Module Baae DMTSML (cont.) DMTSTO DMTSVC DMTSYS DMTWIT Entry Points MSG PARMGET &TPPUT &TPGET COMSUP CERROR DMTSTO DMTSVC DMTSYS Dl!TVEC DftTilT RSCS Module Entry Point Directory
Function Prepares and sends requests to the specialized task REX to writes messages on the operator's console. Scans lines and tests for delimiter characters.
Takes a line and packs it into a teleprocessing buffer. When the buffer is filled, it is queued onto CUTBUF for
processing by COMSUP. Deblocks received telecommunications buffers into tasks
and queues the task onte the appropriate prccessors TCTTASK queue. Processes all I/O on the communications line. It deque­
ues TP buffers from OUTBUF for transmission and queues
received TP buffers onto the &INBUF queue for de­
blocking by TPGET. Analyses all errors on the communications line. The ap­
propriate corrective action is taken depending on the
type of error.
Reserves pages of free storage for use by calling task
programs. Task free storage pages by making the associated map byte zero in the main storage map.
This module is the MSUP interrupt handler and receives
control directly when an SVC interrupt occurs.
The common system control information area that is
shared by all task level functions of RSCS. All instal­
lation variable information used by an RSCS system is
reflected in the assembly of this module. This module
is the only module that must be assembled as part of an RSCS system generation.
Describes the fixed address storage utilization for MSUP, beginning at main storage address X'200'. System/370 architecture defies the first 512 tytes of
main storage and MSUP uses this area as it is defined.
This area is not included in the DMTVEC Mcdule to
facilitate initial system loading. This area is ini­
tialized by DMTINI at IPL time. Task programs call this module by a BAL instruction.
It synchronizes events by suspending the execution of a
task until another process in the system signals that
a specified event has comFleted. RSCS Directories 3-55
3-56 IBM VM/370: System Logic and Problem Determination--Volume 3
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