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PDP-10 Archives
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BB-R595B-SM_11-9-85
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mcb/xpt/top.bli
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module TOP (
IDENT = 'X01040'
) =
begin
!
! COPYRIGHT (c) 1980, 1981, 1982
! DIGITAL EQUIPMENT CORPORATION
! Maynard, Massachusetts
!
! This software is furnished under a license and may be used
! and copied only in accordance with the terms of such license
! and with the inclusion of the above copyright notice. This
! software or any other copies thereof may not be provided or
! otherwise made available to any other person. No title to
! and ownership of the software is hereby transferred.
!
! The information in this software is subject to change
! without notice and should not be construed as a commitment
! by DIGITAL EQUIPMENT CORPORATION.
!
! DIGITAL assumes no responsibility for the use or reliability
! of its software on equipment which is not supplied by
! DIGITAL.
!
!++
! FACILITY: Application Services
!
! ABSTRACT:
!
! Network Topology task - sends to anyone who connects to it a bit map
! of the network topology. The map, which is contained in a single
! message, is of the following format:
!
! +----+----+----+----+ +-----+
! | NN | n1 | n2 | n3 | * * * | nNN + Field
! +----+----+----+----+ +-----+
! 2 .2 .2 .2 .2 Length (bytes.bits)
!
! where:
!
! NN is the highest node number accessible from the local
! node.
! nX is a two-bit field giving the topology status for node
! X:
!
! 00 Node not reachable
! 01 (reserved)
! 10 Accessible Phase II node
! 11 Assessible Phase III node
!
! As is the customary DECnet convention, the bit fields are arranged from
! low-order to high-order in each byte, four to a byte, and the bytes are
! arranged from beginning to end of the message. Thus bits 0-1 of byte 2
! (zero-based) in the message are for node 1, bits 2-3 of the byte are
! for node 2, bits 0-1 of byte 3 are for node 5, and so forth.
!
! The total length of the message is (NN+3)/4 + 2 bytes.
!
! ENVIRONMENT: MCB
!
! AUTHOR: L. Webber , CREATION DATE: 27-Jan-81
!
! MODIFIED BY:
!
! 27-Jan-81 : VERSION 1.00
!
! 1.01 L. Webber, 3-Mar-81
! Quit ACCEPT_COMPLETE after an abort.
!
! 1.02 A. Peckham, 8-May-82
! Eliminate GETLDB$ and RETLDB$ references.
!
! 1.04 A. Peckham, 21-May-82
! Use state machine.
!
!--
!
! INCLUDE FILES:
!
library 'MCB:MCBLIB';
library 'MCB:XPORTX';
library 'MCB:SCSYS';
require 'XPT:TOPMAC';
!
! TABLE OF CONTENTS
!
forward routine
RCPDSP: MCB_DB_CCB_MOD novalue,
XCPDSP: MCB_DB_CCB_MOD novalue,
INIT_TOP: MCB_DB_MOD novalue,
RCV_CONNECT: MCB_DB_CCB novalue,
RCV_ABORT: MCB_DB_CCB novalue,
ACCEPT_COMPLETE: MCB_DB_CCB novalue,
SEND_COMPLETE: MCB_DB_CCB novalue,
DISCONNECT_COMPLETE: MCB_DB_CCB novalue,
ABORT: MCB_DB_CCB novalue,
SEND_MESSAGE: MCB_DB_CCB novalue;
!
! MACROS:
!
macro RAD50(NAME) =
%IF %bliss(BLISS36) %THEN
%RAD50_10 %string(NAME)
%ELSE
%RAD50_11 %string(NAME)
%FI %;
!
! EQUATED SYMBOLS:
!
!
! OWN STORAGE:
!
external routine $DSPCR: novalue;
bind $TOPLL = TABLE$ ($DSPCR, FC_CCP, ! Dispatch table:
(FC_TIM,INIT_TOP), ! Timer service
(FC_XCP,XCPDSP), ! Transmit complete
(FC_RCP,RCPDSP)); ! Receive complete
$MCB_PROCESS(name=TOP,llc_dispatch=$TOPLL)
!
! EXTERNAL REFERENCES:
!
external
MCB$GW_PROCESS_HANDLE;
routine RCPDSP (DB,CCB,MODD): MCB_DB_CCB_MOD novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Dispatches Receive Complete subfunctions.
!
! FORMAL PARAMETERS
!
