
	EXP	<RTN>
	..Z==..Z+1
>

MSGTAB:	MSGNAM				;Build the indexes and the table

;Massage routine for messages from the monitor
;IE make the type code unique among messages from ORION, QUASAR, etc.
CHKI.M:
	LOAD	S1,TLM.HD(M),TH.FUN	;Get the message type
	CAIE	S1,.IPCTL		;Tape labeling message?
	$RETF				;No, Then the montior has fouled up!
	MOVX	S1,MONMSG		;Internal code for monitor message
	STORE	S1,.MSTYP(M),MS.TYP	;Make the message discernable
	$RETT

	SUBTTL	PRCMSG - Process a message

;This routine will dispatch to the appropriate message processor
; for a certain message.
;Call -
;	M/	Message adrs (queued or just-received)
;Returns
;	TRUE/	Message has been processed
;	FALSE/	Message not processed (caller should Q it up)

PRCMSG:
	LOAD	S1,.MSTYP(M),MS.TYP	;Get type field of header
	MOVSI	S2,-NUMMAI		;Make AOBJN to main keyword table
PRCM.1:	HLRZ	T1,MAITAB(S2)		;Get next keyword
	CAIE	T1,(S1)			;Match what parser returned?
	AOBJN	S2,PRCM.1		;No, try again
	SKIPL	S2			;Hit one?
	JSP	S1,COMERR##		;No, things are strange
	HRRZ	S2,MAITAB(S2)		;Get service routine addr
	MOVE	S1,.MSCOD(M)		;Get the ack code
	MOVEM	S1,G$COD		;Save it in case we have to send ack
	PJRST	(S2)			;Go handle the particular message

;Each of these routines should return TRUE if the message has been
; completely processed (even if it is not understandable).  If the
; desired action cannot be performed now, then the routine
; must return false.
	MONMSG==100000			;Unique code for monitor message
MAITAB:	MONMSG,,MSGD.T			;Monitor message for label processing
	.OMRSP,,O$CRSP##		;Keyword code ,, service routine
	.QOREC,,O$CREC##		;Recognize (kick AVR) from QUASAR
	.QOUNL,,O$CUNL##		;Unload command
	.QOVMN,,O$CVMN##		;Volume given to user
	.QOVDM,,O$CVDM##		;Volume deassigned (dismounted)
	.QOVSD,,O$CVSD##		;Volume switch directive
	.QOREW,,O$CREW##		;Rewind a volume at switch time
	.QOBLD,,O$CBLD##		;Build a structure
	.QODSM,,O$CDSM##		;Dismount a structure
	.QOASL,,O$CASL##		;Add str to user's search list
					; (or remove from search list)
	.ODCSL,,O$CLST##		;ADD/REM STR/UNI FROM SSL/ASL/SDL
	.ODSSL,,O$SLST##		;SHOW SYSTEM LISTS
	.ODSTP,,V$IMSG##		;Set Tape INITIALIZE
	.OMHAC,,Q$AACK##		;Application Hello ACK
	.OMCMD,,Q$OCMD##		;Command from OPR
	NUMMAI==.-MAITAB		;Length of the table

