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Trailing-Edge - PDP-10 Archives - bb-bt99e-bb - ovrlay.c07
There is 1 other file named ovrlay.c07 in the archive. Click here to see a list.
 REP 2/1	;07C1
	SUBTTL	D.M.NIXON/DMN/JLd/JNG/MCHC/DZN/PAH/HD	20-Jan-83
 WIT
	SUBTTL	D.M.NIXON/DMN/JLd/JNG/MCHC/DZN/PAH/HD/JBS/TARL	24-Oct-83
 REP 30/1	;07C2
	DECEVR==204		;DEC EDIT VERSION
 WIT
	DECEVR==210		;DEC EDIT VERSION
 INS 79/7	;07C3
	;205	HD	1-Feb-83
	;	Fix edit 201. It should ask for default number of output buffers only
	;	by putting -1,,0 in .FONBF at LFOWRT.

	;206	JBS	25-Jul-83
	;	Make dummy edit for TOPS-10 OVRLAY - two lines were swapped in
	;	the released version at RLO7.

	;207	TARL	28-Aug-83
	;	Fix problem with running virtual with overlays. OVRLAY could
	;	request a transfer that wouldn't fit in physical memory, and
	;	PFH can't split up FILOP. IOWDs. Make OVRLAY check for amount
	;	of memory allowed to use, and split up its request to fit
	;	in this size. This should also prove to be a slight performance
	;	win.  TOPS-10 only.

	;210	JBS	24-Oct-83
	;	Set FO.PRV in all FILOP. blocks so privileged users (JACCT and [1,2])
	;	can run overlaid programs when pathed into another PPN.  TOPS-10 only.
 REP 27/29	;07C4
	;**; Unrelocate the link here if necessary.
 WIT
	; Unrelocate the link here if necessary.
 REP 16/40	;07C5
		HRRM	T0,(T1)
		ADD	T0,T3
 WIT
		HRRM	T0,(T1)			;[206]
		ADD	T0,T3			;[206]
 REP 5/48	;07C6
	OVLINI:	MOVX	T1,FO.ASC		;[100] ALLOCATE A NEW CHANNEL
 WIT
	OVLINI:	MOVX	T1,FO.PRV+FO.ASC 	;[210] GET EXTENDED CHANNEL WITH PRIVS
 REP 8/49	;07C7
	TMPINI:	MOVX	T1,FO.ASC+.FOWRT	;[100] ASK FOR CHAN AND SUPERSEDE
 WIT
	TMPINI:	MOVX	T1,FO.PRV+FO.ASC+.FOWRT	;[210] ASK FOR CHAN, SUPERSEDE, PRIVS
 INS 22/49	;07C8
		MOVX	T1,FO.PRV		;[210] WANT TO USE PRIVS
		IORM	T1,TFOREL+.FOFNC	;[210] PUT INTO BLOCK
 REP 26/49	;07C9
		MOVX	T1,FO.ASC+.FOSAU	;[100] FIX FILOP. BLOCK FOR UPDATE
 WIT
		MOVX	T1,FO.PRV+FO.ASC+.FOSAU	;[210] FIX FILOP. BLOCK FOR UPDATE
 INS 20/50	;07C10
		TXO	T1,FO.PRV		;[210] ASK FOR PRIVS IF WE'VE GOT THEM
 REP 31/50	;07C11
	;THE THREE ROUTINES HERE ALL READ DATA FROM THE OVERLAY OR TEMPORARY FILE,
	;PRESERVING ALL ACCUMULATORS. %INB SETS UP A COMPLETE COMMAND LIST ASSUMING 200
	;WORDS AT INBFR, %INZ ASSUMES THAT THE COMMAND WORD IS ALREADY IN T0 AND NEEDS
	;ONLY THE ENDING 0 IN T1, AND %IN ASSUMES THAT THE ENTIRE LIST IS ALREADY SET
	;UP, BEGINNING IN T0.

	%INB:	MOVE	T0,[IOWD 200,INBFR]	;[100] SET UP DEFAULT COMMAND LIST
	%INZ:	SETZ	T1,			;[100] FINISH PRE-SPECIFIED LIST
	%IN:	PUSH	P,T2			;[100] SAVE AN AC FOR FILOP.
 WIT
	;[207] THE TWO ROUTINES HERE READ DATA FROM THE OVERLAY OR TEMPORARY
	;[207] FILE, PRESERVING ALL ACCUMULATORS. %INB SETS UP A COMPLETE
	;[207] COMMAND LIST ASSUMING 200 WORDS AT INBFR, %INZ ASSUMES THAT THE
	;[207] COMMAND WORD IS ALREADY IN T0 AND NEEDS ONLY THE ENDING 0 IN
	;[207] T1.