! DB Process database
! CCB Function CCB
! MODD Modifier
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
DISPATCH$(.MODD,
TABLE$ ($DSPCR, 0, ! Sub-dispatch table
(S$CNR,RCV_CONNECT), ! Connect Received
(S$DSR,RCV_ABORT)), ! Abort Received
(.DB,.CCB),
MCB_DB_CCB);
end; !End of RCPDSP
routine TIMDSP (DB,CCB,MODD): MCB_DB_CCB_MOD novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Dispatches Time subfunctions.
!
! FORMAL PARAMETERS
!
! DB Process database
! CCB Function CCB
! MODD Modifier
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
DISPATCH$(.MODD,
TABLE$ ($DSPCR, 0, ! Sub-dispatch table
(FM_PIN,INIT_TOP), ! Initialize
(FM_CCB,SEND_MESSAGE)),! Use CCB
(.DB,.CCB),
MCB_DB_CCB);
end; !End of TIMDSP
routine XCPDSP (DB,CCB,MODD): MCB_DB_CCB_MOD novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Dispatches Transmit Complete subfunctions.
!
! FORMAL PARAMETERS
!
! DB Process database
! CCB Function CCB
! MODD Modifier
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
DISPATCH$(.MODD,
TABLE$ ($DSPCR, 0, ! Sub-dispatch table
(S$ACC,ACCEPT_COMPLETE), ! Accept complete
(S$SND,SEND_COMPLETE), ! Message sent
(S$DIS,DISCONNECT_COMPLETE), ! Disconnection completed
(S$ABO,DISCONNECT_COMPLETE)), ! Abort completed
(.DB,.CCB),
MCB_DB_CCB);
end; !End of XCPDSP
routine INIT_TOP (DB,MODD): MCB_DB_MOD novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Performs process initialization for TOP:
!
! 1. Acquires the Transport data base address from XPT.
! 2. Gets a work CCB, to cut down the risk of resource
! failure.
! 3. Calculates Session Control's PIX and stores it in
! the TOP data base.
!
! FORMAL PARAMETERS
!
! DB TOP data base address
! MODD Function modifier: must be FM_PIN
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! All subsequent processing for TOP assumes that the Session
! Control PIX and the Transport data base address already exist
! in the TOP data base.
!
!--
begin
map DB: ref block field(D_FIELDS);
!
! Get the PIX for Transport (temporarily)
!
if not PDVID$(rad50(XPT),D_XPTPIX)
then SIGNAL_STOP($TOP$_CFG);
end; !End of INIT_TOP
routine RCV_CONNECT (DB,CCB): MCB_DB_CCB novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Processes an incoming connect. Only one link at a time is allowed.
!
! FORMAL PARAMETERS
!
! DB TOP data base address
! CCB Function CCB
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
map DB: ref block field(D_FIELDS);
map CCB: ref block field(C_FIELDS);
if .D_STATE neq DS_IDLE ! Link already in use -
then begin ! reject this one
$SC_CONNECT_RECEIVED(.CCB,0,S_EOTB);
return;
end;
D_STATE = DS_DO_ACCEPT;
D_LLA = .CCB[C_LIX]; ! Save the LLA
D_SCPIX = .CCB[C_PIX]; ! and SC PIX.
$SC_CONNECT_RECEIVED(.CCB, ! Acknowledge the connection
.C_ULA,S_SSUC);
SEND_MESSAGE(D_BASE,0)
end; !End of RCV_CONNECT
routine RCV_ABORT (DB,CCB): MCB_DB_CCB novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Processes the completion of a disconnect or abort. Since the
! disconnect cannot complete until the previous transmit has completed,
! and any abort will occur without any transmits outstanding, very little
! needs to be done in this routine.
!
! FORMAL PARAMETERS
!
! DB TOP data base address
! CCB Function CCB
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
map DB: ref block field(D_FIELDS);
map CCB: ref block field (C_fields);
$SC_DISCONNECTED(.CCB);
case .D_STATE from DS_LO to DS_HI of
set
[DS_DO_ACCEPT,DS_DO_DISCONNECT, DS_DO_ABORT]:
D_STATE = DS_DO_ABORT;
[inrange]:
begin
ABORT(D_BASE,0);
end;
tes;
end; !End of RCV_ABORT
routine ACCEPT_COMPLETE (DB,CCB): MCB_DB_CCB novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! This routine is invoked after the connect accept has completed.
! If the link hasn't aborted in the meanwhile, the routine gets
! an buffer large enough to contain the topology message, constructs
! the message, sends it out, and sticks a synchronous disconnect
! behind it.
!