	SUBTTL	Message handler for monitor-generated messages

;Message from the monitor (on tape postioning, or unit on-line)
MSGD.T:	LOAD	S1,TLM.ST(M),TS.RQT	;GET THE REQUEST TYPE ON TAPE LABEL MSG
	SKIPLE	S1			;ZERO OR NEGATIVE REQUEST?
	CAILE	S1,LR.MAX		;OR GREATER THAN MAX?
	JSP	S1,COMERR		;Illegal request, flush it
IFN FTTRACE,<
	SKIPE	G$DEBUG			;Are we debugging?
	$TEXT	(,<Recieved message - ^T/@MSGD.1(S1)/>)
	JRST	MSGD.2			;Jump around message table
MSGD.1:	[ASCIZ //]
	[ASCIZ /FIRST INPUT/]
	[ASCIZ /FIRST OUTPUT/]
	[ASCIZ /POSITIONING/]
	[ASCIZ /TAPE MARK/]
	[ASCIZ /EOT/]
	[ASCIZ /CLOSE INPUT/]
	[ASCIZ /CLOSE OUTPUT/]
	[ASCIZ /FORCE EOV/]
	[ASCIZ /USER REQUEST/]
	[ASCIZ /ABORT/]
MSGD.2:
>;End IFN FTTRACE
	LOAD	S1,TLM.DV(M)		;GET THE DEVICE NAME FROM MESSAGE
	PUSHJ	P,G$FTCB		;GO FIND THE TCB
	JUMPF	MSGD.3			;GIVE THIS GUY AN ERROR
	LOAD	S1,TLM.ST(M),TS.RQT	;GET THE REQUEST TYPE ON TAPE LABEL MSG
	SKIPL	S1,MSGD.4(S1)		;GET FLAGS,,DISPATCH
	SKIPN	TCB.WS(B)		;THIS TCB IDLE?
	SKIPA	S2,[TI.ABO]		;FUNCTION IS OK EVEN IF TCB ISN'T IDLE
	$RETF				;NO, PROCESS IT LATER
	TLNE	S1,LD.ABO		;ABORTING?
	IORM	S2,TCB.IO(B)		;TURN ON FOR THE SCHEDULER
	LOAD	S2,TLM.ST(M),TS.INF	;GET XTRA INFO FROM MESSAGE
	STORE	S2,TCB.IN(B)		;STORE IN TCB
	LOAD	S2,TLM.ST(M),TS.RQT	;GET BACK REQUEST TYPE FROM MESSAGE
	HRRZS	S1			;STRIP OFF FLAGS
	PJRST	G$NPRC			;CREATE NEW STACK

;Here if the monitor requests action on a non-mounted drive
MSGD.3:	MOVX	S1,LE.IOP		;GET 'INVALID OPERATION' ERROR CODE
	MOVEM	S1,G$TERM		;SAVE AS ERROR
	LOAD	S1,TLM.DV(M)		;GET THE DEVICE NAME
	PUSHJ	P,T$LGET##		;DO THE LABEL GET ON THAT DEVICE
					;AND KEEP THE USER MOVING, IF POSSIBLE
	$RETT				;AND LOOK FOR MORE MESSAGES


; Labeler function dispatch
; Format: XWD	flags,processor-addr
; where flags are:

	LD.ANY==400000			;LEGAL FOR ANY WS (MUST BE SIGN BIT)
	LD.ABO==200000			;ABORT


MSGD.4:	XWD	0,0			;ILLEGAL REQUEST TYPE, CAUGHT ABOVE
	XWD	0,L$FINPUT##		;FIRST INPUT
	XWD	0,L$FOUTPUT##		;FIRST OUTPUT
	XWD	0,L$POSI##		;POSITIONING REQUEST
	XWD	0,L$TMARK##		;TAPE MARK SEEN
	XWD	0,L$EOT##		;PHYSICAL EOT SEEN
	XWD	0,L$CLIN##		;CLOSE INPUT
	XWD	0,L$CLOU##		;CLOSE OUTPUT
	XWD	0,L$FEOV##		;FORCE END OF VOLUME
	XWD	0,L$USRQ##		;USER REQUEST
	XWD	LD.ANY+LD.ABO,L$ABOR##	;ABORT CURRENT OPERATION

