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Trailing-Edge - PDP-10 Archives - BB-BT99S-BB_1990 - 10,7/decmai/mx/mxnt10.r36
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!	COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1985, 1989.
!	ALL RIGHTS RESERVED.
!
!	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 THAT IS NOT SUPPLIED BY DIGITAL.
!++
! Facility: LSG DECnet Network Management
!
! Abstract: This file contains definitions that are specific to
!	    TOPS10.
!
! Environment: TOPS10
!
! Author: Stu Grossman, Creation date: June 1981
!
!--

!<BLF/PAGE>
!
! Other requirements for TOPS10
!

switches list (norequire);			! Suppress monitor symbol listing

require 'BLI:TENDEF';				! Generic definitions

require 'BLI:UUOSYM';				! Monitor symbols

undeclare %quote
    DEBRK$;					! Fix definition of DEBRK. UUO

macro
    DEBRK$ =
 %O'047', 0, %O'000137' %;			! ...

!
! Un-Definitions for Tops-10 to prevent symbol conflicts
!

undeclare %quote
    LOCK,
    %quote INPUT,
    %quote OUTPUT;

!
! Definitions for -36 instructions
!

literal
    HRRI = %O'541',				! Half right to right immediate
    HRLI = %O'505',				! Half right to left immediate
    EXCH = %O'250',				! Exch register and memory
    SETOM = %O'476',				! Set memory to all ones
    SETZM = %O'402',				! Set memory to all zeros
    AOSE = %O'352',				! Add one to memory, skip if eql 0
    AOSN = %O'356',				! Add one and skip if non-zero
    SOSGE = %O'375',				! Subtract one and skip if leq 0
    PUSH = %O'261',				! Push value onto stack
    POP = %O'262',				! Pop value from stack
    PUSHJ = %O'260',				! Call routine, save return on stack
    JSR = %O'264',				! Jump to subroutine.  Uses no ACs
    JRST = %O'254',				! Jump to addr
    ADJSP = %O'105',				! Adjust stack pointer
    MOVE = %O'200',				! Load value into AC
    MOVEM = %O'202',				! Store value into memory
    MOVEI = %O'201',				! Load effective address into register
    BLT = %O'251';				! Transfer memory block

!

literal
    MEMSIZE = %O'121',				! Location containing first free word
    						!  in memory.
    CONTEXT_SIZE = %O'20';			! Number of fullwords in a task's

						!  context (all the registers).
!

field
    STACK_POINTER_FIELDS =
	set
	STACK_SIZE = [0, 18, 18, 1],		! Number of words left in stack
	STACK_ADDRESS = [0, 0, 18, 0]		! Address of current word in stack
	tes;

!<BLF/PAGE>
!
! Semaphore LOCK/UNLOCK macros
!
! macro: LOCK
!		This macro attempts a semaphore lock.  If the lock
!		attempt is successful, a "true" value is returned.
!
!	LOCK (SEMAPHORE)
!
!	where SEMAPHORE is the address of a SEMAPHORE_BLOCK.

undeclare %quote
    LOCK;					! Force override of definition of LOCK uuo

macro
    LOCK (SEMA_ADDR) =
	begin
	    builtin MACHSKIP;
	    bind SEMBLK = SEMA_ADDR : SEMAPHORE_BLOCK;

	    MACHSKIP (AOSE, 0, SEMBLK [SEMAPHORE])
	    end %;

!
! macro: UNLOCK
!
!		This macro unlocks a semaphore that has been locked
!		with a LOCK macro call.
!
!	UNLOCK (SEMAPHORE)
!
!	where SEMAPHORE is the address of a SEMAPHORE_BLOCK.

macro
    UNLOCK (SEMA_ADDR) =
	begin
	    builtin MACHOP;
	    bind SEMBLK = SEMA_ADDR : SEMAPHORE_BLOCK;
	    MACHOP (SETOM, 0, SEMBLK [SEMAPHORE]);
	end %;

!<BLF/PAGE>
!
! Task scheduling macros
!
! macro: CONTEXT_SWITCH
!
!		This macro swaps the current task with the
!		specified future task.
!
!	CONTEXT_SWITCH (NEW_TASK)
!
!	where NEW_TASK is the address of the new task's task block.

macro
    CONTEXT_SWITCH (NEW_TASK) =
	begin
	    external routine SS_SWITCH;	! System specific routine
	    SS_SWITCH (NEW_TASK);
	end %;

!
! macro: CURRENT_TASK
!
!		This macro returns the address of the
!		current task's task block.

macro
    CURRENT_TASK =
	begin
	    external CURTSK;		! Cell containing current task
	    .CURTSK
	end %;

!
! macro: TASK_INITIALIZE
!
!		This macro initializes a task's task block.
!		Specifically it sets up the stack and the
!		starting address so that the task will swap
!		context properly the first time that it
!		is scheduled.
!
!	TASK_INITIALIZE (TASK_BLOCK, STACK_SIZE)
!
!	where TK_BLOCK is the task's task block address
!	      STACK_SIZE is the number of fullwords its stack.

macro
    TASK_INITIALIZE (TK_BLOCK, STACK_SIZE) =
	begin
	    external routine SS_TINIT;	! System specific routine
	    SS_TINIT (TK_BLOCK, STACK_SIZE);
	end %;

!
! macro: STOP_PROGRAM
!
!		Make NML die gracefully by calling code at RENTER in
!		NMUT10.MAC.
!

macro
    STOP_PROGRAM =
	begin
	external routine
	    NMLDIE;

	NMLDIE ();
	end %;

!<BLF/PAGE>
!
! macro: INTERRUPT_DATA_BASE
!
!		This macro defines the interrupt vector tables
!		and any other miscellaneous variables that are
!		required by the interrupt system.

macro
    INTERRUPT_DATA_BASE =

compiletime
    EXTRA=0;

%debug (ALWAYS, %assign(EXTRA,100));	! Extra stack needed for debuggery

macro
    INTERRUPT_LEVEL_FLAG = ATINTL %quote %;!Define pseudoname for global symbol

literal
    INTERRUPT_STACK_SIZE = 100 + EXTRA;	! Number of words in a interrupt stack

global
     VECTAB : vector [10],		! Routine to call for each channel
     DATTAB : vector [10],		! Data to pass to interrupt routine
     APRTAB : vector [2],		! Routine to call for APR traps
     INTERRUPT_LEVEL_FLAG : initial (0);! Says we are at interrupt level

!+
! The following table is used by the interrupt routine for network I/O.
! It associates the channel number (as supplied by the interrupt vector block)
! with the appropriate LINK_INFO block. In this way, the correct routine gets
! waken up by the interrupt level.
!-

global
    NETLNK : vector [10] initial (rep 10 of (0));	!Support up to 10 links

!
! Stack and pointer for interrupt level 1
!
own
    STACK1 : vector [INTERRUPT_STACK_SIZE],
    LEV1STK : block [1] field (STACK_POINTER_FIELDS)
		preset ([STACK_SIZE] = -INTERRUPT_STACK_SIZE,
			[STACK_ADDRESS] = STACK1-1);

!
! Stack and pointer for interrupt level 2
!
own
    STACK2 : vector [INTERRUPT_STACK_SIZE],
    LEV2STK : block [1] field (STACK_POINTER_FIELDS)
		preset ([STACK_SIZE] = -INTERRUPT_STACK_SIZE,
			[STACK_ADDRESS] = STACK2);
!
!
! Stack and pointer for interrupt level 3
!
!own
!    STACK3 : vector [INTERRUPT_STACK_SIZE],
!    LEV3STK : block [1] field (STACK_POINTER_FIELDS)
!		preset ([STACK_SIZE] = -INTERRUPT_STACK_SIZE,
!			[STACK_ADDRESS] = STACK3);
!
!
! Define channels on each interrupt level.
!

macro
    LEVEL1_INTERRUPT_SET =
	0, 1, 2, 3, 4, 5, 6, 7, 8, 9 %quote %;

macro
    LEVEL2_INTERRUPT_SET =
	0, 1 %quote %;

!
! Vector routines for each interrupt channel.
!

