--********************************************************************************************************************
-- Created:  9-Mar-2021 22:28:18 by OpenVMS SDL EV3-3      
-- Source:  24-OCT-1994 14:54:28 $1$DGA8085:[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.
--     
---
 
    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_M_CLONE			: constant := 16#00000100#;
 
    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
	    CLONE	: BOOLEAN;					--  Clone channel after Posix fork()
	    FILLER_1	: UNSIGNED_23;
	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;
		    CLONE	at 1 range 0 .. 0;
		    FILLER_1	at 1 range 1 .. 23;
		end record;
	    for CCB_STS_TYPE'SIZE use 32;
 
    CCB_STS_TYPE_INIT : constant CCB_STS_TYPE := 
	    (AMB	=> FALSE,
	    IMGTMP	=> FALSE,
	    RDCHKDON	=> FALSE,
	    WRTCHKDON	=> FALSE,
	    LOGCHKDON	=> FALSE,
	    PHYCHKDON	=> FALSE,
	    NOREADACC	=> FALSE,
	    NOWRITEACC	=> FALSE,
	    CLONE	=> FALSE,
	    FILLER_1	=> 0);
 
    type CCB_TYPE is
	record
	    UCB		: ADDRESS;					-- ADDRESS OF ASSIGNED DEVICE UCB 
	    STS		: CCB_STS_TYPE;					-- CHANNEL STATUS 
	    IOC		: UNSIGNED_LONGWORD;				--  Number of outstanding I/O requests on channel 
	    DIRP	: ADDRESS;					-- DEACCESS I/O REQUEST PACKET ADDRESS 
	    AMOD	: INTEGER_8;					-- ACCESS MODE THAT ASSIGNED CHANNEL 
	    FILLER_1	: UNSIGNED_BYTE;
	    FILLER_2	: UNSIGNED_WORD;
	    WIND	: ADDRESS;					--  Address of Window Control Block
	    CHAN	: INTEGER_32;					--  associated channel number
 
	    ----Component(s) below are defined as comments since they
	    ----overlap other fields
	    ----
	    ----CHAN	: UNSIGNED_WORD;
 
	    FILLER_3	: UNSIGNED_LONGWORD;
	end record;
 
	    for CCB_TYPE use 
		record
		    UCB		at 0 range 0 .. 31;
		    STS		at 4 range 0 .. 31;
		    IOC		at 8 range 0 .. 31;
		    DIRP	at 12 range 0 .. 31;
		    AMOD	at 16 range 0 .. 7;
		    FILLER_1	at 17 range 0 .. 7;
		    FILLER_2	at 18 range 0 .. 15;
		    WIND	at 20 range 0 .. 31;
		    CHAN	at 24 range 0 .. 31;
 
		    ----Component representation spec(s) below are defined as
		    ----comments since they overlap other fields
		    ----
		    ----CHAN	at 24 range 0 .. 15;
 
		    FILLER_3	at 28 range 0 .. 31;
		end record;
	    for CCB_TYPE'SIZE use 256;
 
    CCB_TYPE_INIT : constant CCB_TYPE := 
	    (UCB	=> ADDRESS_ZERO,
	    STS		=> CCB_STS_TYPE_INIT,
	    IOC		=> 0,
	    DIRP	=> ADDRESS_ZERO,
	    AMOD	=> 0,
	    FILLER_1	=> 0,
	    FILLER_2	=> 0,
	    WIND	=> ADDRESS_ZERO,
	    CHAN	=> 0,
	    FILLER_3	=> 0);
 
    CCB_K_LENGTH		: constant := 32;			-- LENGTH OF CCB 
    CCB_S_CCBDEF		: constant := 32;			-- OLD SIZE NAME, SYNONYM FOR CCB$S_CCB
 
end CCBDEF;