S0CCW

Prolog  

Control Block Contents  
   S0CCW DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

S0CCW Prolog

 NAME       : HCPS0CCW
 DESCRIPTION: SPOOLing Format 0 Channel Control
              Word Pairs
 DSECT      : S0CCW
 FUNCTION   : Provide symbolic references for the fields of
              the format 0 (370) CCW pairs used by spooling
              in the spool files.  The format 0 CCW is used
              when working with VM/SP spool files.  This
              definition corresponds to the VM/SP CCW pair
              usage.
 LOCATED BY : N/A
 CREATED BY : N/A
 DELETED BY : N/A
 RELOCATION CONSIDERATIONS : None

S0CCW Control Block Content

S0CCW DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      S0CCW          SPOOLing Format 0 Channel Control
0000    0 Bitstring   12 S0CCWPAR (0)   FORMAT 0 (System 370 CCW Pair)
0000    0 Signed       4 S0CCWWD0 (0)   First word of CCW pair
0000    0 Bitstring    1 S0CCWCMD       CCW command code
0001    1 Address      3 S0CCWADR       CCW address (24-BIT)
0004    4 Signed       4 S0CCWWD1 (0)   Second word of CCW pair
0004    4 Bitstring    1 S0CCWFLG       Control of CCW flags
          1... ....      CCWDC          X'80' CCWDC CHAIN DATA ADDRESS
                                        AND COUNT
          .1.. ....      CCWCC          X'40' CCWCC COMMAND CHAIN
          ..1. ....      CCWSILI        X'20' CCWSILI SUPPRESS INCORRECT
                                        LENGTH
          ...1 ....      CCWSKIP        X'10' CCWSKIP SUPPRESS INBOUND
                                        DATA TRANSFER
          .... 1...      CCWPCIR        X'08' CCWPCIR REQUEST PC
                                        INTERRUPTION
          .... .1..      CCWIDA         X'04' CCWIDA INDIRECT DATA
                                        ADDRESSING
          .... ..11      CCWINVAL       X'03' CCWINVAL I/O UNDEFINED PAIR
                                        OF BITS
          .... ..1.      CCWSUSPN       X'02' CCWSUSPN I/O
                                        SUSPENSION/RESUMPTION The
                                        CCWUNDEF definition is left here
                                        because some code still uses this
                                        field where the CCWMIDA bit is
                                        not applicable.
          .... ...1      CCWUNDEF       X'01' CCWUNDEF I/O UNDEFINED BIT
          .... ...1      CCWMIDA        X'01' CCWMIDA
                                        Modified-CCW-indirect-data-addres
                                        sing
0005    5 Bitstring    1 S0CCWUN        FORMAT 0 "UNUSED" byte.
0006    6 Signed       2 S0CCWCNT       Count for I/O
          00000008       S0CCWSLN       (*-S0CCW) Length of a FORMAT 0
                                        CCW if the SKIP bit is set. (No
                                        TIC)
0008    8 Signed       4 S0CCWWD2 (0)   Third word of CCW pair
0008    8 Bitstring    1 S0CCWTCC       TIC CCW command code
0009    9 Address      3 S0CCWTCA       TIC CCW address (24-BIT)
000C   12 Signed       2 S0CCWDAT (0)   Start of variable length data
          0000000C       S0CCWLEN       (*-S0CCW) Length of a FORMAT 0
                                        CCW pair in bytes
             S0CCWOL is a 2 byte field used to contain the
             original data length for CCWs which have had
             blanks compressed from the data.  This field is
             nonexistent for CCWs in which compression does not
             occur.
             The exception is TAG processing which always has
             the original data length appended to the end of
             the tag data field.
             S0CCWOL is located following the data.
             However, direct addressability cannot be achieved
             due to the preceding variable length data field.
000C   12 Bitstring    2 S0CCWOL        Value of the original data length
          00000010       S0CCWTAG       (((S0CCWLEN+L'S0CCWOL+7)/8)*8)
                                        Length to add to the tag for the
                                        CCW and the original data length.
                                        Doubleword alignment is
                                        guaranteed through this
                                        computation.
          00000007       S0CCWIS        B'0111' Insert mask for 24-bit
                                        addresses

S0CCW Storage Layout

          
*** S0CCW - SPOOLing Format 0 Channel Control
*
*     +------+--------------------+------+------+-------------+
*   0 |:CWCMD|     S0CCWADR       |:CWFLG|:CWUN |  S0CCWCNT   |
*     +------+--------------------+------+------+-------------+
*   8 |:CWTCC|     S0CCWTCA       |  S0CCWOL    | E
*     +------+--------------------+-------------+
*
*** S0CCW - SPOOLing Format 0 Channel Control

S0CCW Cross Reference

Symbol         Dspl Value
-------------- ---- -----
CCWCC          0004 40
CCWDC          0004 80
CCWIDA         0004 04
CCWINVAL       0004 03
CCWMIDA        0004 01
CCWPCIR        0004 08
CCWSILI        0004 20
CCWSKIP        0004 10
CCWSUSPN       0004 02
CCWUNDEF       0004 01
S0CCWADR       0001
S0CCWCMD       0000
S0CCWCNT       0006
S0CCWDAT       000C
S0CCWFLG       0004
S0CCWIS        000C 00000007
S0CCWLEN       000C 0000000C
S0CCWOL        000C
S0CCWPAR       0000
S0CCWSLN       0006 00000008
S0CCWTAG       000C 00000010
S0CCWTCA       0009
S0CCWTCC       0008
S0CCWUN        0005
S0CCWWD0       0000
S0CCWWD1       0004
S0CCWWD2       0008