macro
    $$INT_FORWARDS [CHNNO] =
	%name ('CSRV', CHNNO) : novalue %quote %;

macro
    $$INT_APR_FORWARDS [CHNNO] =
	%name ('APRTP', CHNNO) : novalue %quote %;

macro
    LEVEL1_VECTOR_ROUTINES [] =
	forward routine
	  $$INT_FORWARDS (%remaining);
	$$LEV1_ROUTINE (%remaining);
	    %quote %;

macro
    $$LEV1_ROUTINE [CHNNO] =
	  routine %name ('CSRV', CHNNO) : novalue =
		begin
		    literal P = %O'17';
		    external PIVEC : blockvector [8,4] field(PI_VECTOR_FIELDS);
                    external CRSACS;

		    builtin MACHOP, UUO;
%debug(ALWAYS,	   (MACHOP (SETOM, 0, INTERRUPT_LEVEL_FLAG);))
		    MACHOP (EXCH, P, LEV1STK);
		    MACHOP (PUSH, P, 1);
		    MACHOP (MOVEI, 1, PIVEC [CHNNO, PI_VEC_OLDPC]);
		    MACHOP (PUSH, P, 1);
		    MACHOP (PUSH, P, DATTAB + CHNNO);
		    MACHOP (PUSHJ, P, .(VECTAB + CHNNO), 0, 0);
		    MACHOP (ADJSP, P, -2);
		    MACHOP (POP, P, 1);
		    MACHOP (EXCH, P, LEV1STK);
%debug(ALWAYS,	   (MACHOP (SETZM, 0, INTERRUPT_LEVEL_FLAG);))
		    UUO (1, DEBRK$);
! This should never return, but if you screwed up it would
		end %quote %;

macro
    LEV1INT [CHNNO] =
	[CHNNO, PI_VEC_NEWPC] = %name ('CSRV', CHNNO),
	[CHNNO, PI_VEC_FLAGS] = PS$VTO %quote %;


macro
    LEVEL2_VECTOR_ROUTINES [] =
	forward routine
	  $$INT_APR_FORWARDS (%remaining);
	$$LEV2_ROUTINE (%remaining);
	    %quote %;

macro
    $$LEV2_ROUTINE [CHNNO] =
	  routine %name ('APRTP', CHNNO) : novalue =
		begin
		    literal P = %O'17';
		    external APRVEC : blockvector [2,2] field (APR_VECTOR_FIELDS);
		    builtin MACHOP, UUO;
		    MACHOP (EXCH, P, LEV2STK);
		    MACHOP (PUSH, P, 1);
		    MACHOP (MOVEI, 1, APRVEC [CHNNO, APR_VEC_OLDPC]);
		    MACHOP (PUSH, P, 1);
		    MACHOP (PUSH, P, DATTAB + CHNNO);
		    MACHOP (PUSHJ, P, .(APRTAB + CHNNO), 0, 0);
		    MACHOP (ADJSP, P, -2);
		    MACHOP (POP, P, 1);
		    MACHOP (EXCH, P, LEV2STK);
		    MACHOP (JRST, 2, APRVEC [CHNNO, APR_VEC_OLDPC], 0, 1);
		end %quote %;

macro
    LEV2INT [CHNNO] =
	[CHNNO, APR_VEC_NEWPC] = JRST ^ 27 + %name ('APRTP', CHNNO) %quote %;

field
	PI_VECTOR_FIELDS =
	set
	PI_VEC_NEWPC = [$PSVNP, 0, 36, 0],	! Interrupt vector
	PI_VEC_OLDPC = [$PSVOP, 0, 36, 0],	! Address for DEBRK
	PI_VEC_FLAGS = [$PSVFL, 0, 36, 0],	! Flags
	PI_VEC_STATUS = [$PSVIS, 0, 36, 0]	! Status of this interrupt
	tes;

field
	APR_VECTOR_FIELDS =
	set
	APR_VEC_OLDPC = [0, 0, 36, 0],		! (E) of a JSR
	APR_VEC_NEWPC = [1, 0, 36, 0]		! JRST to hi-seg routine
	tes;

LEVEL1_VECTOR_ROUTINES (LEVEL1_INTERRUPT_SET);
LEVEL2_VECTOR_ROUTINES (LEVEL2_INTERRUPT_SET);

!
! Interrupt channel table
!
global
    PIVEC : blockvector [10, 4] field (PI_VECTOR_FIELDS)
	preset (LEV1INT (LEVEL1_INTERRUPT_SET)),
    APRVEC : blockvector [2, 2] field (APR_VECTOR_FIELDS)
	preset (LEV2INT (LEVEL2_INTERRUPT_SET));

  %;

!<BLF/PAGE>
!
! Interrupt system operation macros
!
! macro: CLEAR_INTERRUPT_SYSTEM
!
!		This macro clears the interrupt system.  All interrupts
!		disabled.
!

macro
    CLEAR_INTERRUPT_SYSTEM =
	begin
	register T1;
	builtin UUO;

	T1 = PS$FOF + PS$FCP;
	UUO (1, PISYS$(T1));
	end %;

!
! macro: INITIALIZE_INTERRUPT_SYSTEM
!
!		This macro setups any initial values needed in
!		the interrupt data base and informs the operating
!		system about the interrupt vector tables.
!

macro
    INITIALIZE_INTERRUPT_SYSTEM =
	begin
	builtin UUO;
	register T1;
	external PIVEC : blockvector [6,4];
	external INTNST;

	T1 = PIVEC;
	UUO (1, PIINI$(T1));
	INTNST = -1;
	end %;

!
! New form INTERRUPT handling
!

macro
    TIMER_INTERRUPT_ROUTINE =
	: TIMER_INTERRUPT_LINKAGE %,
    NETWORK_INTERRUPT_ROUTINE =
        (CHANNEL_STATUS) : NETWORK_INTERRUPT_LINKAGE %,
    NI_RECEIVER_INTERRUPT_ROUTINE =
	: NI_RECEIVER_INTERRUPT_LINKAGE %,
    IPCF_INTERRUPT_ROUTINE =
	: IPCF_INTERRUPT_LINKAGE %;

macro
    INTERRUPT_LINKAGE =
	pushj :
	    linkage_regs (15,13,1)
	    preserve (0,2,3,4,5,6,7,8,9,10,11,12,14)
	%;

linkage
    VANILLA_INTERRUPT_LINKAGE = INTERRUPT_LINKAGE,
    TIMER_INTERRUPT_LINKAGE = INTERRUPT_LINKAGE,
    NETWORK_INTERRUPT_LINKAGE = INTERRUPT_LINKAGE,
    NI_RECEIVER_INTERRUPT_LINKAGE = INTERRUPT_LINKAGE,
    IPCF_INTERRUPT_LINKAGE = INTERRUPT_LINKAGE;

macro
    INTERRUPT_ROUTINE [] =
	(
	 %remaining
		) : VANILLA_INTERRUPT_LINKAGE
	%warn('Best to Use ???_INTERRUPT_ROUTINE') %;

!
! Macro - ALLOCATE_NETLNK
!
! Function - This macro searches NETLNK for a 0 entry and installs the
!	     channel number and the LINK_INFO block address into that slot.
!
! Parameters -
!
!    CHAN	The NSP. channel to be used
!    INFBLK	The address of the LINK_INFO block
!
!-

macro
    ALLOCATE_NETLNK (CHAN, INFBLK) =
    begin
	external NETLNK : vector [10];

	%debug (always,
	begin
	    if (CHAN) gtr 9 or .NETLNK [CHAN] neq 0 then
	       TASK_ERROR ('Bad channel number in ALLOCATE_NETLNK');
	end;)

	NETLNK [CHAN] = INFBLK;
    end
    %;

macro
    SEARCH_NETLNK (CHAN) =
    begin
	external NETLNK : vector [10];

	%debug (always,
	begin
	    if (CHAN) gtr 9 then
	     TASK_ERROR ('Channel out of range in DEALLOCATE_NETLNK');
	end;)

	.NETLNK [CHAN]
    end
%;

macro
    DEALLOCATE_NETLNK (CHAN) =
    begin
	external NETLNK : vector [10];

	%debug (always,
	begin
	    if (CHAN) gtr 9 or CHAN leq 0 then
	    TASK_ERROR ('Bad channel numbet given to DEALLOCATE_NETLNK');
	end;)

	NETLNK [CHAN] = 0;
    end
    %;

!
! Macro - ALLOCATE_INTERRUPT_CHANNEL
!
! Function - This macro searchs the interrupt channel table
!            for a free channel.
!
! Paramaters -
!
!    I_ROUTINE    Routine to call when interrupt occurs on channel
!    I_DATA       Data to pass to interrupt routine when called
!
! Return value -
!
!        -1    No channel available
!        >0    Channel number
!

macro
    ALLOCATE_INTERRUPT_CHANNEL (I_ROUTINE, I_DATA) =
	begin
	local RESULT;
	external
                VECTAB : vector [10],
                DATTAB : vector [10];

	RESULT = -1;

	incr INDEX from 0 to 9 do

	    if .VECTAB [.INDEX] eql 0
	    then
		begin
		RESULT = .INDEX;
		exitloop;
		end;

        %if not %null (I_ROUTINE)
        %then
             if .RESULT neq -1
             then VECTAB [.RESULT] = I_ROUTINE;
        %fi

        %if not %null (I_DATA)
        %then
             if .RESULT neq -1
             then DATTAB [.RESULT] = I_DATA;
        %fi

	.RESULT
	end %;

!
! Macro - RELEASE_INTERRUPT_CHANNEL
!
! Function - This macro flags that an interrupt channel is
!            now available for use
!
! Parameters -
!
!    CHANNEL    Channel number to release
!

