GCCW Back to Index page
 
Prolog 
Control Block Contents 
   GCCW DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  GCCW Prolog Top of page
  
 NAME       : HCPGCCW
 DESCRIPTION: GUEST CHANNEL CONTROL WORD MAPPING
 DSECT      : GCCW
 FUNCTION   : PROVIDE SYMOLIC REFERENCES FOR THE FIELDS OF A CCW
              FOR A VIRTUAL MACHINE
 LOCATED BY : N/A
 CREATED BY : N/A
 DELETED BY : N/A
 RELOCATION CONSIDERATIONS : None
 
 
  GCCW Control Block Content Top of page
  




 GCCW DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      GCCW           GUEST CHANNEL CONTROL WORD MAPPING
0000    0 Dbl-Word     8 GCCWDWRD       CCW STRUCTURE
0000    0 Signed       4 GCCW0WD0 (0)   FIRST WORD OF CCW
0000    0 Bitstring    1 GCCW0CMD       CCW COMMAND CODE
0001    1 Address      3 GCCW0ADR       CCW ADDRESS (24-BIT)
0004    4 Signed       4 GCCW0WD1 (0)   SECOND WORD OF CCW
0004    4 Bitstring    1 GCCW0FLG       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 GCCW0SPL       FORMAT 0 "UNUSED" BYTE.
0006    6 Signed       2 GCCW0CNT       COUNT FOR I/O
0008    8 Dbl-Word     8 GCCW0NXT (0)   NEXT GUEST CCW
          00000007       GCCW0IS        B'0111' INSERT MASK
          00000080       GCCW0IDL       B'10000000' IDAL INVALID BITS
                                        MASK
          00000008       GCCW0LEN       8 LENGTH OF A FORMAT 0 CCW
0000    0 Signed       4 GCCW1WD0 (0)   FIRST WORD OF CCW
0000    0 Bitstring    1 GCCW1CMD       CCW COMMAND CODE
0001    1 Bitstring    1 GCCW1FLG       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
0002    2 Signed       2 GCCW1CNT       COUNT FOR I/O
0004    4 Signed       4 GCCW1WD1 (0)   SECOND WORD OF CCW
0004    4 Address      4 GCCW1ADR       CCW ADDRESS (31-BIT)
0008    8 Dbl-Word     8 GCCW1NXT (0)   NEXT GUEST CCW
          0000000F       GCCW1IS        B'1111' INSERT MASK
          00000080       GCCW1IDL       B'10000000' IDAL INVALID BIT MASK
          00000008       GCCW1LEN       8 LENGTH OF A FORMAT 1 CCW
 
 
  GCCW Storage Layout Top of page
  
          
*** GCCW - GUEST CHANNEL CONTROL WORD MAPPING
*
*     +-------------------------------------------------------+
*   0 |                       GCCWDWRD                        |
*     +-------------------------------------------------------+
*   8
*
*** GCCW - GUEST CHANNEL CONTROL WORD MAPPING
          
*** Overlay for GCCWDWRD in GCCW
*
*     +------+--------------------+------+------+-------------+
*   0 |:W0CMD|     GCCW0ADR       |:W0FLG|:W0SPL|  GCCW0CNT   |
*     +------+--------------------+------+------+-------------+
*
*** Overlay for GCCWDWRD in GCCW
          
*** Overlay for GCCWDWRD in GCCW
*
*     +------+------+-------------+---------------------------+
*   0 |:W1CMD|:W1FLG|  GCCW1CNT   |         GCCW1ADR          |
*     +------+------+-------------+---------------------------+
*
*** Overlay for GCCWDWRD in GCCW
 
 
  GCCW Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
CCWCC          0004 40
CCWCC          0001 40
CCWDC          0004 80
CCWDC          0001 80
CCWIDA         0004 04
CCWIDA         0001 04
CCWINVAL       0004 03
CCWINVAL       0001 03
CCWMIDA        0004 01
CCWMIDA        0001 01
CCWPCIR        0004 08
CCWPCIR        0001 08
CCWSILI        0004 20
CCWSILI        0001 20
CCWSKIP        0004 10
CCWSKIP        0001 10
CCWSUSPN       0004 02
CCWSUSPN       0001 02
CCWUNDEF       0004 01
CCWUNDEF       0001 01
GCCWDWRD       0000
GCCW0ADR       0001
GCCW0CMD       0000
GCCW0CNT       0006
GCCW0FLG       0004
GCCW0IDL       0008 00000080
GCCW0IS        0008 00000007
GCCW0LEN       0008 00000008
GCCW0NXT       0008
GCCW0SPL       0005
GCCW0WD0       0000
GCCW0WD1       0004
GCCW1ADR       0004
GCCW1CMD       0000
GCCW1CNT       0002
GCCW1FLG       0001
GCCW1IDL       0008 00000080
GCCW1IS        0008 0000000F
GCCW1LEN       0008 00000008
GCCW1NXT       0008
GCCW1WD0       0000
GCCW1WD1       0004
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:50:56 EDT.
Copyright IBM Corporation, 1990, 2022