FIOBK | Back to Index page

| Prolog Control Block Contents FIOBK 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.

FIOBK Prolog | Top of page

     NAME       : HCPFIOBK
     DESCRIPTION: FORMATTED I/O BLOCK
     DSECT      : FIOBK
     FUNCTION   : DEFINE DASD I/O REQUEST TO STAND-ALONE DASD I/O ROUTINE
                  WITH A DESCRIPTION OF THE AREA ON THE VOLUME THAT IS TO
                  USED.  THE DATA CAN BE ACCESSED BY using either a
                  relative block number or an ASA.
     LOCATED BY : GENERAL PURPOSE REGISTER 1 ON ENTRY TO HCPLODAS
     CREATED BY : HCPCKPRS - BEFORE SYSTEM INITIALIZATION ON A SYSTEM BOUNCE
                  HCPCKPSH - DURING AN ABNORMAL TERMINATION OR SHUTDOWN
                  HCPLODNC - DURING THE SYSTEM LOAD PROCESS
     DELETED BY : FIOBK IS OBVIATED WHEN SYSTEM BECOMES FUNCTIONAL
     RELOCATION CONSIDERATIONS : None

FIOBK Control Block Content | Top of page

     FIOBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      FIOBK          FORMATTED I/O BLOCK
         -                           INITIALIZATION AND TERMINATION
    0000    0 Bitstring    1 FIOCCWOP       CCW OP-CODE, CWODRDTA OR CWODWDTA
    0001    1 Bitstring    1 FIOFLAG        I/O CONDITION FLAG (CC=1)
              1... ....      FIOSTRFL       X'80' FIOSTRFL I/O STORAGE
                                            FAILURE, CANNOT LOAD BLOCK
              .1.. ....      FIOFAIL        X'40' FIOFAIL I/O FAILURE AFTER
                                            10 ATTEMPTS
              ..1. ....      FIODEVIC       X'20' FIODEVIC I/0 DEVICE DOES
                                            NOT RESPOND
              ...1 ....      FIORANGE       X'10' FIORANGE I/O OUTSIDE OF
                                            RANGE OF CYLINDERS OR PAGES
              .... ....      FIOSUCES       X'00' FIOSUCES CC=0 I/O WAS
                                            SUCCESSFUL
    0002    2 Bitstring    1 FIOWRPFL       HCPWRP requesting altnuc I/O
                                            flags
              1... ....      FIOIPLRC       X'80' FIOIPLRC Read IPL rec from
                                            vol in FIOASA
              .1.. ....      FIOLODMD       X'40' FIOLODMD Read HCPLOD from
                                            Volume in FIOASA
    0003    3 Bitstring    1 *              Reserved for future IBM use
    0004    4 Signed       4 FIOAREAS       Starting cylinder(CKD/ECKD) or
                                            page(FBA) number of the area on
                                            the volume where I/O can be done
    0008    8 Signed       4 FIOAREAL       Length in cylinders/pages of the
                                            area on the volume where I/O can
                                            done
    000C   12 Signed       2 FIOPCYLS       PAGES PER CYLINDER ON THIS DEVICE
    000E   14 Signed       2 FIOPTRKS       PAGES PER TRACK ON THIS DEVICE
    0010   16 Address      8 FIOPAGAD       Host Absolute address of page to
                                            be read or written.
    0018   24 Signed       4 FIOSUBCH       SUBCHANNEL NUMBER OF UNIT
    001C   28 Signed       4 FIOASA         Spooling ASA(CKD-CCPV, FBA-PPPV)
    0020   32 Signed       4 FIOBLKNO       BLOCK NUMBER WITH 'FILE'
    0024   36 Signed       2 FIOLEN         LENGTH OF RECORD TO BE READ OR
                                            WRITTEN
    0026   38 Signed       2 *              RESERVED FOR FUTURE IBM USE
    0028   40 Signed       4 FIORDEV        Address of RDEV block
              00000006       FIOSIZE        (*-FIOBK+7)/8 LENGTH OF FORMATTED
                                            I/O BLOCK

FIOBK Storage Layout | Top of page

    *** FIOBK - FORMATTED I/O BLOCK
    *
    *     +------+------+------+------+---------------------------+
    *   0 |:CCWOP|:FLAG |:WRPFL|//////|         FIOAREAS          |
    *     +------+------+------+------+-------------+-------------+
    *   8 |         FIOAREAL          |  FIOPCYLS   |  FIOPTRKS   |
    *     +---------------------------+-------------+-------------+
    *  10 |                       FIOPAGAD                        |
    *     +---------------------------+---------------------------+
    *  18 |         FIOSUBCH          |          FIOASA           |
    *     +---------------------------+-------------+-------------+
    *  20 |         FIOBLKNO          |   FIOLEN    |/////////////|
    *     +---------------------------+-------------+-------------+
    *  28 |         FIORDEV           | 2C
    *     +---------------------------+
    *
    *** FIOBK - FORMATTED I/O BLOCK

FIOBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    FIOAREAL       0008
    FIOAREAS       0004
    FIOASA         001C
    FIOBLKNO       0020
    FIOCCWOP       0000
    FIODEVIC       0001 20
    FIOFAIL        0001 40
    FIOFLAG        0001
    FIOIPLRC       0002 80
    FIOLEN         0024
    FIOLODMD       0002 40
    FIOPAGAD       0010
    FIOPCYLS       000C
    FIOPTRKS       000E
    FIORANGE       0001 10
    FIORDEV        0028
    FIOSIZE        0028 00000006
    FIOSTRFL       0001 80
    FIOSUBCH       0018
    FIOSUCES       0001 00
    FIOWRPFL       0002

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:28:13 EDT.
Copyright IBM Corporation, 1990, 2020