macro
    RELEASE_INTERRUPT_CHANNEL (CHANNEL) =
	begin
	external VECTAB : vector [10];
	VECTAB [CHANNEL] = 0;
	end %;

! System specific time interface
!
! This set of macros allows transparent manipulation of "time"
! in a particular system.  The macros are defined to read time
! from the operating system, read time with a offset, compare time,
! set and clear interrupts on time.
!
!
! Time block structure
!
!	This structure defines the format needed for a specific
!	system to store a internal time/date value.

literal
    TIME_BLOCK_SIZE = 1,
    TIME_BLOCK_ALLOCATION = 1;

macro
    TIME_BLOCK =
 vector [1] %;

!
! macro: TIME_PLUS
!
!		This macro adds the second argument (which is in units of
!		seconds) to the first argument which is a time block.
!

macro
    TIME_PLUS (TIME, SECONDS) =
    begin
	bind TBLK = TIME : TIME_BLOCK;

	TBLK [0] = .TBLK[0] + SECONDS  ^ 18 / (24 * 60 * 60)
    end %;

!
! macro: TIME_DIFFERENCE_SECONDS
!
!		This macro computes the difference of two internal format
!		times. Its two arguments are the addresses of the TIME_BLOCKs.
!		Its value is the difference between the two times in seconds

macro
    TIME_DIFFERENCE_SECONDS (TIME1, TIME2) =
    begin
	bind TBLK1 = TIME1 : TIME_BLOCK,
	     TBLK2 = TIME2 : TIME_BLOCK;
	builtin
	    ash;

	ash (((.TBLK1[0] - .TBLK2[0]) * 24 * 60 * 60 + 1 ^ 17), -18)
    end
%;

!
! macro: TIME_CURRENT
!
!		This macro returns the current time in
!		the host operating systems time format.
!		This is the format needed to set timer
!		interrupts.
!
!	TIME_CURRENT (OFFSET, TIM_BLK)
!
!	where	OFFSET	is the number of seconds to add to the
!			actual current time.
!		TIM_BLK	is the address of the time block in which
!			to store the resulting time.

macro
    TIME_CURRENT (OFFSET, TIM_BLK) =
	begin
	    bind TBLK = TIM_BLK : TIME_BLOCK;
	    builtin UUO;
	    register T1;

	    T1 = _CNDTM;
	    UUO (1, GETTAB(T1));
	    TBLK [0] = .T1 + OFFSET * 3;
	end %;

!
! macro: TIME_INTERRUPT_CLEAR
!
!		This macro clears all outstanding timer interrupts.
!

macro
    TIME_INTERRUPT_CLEAR =
	begin
	    builtin UUO;
	    register T1;

	    T1 = %o '777777';	! Make time for next interrupt be infinity
	    UUO (1, PITMR$(T1));
	end %;

!
! macro: TIME_INTERRUPT_SET
!
!		This macro sets a time interrupt.  It also
!		defines the routine to be called when the
!		interrupt occurs.
!
!		Note that since the interrupt channel is
!		hard coded the time interrupt must be unique.
!
!	TIME_INTERRUPT_SET (TIME_BLK, TROUTINE)
!
!	where	TIM_BLK	is the time in the future for a interrupt
!		ROUTINE	is the address of the interrupt service routine

macro
    TIME_INTERRUPT_SET (TIM_BLK, TROUTINE) =
	begin
	    bind TBLK = TIM_BLK : block [1];
	    builtin UUO;
	    register T1, T2, T3;
	    external VECTAB : vector [10];
	    local ARGLST : vector [3];
	    own TIMER_CHANNEL : initial (-1);

! Compute the daytime in seconds
	    T2 = _CNDTM;
	    UUO (1, GETTAB(T2));

! Compute the amount of time (in seconds) to be hibered
!  .T2 = the current time, TBLK contains the wakeup time
	    T2 = TIME_DIFFERENCE_SECONDS (TBLK, T2);

! If .T2 (the amount of time to be hibered) leq 0 then the wakeup
!  time has passed, in which case we call TROUTINE immediately.

	    if .T2 leq 0 then
	    TROUTINE()
	    else
	    begin


! Now set up the PISYS to trap on the timer interrupt

		if (.TIMER_CHANNEL eql -1) then
		begin
		    TIMER_CHANNEL = ALLOCATE_INTERRUPT_CHANNEL (TROUTINE);

		    ARGLST [0] = $PCTMR;
		    ARGLST [1] = (.TIMER_CHANNEL * 4) ^ 18;
		    ARGLST [2] = 0;
		    T1 = PS$FAC + ARGLST;
		    UUO (1, PISYS$(T1));
		end;

! Tell the monitor when to wake us up

		UUO (1, PITMR$(T2));
	    end
	end %;

!
! macro: TIME_SET_NULL
!
!		This macro sets a time block to a null value.
!		This value is used as a sentinel to check for
!		a valid time value (null/not null).
!
!	TIME_SET_NULL (TIM_BLK)
!
!	where	TIM_BLK	is the address of the time block.

macro
    TIME_SET_NULL (TIM_BLK) =
	begin
	    bind TBLK = TIM_BLK : TIME_BLOCK;
	    TBLK [0] = -1;
	end %;

!
! macro: TIME_NOT_NULL
!
!		This macro checks to the value in a time block
!		to see if it is not null (see TIME_SET_NULL).
!
!	TIME_NOT_NULL (TIM_BLK)
!
!	where	TIM_BLK	is the address of the time block to test.

macro
    TIME_NOT_NULL (TIM_BLK) =
	begin
	    bind TBLK = TIM_BLK : TIME_BLOCK;
	    .TBLK [0] neq -1
	end %;

!
! macro: TIME_NULL
!
!		This macro checks to the value in a time block
!		to see if it is null (see TIME_SET_NULL).
!
!	TIME_NULL (TIM_BLK)
!
!	where	TIM_BLK	is the address of the time block to test.

macro
    TIME_NULL (TIM_BLK) =
	begin
	    bind TBLK = TIM_BLK : TIME_BLOCK;
	    .TBLK [0] eql -1
	end %;

!
! macro: TIME_COPY
!
!		This macro copies the time from one time block
!		to another time block.
!
!	TIME_COPY (TO_BLK, FRM_BLK)
!
!	where	TO_BLK	is the time block to copy the time to.
!		FRM_BLK	is the time block to copy the time from.

macro
    TIME_COPY (TO_BLK, FRM_BLK) =
	begin
	    bind TOBLK = TO_BLK : TIME_BLOCK,
		 FRMBLK = FRM_BLK : TIME_BLOCK;

	    TOBLK [0] = .FRMBLK [0];
	end %;

!
! macro: TIME_TEST
!
!		This macro tests the chronological relation of
!		the values in two time blocks.  The test operator
!		is specified as an argument to the macro.  The
!		value returned by this macro is a boolean (true/false)
!		from the test "TB1 TST_FNC TB2" (i.e. TB1 lss TB2).
!
!	TIME_TEST (TBLK1, TST_FNC, TBLK2)
!
!	where	TBLK1	is the first time block.
!		TST_FNC	is the test operator (LSS, GTR, EQL,..etc)
!		TBLK2	is the second time time.

macro
    TIME_TEST (TBLK1, TST_FNC, TBLK2) =
	begin
	    bind TIMBLK1 = TBLK1 : TIME_BLOCK,
		 TIMBLK2 = TBLK2 : TIME_BLOCK;

	    .TIMBLK1 [0] TST_FNC .TIMBLK2 [0]
	end %;

!
!<BLF/PAGE>
!
! macro: ARITHMETIC_OVERFLOW
!
!		This macro enables interrupts on arithmetic errors.
!		The routine specified will be called when an error
!		occurs.

macro
    ARITHMETIC_OVERFLOW (E_ROUTINE) =
	begin
	builtin UUO;
	external VECTAB : vector [10];
	local ARGLST : vector [3];
	register T1;

	APRTAB [0] = E_ROUTINE;

	ARGLST [0] = 1;
	ARGLST [1] = $UTAOF;
	ARGLST [2] = JSR^27 + APRVEC [0, APR_VEC_OLDPC];

	T1 = $UTSET ^ 18 + ARGLST;
	UUO (1 ,UTRP$(T1));
	end %;

! macro: STACK_OVERFLOW
!
!		This macro enables interrupts on push down list
!		overflows. The routine specified will be called
!		when an error occurs.

macro
    STACK_OVERFLOW (E_ROUTINE) =
	begin
	builtin UUO;
	external VECTAB : vector [10];
	local ARGLST : vector [3];
	register T1;

	APRTAB [1] = E_ROUTINE;

	ARGLST [0] = 1;
	ARGLST [1] = $UTPOV;
	ARGLST [2] = JSR^27 + APRVEC [1, APR_VEC_OLDPC];

	T1 = $UTSET ^ 18 + ARGLST;
	UUO (1 ,UTRP$(T1));
	end %;