SUBTTL	CHKJOB -- Check and Run Processes

CHKJOB:	SKIPN	G$SCHD			;Anything to do?
	$RETT				;No, quit fast!
	SETZM	G$SCHD			;Note that we've seen it
	$SAVE	<P1>			;Preserve a work space
	MOVE	S1,G$LIST		;Get list handle
	$CALL	L%FIRST			;Start at head of list
CHKJ.1:	JUMPF	.RETT			;Empty list
	MOVE	P1,S2			;Save addr of this entry
	$CALL	L%RENT			;Remember this entry
	MOVE	T1,TCB.WS(P1)		;GET THE WAIT STATE CODE
	MOVX	T2,TI.ABO		;GET THE ABORT OPERATION BIT
	TDNN	T2,TCB.IO(P1)		;ABORTING?
	JUMPGE	T1,CHKJ.2		;NO--STEP TO NEXT IF THIS NOT RUNNABLE
	MOVEM	P1,TCB.AC+B(P1)		;Make process' B point to TCB
	TDNN	T2,TCB.IO(P1)		;ABORTING?
	SETZM	TCB.WS(P1)		;NO--MARK TCB AS IDLE NOW
	MOVEM	P,LSAVEP		;Save our stack so we can return to
					;caller of CHKJOB when process blocks
	MOVSI	0,TCB.AC+1(P1)		;SWAP US
	HRRI	0,1			; INTO TCB
	BLT	0,17			;  TCB CONTEXT
	MOVE	0,TCB.AC(B)		;RESTORE AC 0

	SETZM	G$TERM			;Flag no error
	SETOM	G$PROC			;Note we're running a (user) process
	POPJ	P,			;THIS POPJ RETURNS TO THE PROCESS
					; AT THE PLACE IT BLOCKED (OR
					; STARTS THE PROCESS AT THE APPROPRIATE
					; L$XXXX ROUTINE

;THE TCB IS SET UP SUCH THAT THE LAST POPJ BACK TO THE TOP LEVEL
;WILL RETURN HERE. A PROCESS ALSO PUSHJ'S HERE WHEN IT IS BLOCKED.

G$NJOB:: MOVEM	TF,TCB.AC+TF(B)		;Save 'TF' in the TCB
	MOVE	TF,[S1,,TCB.AC+S1]	;Get source,,destination offset
	ADDI	TF,0(B)			;Get source,,destination address
	BLT	TF,TCB.AC+17(B)		;Save the TCB context
	MOVE	P,LSAVEP		;Get back to caller of CHKJOB
					;stack context
	MOVE	S1,G$LIST		;Get list handle
	$CALL	L%PREM			;Get back to wherever we were
	SKIPF				;Some one else is messing around
	CAME	S2,B			;Same as one we dispatched to?
	STOPCD	(PLM,HALT,,<Previous list TCB has been meddled>)
	AOSE	G$PROC			;Clear the user mode flag
	STOPCD	(RSE,HALT,,<Reschedule from exec level>) ;We weren't in a process?

	;CONTINUED ON THE NEXT PAGE

	;CONTINUED FROM THE PREVIOUS PAGE

	MOVX	S1,TS.KIL		;Does TCB want to quit?
	TDNN	S1,TCB.ST(B)		;By lighting this bit?
	JRST	CHKJ.2			;No, proceed normally
	MOVE	S1,B			;Aim at the TCB
	PUSHJ	P,G$DTCB		;Delete it

CHKJ.2:	MOVE	S1,G$LIST		;Get back the list handle
	$CALL	L%NEXT			;Try next TCB
	JRST	CHKJ.1			;Do it all over

SUBTTL	Process control routines

;These routines are used to change the state of a process and
; start up a new process.  They must be called with B aimed at the TCB

;G$STTR sets TRUE for a process, and starts it up
G$STTR::PUSHJ	P,.RETT			;Get TRUE indicator
	PJRST	G$STTF			;Set for process

;G$STFL sets FALSE for a process, and starts it up
G$STFL::PUSHJ	P,.RETF			;Get FALSE indicator
;	PJRST	G$STTF			;Save it, and start the process
;Fall through

;G$STTF sets either true or false, depending on the current state of the
; TF indicator
;Then, it sets the process runnable
G$STTF::MOVEM	TF,TCB.AC+TF(B)		;Store indicator
;	PJRST	G$STRN			;Start the process
;Fall through

