CNNBK | Back to Index page

| Prolog Control Block Contents CNNBK 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.

CNNBK Prolog | Top of page

     NAME       : HCPCNNBK
     DESCRIPTION: Connectivity (aka ISFC) address space
                  specific control block
     DSECT      : CNNBK
     FUNCTION   : Contains information used in managing
                  (allocation and re-organization of) a
                  Connectivity address space.
     LOCATED BY : ASCTYPTR field of ASCBK points to a CAABK.  This
                  control block starts at CAAFSI (function specific
                  information) section of the CAABK.
     CREATED BY : HCPASMCR, when creating a Connectivity address space
     DELETED BY : Once created, never deleted.
     SERIALIZED :
     RELOCATION CONSIDERATIONS : None

CNNBK Control Block Content | Top of page

     CNNBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      CNNBK          Connectivity (aka ISFC) address space
    0000    0 Bitstring    1 CNNINDEX       Index of the i-ASIT table entry
                                            that describes address space
    0001    1 Bitstring    1 * (3)          Reserved for IBM use
    0004    4 Signed       4 * (3)          Reserved for IBM use
              00000002       CNNSIZE        (*-CNNBK+7)/8 Size, in
                                            doublewords, of CNNBK

CNNBK Storage Layout | Top of page

    *** CNNBK - Connectivity (aka ISFC) address space
    *
    *     +------+--------------------+---------------------------+
    *   0 |:INDEX|////////////////////|///////////////////////////|
    *     +------+--------------------+///////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    *  10
    *
    *** CNNBK - Connectivity (aka ISFC) address space

CNNBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    CNNINDEX       0000
    CNNSIZE        0004 00000002

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:27:21 EDT.
Copyright IBM Corporation, 1990, 2020