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SYSTEM
0BJECl'S
STRt.CIURES
Function
State
Field
-
The
function
state
field
is
used
to
describe
the
current
state
of
the
function
request
facility.
It
has
the
following
organization.
8
bits
lxxlxlxlxxxxl
1
1 1
1--
function
completion
state
1
1-----
SEND
completion
state
1
1-------
RECEIVE
completion
state
1---------
fault
level
1----------------
reserved
The
interpretation
of
the
function
completion
state
subfield
is
as
follCMs:
0000 -
function
completed
0001 -
function
in
progress
0010 - 1111 -
reserved
The
interpretation
of
the
SEND
or
RECEIVE
completion
state
subfields
is
as
follows:
o - completed
1 - blocked
The
fault
level
subfield
indicates
whether a
fault
which has occured
is
context-level,
process-level,
or
processor-level.
The
fault
handler
requires
this
information
in
order
to
know
where
the
fault
information has been
stored.
The
interpretation
of
the
fault
level
subfield
is
as
follCMS:
00
- none
01
-
context-level
fault
10
-
process-level
fault
11 -
processor-level
fault
Mapping
Facility
Area -
The
mapping
facility
consists
of
five'
map
entries
capable
of
suworting
the
randan mapping
of
five
non-overlapping
address
sub ranges from
the
Peripheral
Subsystem
into
corresponding 432
data
segments. One
of
these
map
entries
(entry
0)
is
capable
of
supporting
block
transfer
as
well
as
random
mapping.
One
map
entry
(entry
1)
is
capable
of
supporting mapping
into
the
432
interconnection
address space
as
well
as
random
mapping.
One
map
entry
(entry
4)
and
its
associated
Peripheral
Subsystem address
subrange always
maps
onto
the
processor
data
segment.
The
two major
purposes
of
this
subrange
are
to
capture
references
to
the
function
request
facility
and
to
allCM
Attached Processor
software
to
read
A-IS