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.IF NE FT.MOP

;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED
;  OR COPIED ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
;
;COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1978,1979,1980,1981,1984,1988.
;ALL RIGHTS RESERVED.


; MOP MODE FUNCTION CODE DEFINITIONS
;
M.PRMD=4.			;REQUEST MEMORY DUMP
M.PEMM=6.			;ENTER MOP MODE
M.PMMR=12.			;MOP MODE RUNNING
M.PMDP=14.			;MEMORY DUMP DATA
MOPDTY==12.			;MOP DEVICE CODE
KISAR0=172340			;MAP REGISTER
REBOOT==173004			;ADDRESS OF THE DECNET ROM
MOPBSZ=374			;MAX SIZE OF DUMP DATA

MOPDMP:	MOV	FLBDMC+LB.SLA,R1;BOOT FROM THE FIRST DMC
	MOV	#MOPPDL,SP
	CLR	R0		;START AT ZERO
	MOV	#10$,@#4	;HAVE NXM'S COME HERE
6$:	TST	(R0)		;CHECK IF LOCATION EXISTS
	ADD	#2,R0		;NEXT ADDRESS TO CHECK
	CMP	R0,#160000 	;MAXIMUM
	BNE	6$		;CONTINUE CHECKING
10$:	MOV	R0,MOPMSZ	;STORE MEMORY SIZE IN MMR MSG

MOPINI:	MOV	#MOPPDL,SP		;INIT THE STACK
	JSR	PC,MOPDIN	;INIT THE DMC
	MOV	#MOPMMR,R4	;MOP-MODE-RUNNING MSG
	MOV	#MOPMML,R2	;LENGTH OF SAME
	JSR	PC,MPDXMT	;SEND IT OUT
	 BNE	MOPINI		;FAILED, START OVER

MOPRCV:	MOV	#MOPMSG,R4	;RECEIVE BUFFER
	MOV	#7,R2		;RECIEVE BUFFER LENGTH
	MOV	#1,MOPTMR	;TIME THIS OUT
	JSR	PC,MPDRCV	;GO RECIEVE A MSG
	 BNE 	MOPINI		;FAILED,START OVER
	CMPB	#7,R2		;BETTER BE 7 BYTES
	 BNE	MOPXIT		;NOT SO
	CMPB	#M.PRMD,MOPMSG	;PROGRAM DUMP REQUEST?
	 BNE	MOPINI		;NO
	MOV	MOPMSG+5,R0	;REQUESTED DUMP COUNT
	MOV	R0,-(SP)	; AND REMEMBER IT
	MOV	MOPMSG+1,R3	;WHERE TO START DUMPING
	MOV	#MOPMSG+5,R2	;WHERE TO MOVE THE DUMP DATA
20$:	MOVB	(R3)+,(R2)+	;MOVE TO MSG
	DEC	R0		;DECREMENT COUNT
	BNE	20$		;DO UNTIL DONE
	MOV	(SP)+,R2	;COUNT FOR DMC DRIVER
	ADD	#5,R2		;ACCOUNT FOR FCN AND ADDRESS
	MOVB	#M.PMDP,MOPMSG	;SET THE FUNCTION CODE
	MOV	#MOPMSG,R4	;ADDRESS OF MESSAGE TO SEND
	JSR	PC,MPDXMT	;GO SEND IT
	 BNE	MOPINI		;FAILED , RESTART
	BR	MOPRCV		;LOOP
MOPXIT:	CMPB	#M.PEMM,MOPMSG	;ENTER MOP MODE?
	BNE	MOPINI		;NO
	JMP	@#REBOOT	;TRIGGER ROM

;MOPDIN - DEVICE INITIALIZATION
;CALL	R1 := CSR ADDRESS OF DMC
;	JSR	PC,MOPDIN
MOPDIN:	CLR	MOPTMR
	
MOPDI1:	BIS	#40000,(R1)	;MASTER CLEAR DMC
	MOV	#100000,(R1)	;TURN DMC ON
	MOV	#BASE,R4	;GET BASE ADDRESS
	CLR	R3		;NO HI ORDER ADDRESS BITS
	MOVB	#43,(R1)	;RQI + BASE
	JSR	PC,MOPTIN	;GIVE TO DMC
	MOV	#2400,R3	;SET MOP & HALF DUPLEX
	CLR	R4		;FILLER REG
	MOVB	#41,(R1)	;RQI + CNTLI
;	PJSP	MOPTIN		;DO THE CONTROL OUT AND RETURN