;G$STRN sets a process as runnable
G$STRN::MOVX	TF,TI.ABO		;GET ABORT BIT
	TDNE	TF,TCB.IO(B)		;ABORTING?
	SKIPA	S1,TCB.WS(B)		;YES
	MOVX	S1,TW.RUN		;GET RUNNABLE CODE
	MOVEM	S1,TCB.WS(B)		;SET WAIT STATE
	DOSCHD				;FORCE A SCHEDULING PASS
	$RETT				;RETURN

SUBTTL	More process control routines

;G$OJOB - Break out of a process to allow others to run
; Is useful if label service will take extraordinarily long,
; and since we are a single server for all tapes, we should break
; out when possible
G$OJOB::PUSHJ	P,G$STRN		;Keep this one runnable
	PJRST	G$NJOB			;But allow others to get worked on

;G$NPRC Creates a stack context for the process.
;The process will run at the address passed in S1.
G$NPRC::MOVE	TF,[IOWD TCB.PZ,TCB.PL]	;Get a stack
	ADDI	TF,(B)			;Relocate into TCB
	PUSH	TF,[G$NJOB]		;Save termination address
	PUSH	TF,S1			;Save start address
	MOVEM	TF,TCB.AC+P(B)		;Save stack pointer
	PJRST	G$STRN			;And mark this one runable

;G$PREQ - Request work from another process
;This routine allows one process to have another process
; do some work, and return to the calling process when
; the work is complete.
;Call with the requesting TCB in B.
; S1/ routine to start other TCB at
; S2/ 'other' TCB, which will do the work.
;Returns True or False, the results of the other TCB's work
;Does not return until the other process completes the work

G$PREQ::
	$SAVE	<P1,P2>
	DMOVE	P1,S1			;Save the input arguments
	LOAD	S1,TCB.WS(P2)		;Get the other guy's wait state
	CAIE	S1,TW.IGN		;Is it busy?
	STOPCD	(RAT,HALT,,<Requesting work for active TCB>)
	MOVX	S1,TW.BLK		;Get state code for 'blocked'
	STORE	S1,TCB.WS(B)		;Mark caller as blocked
	EXCH	B,P2			;Swap to new TCB
	MOVE	S1,TCB.DV(P2)		;1st item on stack - other TCB
	PUSHJ	P,G$NPRC		;Start process from scratch
	EXCH	P,TCB.AC+P(B)		;Get process stack
	PUSH	P,[G$UBLK]		;Routine to run when done - unblocker
	PUSH	P,P1			;Start at caller's request
	EXCH	P,TCB.AC+P(B)		;Put the stacks back right
	EXCH	P2,B			;Get back to old TCB
	PUSHJ	P,G$NJOB		;Stop this guy, for a while
	$RET				;Give T/F from other process to caller

;G$UBLK - Exit handler for blocked processes
;A process which is doing work for another process will
; return here when the work has been done
G$UBLK:	POP	P,S1			;Get the blocked TCB name
	PUSH	P,B			;Save this (running) TCB
	PUSH	P,TF			;Save T/F from work done
	PUSHJ	P,G$FTCB		;Get the waiting TCB back
	SKIPT				;It better be there!
	STOPCD	(WNF,HALT,,<Waiting TCB not found>)
	POP	P,TCB.AC+TF(B)		;Give true or false to blocked process
	PUSHJ	P,G$STRN		;Mark this one as runnable
	POP	P,B			;Get back to running TCB
	$RETT				;Go run someone else

SUBTTL	Utility Routines -- Routine to Make a TCB
;Called with:
;T1 - SIXBIT device name
;T2 - Job number
;T3 - PPN of (prospecitve) owner
;Returns:
;B - Has address of TCB
;	True (always)

