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iAPX
432
Interface
Processor
Architecture
Reference
Manual
Having
established
its
identity,
the
processor
proceeds
to
locate
its
processor
object.
It
does
this
by assuming
that
the
initial
object
table
directory
is
located
at
physical
mennry
address
8
(see
figure
E-I).
A segment
header
field
of
eight
bytes
precedes
the
initial
object
table
directory.
It
further
asstmles
that
the
first
storage
descriptor
in
the
directory
locates
an
object
table
containing
storage
descriptors
for
processor
objects.
Using
its
processor
ID
as
an
index,
the
processor
selects
the
storage
descriptor
from
the
object
table
which
locates
its
processor
object.
After
qualifying
its
processor
object,
the
IP
is
able
to
find
its
localoomnuncation
segment,
where
it
examines
the
IPC
message
field.
Now
in
logical
reference
mode,
the
IP
can
respond
to
the
IPC message and
per
form
all
normal
operations.
As
usual,
an
IP
will
generate
an
interrupt
after
it
responds
to
the
IPC message.
This
second
interrupt
following
reset
indicates
to
the
IP
controller
software
that
the
IP
is
in
logical
reference
mode
and
that
normal
execution
may
begin.
Note
that
window 4
will
then
be
configured
as
defined
by
the
attributes
encoded
in
the
IP's
processor
object.
Since
window 4
provides
the
data
path
to
the
function
request
facility,
the
other
windows may
be
configured
inmediately
by
means
of
the
ALTER
MAP
AND
SELECI'
mTA
SEGmNr
function.
E-6