! macro: ILLEGAL_INSTRUCTION
!
!		This macro enables interrupts on illegal instruction
!		traps. The routine specified will be called when an
!		error occurs.

macro
    ILLEGAL_INSTRUCTION (E_ROUTINE) =
	begin
	builtin UUO;
	external VECTAB : vector [10];
	local ARGLST : vector [3];
	register T1;

	T1 = ALLOCATE_INTERRUPT_CHANNEL (E_ROUTINE);

	ARGLST [0] = $PCIUU;
	ARGLST [1] = (.T1 * 4) ^ 18;
	ARGLST [2] = 0;

	T1 = PS$FAC + ARGLST;
	UUO (1, PISYS$(T1));
	end %;

! macro: ILLEGAL_MEMORY_REFERENCE
!
!		This macro enables interrupts on illegal memory reads
!		and writes.  The routine specified will be called when
!		an error occurs.

macro
    ILLEGAL_MEMORY_REFERENCE (E_ROUTINE) =
	begin
	builtin UUO;
	external VECTAB : vector [10];
	local ARGLST : vector [3];
	register T1;

	T1 = ALLOCATE_INTERRUPT_CHANNEL (E_ROUTINE);

	ARGLST [0] = $PCIMR;
	ARGLST [1] = (.T1 * 4) ^ 18;
	ARGLST [2] = 0;

	T1 = PS$FAC + ARGLST;
	UUO (1, PISYS$(T1));
	end %;

! macro: SYSTEM_RESOURCE_FAILURE
!
!		This macro enables interrupts on system resource
!		allocation failures.  The routine specified will
!		be called when an error occurs.

macro
    SYSTEM_RESOURCE_FAILURE (E_ROUTINE) =
	begin
	builtin UUO;
	external VECTAB : vector [10];
	local ARGLST : vector [3];
	register T1;

	T1 = ALLOCATE_INTERRUPT_CHANNEL (E_ROUTINE);

	ARGLST [0] = $PCXEJ;
	ARGLST [1] = (.T1 * 4) ^ 18;
	ARGLST [2] = 0;

	T1 = PS$FAC + ARGLST;
	UUO (1, PISYS$(T1));
	end %;

!<BLF/PAGE>
!
! macro: ACTIVATE_INTERRUPT
!
!		This macro enables a specific interrupt.  The
!		variable HANDLE points to the relevant interrupt
!		data base.

macro
    ACTIVATE_INTERRUPT (CHANNEL) =
 %;

!	begin
!	builtin UUO;
!	register T1;
!	local PISARG : vector [3];
!
!	PISARG [0] = .HANDLE_TAB [.HANDLE, HT_REASON];
!	PISARG [1] = (4 * .HANDLE_TAB [.HANDLE, HT_CHANNEL]) ^ 18;
!	PISARG [2] = 0;
!
!	T1 = PS$FAC + PISARG;
!	UUO (1, PISYS$(T1));
!	end %;
!
! macro: DEACTIVATE_INTERRUPT
!
!		This macro disables a specific interrupt.  The
!		variable HANDLE is the index into the HANDLE_TAB
!		interrup data base.

macro
    DEACTIVATE_INTERRUPT (CHANNEL) =
 %;

!	begin
!	builtin UUO;
!	register T1;
!	local PISARG : vector [3];
!
!	PISARG [0] = .HANDLE_TAB [.HANDLE, HT_REASON];
!	PISARG [1] = (4 * .HANDLE_TAB [.HANDLE, HT_CHANNEL]) ^ 18;
!	PISARG [2] = 0;
!
!	T1 = PS$FRC + PISARG;
!	UUO (1, PISYS$(T1));
!	end %;
!<BLF/PAGE>
!
! macro: INTERRUPT_ON
!
!		This macro enables the interrupt system.  If nested
!		INTERRUPT_OFF calls have been made, this call only
!		decrements the nesting count.

macro
    INTERRUPT_ON =
	begin
	    builtin UUO, MACHSKIP;
	    register T1;
	    external INTNST;		! Interrupt nesting count

	    T1 = PS$FON;
	    if not MACHSKIP (SOSGE, 0, INTNST) then UUO (1, PISYS$(T1));
	end %;

!
! macro: INTERRUPT_OFF
!
!		This macro turns the interrupt system off.  It
!		also increments the nesting count of times that
!		it has been turned off.

macro
    INTERRUPT_OFF =
	begin
	    register T1;
	    builtin UUO, MACHSKIP;
	    external INTNST;
	    T1 = PS$FOF;
	    if not MACHSKIP (AOSN, 0, INTNST) then
	       UUO (1, PISYS$(T1));	! Turn interrupt system off
	end %;

!<BLF/PAGE>
!
! System specific interrupt system internal macros
!
! macro: SET_*_INTERRUPT
!
!		These macro sets up a interrupt specified
!		by HANDLE_TAB [.HANDLE, *] (the interrupt
!		data base indexed by the handle).

macro
    SET_FILE_INTERRUPT =
	TASK_ERROR ('File interrupts not ready yet.') %;

macro
    SET_TIMER_INTERRUPT =
	TASK_ERROR ('Timer interrupts not ready yet.') %;

macro
    SET_NETWORK_INTERRUPT =
	TASK_ERROR ('Network interrupts not ready yet.') %;

!<BLF/PAGE>
!
! Wait Block Structure
!
!	This defines the WAIT_BLOCK used in timing out waiting for events,
!	specifically those waits implemented by calling NMU$SCHED_WAIT.
!
$field WAIT_BLOCK_FIELDS =
set
WAITING_TASK = [$address], 			!task block addr, to ref semaphore
$ALIGN (FULLWORD)WAIT_EVENT = [$address], 	!addr of event block to wait on
$ALIGN (FULLWORD)WAIT_TIME = [$sub_block (TIME_BLOCK_SIZE)]	!time at which to 'wake'
tes
;
!

literal
    WAIT_BLOCK_SIZE = $field_set_size;

!

macro
    WAIT_BLOCK =
 block [WAIT_BLOCK_SIZE] field (WAIT_BLOCK_FIELDS)%;

!
!
! Memory allocation
!
! macro: CORE_GET
!
!		This macro gets a block of memory from the
!		operating system of the specified size.  The
!		address of the block is returned as the value
!		of the macro.
!
!	CORE_GET (BLOCK_SIZE)
!
!	where BLOCK_SIZE is the number of fullwords to be allocated.

macro
    CORE_GET (BLKSIZE) =
	begin
	    literal $JBFF = %o '121',
		    $JBREL = %o '44';
	    local BLKADDR;
	    register T1;
	    builtin UUO;

	    BLKADDR = .$JBFF;		! Get current .JBFF value
	    if .$JBFF + (BLKSIZE) - 1 GTR .$JBREL then
	    begin
		T1 = .$JBFF + (BLKSIZE) - 1;
		if UUO (1,CORE(T1)) then
		begin
		    $JBFF = .$JBFF + (BLKSIZE);
		    .BLKADDR
		end
		else 0
	    end
	    else
	    begin
		$JBFF = .$JBFF + (BLKSIZE);
		.BLKADDR
	    end

	end %;

!<BLF/PAGE>
!
! Process sleep and wakeup
!
! macro: PROCESS_SLEEP
!
!		This macro puts the current process to
!		sleep for the specified amount of time.
!		The process is not guaranteed to sleep
!		the specified amount.
!
!	PROCESS_SLEEP (TIME)
!
!	where TIME is the number of seconds to sleep.

macro
    PROCESS_SLEEP (TIME) =
	begin
	    builtin UUO;
	    register T1;
	    T1 = TIME * 1000 + HB$RWP + HB$RWT;
	    UUO (1, HIBER(T1));
	end %;

!
! macro: PROCESS_WAKE
!
!		This macro wakes up the current process.
!		It may be called at interrupt level to
!		complement the PROCESS_SLEEP function.
!

macro
    PROCESS_WAKE =
    begin
	builtin
	    UUO;
	register
	    T1;

	T1 = 0; ! Wake up this job
	UUO (1,WAKE(T1));
    end %;

!
!<BLF/PAGE>
!
! IPCF functions
!macro
!    $MUTIL (LEN, ARGBLK, FUNC, ERROR) =
!
!         begin
!           builtin JSYS;
!           local RESULT;
!           register T1=1, T2=2;
!           T1 = LEN;
!           T2 = ARGBLK;
!           ARGBLK [0] = FUNC;
!           RESULT = JSYS (-1, MUTIL_, T1, T2);
!           ERROR = .T1;
!           .RESULT
!         end %;

macro
    $MSEND (LEN, PDB, ERROR) =
         begin
	   local RESULT;
           builtin UUO;
           register T1;
           T1 = LEN ^ 18 + PDB;
           RESULT = UUO (1, IPCFS$(T1));
           ERROR = .T1;
	   .RESULT
         end %;

macro
    $MRECV (LEN, PDB, ERROR) =
         begin
	   local RESULT;
           builtin UUO;
           register T1;
           T1 = LEN ^ 18 + PDB;
           RESULT = UUO (1, IPCFR$(T1));
           ERROR = .T1;
	   .RESULT
          end %;