G$MTCB::PUSH	P,T1			;SAVE T1
	PUSH	P,T2			;AND T2
	PUSH	P,T3			;AND T3
	MOVE	S1,T1			;GET DEVICE NAME IN S1
	PUSHJ	P,G$FTCB		;SEE IF WE CAN FIND THIS ONE
	JUMPT	MAKT.2			;ITS ALREADY THERE, USE IT
	MOVE	S1,G$LIST		;Get back list handle
	MOVEI	S2,TCB.SZ		;Get size of TCB
	$CALL	L%CENT			;Create the new TCB
	MOVE	B,S2			;Save start of block
MAKT.2:	PUSH	P,TCB.CH(B)		;Save the characteristics
	PUSH	P,TCB.IO(B)		;Save the I/O status
	SETZM	TCB.FZ(B)		;Knock off first location
	MOVEI	S1,TCB.FZ+1(B)		;Get destination addr for BLT
	HRLI	S1,-1(S1)		;Set Source addr
	BLT	S1,TCB.LZ(B)		;Clear the TCB
	POP	P,TCB.IO(B)		;RESTORE THE I/O STATUS
	POP	P,TCB.CH(B)		;AND THE CHARACTERISTICS
	POP	P,TCB.OW(B)		;GET BACK OWNER'S PPN
	POP	P,TCB.JB(B)		;AND JOB NUMBER
	POP	P,TCB.DV(B)		;AND DEVICE NAME
	MOVE	S1,TCB.DV(B)		;Get drive name
	PUSHJ	P,I$DEVT##		;Get the device type code
	STORE	S1,TCB.CH(B),TC.TYP	;Save device type in TCB
	MOVX	S1,.OTMNT		;Object type - MOUNT device
	STORE	S1,TCB.OB(B)		;Save it
	$RETT				;Give true return

SUBTTL	G$DTCB - Routine to destroy a TCB

;This routine takes a TCB addr in B, and gives back its storage
;It must NOT be called with the stack in the TCB's context,
;since this would put the stack into NXM.
;Call -
;	S1/	TCB addr to delete
;Returns -
;	TRUE

G$DTCB::MOVE	S2,S1			;Keep TCB addr
	MOVE	S1,G$LIST		;Get the list handle for TCBs
	$CALL	L%APOS			;Get to that entry of the list
	$CALL	L%DENT			;And destroy it
	$RETT

SUBTTL	Utility Routines -- Routine to Find A TCB From an ITN

;CALLED WITH S1 CONTAINING THE ITN
;RETURNS TRUE/FALSE, TCB ADDRESS IN B

FNDITN:	MOVE	T1,S1			;Save the arg
	MOVE	S1,G$LIST		;GET list handle
	$CALL	L%FIRST			;Start at begining
FNDI.1:	JUMPF	.RETF			;Quit if list is empty
	MOVE	B,S2			;Save ptr to entry
	LOAD	T2,TCB.VL(B)		;GET WORD WHERE ITN IS KEPT
	CAMN	T2,T1			;IS THIS THE ONE?
	$RETT				;YES RETURN TRUE
	$CALL	L%NEXT			;Step to the next entry
	JRST	FNDI.1			;Try this one

	SUBTTL	G$REST - PULSAR RESTART (REENTER) PROCESSING ROUTINE

	;This routine is given control on a REENTER command to PULSAR.
	;It is used to recover from a hung device crash caused by the
	;monitor. It will pick up the last PC from location 130, and
	;restart execution from there.

G$REST:	SKIPG	130			;CHECK THE RESTART ADDRESS
	PUSHJ	P,S..PNR		;NO GOOD,,STOPCODE
	JRST	@130			;RESTART THE PROGRAM

SUBTTL	G$FTCB -- Routine to Find a TCB
;Call with Device name in S1
;Return with TCB addr in B if true.

G$FTCB:: PUSHJ	P,.SAVET		;SAVE SOME REGISTERS
	MOVE	T1,S1			;GET HEAD OF TCB CHAIN
	MOVE	S1,G$LIST		;Get list handle
	$CALL	L%FIRST			;Start at head of list
FNDT.1:	JUMPF	.RETF			;Quit at end of list
	MOVE	B,S2			;GET TCB ADR INTO B
	LOAD	T2,TCB.DV(B)		;GET DEVICE NAME FOR THIS TCB
	CAMN	T2,T1			;IS IT THE ONE
	$RETT				;GIVE GOOD RETURN
	$CALL	L%NEXT			;Advance to next element
	JRST	FNDT.1			;Try this one

