Type ASSEMBLE
Source Lines : 936
Fixes Applied : 21
Most Recent Version : Thursday, December 14, 1978
Last Fix ID : [R14370DK]
Module
DMKVSI
Function
TO SIMULATE THE OPERATION OF PRIVILEGED I/O INSTRUCTIONS
ISSUED BY VIRTUAL MACHINES
Attributes
REENTRANT, RESIDENT, ENTERED VIA GOTO FROM DMKPRVLG FOR THE
SIMULATION OF AN INSTRUCTION
Operation
1. SET CONDITION CODE IN VIRTUAL PSW TO ZERO
2. CALCULATE VIRTUAL UNIT ADDRESS USING REGISTER AND DISPLACE-
MENT VALUES PASSED BY PRIVILEGED IN VMINST
3. CALL DMKSCNVU TO LOCATE VCHBLOK, VCUBLOK, AND VDEVBLOK,
AND SAVE THE RESULTING CONDITION IN GPR0
4. BRANCH TO HANDLE SIO, TIO, AND TCH, DESCRIBED
IN SECTIONS A-C RESPECTIVELY.
5. BRANCH TO DMKVSJ FOR SUBROUTINES AND EXIT PROCESSING
AND TO SIMULATE HIO AND CLCH
Calls to Other Routines
DMKCCWTR - TO TRANSLATE THE USER'S CHANNEL PROGRAM
DMKFREE - TO OBTAIN FREE STORAGE FOR IOBLOKS
DMKFRET - TO RETURN USED IOBLOKS TO FREE STORAGE
DMKIOSQV - TO SCHEDULE THE VIRTUAL OPERATION
DMKVCAST - TO SIMULATE A START I/O TO A VIRTUAL CTCA
DMKVCATS - TO SIMULATE A TEST I/O TO A VIRTUAL CTCA
DMKSTKIO - TO STACK AN INTERRUPT DUE TO THE COMPLETION OF A
VIRTUAL ENABLE CAUSED BY A HIO
DMKDSPCH - EXIT VIA GOTO AFTER I/O IS SCHEDULED BY DMKIOSQV
DMKVCNEX - EXIT VIA GOTO TO SIMULATE VIRTUAL 1052 CONSOLE
DMKVSCVR - TO VERIFY THAT THE NOTRANS OPTION IS VALID
DMKVSPTO - TO SIMULATE A TIO TO A UNIT RECORD INPUT DEVICE
DMKSCHDL - TO DROP A USER FROM Q
DMKVIOC1 - TO REFLECT CONDITION CODE 1 CSW STATUS
DMKVIOIN - IOB INTERRUPT RETURN ADDRESS (IOBIRA)
DMKVSJEX - TO HANDLE HIO AND CLCH AND SUBROUTINES