Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

#### PURBK

Prolog

Control Block Contents
PURBK DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### PURBK Prolog

     Name       : HCPPURBK
     Description: Minidisk Cache Purge block
     DSECT      : PURBK
     Function   : Provide information needed for virtual
                  interrupt processing to purge specific
                  minidisk cache data.
     Located by : Linked list hanging from IORPURGE.IORBK
     Created by : HCPMD3
     Deleted by : HCPVIT

#### PURBK Control Block Content

#### PURBK DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      PURBK          Minidisk Cache Purge block
    0000    0 Address      4 PURNEXT        Pointer to next PURBK
    0004    4 Address      4 PURRDEV        Pointer to RDEV block
    0008    8 Signed       4 PURSEXT        Start extent to purge
    000C   12 Signed       4 PUREEXT        End extent to purge
    0010   16 Signed       2 PURHSID        Hash Id
    0012   18 Signed       2 PURTPCY        Tracks per cylinder
    0014   20 Bitstring   36 *              Reserved
              00000038       PURBYLN        *-PURBK Byte length of PURBK
              00000007       PURDWSZ        ((PURBYLN+7)/8) Doubleword length
                                            of PURBK

#### PURBK Storage Layout

    *** PURBK - Minidisk Cache Purge block
    *
    *     +---------------------------+---------------------------+
    *   0 |         PURNEXT           |         PURRDEV           |
    *     +---------------------------+---------------------------+
    *   8 |         PURSEXT           |         PUREEXT           |
    *     +-------------+-------------+---------------------------+
    *  10 |  PURHSID    |  PURTPCY    |///////////////////////////|
    *     +-------------+-------------+///////////////////////////|
    *  18 |///////////////////////////////////////////////////////|
    *     =///////////////////////////////////////////////////////=
    *     |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    *  38
    *
    *** PURBK - Minidisk Cache Purge block

#### PURBK Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    PURBYLN        0014 00000038
    PURDWSZ        0014 00000007
    PUREEXT        000C
    PURHSID        0010
    PURNEXT        0000
    PURRDEV        0004
    PURSEXT        0008
    PURTPCY        0012

This information is based on z/VM V5R2.0. Last updated on 12 Apr 2006 at 17:18:49 EDT.
Copyright IBM Corporation, 1990, 2005