CARBK | Back to Index page

| Prolog Control Block Contents CARBK 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.

CARBK Prolog | Top of page

     NAME       : HCPCARBK
     DESCRIPTION: ISFC CP Application Request/Response
                  parameter list
     DSECT      : CARBK
     FUNCTION   : Pass information between a CP application and the
                  ISFC CP application mailbox.
     LOCATED BY : For outbound requests, HCPAAKIQ Queue anchor.
                  For requests waiting for an OPEN to complete, TRGPNDOQ.
     CREATED BY : A CP application wishing to communicate with the
                  CP mailbox or by the CP mailbox when
                  information is to be delivered to a CP application.
     DELETED BY : ISFC CP application mailbox.
     SERIALIZED : None
     RELOCATION CONSIDERATIONS : None
     NOTES      :
                  The CARBK parameter list holds the information related
                  to a specific CP application mailbox function.
                  It may contain a pointer to a string of PGEBKs that
                  represent pages of data to be transmitted.
                  The ACTIVATION function returns to the application
                  the size of a reserved area at the begin of each
                  data page. The actual data is stored below the
                  reserved area.
                  NOTES      : The size of the reserved area on the first
                  data page is larger than the reserved area
                  on subsequent data pages.
       +---------------+
       | CARBK         |
       |               |
       |               |    +------------+
       | A(PGEBK.1) ------->| PGEBK.1    |
       |               |    |  Virt.Addr |
       |               |    |  Real.Addr ------------------>
       |               |    |  A(PGEBK.n)|---               |
       +---------------+    +------------+  |               V
                                            |  +---------------------+
                                            |  | reserved area       |
                                            |  |- - - - - - - - - - -|
                                            |  | Data contained in   |
                                            |  | this page frame...  |
                                            |  |                     |
                                            |  +---------------------+
                                            |
                                            V
                                      +------------+
                                      | PGEBK.n    |
                                      |  Virt.Addr |
                                      |  Real.Addr |
                                      +------------+

CARBK Control Block Content | Top of page

     CARBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      CARBK          ISFC CP Application Request/Response
    0000    0 Character    8 CARAPPLT       Target CP application
    0008    8 Character    8 CARNODET       Target node name
    0010   16 Character    8 CARAPPLS       Source CP application
    0018   24 Character    8 CARNODES       Source node name
    0020   32 Signed       2 *              Reserved (path id)
    0022   34 Bitstring    1 CARFUNC        Function request code
              00000001       CAROPEN        1 CAROPEN - Open path function
              00000002       CARTRMIT       2 CARTRMIT - Transmit request
              00000003       CARDEACT       3 CARDEACT - Deactivate request
              00000004       CARCLOSE       4 CARCLOSE - Close request
              00000005       CARFRTRG       5 CARFRTRG - Release TRGBK
                                            request
    0023   35 Bitstring    1 CARFLAGS       Flag byte:
    0024   36 Address      4 CARNEXT        Pointer to next CARBK on queue
    0028   40 Signed       4 CARAHND        Handle for obtaining ACTBK
                                            address
    002C   44 Address      4 CARACTBK       ACTBK address
    0030   48 Address      4 CARTRGBK       TRGBK address
    0034   52 Address      4 CARPGECH       PGEBK chain
    0038   56 Dbl-Word     8 * (2)          Reserved
              00000009       CARSIZE        (*-CARBK+7)/8 Size, in
                                            doublewords, of CARBK

CARBK Storage Layout | Top of page

    *** CARBK - ISFC CP Application Request/Response
    *
    *     +-------------------------------------------------------+
    *   0 |                       CARAPPLT                        |
    *     +-------------------------------------------------------+
    *   8 |                       CARNODET                        |
    *     +-------------------------------------------------------+
    *  10 |                       CARAPPLS                        |
    *     +-------------------------------------------------------+
    *  18 |                       CARNODES                        |
    *     +-------------+------+------+---------------------------+
    *  20 |/////////////|:FUNC |:FLAGS|         CARNEXT           |
    *     +-------------+------+------+---------------------------+
    *  28 |         CARAHND           |         CARACTBK          |
    *     +---------------------------+---------------------------+
    *  30 |         CARTRGBK          |         CARPGECH          |
    *     +---------------------------+---------------------------+
    *  38 |///////////////////////////////////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    *  48
    *
    *** CARBK - ISFC CP Application Request/Response

CARBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    CARACTBK       002C
    CARAHND        0028
    CARAPPLS       0010
    CARAPPLT       0000
    CARCLOSE       0022 00000004
    CARDEACT       0022 00000003
    CARFLAGS       0023
    CARFRTRG       0022 00000005
    CARFUNC        0022
    CARNEXT        0024
    CARNODES       0018
    CARNODET       0008
    CAROPEN        0022 00000001
    CARPGECH       0034
    CARSIZE        0038 00000009
    CARTRGBK       0030
    CARTRMIT       0022 00000002

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:29:06 EDT.
Copyright IBM Corporation, 1990, 2020