;MOPTIN	ROUTINE TO PERFORM AN INPUT TRANSACTION TO THE DMC
;CALL	R4 = CSR 4
;	R3 = CSR 6
;	JSR	PC,MOPTIN	;RETURNS WITH RTS
MOPTIN:	TSTB	(R1)		;RDYI SET ?
	BMI	10$		;YES
	TSTB	2(R1)		;RDYO SET ?
	BPL	MOPTIN		;NO
	JSR	PC,MPDOUT	;CHECK COMPLETION
	BR	MOPTIN		;AGAIN
10$:	MOV	R4,4(R1)	;TO FIRST HALF DMC PORT
	MOV	R3,6(R1)	;TO SECOND HALF DMC PORT
	BIC	#40,(R1)	;CLEAR RQI-GIVE TO DMC
20$:	TSTB	(R1)		;RDYI CLEAR ?
	BMI	20$		;NOT YET
	CLZ			;FORCE AN ERROR RETURN CONDITION
	RTS	PC		;RETURN TO CALLER

; MPDRCV-RECEIVE A BLOCK FROM THE DEVICE
; MPDXMT-TRANSMIT A BLOCK ON THE DEVICE
;
; INPUTS:
;	R1 = CSR ADDRESS
;	R2 = MAXIMUM BLOCK LENGTH TO RECEIVE, OR
;	     BLOCK LENGTH TO TRANSMIT
;	R4 = ADDRESS OF THE MESSAGE
; OUTPUTS:
;	Z-BIT SET:
;	R2 = ACTUAL LENGTH OF BLOCK RECEIVED
;	(SP) = BUFFER ADDRESS
;
;	Z-BIT CLEAR:
;	AN ERROR WAS DETECTED ON THE DEVICE
;	THE STACK IS AS DESRIBED ABOVE
	.ENABL	LSB
MPDRCV::MOVB	#44,(R1)	;RQI + BA/CC + RCV
	BR	10$		;
	
MPDXMT::MOVB	#40,(R1)	;RQI + BA/CC + XMT
10$:	CLR	R3		;CLEAR FIRST TO ZERO ADDRESS HI BITS
	BIS	R2,R3		;SET BUFFER SIZE
	JSR	PC,MOPTIN	;GIVE TO DMC
	CLR	R5
	MOV	R3,-(SP)
	MOV	#10.,R3		;IN CASE WE NEED LOOP
20$:	TSTB	2(R1)		;TEST RDYO SET
	BMI	21$
	TST	MOPTMR		;NOT YET, NEED TIMER?
	BEQ	20$		;NO
	DEC	R5		;YES
	BNE	20$
	DEC	R3
	BNE	20$		;
	BR	MPDOT1

;	CHECK COMPLETION FROM DMC-11

21$:	CLR	MOPTMR
MPDOT1:	MOV	(SP)+,R3
MPDOUT:	MOV	6(R1),R2	;GET LENGTH OR ERROR BITS
	BIC	#140000,R2	;CLEAR MEMORY ENTENSION BITS
	TST	MOPTMR		;TIMER ERROR?
	BEQ	22$		;NO
	CLR	MOPTMR		;YES, CLEAR IND.
	BR	MOPDI1
22$:	BITB	#3,2(R1)	;BA/CC OR CTLO
	BEQ	30$		;IF EQ, BA/CC COMPLETION
	BIT	#1730,R2	;IS IT FATAL ERROR ?
	BNE	MOPDI1		;IF NE, CLEAR AND REINITIALIZE THE DEVICE
	
30$:	CLRB	2(R1)		;CLEAR RDYO (SETS Z-BIT)
	RTS	PC		;RETURN
	.DSABL	LSB

	.SBTTL	DATA
MOPTMR:	.WORD	0		;TIMER INDICATOR FOR PANIC
	.BYTE	0		;ALLIGN
MOPMMR:	.BYTE	M.PMMR		;MOP-MODE-RUNNING CODE
	.BYTE	MOPDTY		;DEVICE TYPE, SHOULD BE DMC
	.BYTE	1		;MOP VERSION #
MOPMSZ:	.WORD	0,0		;MEMORY SIZE IN BYTES
	.BYTE	2		;FEATURES SUPPORTED
	MOPMML=.-MOPMMR		;LENGTH OF MOP-MODE-RUNNING MESSAGE

;AREA TO READ/WRITE FROM
MOPMSG:	.BLKB	MOPBSZ+5	;FUNCTION, ADDRESS & DATA
MOPPDL:	.BLKW	10		;STACK
BASE:	.BLKB	200		;DMC BASE TABLE

.ENDC; FT.MOP