! FORMAL PARAMETERS
!
! DB TOP data base address
! CCB Function CCB
!
! IMPLICIT INPUTS
!
! None
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
map DB: ref block field(D_FIELDS);
map CCB: ref block field(C_FIELDS);
selectone .D_STATE of
set
[DS_ACCEPTING]:
;
[DS_DO_ABORT, DS_ABORTING]:
return $MCB_RETURN_CCB(.CCB);
[otherwise]:
return ABORT(D_BASE,.CCB);
tes;
!
! Error conditions:
!
! 1. Link aborted.
! 2. Unable to get a buffer to construct the message.
!
if (.CCB[C_STS] neq S_SSUC)
then return ABORT(D_BASE,.CCB);
if not $MCB_GET_BUFFER(.D_ALLOCATION,CCB[C_ADDR])
then return ABORT(D_BASE,.CCB);
SMAP$(CCB[C_BIAS]);
CCB[C_PRM5] = .D_ALLOCATION;
!
! Construct the message
!
CALL$P(GETTOP, .D_XPTPIX, .CCB);
$SC_DATA_SEGMENT_TRANSMIT(.CCB, ! Send out
.D_SCPIX,.D_LLA,.C_ULA,S$PEOM); ! the message
D_STATE = DS_DO_DISCONNECT;
SEND_MESSAGE(D_BASE,0);
end; !End of ACCEPT_COMPLETE
routine SEND_COMPLETE (DB,CCB): MCB_DB_CCB novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Processes the completion of the message transmission. Because
! a disconnect was sent after it, all that has to be done is to
! release the message buffer.
!
! FORMAL PARAMETERS
!
! DB TOP data base address
! CCB Function CCB
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
map DB: ref block field(D_FIELDS);
map CCB: ref block field (C_fields);
$MCB_RETURN_CCB_AND_BUFFER(.D_ALLOCATION,.CCB);
end; !End of SEND_COMPLETE
routine DISCONNECT_COMPLETE (DB,CCB): MCB_DB_CCB novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Processes the completion of a disconnect or abort. Since the
! disconnect cannot complete until the previous transmit has completed,
! and any abort will occur without any transmits outstanding, very little
! needs to be done in this routine.
!
! FORMAL PARAMETERS
!
! DB TOP data base address
! CCB Function CCB
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
map DB: ref block field(D_FIELDS);
$MCB_RETURN_CCB(.CCB);
D_STATE = DS_IDLE;
end; !End of DISCONNECT_COMPLETE
routine ABORT (DB,CCB): MCB_DB_CCB novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Abort the link.
!
! FORMAL PARAMETERS
!
! DB TOP data base address
! CCB Function CCB
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
map DB: ref block field(D_FIELDS);
map CCB: ref block field(C_FIELDS);
D_STATE = DS_DO_ABORT;
SEND_MESSAGE(D_BASE, .CCB);
end; !End of ABORT
routine SEND_MESSAGE (DB,CCB): MCB_DB_CCB novalue =
!++
! FUNCTIONAL DESCRIPTION:
!
! Send a SC message appropriate to the state with the given CCB.
!
! FORMAL PARAMETERS
!
! DB TOP data base address
! CCB Function CCB
!
! IMPLICIT INPUTS
!
! NONE.
!
! ROUTINE VALUE:
! COMPLETION CODES:
!
! NONE.
!
! SIDE EFFECTS:
!
! NONE.
!
!--
begin
map DB: ref block field(D_FIELDS);
map CCB: ref block field(C_FIELDS);
if .CCB eqla 0
then if not $MCB_GET_CCB(CCB)
then return $MCB_REQUEST_CCB();
case .D_STATE from DS_LO to DS_HI of
set
[DS_DO_ACCEPT]:
begin
D_STATE = DS_ACCEPTING;
$SC_ACCEPT(.CCB,.D_SCPIX, ! Accept the connection
.D_LLA,.C_ULA,S$PSEG,(,,0));
end;
[DS_DO_DISCONNECT]:
begin
D_STATE = DS_DISCONNECTING;
$SC_DISCONNECT(.CCB,.D_SCPIX,.D_LLA,.C_ULA,(,,0));
end;
[DS_DO_ABORT]:
begin
D_STATE = DS_ABORTING;
$SC_ABORT(.CCB,.D_SCPIX,.C_ULA,(,,0));
end;
[inrange]:
$MCB_RETURN_CCB(.CCB);
tes;
end; !End of SEND_MESSAGE
end !End of Module TOP
eludom