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Special Function

#6

Paging

Queue

and

Paging Error

Interrupt

Service

General

Description

I

Code

Format

Condition

Code

Interrupt Action

Notes

Privileged

Instructions

•

This

Special

Function

determines

all

the

segment

and

page

addresses

specified

by

the

instruction

whose

Translation

Table

elements

caused

or

might

cause a

Paging

Queue condition

or

Paging

Error

Interrupt

condi-

tion

and

adjusts

the

NIA

field

of

the

P

counter

in

the

suppressed

program

state.

It

interfaces

with

the

program

by

stacking

a

list

of

addresses

(page

and

segment)

with

applicable

program

indicators

to

identify

the

status

of

each.

The

address

of

the

beginning

of

the

stack

(up

to

eight

halfwords

per

stack)

of

the

effective

address

list

is

indicated

by

the

contents

of

the

memory

location

addressed

by

the

address

field

of

the

Function

Call

instruction.

• 01.

Base

Displacement

o 3 4 15

(Address

of

the

beginning

of

the

up

to

eight

halfword

stack

for

the

effective

address

list.)

•

Unchanged.

•

Power

Failure.

Machine

Check.

•

1.

This

Special

Function

can

be used

to

analyze

those

interrupts

that

can

occur

during

staticizing

or

execution.

The

NIA

field

of

the

object

P

counter

and

the

ILC

are

set

correctly

to

permit

this

Special

Function

to

back-up

the

object

P

counter

for

reentry

to

the

object

instruction

following completion

of

the

page

calling.

2.

An

index

is

provided

in

General

Purpose

Register

15

of

the

current

state.

This

index

is

the

number

of

virtual

addresses

in

the

stack

minus

one

times

2;

i.e., 0 is

equivalent

to

1

address

and

14

is

equivalent

to 8 addresses.

The

addresses

of

the

stack

are

either

virtual

or

actual,

depending

on

the

status

of

the

appropriate

D

bit

settings,

D = 0

and

D = 1 respectively.

3.

The

size

of

the

address

stack

is

a

function

of

the

instruction

type

as

follows:

Range of

Format

Number

of

Stack Addresses General Purpose

Register

15

RR

1

(instruction)

0

RS

1-3

(up

to

2

instruction

and

1

operand)

0-4

*RX

1-3

(up

to

2

instruction

and

1

operand)

0-4

SI

1-3

(up

to

2

instruction

and

1

operand)

0-4

SS

1-6

(up

to

2

instruction

and

4

operand)

0-10

*

If

the

instruction

is

an

Execute,

the

number

of

stack

addresses

is

1

to

8

(up

to

4

instruction

and

4

operand)

and

the

range

of

General

Purpose

Register

15

is

0-14, depending on

the

format

of

the

object

instruction.

99

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