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SYSTEM
INITIALIZATION
Before
any
function
request
is
made by
the
IP,
enough
432
memory
must
be
initialized
to
allCM
Ip·
execution.
This
is
necessary
because
the
IP
will
attempt
to
update
the
segment maWed by
windCM
4
in
response
to
the
function
request.
Once
this
path
to
mennry
has
been
established,
windCM
I
can
be
opened
onto
another
32K
byte
segment
by
the
ALTER
MAP
AND
SELECr
PHYSICAL
SEGmNT
function
if
addi
tional
interconnect
catpOnents
need
to
be
referenced;
this
should
normally
be
necessary
only
in
very
large
systems.
If
a
system
employs
error
checking
and
correcting
memory
(EOC)
that
does
not
initialize
itself,
the
initializing
AP
can
initialize
it
if
the
memory
is
organized
in
units
eight
or
fewer
bytes
wide.
Window
o comes
up
in
block
node
set
for
a 64K
byte
transfer
starting
at
physical
address
O.
Any
data
written
through
this
window
(e.g.
all
zero
bits)
is
written
by
the
IP
in
eight-byte
blocks.
The window
can
be
moved
through
the
entire
mempry
space
in
64K
byte
segments.
Once
the
system
configuration
has
been
established,
the
interconnect
path
set
up and
memory
initialized,
the
initializing
AP
can
load
the
initial
execution
environment.
The
simplest
and
fastest
way
to
do
this
is
to
write
all
the
required
binary
images
through
window
O.
An
alternative
is
to
load
the
min~l
object
set
required
to
support
one
IP
in
logical
reference
mode,
am
possibly
one
GOP.
The
rest
of
the
environment
(other
processes,
etc.
)
can
then
be
loaded
in
logical
reference
mode
by
the
initializing
AP
working
alone,
or
under
the
direction
of
a
GOP
process.
This
approach
has
the
advantage
of
getting
the
system
into
logical
reference
mode
as
soon
as
possible,
where
operations
are
inherently
more
protected
than
in
physical
reference
mode.
E-
3.
SYSTEM
STARrUP
Each
processor
in
the
system
must be
started
independently
by
sending
it
a
startup
IPC
(the
first
local
IPC
after
INIT).
At
least
one
432
processor,
perhaps
its
CMn
IP,
must
be
started
by
the
ini
tializing
AP
using
the
SEND
TO
PRCXESSOR
function
(physical
node) • The
remaining
processors
must
be
star
ted
one
at
a
time,
and
this
can
be
done by
the
initializing
AP,
or
by
a
processor
already
started
by
it.
Note
that
the
initializing
AP
(as
well
as
all
IPs)
remains
in
physical
reference
mode
until
it
receives
a
startup
IPC.
GOPs
and
IPs
respond
to
the
startup
IPC
identically
except
that
the
IP
additionally
switches
to
logical
reference
mode. The
basic
response
is
to
first
qualify
its
execution
environment
and
then
to
interpret
the
IPC and
respond
to
it
normally.
The
processor
qualifies
its
execution
environment
by
first
reading
a
unique
processor
IO
contained
in
the
ICM
order
byte
of
interconnect
register
o.
E-5