CLC 30B,C CLEAR CARD SPC 2
* THE BELOW CODE SERVES AS AN EXAMPLE OF HOW PRIVILEGED DRIVERS
* MAY COMPLETE A REQUEST TO THE OPERATING SYSTEM WITH MINIMUM LATENCY SPC 1
CLC 4 INTERRUPTS OFF
* UPDATE SYSTEM FLAGS – ”T” WOULD BE MEANINGLESS LDB IFT7 ADDR OF IFT7
* ENQUEUE THIS IFT ON ”$Q.PV” QUEUE OF PRIVILEGED IFTS REQUIRING
* PHYSICAL DONE PROCESSING SO THAT I/O SYSTEM WILL PERFORM A P.D.
* FOR THIS IFT RATHER THAN RETURN IMMEDIATELY TO USER PROGRAM
* WHEN THE CURRENT SYSTEM PROCESS COMPLETES.
* IF THIS IS A PROBLEM, THE PRIVILEGED DRIVER
* SHOULD RUN WITH INTERRUPTS OFF. THE TBG TICK
* WILL THEN BE DELAYED (NOT LOST).
*
OTA 0 UNMASK ALL INTERRUPTS
&:22222* 2
* HERE WHEN MEMORY PROTECT WAS ON SO THAT I/O SYSTEM
* CAN BE ENTERED DIRECTLY FOR PHYSICAL DONE
* ENTER IOC WITH B REGISTER POINTING TO THE IFT WORD 1 STC 4 INTERRUPTS ON
* 2 22222&.
CLC 30B,C ENSURE PR DISABLED CLA
JMP ID.51,I PHYSICAL DONE EXIT SPC 3
* TIME–OUT TMOUT LDA B3
JMP DONEX+1 RETURN ERROR 3 SPC 3
* DATA AREA IFT7 NOP IFTX NOP DVT16 NOP BUFAD NOP NEGAD NOP NRANG NOP
#WD NOP
*
WMAP NOP EOSV NOP QSAV NOP ZSAV NOP GLOBL NOP MPFSV NOP INTMASK NOP
*
#MEAS DEC 0,0 MEASX DEC 0,0
*
B1 OCT 1 B2 OCT 2 B3 OCT 3 B7 OCT 7 B4000 OCT 4000 B7700 OCT 7700
*
N6 DEC –6 BN7 OCT 140001
*
ASV BSS 2
*
END
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LIA 24B
CONT SZA,RSS REMOTE CONTROL INTERRUPT?
JMP CONT1 NO. CONTINUE PROCESSING CLA YES.
OTA 24B CLEAR INDICATOR REGISTER *
* PERFORM ESSENTIALLY THE SAME PROCESS AS IF * A POWER-FAIL RESTART. EXAMPLE BELOW.
*
PWRFL LDB $IF6,I GET AVAILABILITY SSB,RSS BUSY?
JMP BRK NO. RESET ANY ASYNCH INTERRUPTS EXPECTED.
LDA REDO RESTART REQUEST IN PROGRESS
STA $DV16,I DON’T DOWN,DON’T FLUSH,NO ERR MESS CLC ZIB,C
CLC 23B,C TERM ANY DMA SO NO CONFLICT ON REENTRY JSB STAT
CLA SYSTEM FLAGS = 0 JMP ID.XX,I ”DONE” EXIT.
*
REDO OCT 100077 ”D” BIT + ERROR CODE 63 *
CONT1 EQU *
* NORMAL PROCESSING CONTINUE HERE
03 @ CLA
OTA 24B
#%22222)8(2 2*,,
2" 2! 20 AA 2" 20
LIA/B XX Move card register to A/B register LIA/B XX,C Move and clear the flag
MIA/B XX Merge card register into A/B register MIA/B XX,C Merge and clear the flag
SFS XX Skip if the flag set SFC XX Skip if the flag clear STC XX Set device control
STC XX,C Set control and clear flag STF XX Set the flag
CLF XX Clear the flag
# 2" & & I 9&
# 2! & & F G ' H
& 9& 20
# 20 C
.(4- $ ' #$-($#( ,# 4.