!<BLF/PAGE>
!
! Network interface macros
!
! System specific fields for the LINK_INFO_BLOCK
!

macro
    $strblk (n) =
	$sub_block(1+(n+3)/4) %;

macro
    LINK_SYSTEM_SPECIFIC_FIELDS =
	LINK_NSP_CHN = [$integer],		! NSP link channel
	LINK_NSP_STATUS = [$integer],		! NSP status word
	LINK_READ_CONNECT_DATA = [$integer],	! Flag we read in connect data

!
! The following set of field definitions contains the complete set
! of arguments and data for an NSP. connect block.
!
	LINK_NSP_CBLK = [$sub_block (8)],	! NSP Connect block
! Individual fields are accessed by $NDxxx symbols

! Define storage for all the fields pointed to by the connect block
	 LINK_NSP_HOST = [$strblk (6)],		! Node name
	 LINK_NSP_SOURCE_PDB = [$sub_block (5)],! NSP source PDB
	  LINK_NSP_SRC_PN = [$strblk (16)],	! Process name string
	 LINK_NSP_DEST_PDB = [$sub_block (5)],	! NSP destination PDB
	  LINK_NSP_DST_PN = [$strblk (16)],	! Process name string
	 LINK_NSP_USERID = [$strblk (39)],	! User ID
	 LINK_NSP_PASSWD = [$strblk (39)],	! Password
	 LINK_NSP_ACCOUN = [$strblk (39)],	! Account string
	 LINK_NSP_DATA = [$strblk (16)]		! User data
	%,
    STRING_BLOCK (n) =
 block [1+(n*3)/4] field (STRING_BLOCK_FIELDS) %,
    INIT_STRING (ADDR, LENGTH) =
	STRBLK [ADDR, STRING_HEADER] = 1 + ( LENGTH + 3 ) / 4 %;

structure
    STRBLK [OFFSET, POS, SIZE; NUMCHARS] =
	[1 + (NUMCHARS + 3)/4]
	(STRBLK + OFFSET)<POS, SIZE>;

field
    STRING_BLOCK_FIELDS =
	set
	STRING_HEADER = [0, 0, 36],		! ** Contains next 2 fields
	LENGTH_CHARS = [0, 18, 18],		! Length in characters
	LENGTH_WORDS = [0, 0, 18],		! Length in words
	STRING = [1, 0, 36]			! Start of string
	tes;

!
! Macro: LOCAL_NODE_NUMBER
!
!		This macro returns the local node number.  It
!		puts it into a byte string pointed to by the
!		supplied byte pointer.
!
!	LOCAL_NODE_NUMBER (NODE_PTR)
!
!	where	NODE_PTR    is the address of a byte pointer that
!			    is updated when done.
!

macro
    LOCAL_NODE_NUMBER (NODE_PTR) =
	begin
	    builtin UUO;
	    local NTMAN_BLOCK : vector [$NTMAX];
	    register T1;

	    NTMAN_BLOCK [$NTCNT] = $NTMAX;
	    NTMAN_BLOCK [$NTENT] = $NTNOD;
	    NTMAN_BLOCK [$NTFNC] = $NTREX;	! Return local node number
	    NTMAN_BLOCK [$NTBPT] = .NODE_PTR;
	    NTMAN_BLOCK [$NTBYT] = 3;

	    T1 = NTMAN_BLOCK;
	    UUO (1, NTMAN$ (T1));

	    NODE_PTR = ch$plus (.NODE_PTR, 2);	! Don't forget to update this
	end %;

!
! macro: LOCAL_NODE_NAME
!
!		This macro returns the local node name in a
!		counted ASCII string.  The node name is written
!		into the string pointed to by the supplied byte
!		pointer and the first byte is the number of characters
!		in the node name.
!
!	LOCAL_NODE_NAME (NODE_PTR)
!
!	where	NODE_PTR    is the address of a byte pointer

macro
    LOCAL_NODE_NAME (NODE_PTR) =
	begin
	    builtin UUO;
	    register T1;
	    local
		NAME_BUFFER : vector [ch$allocation (8, 2 + 7)],
		NTMAN_BLOCK : vector [$NTMAX];

	    NTMAN_BLOCK [$NTCNT] = $NTMAX;
	    NTMAN_BLOCK [$NTENT] = $NTNOD;
	    NTMAN_BLOCK [$NTFNC] = $NTREX;	! Return local node number
	    NTMAN_BLOCK [$NTBPT] = ch$ptr (NAME_BUFFER,,8);
	    NTMAN_BLOCK [$NTBYT] = 3;

	    T1 = NTMAN_BLOCK;
	    UUO (1, NTMAN$ (T1));

	    NTMAN_BLOCK [$NTCNT] = $NTMAX;
	    NTMAN_BLOCK [$NTFNC] = $NTMAP;	! Map number to node id
	    NTMAN_BLOCK [$NTBPT] = ch$ptr (NAME_BUFFER,,8);
	    NTMAN_BLOCK [$NTBYT] = 9;

	    T1 = NTMAN_BLOCK;
	    UUO (1, NTMAN$ (T1));

	    ch$move (7, ch$ptr (NAME_BUFFER, 2, 8), .NODE_PTR);
	end %;

!
!	Set up arguments for NSP. by turning CONNECT_BLOCKs
!	into LINK_INFO blocks
!

macro
    BUILD_LINK_INFO_BLOCK (CONN_BLK, LINK_INFO) =
    begin
        bind LI = LINK_INFO : LINK_INFO_BLOCK,
	     LI_NSP = LI [LINK_NSP_CBLK] : vector [8],
	     LI_NSP_DST = LI [LINK_NSP_DEST_PDB] : vector [5],
	     LI_NSP_SRC = LI [LINK_NSP_SOURCE_PDB] : vector [5],
	     CB = CONN_BLK : CONNECT_BLOCK;

	external routine USER_NAME;

	LI [LINK_NSP_CHN] = 0;
	LI [LINK_READ_CONNECT_DATA] = 0; ! Say we haven't read connect data yet

! Set up all pointers in the Connect block
	LI_NSP [$NSCNL] = 8;
	LI_NSP [$NSCND] = LI [LINK_NSP_HOST];
	LI_NSP [$NSCSD] = LI [LINK_NSP_SOURCE_PDB];
	LI_NSP [$NSCDD] = LI [LINK_NSP_DEST_PDB];
	LI_NSP [$NSCUS] = LI [LINK_NSP_USERID];
	LI_NSP [$NSCPW] = LI [LINK_NSP_PASSWD];
	LI_NSP [$NSCAC] = LI [LINK_NSP_ACCOUN];
	LI_NSP [$NSCUD] = LI [LINK_NSP_DATA];

! Initialize the source Process Desrciptor Block
	LI_NSP_SRC [$NSDFL] = 3;
	LI_NSP_SRC [$NSDFM] = 0;
	LI_NSP_SRC [$NSDOB] = 0;
	LI_NSP_SRC [$NSDPP] = 0;
	LI_NSP_SRC [$NSDPN] = LI [LINK_NSP_SRC_PN];

! Initialize the destination Process Descriptor Block
	LI_NSP_DST [$NSDFL] = 3;
	LI_NSP_DST [$NSDFM] = 0;
	LI_NSP_DST [$NSDOB] = 0;
	LI_NSP_DST [$NSDPP] = 0;
	LI_NSP_DST [$NSDPN] = LI [LINK_NSP_DST_PN];

! Initialize all string blocks
	INIT_STRING (LI [LINK_NSP_HOST], 6);
	INIT_STRING (LI [LINK_NSP_SRC_PN], 16);
	INIT_STRING (LI [LINK_NSP_DST_PN], 16);
	INIT_STRING (LI [LINK_NSP_USERID], 39);
	INIT_STRING (LI [LINK_NSP_PASSWD], 39);
	INIT_STRING (LI [LINK_NSP_ACCOUN], 39);
	INIT_STRING (LI [LINK_NSP_DATA], 16);

! Set up strings in the Connect block
	begin

!
! Set up Node (or Host if you prefer) name
!
	    if .CB [CB_HOST_LENGTH] neq 0 then
	    begin

	    STRBLK [ LI [LINK_NSP_HOST], LENGTH_CHARS] = .CB [CB_HOST_LENGTH];
	    ch$move(.CB [CB_HOST_LENGTH],
			ch$plus(.CB [CB_HOST],3),
			ch$ptr(STRBLK [ LI [LINK_NSP_HOST], STRING],,8));

	    end;

!
!	Set up source PDB
!
	    if .CB [CB_TASK_LENGTH] neq 0 then
	    begin

		LI_NSP_SRC [$NSDFL] = 5;
		LI_NSP_SRC [$NSDFM] = 1;