SUBTTL	G$FACK -- Routine to Find a TCB waiting for WTOR
;Call with ACK code to be matched in S1
;Returns TCB addr in B if true, false if no TCB has that ack number

G$FACK::PUSHJ	P,.SAVET		;Save some regs
	MOVE	T1,S1			;Save required ack number
	MOVE	S1,G$LIST		;Get list handle
	$CALL	L%FIRST			;Start at top of list
G$FA.1:	JUMPF	.RETF			;End of list, no match
	MOVE	B,S2			;Aim at TCB
	LOAD	T2,TCB.AK(B)		;Get this guy's ack #
	JUMPE	T2,G$FA.2		;No ack here?
	CAMN	T2,T1			;There is one, does it match?
	$RETT
G$FA.2:	$CALL	L%NEXT			;Move to next entry
	JRST	G$FA.1			;Try this one

SUBTTL	Text buffer routines


; Initialize the text buffer
; Call:	PUSHJ	P,G$TXTI
;
G$TXTI::$SAVE	<S1>			;Save S1 (others depend on it)
	SETZM	G$TXTB			;Clear the first word
	MOVE	S1,[G$TXTB,,G$TXTB+1]	;Set up BLT
	BLT	S1,G$TXTB+TXTSIZ-1	;Clear the buffer
	MOVE	S1,[POINT 7,G$TXTB]	;Set up byte pointer
	MOVEM	S1,G$TXTP		;Store it
	POPJ	P,			;Return


; Store a character in the text buffer
; Call:	MOVE	S1,character
;	PUSHJ	P,G$TYPE
;
G$TYPE::SKIPN	G$TXTB+TXTSIZ-1		;Buffer full ?
	IDPB	S1,G$TXTP		;No - deposit character
	POPJ	P,			;Return

SUBTTL	Local Storage

	PLR.SZ==140			;Size of the PDL
PDL:	BLOCK	PLR.SZ			;PUSHDOWN LIST

IB:	$BUILD	IB.SZ

	$SET	(IB.FLG,IP.STP,1)	;Send stopcodes to ORION

	$SET	(IB.INT,,VECTOR##)	;The PSI interrupt vectors

	$SET	(IB.PIB,,PIB)		;Aim at the desired PID block

	$SET	(IB.PRG,,%%.MOD)	;Program name

	$EOB

;Build the PID block describing us as the Tape Labeller.
PIB:	$BUILD	PB.MNS			;A small PID block

	$SET	(PB.HDR,PB.LEN,PB.MNS)	;Size of this block

	$SET	(PB.FLG,IP.PSI,1)	;Use PSI for IPCF
	$SET	(PB.FLG,IP.JWP,1)	; get me a job-wide PID
	$SET	(PB.FLG,IP.SPF,1)	;  and make me a system PID

	$SET	(PB.INT,IP.CHN,CHNIPC)	;Offset to IPCF intrupt block
	$SET	(PB.INT,IP.SPI,SP.TLP)	;This PID is for the tape labeller

	$SET	(PB.SYS,IP.SQT,^D511)	;Infinite send quota
	$SET	(PB.SYS,IP.RQT,^D511)	;Infinite receive quota

	$EOB

LSAVEP:	BLOCK	1			;Storage for P while jobs
					;run under CHKJOB dispatching

SUBTTL	G$SMDA - Send a message to MDA

;This routine is used to send any message to MDA
;Call -
;	S1/	Length of the message
;	S2/	Adrs of the message
;Returns
;	TRUE (always)

G$SMDA::
	STORE	S1,G$MSAB+SAB.LN	;Save the length
	STORE	S2,G$MSAB+SAB.MS	;Save the adrs of the message
	DMOVE	S1,[EXP SAB.SZ,G$MSAB]	;Aim at the argument block
	$CALL	C%SEND			;Fire it off to MDA
	$RETT
	END	PULSAR