	%INB:	MOVE	T0,[IOWD 200,INBFR]	;[100] SET UP DEFAULT COMMAND LIST
	%INZ:	PUSH	P,T2			;[207] SAVE AN AC FOR FILOP.
 REP 45/50	;07C12
		MOVE	T2,[.FOIOS+1,,FILBLK]	;[100] READ IN THE DATA
		FILOP.	T2,			;[100]   ..
 WIT
		PUSHJ	P,%FILIO		;[207] DO FILOP I/O
 INS 13/51	;07C13
		TXO	T1,FO.PRV		;[210] ASK FOR PRIVS IF WE'VE GOT THEM
 REP 31/51	;07C14
		MOVE	T2,[.FOIOS+1,,FILBLK]	;[100] READ IN THE DATA
		FILOP.	T2,			;[100]   ..
 WIT
		PUSHJ	P,%FILIO		;[207] DO FILOP I/O
 INS 37/51	;07C15

	;[207] %FILIO WILL EXECUTE A DUMP MODE IN OR OUT FILOP, BREAKING THE
	;[207] IOWD UP INTO SMALL ENOUGH CHUNKS TO FIT INTO PHYSICAL MEMORY
	;[207] LIMITS. THIS IS TO GET AROUND A DEFICIENCY IN PFH WHERE IT WILL
	;[207] NOT DO BREAKDOWN OF FILOP I/O.  ASSUMES T0 HAS THE IOWD,
	;[207] TRASHES T1 AND T2.

	%FILIO:	PUSH	P,T0			;[207] SAVE IOWD
		PUSH	P,T3			;[207] SCRATCH REGISTER TO KEEP SIZE IN
		HLRO	T3,T0			;[207] GET SIZE TO DO IN NEGATIVE WORDS
		MOVN	T3,T3			;[207] MAKE IT POSITIVE WORDS
	%FILI1:	CAIG	T3,1000			;[207] IS REQUEST LARGER THAN 1 PAGE?
		  JRST	%FILI2			;[207] NO, JUST DO IT.
		PUSHJ	P,%IOSIZ		;[207] FIND OUT WHAT SIZE IS ALLOWED
		JUMPE	T1,%FILI3		;[207] NOT VIRTUAL, JUST GO DO IT.
		CAML	T1,T3			;[207] WILL REQUEST FIT?
		  JRST	%FILI2			;[207] YES, JUST DO IT
		MOVN	T1,T1			;[207] NO, SET UP FOR WHAT WE CAN DO
		HRL	T0,T1			;[207] ADJUST IOWD TO DO WHAT WE CAN
	%FILI2:	SETZ	T1,			;[207] END OF IOWD
	%FILI3:	MOVX	T2,FO.PRV		;[210] WANT TO USE PRIVS
		IORM	T2,FILBLK+.FOFNC	;[210] PUT INTO BLOCK
		MOVE	T2,[.FOIOS+1,,FILBLK]	;[207] ARGUMENT WORD FOR FILOP
		FILOP.	T2,			;[207] DO THE I/O
		  JRST	%FILI8			;[207] FAILED, GIVE FAIL RETURN
		HLRO	T1,T0			;[207] NEGATIVE AMOUNT WE DID
		ADD	T3,T1			;[207] SUBTRACT AMOUNT DONE FROM
						;[207] AMOUNT LEFT
		JUMPE	T3,%FILI7		;[207] DONE
		SUB	T0,T1			;[207] ADD AMOUNT DONE TO POINTER
		MOVN	T1,T3			;[207] NEGATIVE SIZE TO GO
		HRL	T0,T1			;[207] MAKE IOWD FOR AMOUNT LEFT TO DO

	;[207] NOTE THAT THE CODE FROM %FILI4 THROUGH %FILI7 IS AN EXACT
	;[207] DUPLICATE OF THE CODE FROM %FILI1 THROUGH %FILI4. THIS IS TO
	;[207] EXPLICITLY DEFEAT THE CHECK IN PFH AT FULL1-2, WHERE HE CHECKS
	;[207] THE PC OF THE UUO. THIS WILL CAUSE BIGXFR/1000 PAGE FAULTS AT
	;[207] ONE PC, THEN THE SAME NUMBER OF PAGE FAULTS AT THE NEXT PC,
	;[207] THEREBY BYPASSING THE DUMP MODE I/O CHECK