		STRBLK [ LI [LINK_NSP_SRC_PN], LENGTH_CHARS] =
		 .CB [CB_TASK_LENGTH];
		ch$move(.CB [CB_TASK_LENGTH],
			.CB [CB_TASK],
			ch$ptr(STRBLK [ LI [LINK_NSP_SRC_PN], STRING],,8));

	    end
	    else
	    begin
		LI_NSP_SRC [$NSDFL] = 3;
		LI_NSP_SRC [$NSDFM] = 0;
		LI_NSP_SRC [$NSDOB] = 27;
	    end;

!
!	Set up destination PDB
!

	    if .CB [CB_OBJECT] eql 0 then
	    begin
		LI_NSP_DST [$NSDFL] = 5;
		LI_NSP_DST [$NSDFM] = 1;
		if .CB [CB_DESCRIPTOR_LENGTH] neq 0 then
		begin

		    STRBLK [ LI [LINK_NSP_DST_PN], LENGTH_CHARS] =
		     .CB [CB_DESCRIPTOR_LENGTH];
		    ch$move(.CB [CB_DESCRIPTOR_LENGTH],
			    .CB [CB_DESCRIPTOR],
			    ch$ptr(STRBLK [ LI [LINK_NSP_DST_PN], STRING],,8));

		end;
	    end
	    else LI_NSP_DST [$NSDOB] = .CB [CB_OBJECT];

!
!	Add optional userid attribute
!
	    if .CB [CB_USERID_LENGTH] neq 0 then
	    begin

		STRBLK [ LI [LINK_NSP_USERID], LENGTH_CHARS] =
		 .CB [CB_USERID_LENGTH];
		ch$move(.CB [CB_USERID_LENGTH],
			.CB [CB_USERID],
			ch$ptr(STRBLK [ LI [LINK_NSP_USERID], STRING],,8));

	    end;

!
!	Add optional password attribute
!
	    if .CB [CB_PASSWORD_LENGTH] neq 0 then
	    begin

		STRBLK [ LI [LINK_NSP_PASSWD], LENGTH_CHARS] =
		 .CB [CB_PASSWORD_LENGTH];
		ch$move(.CB [CB_PASSWORD_LENGTH],
			.CB [CB_PASSWORD],
			ch$ptr(STRBLK [ LI [LINK_NSP_PASSWD], STRING],,8));

	    end;

!
!	Add optional account attribute
!
	    if .CB [CB_ACCOUNT_LENGTH] neq 0 then
	    begin

		STRBLK [ LI [LINK_NSP_ACCOUN], LENGTH_CHARS] =
		 .CB [CB_ACCOUNT_LENGTH];
		ch$move(.CB [CB_ACCOUNT_LENGTH],
			.CB [CB_ACCOUNT],
			ch$ptr(STRBLK [ LI [LINK_NSP_ACCOUN], STRING],,8));


	    end;

!
!	Add optional data attribute
!
	    if .CB [CB_DATA_LENGTH] neq 0 then
	    begin

		STRBLK [ LI [LINK_NSP_DATA], LENGTH_CHARS] =
		 .CB [CB_DATA_LENGTH];
		ch$move(.CB [CB_DATA_LENGTH],
			.CB [CB_DATA],
			ch$ptr(STRBLK [ LI [LINK_NSP_DATA], STRING],,8));

	    end;

	end
    end	%;

!
! Macro - OPEN_FOR_CONNECTION
!
! Function - This macro opens a logical link.  If it is a source
!            link, the connect is sent.  If it is a target link
!            it opens for possible connection.
!
! Parameters -
!
!    LINK_INFO    Address of link info block
!
! Return value -
!
!    $true    Link is setup for connection properly
!    $false   Link setup failed

macro
    OPEN_FOR_CONNECTION (LINK_INFO) =
    begin
        builtin UUO;
        register T1;
	external
	    DATTAB : vector [10],
	    VECTAB : vector [10],
	    NETLNK : vector [10],
	    PIVEC : blockvector [6, 4];
        bind LI = LINK_INFO : LINK_INFO_BLOCK;
	local NSPARG : vector [5], PISARG : vector [3];
	own LINK_INTERRUPT_CHANNEL : initial (-1);

!
!   Get channel for link
!
	NSPARG [$NSAA1] = LI [LINK_NSP_CBLK];
	NSPARG [$NSAA2] = 0;
	NSPARG [$NSAA3] = 0;

	if .LI [LINK_TYPE] eql SOURCE_LINK
	then NSPARG [$NSAFN] = $NSFEA ^ 18 + 5
	else NSPARG [$NSAFN] = $NSFEP ^ 18 + 5;

        T1 = NSPARG;
        if UUO (1, NSP$(T1))
	then
	begin
	    LI [LINK_NSP_CHN] = .NSPARG [$NSACH] and %o'777777';
	    ALLOCATE_NETLNK (.NSPARG [$NSACH] and %o '777777', LI);
!
!	Set up the PI system
!

	    if .LINK_INTERRUPT_CHANNEL eql -1
	    then
	    begin
		LINK_INTERRUPT_CHANNEL =
		ALLOCATE_INTERRUPT_CHANNEL (NETWORK_EVENT,
					    0);

		DATTAB [.LINK_INTERRUPT_CHANNEL] = PIVEC + $PSVIS + 4 *
						   .LINK_INTERRUPT_CHANNEL;

		PISARG [0] = $PCNSP;
		PISARG [1] = (.LINK_INTERRUPT_CHANNEL * 4) ^ 18;
		PISARG [2] = 0;

		T1 = PS$FAC + PISARG;
		UUO (1, PISYS$(T1))
	    end; ! End of  if .LINK_INTERRUPT_CHANNEL eql -1

	    NSPARG [$NSAFN] = $NSFPI ^ 18 + 3;
	    NSPARG [$NSAA1] = %o'777777';

	    T1 = NSPARG;
	    if UUO (1, NSP$(T1)) then $true else $false
	end
	else
	begin
	    %debug (NETWORK_TRANSITIONS,
		    (TRACE_INFO ('NSP UUO did not skip. Reason: %O',.T1)));
	    $false
	end
    end
            %;

macro
    ACCEPT_NETWORK_CONNECT (LINK_INFO, DATA_LEN, DATA_PTR) =
	begin
	    bind LI = LINK_INFO : LINK_INFO_BLOCK;

	    begin
	    builtin UUO;
	    local NSPARG : vector [3],
		  USER_DATA : STRING_BLOCK (16);
	    register T1;

	    INIT_STRING (USER_DATA, 16);
	    STRBLK [USER_DATA, LENGTH_CHARS] = DATA_LEN;
	    ch$move (DATA_LEN,
		     DATA_PTR,
		     ch$ptr(STRBLK [USER_DATA, STRING],, 8));

	    NSPARG [$NSAFN] = $NSFAC ^ 18 + 3;
	    NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
	    NSPARG [$NSAA1] = USER_DATA;
	    T1 = NSPARG;
	    UUO (1, NSP$(T1));
	    end;
	    begin
	    local
		 WAITING ;

            WAITING = $TRUE ;
            while .WAITING
            do begin
               READ_LINK_STATUS (LINK_INFO) ;
               if (WAITING = not ((LINK_CONNECTED (LINK_INFO)) or
                                  (LINK_DISCONNECTED (LINK_INFO))))
               then NMU$SCHED_SLEEP (1) ;
               end;
            end;
	end %;

macro
    REJECT_NETWORK_CONNECT (LINK_INFO, REASON, DATA_LEN, DATA_PTR) =
	begin
	    bind LI = LINK_INFO : LINK_INFO_BLOCK;

	    builtin UUO;
	    local NSPARG : vector [3],
		  USER_DATA : STRING_BLOCK (16);
	    register T1;

	    INIT_STRING (USER_DATA, 16);
	    ch$move (DATA_LEN,
		     DATA_PTR,
		     ch$ptr(STRBLK [USER_DATA, STRING],, 8));

	    STRBLK [USER_DATA, LENGTH_CHARS] = DATA_LEN;

	    NSPARG [$NSAFN] = $NSFRJ ^ 18 + 3;
	    NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
	    NSPARG [$NSAA1] = USER_DATA;
	    T1 = NSPARG;
	    UUO (1, NSP$(T1));
	end %;

macro
    LINK_OPEN (LINK_INFO) =
	begin
	    bind LI = LINK_INFO : LINK_INFO_BLOCK,
		 LS = LI [LINK_NSP_STATUS];

	    (if .LI [LINK_TYPE] eql SOURCE_LINK
	     then (POINTR(.LS, NS$STA) eql $NSSRN)
	     else (POINTR(.LS, NS$STA) eql $NSSCR))
	end %;

macro
    LINK_CONNECTED (LINK_INFO) =
	begin
	    bind LI = LINK_INFO : LINK_INFO_BLOCK,
		 LS = LI [LINK_NSP_STATUS];

