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CEJECrS
AND
OPERATORS
Table
2-3
Direct/lndirect
Accessibility
Viewpoint
of
IP/GDP
in
432 System
.
Directly
Accessible
432
Infor.mation
o
access
descriptors
All
access
descriptors
in
the
four
Entry
Access
Segments.
o
data
All
objects
of
type
data
segment
referenced
b¥
access
descriptors
in
the
four
Entry
Access Segments.
Indirectly
Accessible
432
InfoLmation
o
Information,
data
or
access,
which
can
be
reached
via
access
path
manipllation
(i.e.
by
following
a
chain
of
access
descriptors
using
the
Enter
Access
Segment
function).
Viewpoint
of
AP
in
Peripheral
Subsystem
(Controlling
an
IP
operating
in
logical
reference
mode)
Directly
Accessible
432
Information
o
access
descriptors
tmE,
the
AP
cannot
directly
alter
access
infor.mation.
o
data
all
objects
of
type
data
segment
for
which a
windCM
is
currently
opened.
Note,
this
~lies
the
object
is
directly
accessible
to
the
IP.
Indirectly
Accessible
432
Information
o
Objects
of
type
data
segment which
are
directly
accessible
to
the
IP
rut
which have
not
been
mapped.
through
a window.
These
objects
can
be made
directly
accessible
by
issuing
an
IP
function
request
which
opens
a
windCM
to
the
object.
o Access·
descriptors
in
the
Entry
Access Segments. These
can
never
be made
directly
accessible
to
the
AP
but
can
be
manipulated
via
the
IP
function
request
facility.
o
Information,
data
or
access,
which
can
be
reached
via
access
path
manipulation
(i.
e.
by
following
a
chain
of
access
descriptors
using
the
Enter
Access
Segment
function
provided
by
the
IP
function
request
facili
ty)
• Note
that
two
levels
of
indirection
are
involved,
traversing
the
path
of
access
descriptors
and
the
use
of
the
IP
function
request
facility.
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