	%FILI4:	CAIG	T3,1000			;[207] IS REQUEST LARGER THAN 1 PAGE?
		  JRST	%FILI5			;[207] NO, JUST DO IT.
		PUSHJ	P,%IOSIZ		;[207] FIND OUT WHAT SIZE IS ALLOWED
		JUMPE	T1,%FILI6		;[207] NOT VIRTUAL, JUST GO DO IT.
		CAML	T1,T3			;[207] WILL REQUEST FIT?
		  JRST	%FILI5			;[207] YES, JUST DO IT
		MOVN	T1,T1			;[207] NO, SET UP FOR WHAT WE CAN DO
		HRL	T0,T1			;[207] ADJUST IOWD TO DO WHAT WE CAN
	%FILI5:	SETZ	T1,			;[207] END OF IOWD
	%FILI6:	MOVX	T2,FO.PRV		;[210] WANT TO USE PRIVS
		IORM	T2,FILBLK+.FOFNC	;[210] PUT INTO BLOCK
		MOVE	T2,[.FOIOS+1,,FILBLK]	;[207] ARGUMENT WORD FOR FILOP
		FILOP.	T2,			;[207] DO THE I/O
		  JRST	%FILI8			;[207] FAILED, GIVE FAIL RETURN
		HLRO	T1,T0			;[207] NEGATIVE AMOUNT WE DID
		ADD	T3,T1			;[207] SUBTRACT AMOUNT DONE FROM
						;[207] AMOUNT LEFT
		JUMPE	T3,%FILI7		;[207] DONE
		SUB	T0,T1			;[207] ADD AMOUNT DONE TO POINTER
		MOVN	T1,T3			;[207] NEGATIVE SIZE TO GO
		HRL	T0,T1			;[207] MAKE IOWD FOR AMOUNT LEFT TO DO
		JRST	%FILI1			;[207] AND LOOP
	%FILI7:	AOS	-2(P)			;[207] SET UP SUCCESS RETURN
	%FILI8:	POP	P,T3			;[207] RESTORE SCRATCH REGISTER
		POP	P,T0			;[207] AND RESTORE ORIGINAL IOWD
		POPJ	P,			;[207] AND RETURN

	;[207] %IOSIZ - RETURN MAXIMUM SIZE FOR AN I/O REQUEST WHICH WILL NOT
	;[207] CAUSE PROBLEMS WITH THE PAGE FAULT HANDLER. RETURNS T1/ NUMBER
	;[207] OF WORDS (MULTIPLE OF 1000), PRESERVES ALL OTHER ACS ROUTINE
	%IOSIZ:	PUSH	P,T4			;[207] SAVE AN AC
		HRROI	T4,.GTVRT		;[207] GET VIRTUAL SIZE INFO
		GETTAB	T4,			;[207]
		  SETZ	T4,			;[207]
		HRROI	T1,.GTSGN		;[207] GET HISEG INFO
		GETTAB	T1,			;[207]
		  SETZ	T1,			;[207] GENERATE BOGUS VALUE IF IT FAILS
		TLNE	T1,(SN%SHR)		;[207] IS SEGMENT SHARABLE?
		TDZA	T1,T1			;[207] SHARABLE, DON'T COUNT HISEG SIZE
		LDB	T1,[POINT 9,T4,26]	;[207] GET NUMBER OF HISEG PAGES
		ANDI	T4,777			;[207] ISOLATE NUMBER OF LOSEG PAGES
		ADD	T4,T1			;[207] ADD TOGETHER FOR VIRTUAL SIZE
		HRROI	T1,.GTSWP		;[207] GET SWAPPING (PHYSICAL) SIZE
		GETTAB	T1,			;[207] FROM MONITOR
		 SETZ	T1,			;[207] IF IT FAILS, GENERATE A
						;[207] BOGUS VALUE
		ANDI	T1,777			;[207] ONLY NUMBER OF PAGES
		CAMG	T4,T1			;[207] IS VIRTUAL SIZE GREATER
						;[207] THAN PHYS?
		 JRST [	SETZ T1,		;[207] NO
			JRST %IOSI3]		;[207] RETURN WITH FLAG TO DO TRANSFER
		HRROI	T1,.GTCVL		;[207] CURRENT MEMORY LIMITS
		GETTAB	T1,			;[207] ASK THE MONITOR
		 SETZ	T1,			;[207] ZERO
		TRZE	T1,400000		;[207] LIMIT VS GUIDELINE BIT SET?
		TRNN	T1,-1			;[207] DO WE HAVE A LIMIT SET?
		TRNA				;[207] NOPE, TRY FOR ACCOUNT LIMIT
		JRST	%IOSI2			;[207] HAVE A LIMIT. USE IT.
		HRROI	T1,.GTMVL		;[207] ACCOUNT MEMORY LIMITS
		GETTAB	T1,			;[207] ASK THE MONITOR
		  SETZ	T1,			;[207] THIS MONITOR HAS PROBLEMS.
		TRNN	T1,-1			;[207] PHYSICAL LIMIT SET?
		JRST	T1,%IOSI2		;[207] YES, USE THIS ONE
		MOVX	T1,%NSCMX		;[207] CORMAX
		GETTAB	T1,			;[207] ASK FOR MAX LIMIT ON ALL JOBS
		  SETZ	T1,			;[207] SICK MONITOR
		LSH	T1,-^D9			;[207] MAKE IT PAGES
	%IOSI2:	TLZ	T1,-1			;[207] CLEAR LEFT HALF
		LSH	T1,^D9			;[207] MAKE INTO WORDS
		SUBI	T1,SLOSH		;[207] SLOSH FACTOR. SEE BELOW.
		CAIL	T1,BIGXFR		;[207] DON'T ALLOW LARGER THAN THIS
		MOVEI	T1,BIGXFR		;[207] MAX
		CAIG	T1,1000			;[207] DON'T ALLOW LESS THAN THIS
		MOVEI	T1,1000			;[207] MIN
	%IOSI3:	POP	P,T4			;[207] RESTORE SCRATCH AC
		POPJ	P,			;[207] RETURN
	SLOSH==7*1000				;[207]
	BIGXFR==24*1000				;[207]
	;[207] SLOSH FACTOR ABOVE IS TO ALLOW FOR:
	;[207]		2 PAGES PFH
	;[207]		1 PAGE WITH PC OF FILOP
	;[207]		1 PAGE WITH PSI VECTOR
	;[207]		1 PAGE WITH JBINT VECTOR
	;[207]		1 PAGE JOBDAT
	;[207]		1 PAGE SLOSH

