Any information pertaining to the IBft 3284 or 3286 also pertains to the IBM 3287,
3288 and the 3289 printers, unless
otherwise noted. PREREQUISITE PUBLICATIONS lBft [§gility/370 Order No. GC20-1800 Guide, Order No. GC20-1806 Terminal GC20-1810 COREQUISITE PUBLICATIONS Order No. Sys!n Order No. GC20-1801 Order No. GC20-1808 OLTSEP and Error R!i!£Qrd!jlg Order NO.-GC20-1809- Service Routines 199ic, Order tata Areas and Control Blo£! 199if, Order No:-5Y20-0884------ In addition, for EREP processing the
following OS/VS Library publications are
required: Rec,grding Editing Order Environmental Rec,grding Editing printing (EREP) Program Logic, Order SY28-0773 gnd No. gnd No. If the
attached,
required: IBft 3850 Mass Storage system is
the following publications are OS/VS ftessage Library: ]!§§ Order No. GC38-1000 IEM 385C Mass system (MSS) of Thecry, Order No. GA32-0035 IEM 3850 Mass system (]SS) prI!!ciple§ of Order No. GA32- C036 SUPPLEMENTARY PUBLICATIONS l]A principles cf Order No. GA22-6821 I'E! principles Order No. GA22-7000 IEM lnf2Intion Diillll 2I§!em Crder No. GA27-2749 Information Synchronous Order No. GA27-3004 iv IBM VM/370 System Logic and Problem Determination--Voluae 1

SUMMARY OF AMENDMENTS. CP INTRODUCTION •••• VM/370 • • • • • • • • Introduction to the VM/310 Control Program • • • • • • • • • • • • virtual Machine Time Management. Virtual Machine Storage Management • Virtual Machine I/O Management. Spooling Functions • Spool File Recovery. CP Commands. USING PROCESSOR RESOURCES. Queue 1. • • ••• Queue 2. • • • • • • • FUNCTIONAL INFORMATION PERFORMANCE GUIDELINES
General Information. • Virtual Machine I/O •• Paging Considerations.
Locked Pages Option.
Reserved Page Frames Option. • • • • Virtual=Real Option. Preferred virtual Machines Favored Execution. • Priority • • • • • • Reserved Page Frames ••• • Virtual=Real • • • • • • • • • Affinity • • • • • • • _ • • • • Virtual Assist Featnre VM/370 Extended Control-Program Support (ECPS). • • • • • • • • • • Virtual Machine Communication Facility
Special Messages Facility ••••• VM/VS Handshaking ••••• CP INTERRUPTION HANDLING • Program Interruption • • • Privileged Instructions. • • I/O Privileged Instructions. • • Non-I/O Privileged Instructions ••• DIAGNOSE Instruction in a Virtual Machine • • • • • • • • I/O Interruption • • • • • Machine Check Interruption SiC Interruption • • • • • External Interruption. • • • Timer Interruption • • • • • • • • • External Interruption. • Extended Virtual External
Interruptions • • • • • _ • • • • • System Support • • • • • • • • • • • • Free Storage Management. • • • Storage Protection • • • • • • Executing the Pageable Control Program • • • • • • • • • • • • • ix
.1-1
.1-3
.1-3
.1-4
.1-4
.1-6
.1=7
.1-8
.1-9 1-10 1-11
1-11
1-11
1-13
1-25
1-25
1-26
1-27
1-28
1-29
1-29 1-30 1-30 1-32
1-32
1-32
1-34
1-35
1-37
1-39 1-40 1-43
1-46
1-46
1-46
1-46
1-47
1-49
1-73
1-73
1-74
1-76
1-76
1-76
1-76
1-71
1-11
1-77
1-18
Contents System Support Modules • • • 1-79
Control Register Usage • • • • • 1-19
Restrictions and Conventions for Pageable CP Modules • • • 1-79
Data Area Modules. • • • • 1-80 Virtual Timer Maintenance. 1-81 I/O Management • • • • • • • 1-83 I/O Supervisor • • • • • • 1-83
Real I/O Control Blocks. • • •• 1-83 Virtual I/O Requests • • • • • • 1-84 I/O CO:Fonent States • • 1-89 I/O Interruptions. • • • • 1-90 Virtual I/O Interruptions. 1-90 Scheduling I/O Requests. • 1-91 Virtual Console Simulation • • • 1-96 Remote 3210 Program.ing ••••••• 1-97 I/O Programs for Bisynchronous Lines
and Remote 3270s. • • • • • • • 1-99 tata Formats -Bisynchronous Lines
and Remote 3210s •••••••••• 1-103 Allocation Management. • • .1-105 Normal Paging Requests. • • .1-105 DASD Storage Management. • .1-111 Paging I/O. • • • ••••• 1-113 Paging Subsystem. • • • • • • .1-114 Page Replacement and Page Selection Algorithm ••••••••••••• 1-114
Backing Store Allocation Algorithm .1-115 Page I/O Request Queueing Algorithm •••••• Virtual Storage Paging Error .... 1-116
Recovery. • • • • • • • • • .1-116 Virtual Relocation. • • .1-117
Free Storage Management. • .1-120 CP Initialization. • • • • • .1-122
Initialization and Termination ••• 1-123
Console Functions. • • • • • •• 1-127
Dispatching and Scheduling. • .1-128
Cp Spooling •••• c e • • • .1-136
Spool Data and File Format. • .1-137
Spool Buffer Management. • • • .1-138 Virtual Spooling Manager (DMKVSP) •• 1-139
Real Spooling Manager (DMKRSP) .1-142
Spooling Commands •••••••••• 1-144
Spool File Error Recovery •••••• 1-148
Recovery from System Failure •••• 1-149
Recovery Management Support (RMS) •• 1-149 System Initialization for RMS •••• 1-150 Overview of Machine Check Handler •• 1-150 System/310 Recovery Features •••• 1-151 Overview of Channel Check Handler •• 1-157
Channel Control Subroutine ••••• 1-158
Individual Routines ••••••••• 1-159
Error Recording Interface for Virtual Machines. • • • • • • .1-161
Error Recording and Recovery •••• 1-162
Error Record Writing •••• e ••• 1-162
DASD Error Recovery, ERP (DMKDAS) •• 1-163
Alternate Track Recovery, ERP (DMKTRK). • • • • • • • • • • • • .1-166
Tape Error Recovery, EBP (DMKTIP) •• 1-170 3210 Remote Support Error Recovery .1-171
contents v