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The Adesse Corporation



VM System Product

CP INTERNALS



Richard Alexander

Larry Chace

Bob Cowles
INTRODUCTION


This manual is a companion to the Adesse Corporation's VM
System Product CP Internals course. The course has been de-
veloped by practicing system programmers and is intended for
system programmers who have a basic familiarity with VM/SP.
We hope this document strikes the right balance between two
competing needs: on the one hand we would like to present
the material such that a beginning programmer could benefit
from it, and on the other hand we would like to be of help
to the veteran programmer. It is clearly impossible for a
manual of this size to completely address both kinds of
needs.
The first three chapters concentrate on an overview of
the hardware and software architectures exploited by CPo A
bas ic understanding of the total system archi tecture wi 11
help you as we then move on to the more specific topics
that follow. Most of the manual is concerned with detailed
descriptions of the major parts of CPo The control blocks,
the modules, and the algorithms are covered to a degree of
detail that we hope is appropriate in each case. The final
part of the manual covers topics that are more general in
nature; that is, they involve several of the previous de-
tailed topics.
You should be familiar with IBM System/370 architecture.
We assume that concepts such as DAT, I/O interrupts, and
DASD are familiar to you, although we do review such con-
cepts in the first chapter. We also assume that you are ba-
sically familiar wi th the workings of an interrupt-driven
timeshared operating system.
We hope that this book will be of value to you. The spe-
cific information is based upon VM/SP Release 2 and in many
cases has been updated to release 3 with HPO. As with any
subject as complex as CP, mistakes are unavoidable; we would
be appreciative if you would report any errors to the Adesse
Corporation at the following address:
The Adesse Corporation
Post Office Box 607
Ridgefield, Connecticut 06877
Tel: 203-431-3071
May 31, 1985


iii -
CONTENTS


INTRODUCTION . . . . . ....... ...... . .. iii

PART I General Architecture

Chapter page
1. SYSTEM/370 ARCHITECTURE 3

Introduction . .