	    (POINTR (.LS, NS$STA) eql $NSSRN)
	end %;

macro
    LINK_DISCONNECTED (LINK_INFO) =
        begin
            bind LI = LINK_INFO : LINK_INFO_BLOCK,
		 LS = LI [LINK_NSP_STATUS];

            (
! **** Do Soon ****
! Figure out how RJ and DR states relate to this mess!
!	     ((.LS and NS$LWU) neq 0)
!           or
            (POINTR (.LS, NS$STA) eql $NSSDR)
            or
            (POINTR (.LS, NS$STA) eql $NSSLK))
        end %;

macro
    CONNECT_WAIT (LINK_INFO) =
	begin
	    bind LI = LINK_INFO : LINK_INFO_BLOCK,
		 LS = LI [LINK_NSP_STATUS];

	    (if .LI [LINK_TYPE] eql SOURCE_LINK
	     then (POINTR(.LS, NS$STA) eql $NSSCS)
	     else (POINTR(.LS, NS$STA) eql $NSSCW))
	end %;

macro
    READ_MESSAGE (LINK_INFO, BUFFER_LEN, BUFFER_PTR) =
    begin
	builtin UUO;
	bind LI = LINK_INFO : LINK_INFO_BLOCK,
	     LS = LI [LINK_NSP_STATUS];
	local CHAR_READ;
!	local CHAR_READ, READ_WAIT;

	CHAR_READ = 0;

	while $TRUE do
	begin
	    local NSPARG : vector [4];
	    register T1;
	    NSPARG [$NSAFN] = $NSFDR ^ 18 + 5;
	    NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
	    NSPARG [$NSAA1] = BUFFER_LEN;
	    NSPARG [$NSAA2] = BUFFER_PTR;
	    T1 = NSPARG;
	    if not UUO (1, NSP$(T1)) then return -2;	!Error occured
	    CHAR_READ = BUFFER_LEN - .NSPARG [$NSAA1];

	    if (.CHAR_READ neq 0) or ((.NSPARG [$NSAFN] and NS$EOM) neq 0)
            then exitloop;

	    if not NMU$SCHED_WAIT (LI [LINK_EVENT], 2*.ntimo) then return -1;
	end;

	.CHAR_READ
    end
%;

macro
    WRITE_MESSAGE (LINK_INFO, BUFFER_LEN, BUFFER_PTR) =
    begin
	bind LI = LINK_INFO : LINK_INFO_BLOCK,
	     LS = LI [LINK_NSP_STATUS];
	builtin
	    UUO;
	local
	    RESULT,
	    NSPARG : vector [4];
	register
	    T1;

	NSPARG [$NSAFN] = NS$EOM + $NSFDS ^ 18 + 4;
	NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
	NSPARG [$NSAA1] = BUFFER_LEN;
	NSPARG [$NSAA2] = BUFFER_PTR;
	T1 = NSPARG;

	while ((RESULT = UUO (1, NSP$(T1))) and .NSPARG [$NSAA1] neq 0) do
	begin
	    NMU$SCHED_SLEEP (2);
	    T1 = NSPARG;
	end;

	.RESULT
    end %;

macro
    WRITE_STRING (LINK_INFO, BUFFER_LEN, BUFFER_PTR) =
	begin
	    bind LI = LINK_INFO : LINK_INFO_BLOCK;
	    builtin UUO;
	    local WRITE_WAIT, RESULT;

	    WRITE_WAIT = $true;

	    while .WRITE_WAIT do
	    begin
		READ_LINK_STATUS (LINK_INFO);
		if LINK_CONNECTED (LINK_INFO)
		then
		    if not
			begin
			local NSPARG : vector [5];
			register T1;
			NSPARG [$NSAFN] = $NSFRS ^ 18 + 5;
			NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
			T1 = NSPARG;
			UUO (1, NSP$(T1));
			if (NS$NDR and .NSPARG [$NSACH]) eql 0
			then $true
			else $false
			end
		    then NMU$SCHED_SLEEP (2)
		    else
			begin
			local NSPARG : vector [5];
			register T1;
			NSPARG [$NSAFN] = $NSFDS ^ 18 + 5;
			NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
			NSPARG [$NSAA1] = BUFFER_LEN;
			NSPARG [$NSAA2] = BUFFER_PTR;
			T1 = NSPARG;
			RESULT  = UUO (1, NSP$(T1));
			WRITE_WAIT = $false;
			end
		else WRITE_WAIT = $false;
	    end;
	.RESULT
	end %;

macro
    ABORT_LINK (LINK_INFO, REASON, DATA_LEN, DATA_PTR) =
	begin
	    bind LI = LINK_INFO : LINK_INFO_BLOCK;

	    builtin UUO;
	    local NSPARG : vector [5],
		  DATA : STRING_BLOCK (16);
	    register T1;

	    INIT_STRING (DATA, 16);

	    STRBLK [DATA, LENGTH_CHARS] = DATA_LEN;
	    ch$move (DATA_LEN,
		     DATA_PTR,
		     ch$ptr(STRBLK [DATA, STRING],, 8));

	    NSPARG [$NSAFN] = $NSFPI ^ 18 + 3;
	    NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
	    NSPARG [$NSAA1] = 0;
	    T1 = NSPARG;
	    UUO (1, NSP$(T1));

	    NSPARG [$NSAFN] = $NSFAB ^ 18 + 5;
	    NSPARG [$NSAA1] = DATA;
	    T1 = NSPARG;
	    if not UUO (1, NSP$(T1))
	    then
		begin
		    NSPARG [$NSAFN] = $NSFRL ^ 18 + 5;
		    T1 = NSPARG;
		    UUO (1, NSP$(T1));
		end;

	    DEALLOCATE_NETLNK (.LI[LINK_NSP_CHN] and %o '777777');
	end %;

macro
    CLOSE_LINK (A, DATA_LEN, DATA_PTR) =
	begin
	    builtin UUO;
	    local NSPARG : vector [3],
		  DATA : STRING_BLOCK (16);
	    register T1;

	    INIT_STRING (DATA, 16);

	    NSPARG [$NSAFN] = $NSFPI ^ 18 + 3;
	    NSPARG [$NSACH] = .LINK_INFO [LINK_NSP_CHN];
	    NSPARG [$NSAA1] = 0;
	    T1 = NSPARG;
	    UUO (1, NSP$(T1));
	    DEALLOCATE_NETLNK (.LINK_INFO [LINK_NSP_CHN] and %o '777777');

	    STRBLK [DATA, LENGTH_CHARS] = DATA_LEN;
	    ch$move (DATA_LEN, DATA_PTR, ch$ptr(STRBLK[DATA, STRING],, 8));

	    NSPARG [$NSAFN] = $NSFSD ^ 18 + 3;	! Synchronus disconnect
	    NSPARG [$NSACH] = .LINK_INFO [LINK_NSP_CHN];
	    NSPARG [$NSAA1] = DATA;
	    T1 = NSPARG;
	    UUO (1, NSP$(T1));

	    while $TRUE do	! Loop till we get a DC or UUO fails
	    begin
		NSPARG [$NSAFN] = $NSFRS ^ 18 + 2;
		T1 = NSPARG;
		if not UUO (1, NSP$(T1)) then exitloop;
		if (.NSPARG [$NSACH] and NS$STA) eql $NSSDS ^ 18 then
		 NMU$SCHED_SLEEP (5) else exitloop;
	    end;

		NSPARG [$NSAFN] = $NSFRL ^ 18 + 2;
		T1 = NSPARG;
		UUO (1, NSP$(T1));
	end %;

macro
    READ_LINK_STATUS (LINK_INFO) =
	begin
	    bind LI = LINK_INFO : LINK_INFO_BLOCK;
	    builtin UUO;
	    local NSPARG : vector [5];
	    register T1;

	    NSPARG [$NSAFN] = $NSFRS ^ 18 + 5;
	    NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
	    T1 = NSPARG;
	    if not UUO (1, NSP$(T1)) then NSPARG [$NSACH] = 0;

	    LI [LINK_NSP_STATUS] = .NSPARG[$NSACH];
	end %;

macro
    READ_CONNECT_DATA (INFO_BLOCK) =
	begin
	    bind LI = INFO_BLOCK : LINK_INFO_BLOCK,
		 LI_DST_PDB = LI [LINK_NSP_DEST_PDB] : vector [5],
		 LI_SRC_PDB = LI [LINK_NSP_SOURCE_PDB] : vector [5];
	    if .LI [LINK_READ_CONNECT_DATA] eql 0 then
	    begin
		builtin UUO;
		local NSPARG : vector [5];
		register T1;

		LI [LINK_READ_CONNECT_DATA] = 1;

