--
--****************************************************************************
--*                                                                          *
--*  Copyright (c) 2001                                                      *
--*  by DIGITAL Equipment Corporation, Maynard, Mass.                        *
--*                                                                          *
--*  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.                 *
--*                                                                          *
--****************************************************************************
--********************************************************************************************************************
-- Created: 15-MAR-2001 22:50:24 by OpenVMS SDL EV1-33     
-- Source:  28-FEB-1991 19:12:36 $11$DUA933:[LIB_ADA.LIS]CCBDEF.SDL;1 
--********************************************************************************************************************
with SYSTEM; use SYSTEM;
with STARLET; use STARLET;
with CONDITION_HANDLING; use CONDITION_HANDLING;
 
package CCBDEF is
 
--  module $CCBDEF
 
--+
-- CCB - CHANNEL CONTROL BLOCK
--
-- THERE IS ONE CHANNEL CONTROL BLOCK FOR EACH SOFTWARE CHANNEL THAT A
-- PROCESS MAY INITIATE I/O REQUESTS ON. THE NUMBER OF SUCH I/O CHANNELS
-- IS DETERMINED BY THE FIXED NUMBER ASSIGNED TO A PROCESS PLUS ANY
-- ADDITIONAL CHANNELS REQUIRED BY THE IMAGE CURRENTLY BEING EXECUTED
-- BY THE PROCESS.
--     
-- **** WARNING ****
--        THE CHANNEL CONTROL BLOCK IS ASSUMED TO BE FOUR LONG WORDS
-- THROUGHOUT THE EXEC.  ITS SIZE MAY BE CHANGED BUT ONLY BY POWERS OF 2.
---
 
    CCB_M_AMB			: constant := 16#00000001#;
    CCB_M_IMGTMP		: constant := 16#00000002#;
    CCB_M_RDCHKDON		: constant := 16#00000004#;
    CCB_M_WRTCHKDON		: constant := 16#00000008#;
    CCB_M_LOGCHKDON		: constant := 16#00000010#;
    CCB_M_PHYCHKDON		: constant := 16#00000020#;
    CCB_M_NOREADACC		: constant := 16#00000040#;
    CCB_M_NOWRITEACC		: constant := 16#00000080#;
    CCB_K_LENGTH		: constant := 16;			-- LENGTH OF CCB 
    CCB_C_LENGTH		: constant := 16;			-- LENGTH OF CCB 
 
    type CCB_STS_TYPE is						-- CHANNEL STATUS 
	record
	    AMB		: BOOLEAN;					--  MAILBOX ASSOCIATED WITH CHANNEL 
	    IMGTMP	: BOOLEAN;					--  IMAGE TEMPORARY
	    RDCHKDON	: BOOLEAN;					--  READ PROTECTION CHECK COMPLETED
	    WRTCHKDON	: BOOLEAN;					--  WRITE PROTECTION CHECK COMPLETED
	    LOGCHKDON	: BOOLEAN;					--  LOGICAL I/O ACCESS CHECK DONE
	    PHYCHKDON	: BOOLEAN;					--  PHYSICAL I/O ACCESS CHECK DONE
	    NOREADACC	: BOOLEAN;					--  READ ACCESS TO DEVICE DISABLED
	    NOWRITEACC	: BOOLEAN;					--  WRITE ACCESS TO DEVICE DISABLED
	end record;
 
	    for CCB_STS_TYPE use 
		record
		    AMB		at 0 range 0 .. 0;
		    IMGTMP	at 0 range 1 .. 1;
		    RDCHKDON	at 0 range 2 .. 2;
		    WRTCHKDON	at 0 range 3 .. 3;
		    LOGCHKDON	at 0 range 4 .. 4;
		    PHYCHKDON	at 0 range 5 .. 5;
		    NOREADACC	at 0 range 6 .. 6;
		    NOWRITEACC	at 0 range 7 .. 7;
		end record;
	    for CCB_STS_TYPE'SIZE use 8;
 
    CCB_STS_TYPE_INIT : constant CCB_STS_TYPE := 
	    (AMB	=> FALSE,
	    IMGTMP	=> FALSE,
	    RDCHKDON	=> FALSE,
	    WRTCHKDON	=> FALSE,
	    LOGCHKDON	=> FALSE,
	    PHYCHKDON	=> FALSE,
	    NOREADACC	=> FALSE,
	    NOWRITEACC	=> FALSE);
 
    type CCB_TYPE is
	record
	    UCB		: UNSIGNED_LONGWORD;				-- ADDRESS OF ASSIGNED DEVICE UCB 
	    WIND	: UNSIGNED_LONGWORD;				-- ADDRESS OF WINDOW BLOCK 
	    STS		: CCB_STS_TYPE;					-- CHANNEL STATUS 
	    AMOD	: UNSIGNED_BYTE;				-- ACCESS MODE THAT ASSIGNED CHANNEL 
	    IOC		: UNSIGNED_WORD;				-- NUMBER OF OUTSTANDING I/O REQUESTS ON CHANNEL 
	    DIRP	: UNSIGNED_LONGWORD;				-- DEACCESS I/O REQUEST PACKET ADDRESS 
	end record;
 
	    for CCB_TYPE use 
		record
		    UCB		at 0 range 0 .. 31;
		    WIND	at 4 range 0 .. 31;
		    STS		at 8 range 0 .. 7;
		    AMOD	at 9 range 0 .. 7;
		    IOC		at 10 range 0 .. 15;
		    DIRP	at 12 range 0 .. 31;
		end record;
	    for CCB_TYPE'SIZE use 128;
 
    CCB_TYPE_INIT : constant CCB_TYPE := 
	    (UCB	=> 0,
	    WIND	=> 0,
	    STS		=> CCB_STS_TYPE_INIT,
	    AMOD	=> 0,
	    IOC		=> 0,
	    DIRP	=> 0);
 
end CCBDEF;