Type ASSEMBLE
Source Lines : 921
Fixes Applied : 15
Most Recent Version : Thursday, December 7, 1978
Last Fix ID : [HRC013DK]
Module
DMKVIO
Function
TO RECORD AND TRANSLATE THE INTERRUPTS AND STATUS ASSOCIATED
WITH VIRTUAL I/O OPERATIONS
Attributes
REENTRANT, RESIDENT, ENTERED VIA GOTO FROM DMKDSP WHEN
AN IOBLOK FOR A VIRTUAL INTERRUPT IS UNSTACKED
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, TCH, AND HIO, DESCRIBED IN
SECTIONS A-D RESPECTIVELY
Calls to Other Routines
DMKPTRAN - LOCATE THE USER'S PAGE 0
DMKUNTFR - TO RETURN THE TRANSLATED CHANNEL PROGRAM TO FREE
STORAGE
DMKFREE - TO OBTAIN FREE STORAGE FOR IOBLOKS
DMKFRET - TO RETURN USED IOBLOKS TO FREE STORAGE
DMKUNTRN - TO UNTRANSLATE THE REAL CSW ADDRESS ASSOCIATED WITH
A VIRTUAL INTERRUPT
DMKDSPCH - EXIT VIA GOTO AFTER I/O IS SCHEDULED BY DMKIOSQV
DMKSCNVU - LOCATE VIRTUAL CHANNEL, CU, AND DEVICE BLOKS
DMKPTRUL - TO UNLOCK A PAGE
DMKTRDWT - TO SYNCHRONIZE TRACE ACTIVITY
DMKTRDSI - TO TRACE AN I/O OPERATION (SIO, TIO, HIO, OR TCH)
DMKTRCSW - TO TRACE A CSW INTERRUPT
DMKCCHRF - TO REFLECT CHANNEL ERROR TO VIRTUAL MACHINE