LDA CNTRL Get control word
OTA 31B Output to card STC 30B,C Start device ...
*2"+ ,9&-2"
,9&- 2" @ SFS 30B Wait for data flag ready
JMP *–1
LIA 30B Now get data
,9&- @
STC 30B,C
C @ CLC 30B,C
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.(4- $ ' #$-($#( ,# ..
LDA CNTRL Get control word
OTA 31B Output to card
LDA DATA,I Get first data word OTA 30B Send to card
STC 30B,C Start the card going ...
C ,9&- 2"
4. @ ISZ DATA Increment the data pointer
LDA DATA,I Get next data word OTA 30B Send to the card STC 30B,C Restart the device ...
& @
CLC 30B,C Clear card control and flag bits
&
15& @
G *!
0" 15& (%' # 0! 15& ' #
00 & #
02 1 ' #
% 15&
* / + C 15&
C
#:22222)8(2 2*,,
)
/ / % 15& @ LDB $DV1 SET THE PORT MAP
JSB $SETR
IOR CNTL GET DMA CONTROL WORD
OTA 21B OUTPUT TO CONTROL REGISTER LDA ADDR GET ADDRESS OF MEMORY BLOCK OTA 22B OUTPUT TO DMA ADDRESS REGISTER LDA CNT GET DATA COUNT
OTA 23B OUTPUT TO DATA COUNT REGISTER STC 21B,C START DMA AND CLEAR INTERRUPT FLAG ...
...
CNTL BSS 1 SET UP BY PROGRAM TO DESCRIBE TRANSFER ADDR DEF BUFR POINTS TO STORAGE
CNT BSS 1 DATA COUNT STORED HERE AS NEGATIVE VALUE
K !2
/ K @ LDA PNTR GET ADDRESS OF CHAIN
OTA 20B TELL IT TO I/O CHIP
STC 20B,C CLEAR INTERRUPT FLAG AND START CHAIN
& 15&
CONT EQU 100000B CONTINUE SELF-CONFIGURATION CHAIN DEVCM EQU 040000B ISSUE DEV COM PULSE AFTER EA WD/BYTE BYTE EQU 020000B DATA COUNT IS IN BYTES
RES EQU 010000B OVERWRITE DATA COUNT WITH RESIDUE AT END CINT EQU 004000B INHIBIT DMA INTERRUPT FLAG
REM EQU 002000B USE REMOTE MEMORY
FOUR EQU 001000B THIS LINK IS A QUADRUPLET AUTO EQU 000400B DON’T WAIT FOR SRQ FROM DEVICE IN EQU 000200B TRANSFER IS TO MEMORY FROM DEVICE RELOC .... MUST BE OR’ED INTO CONTROL WORD BEFORE * STARTING THE TRANSFER
*
PNTR DEF BUFR *
BUFR ABS CONT+AUTO+RELOC DMA CONTROL: OUTPUT TRIPLET DEF DATA ADDRESS OF MEMORY BLOCK
CNT1 DEC –10 NEG OF WORD COUNT IN DATA *
ABS CONT+AUTO+IN+RELOC DMA CONTROL: INPUT TRIPLET DEF INPT ADDRESS OF INPUT BUFFER
CNT2 DEC –10 NEG # WORDS IN INPUT BUFFER *
ABS BYTE+AUTO+FOUR+RELOC DMA CONTROL:LAST LINK IS QUADRUP.
DEF CTRL THIS IS A CONTROL WORD FOR I/O CARD DEF DONE ADDRESS OF LAST BLOCK
)8(2 2*,,22222#.
DEF CNT3 BYTE COUNT OF BLOCK AT DONE BUFFER *
DATA BSS 10 OUTPUT DATA BUFFER INPT BSS 15 INPUT DATA BUFFER DONE BSS 5 FINAL BUFFER IN CHAIN ...
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