	;[207] IF WE EVER NEED A LARGER SLOSH VECTOR, I'LL BE SURPRISED. IT'S
	;[207] POSSIBLE BY MAKING PSI VECTOR AND JBINT BLOCK BE ON PAGE
	;[207] BOUNDARIES AND HAVE THE IO NOT BE ON PAGE BOUNDARIES, BUT I'M
	;[207] NOT GOING TO WORRY ABOUT IT.

	;[207] BIGXFR IS SET TO 24 PAGES, WHICH IS TO AVOID TOO MANY PAGE
	;[207] FAULTS ON THE SAME UUO AT ONCE. SEE TSTDMP+4 IN PFH. NOTE THAT
	;[207] INCREASING THE NUMBER IN PFH WOULD ALLOW INCREASING THIS
	;[207] NUMBER, BUT WOULD SHOW UP AS A PERFORMANCE HIT IN ORDINARY DUMP
	;[207] MODE IOWD BREAKDOWN.

 REP 30/56	;07C16
		MOVX	T1,FO.ASC		;[100] ALLOCATE AN EXTENDED CHANNEL
 WIT
		MOVX	T1,FO.PRV+FO.ASC	;[210] ALLOCATE AN EXTENDED CHANNEL
 INS 15/58	;07C17
		TXO	T1,FO.PRV		;[210] ASK FOR PRIVS IF WE'VE GOT THEM
 REP 9/59	;07C18
		JRST	LOGCLX			;[100] THEN JUST STOP LOGGING
 WIT
		 JRST	LOGCLX			;[210] THEN JUST STOP LOGGING
		MOVX	T1,FO.PRV		;[210] WANT TO USE PRIVS
		IORM	T1,LFOREL+.FOFNC	;[210] PUT INTO BLOCK
 REP 15/60	;07C19
		-1,,-1				;[201] DEFAULT NUMBER OF BUFFERS
 WIT
		-1,,0				;[205] DEFAULT NUMBER OF BUFFERS
 REP 24/67	;07C20
	;**; Find out if spec is user's terminal, and set .OVRLO to -1,,.PRIOU if so.
	;**; If so, release the JFN too.
 WIT
	; Find out if spec is user's terminal, and set .OVRLO to -1,,.PRIOU if so.
	; If so, release the JFN too.
 SUM 121063