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CI3JECrS
AND
OPERATORS
Table 2-1
IP/GOP
System Object Comparison
Object
Processor Object
Process
Obj
ect
Context Object
Operand Stack
Instruction
Segment
Object
Table
IkInain
Port
Carrier
Storage Resource
Type
Definition
Communication Segment
Descriptor
Controller
Refinement
Controller
Legend:
IP
Implementation-
similar
similar
similar
none
none
identical
identical
identical
identical
none
identical
identical
identical
identical
IP and
GOP
~lementations
are
identical
identical
similar
While
conceptually
similar,
IP
implements
object
differently
than
GOP
none
IP does
not
implement
object
IP
OPERATORS
Table
2-2
compares
the
operators
available
in
the
IP's
function
set
to
those
provided
in
the
GOP's
instruction
set.
Since
windows
are
unique
to
Interface
Processors,
the
ALTER
MAP
AND
SELECr
DATA
SEGMENT
function
has
no
counterpart
in
the
GOP.
Conversely,
the
IP
has
no
functions
for
performing
arithmetic
(except
for
the
exclusion
function
INDIVISIBLE
ADD
SHORI'
ORDINAL)
or
logical
operations
on
numeric
or
character
data
types,
nor
any
operators
to
alter
the
flow
of
execution
(e.g.,
branch
or
call
functions).
To
the
extent
that
these
classes
of
operators
are
needed
in
a
Peripheral
Subsystem
interface,
they
can
be
provined
by
the
cornbinatlon
of
the
Attached
Processor's
instruction
set
and
the
IP's
window
facility.
For
example,
by
opening a
windCM
on a message
received
fran
a
GOP
process,
the
I/O
controller
can use
AP
instructions
to
test
and
branch on
the
value
of
a message
field
read through
the
window.
2-3