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