		LI_DST_PDB [$NSDFL] = LI_SRC_PDB [$NSDFL] = 5;
		NSPARG [$NSAFN] = $NSFRI ^ 18 + 5;
		NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
		NSPARG [$NSAA1] = LI [LINK_NSP_CBLK];
		NSPARG [$NSAA2] = 0;
		NSPARG [$NSAA3] = 0;
		T1 = NSPARG;
		UUO (1, NSP$(T1));
		if .STRBLK [ LI [LINK_NSP_HOST], LENGTH_CHARS] eql 0 then
		begin
		  external routine NMU$TEXT;
		  UUO(0, PJOB(T1));
		  NSPARG [0] = $DNSLS ^ 18 + $DNNOD + 1;
		  NSPARG [$DNJCN] = .T1 ^ 18 + .LI[LINK_NSP_CHN];
		  T1 = NSPARG;
		  UUO (1, DNET$(T1));
		  NSPARG[$DNNOD+1] = .NSPARG[$DNNOD]<0,10,0>;
		  NSPARG[$DNNOD] = .NSPARG[$DNNOD]<10,6,0>;
		  STRBLK [ LI [LINK_NSP_HOST], LENGTH_CHARS] = NMU$TEXT(
			 %ref(ch$ptr(STRBLK [ LI [LINK_NSP_HOST], STRING],,8)),
			6,ch$ptr(uplit(%asciz '%D.%D')),2,NSPARG[$DNNOD]);
		end;
	    end ;
	end
    %;

macro
    READ_USER_NAME (CONN_BLOCK, INFO_BLOCK) =
	begin
	    bind CB = CONN_BLOCK : CONNECT_BLOCK,
		 LI = INFO_BLOCK : LINK_INFO_BLOCK;

	    READ_CONNECT_DATA (INFO_BLOCK);

	    CB [CB_USERID] = ch$ptr (CB [CB_USERID_BUFFER] ,, 8);
	    ch$move (.STRBLK [ LI [LINK_NSP_USERID], LENGTH_CHARS],
		     ch$ptr (STRBLK [ LI [LINK_NSP_USERID], STRING],,8),
		     .CB [CB_USERID]);

	    CB [CB_USERID_LENGTH] =
	     .STRBLK [ LI [LINK_NSP_USERID], LENGTH_CHARS];
	end %;

macro
    READ_ACCOUNT_STRING (CONN_BLOCK, INFO_BLOCK) =
	begin
	    bind CB = CONN_BLOCK : CONNECT_BLOCK,
		 LI = INFO_BLOCK : LINK_INFO_BLOCK;

	    READ_CONNECT_DATA (INFO_BLOCK);

	    CB [CB_ACCOUNT] = ch$ptr (CB [CB_ACCOUNT_BUFFER],, 8);
	    ch$move (.STRBLK [ LI [LINK_NSP_ACCOUN], LENGTH_CHARS],
		     ch$ptr (STRBLK [ LI [LINK_NSP_ACCOUN], STRING],,8),
		    .CB [CB_ACCOUNT]);
	    CB [CB_ACCOUNT_LENGTH] =
	     .STRBLK [ LI [LINK_NSP_ACCOUN], LENGTH_CHARS];
	end %;

macro
    READ_PASSWORD_STRING (CONN_BLOCK, INFO_BLOCK) =
	begin
	    bind CB = CONN_BLOCK : CONNECT_BLOCK,
		 LI = INFO_BLOCK : LINK_INFO_BLOCK;

	    READ_CONNECT_DATA (INFO_BLOCK);

	    CB [CB_PASSWORD] = ch$ptr (CB [CB_PASSWORD_BUFFER],, 8);
	    ch$move (.STRBLK [ LI [LINK_NSP_PASSWD], LENGTH_CHARS],
		     ch$ptr (STRBLK [ LI [LINK_NSP_PASSWD], STRING],,8),
		    .CB [CB_PASSWORD]);
	    CB [CB_PASSWORD_LENGTH] =
	     .STRBLK [ LI [LINK_NSP_PASSWD], LENGTH_CHARS];
	end %;

macro
    READ_OPTIONAL_DATA (CONN_BLOCK, INFO_BLOCK) =
	begin
	    bind CB = CONN_BLOCK : CONNECT_BLOCK,
		 LI = INFO_BLOCK : LINK_INFO_BLOCK;

	    READ_CONNECT_DATA (INFO_BLOCK);

	    CB [CB_DATA] = ch$ptr (CB [CB_DATA_BUFFER],, 8);
	    ch$move (.STRBLK [ LI [LINK_NSP_DATA], LENGTH_CHARS],
		     ch$ptr (STRBLK [ LI [LINK_NSP_DATA], STRING],,8),
		    .CB [CB_DATA]);
	    CB [CB_DATA_LENGTH] = .STRBLK [ LI [LINK_NSP_DATA], LENGTH_CHARS];
	end %;

macro
    READ_OBJECT_TYPE (CONN_BLOCK, INFO_BLOCK) =
	begin
	    bind CB = CONN_BLOCK : CONNECT_BLOCK,
		 LI = INFO_BLOCK : LINK_INFO_BLOCK,
		 LI_NSP_DST = LI [LINK_NSP_DEST_PDB] : vector [5];

	    READ_CONNECT_DATA (INFO_BLOCK);

	    CB [CB_OBJECT] = .LI_NSP_DST [$NSDOB];
	end %;

macro
    READ_HOST_ID (CONN_BLOCK, INFO_BLOCK) =
	begin
	    bind CB = CONN_BLOCK : CONNECT_BLOCK,
		 LI = INFO_BLOCK : LINK_INFO_BLOCK;

	    READ_CONNECT_DATA (INFO_BLOCK);

	    CB [CB_HOST] = ch$ptr (CB [CB_HOST_BUFFER],, 8);
	    CB [CB_HOST_LENGTH] = 3 + .STRBLK[ LI[LINK_NSP_HOST],LENGTH_CHARS];

	    PUTB ( 0, CB [CB_HOST]);
	    PUTB ( 0, CB [CB_HOST]);

	    PUTB ( .CB [CB_HOST_LENGTH] - 3, CB [CB_HOST]);

	    ch$move (.CB [CB_HOST_LENGTH],
		     ch$ptr (STRBLK [ LI [LINK_NSP_HOST], STRING],,8),
		    .CB [CB_HOST]);

	    CB [CB_HOST] = ch$ptr (CB [CB_HOST_BUFFER],, 8);
	end %;

macro
    READ_DESCRIPTOR (CONN_BLOCK, INFO_BLOCK) =
	begin
	    bind CB = CONN_BLOCK : CONNECT_BLOCK,
		 LI = INFO_BLOCK : LINK_INFO_BLOCK;

	    READ_CONNECT_DATA (INFO_BLOCK);

	    CB [CB_DESCRIPTOR] = ch$ptr (CB [CB_DESCRIPTOR_BUFFER],, 8);
	    ch$move (.STRBLK [ LI [LINK_NSP_DST_PN], LENGTH_CHARS],
		     ch$ptr (STRBLK [ LI [LINK_NSP_DST_PN], STRING],,8),
		    .CB [CB_DESCRIPTOR]);
	    CB [CB_DESCRIPTOR_LENGTH] =
	     .STRBLK [ LI [LINK_NSP_DST_PN], LENGTH_CHARS];
	end %;

macro
    READ_REJECT_CODE (CONN_BLOCK, INFO_BLOCK) =
	begin
	    bind CB = CONN_BLOCK : CONNECT_BLOCK,
		 LI = INFO_BLOCK : LINK_INFO_BLOCK,
		 LS = LI [LINK_NSP_STATUS];
	    local NSPARG : vector [4];
	    register T1;
	    builtin UUO;

	    NSPARG [$NSAFN] = $NSFRD ^ 18 + 4;
	    NSPARG [$NSACH] = .LI [LINK_NSP_CHN];
	    NSPARG [$NSAA2] = 0;

	    T1 = NSPARG;
	    if not UUO (1, NSP$(T1)) then
	    begin
		bind
		    STATE_TO_REJECT_MAP = uplit (
			0,	! 0
			0,	! .NSSCW==1 ;Connect Wait
			0,	! .NSSCR==2 ;Connect Received
			0,	! .NSSCS==3 ;Connect Sent
			7,	! .NSSRJ==4 ;Remote node rejected Connect Init
			0,	! .NSSRN==5 ;Link is Up and Running
			9,	! .NSSDR==6 ;Disconnect Received
			0,	! .NSSDS==7 ;Disconnect Sent
			0,	! .NSSDC==10 ;Disconnect Confirmed
			38,	! .NSSCF==11 ;No Confidence
			38,	! .NSSLK==12 ;No Link
			39,	! .NSSCM==13 ;No Communication
			32	! .NSSNR==14 ;No Resources
				) : vector [%o '15'];

		NSPARG [$NSAA2] = .STATE_TO_REJECT_MAP [POINTR (.LS, NS$STA)];
	    end;

	    CB [CB_REJECT_CODE] = .NSPARG [$NSAA2];
	end %;

macro
    NETWORK_INTERRUPT_CLEAR (LINK_INFO) =
	%;

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