DEFDSECT | Back to Index page

| Prolog Control Block Contents DEFDSECT 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.

DEFDSECT Control Block Content | Top of page

     DEFDSECT DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      DEFDSECT       ,
    0000    0 Bitstring   16 EXTAREA (0)
    0000    0 Bitstring    1 EXTMASK        MASK BYTE **------
              00000000       EXTWNORM       B'00000000' ALLOW NORMAL WRITES
              00000040       EXTWNONE       B'01000000' INHIBIT ALL WRITES
              00000080       EXTWUPD        B'10000000' UPDATE WRITES ONLY
              000000C0       EXTWALL        B'11000000' ALLOW ALL WRITES
                                            ---**---
              00000000       EXTPSALL       B'00000000' PERMIT ALL SEEKS &
                                            RECAL
              00000008       EXTPSCH        B'00001000' PERMIT SEEK CYL &
                                            HEAD
              00000010       EXTPSH         B'00010000' PERMIT SEEK HEAD
              00000018       EXTISEEK       B'00011000' INHIBIT ALL SEEKS
                                            -----**-
              00000000       EXTDINON       B'00000000' NORMAL OPERATIONS
              00000002       EXTDIDSA       B'00000010' DEVICE SUPPORT
                                            AUTHORIZATION CHAN
              00000004       EXTDIAG        B'00000100' DIAGNOSTIC
                                            AUTHORIZATION
              00000006       EXTDIINH       B'00000110' DSA WITH INHIBIT DATA
                                            CORRECTION -------
              00000001       EXTPCI         B'00000001' PCI FETCH MODE
    0001    1 Bitstring    1 EXTGLOBL       GLOBAL ATTRIBUTES
              .... ....      EXTFBA         B'00000000' EXTFBA FB-512 MODE
              11.. ....      EXTECKD        B'11000000' EXTECKD ECKD MODE
                                            ---***-- CACHE CONTROLS
              .... ....      EXTCNCR        B'00000000' EXTCNCR NORMAL CACHE
                                            REPLACMENT
              .... .1..      EXTCBYP        B'00000100' EXTCBYP BYASS CACHE
              .... 1...      EXTCICL        B'00001000' EXTCICL INHIBIT CACHE
                                            LOADING
              .... 11..      EXTCSA         B'00001100' EXTCSA SEQUENTIAL
                                            ACCESS
              ...1 ....      EXTCSP         B'00010000' EXTCSP SEQUENTIAL
                                            PRESTAGE
              ...1 .1..      EXTCRA         B'00010100' EXTCRA RECORD ACCESS
                                            ------*- CACHE CONTROLS
              .... ..1.      EXTCCFWD       B'00000010' EXTCCFWD CACHE FAST
                                            WRITE DATA
              .... ...1      EXTCIDFW       B'00000001' EXTCIDFW INHIBIT DASD
                                            FAST WRITE
    0002    2 Signed       2 EXTSIZE        AVERAGE BLOCK SIZE
    0004    4 Signed       2 EXTCFWID       CACHE FAST WRITE DATA
                                            IDENTIFICATION
    0006    6 Bitstring    1 EXTGLOBA       GLOBAL ATTRIBUTES ADDITIONAL
    0007    7 Bitstring    1 EXTGLOBE       GLOBAL ATTRIBUTES EXTENDED
    0008    8 Bitstring    4 EXTBCCCH (0)   BEGINNING 28-BIT ADDRESS
    0008    8 Signed       2 EXTBEGCC       BEGINNING CYLINDER
    000A   10 Signed       2 EXTBEGHH       BEGINNING HEAD
    000C   12 Bitstring    4 EXTECCCH (0)   END 28-BIT ADDRESS
    000C   12 Signed       2 EXTENDCC       END CYLINDER
    000E   14 Signed       2 EXTENDHH       END HEAD
                 ECKD LOCATE RECORD DEFINITION
              .1.. .111      CCWLR          X'47' LOCATE RECORD

DEFDSECT Storage Layout | Top of page

    *** DEFDSECT - Control Block in DEFDSECT
    *
    *     +------+------+-------------+-------------+------+------+
    *   0 |:MASK |:GLOBL|  EXTSIZE    |  EXTCFWID   |:GLOBA|:GLOBE|
    *     +------+------+-------------+-------------+------+------+
    *   8 |  EXTBEGCC   |  EXTBEGHH   |  EXTENDCC   |  EXTENDHH   |
    *     +-------------+-------------+-------------+-------------+
    *  10
    *
    *** DEFDSECT - Control Block in DEFDSECT

DEFDSECT Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    CCWLR          000E 47
    EXTAREA        0000
    EXTBCCCH       0008
    EXTBEGCC       0008
    EXTBEGHH       000A
    EXTCBYP        0001 04
    EXTCCFWD       0001 02
    EXTCFWID       0004
    EXTCICL        0001 08
    EXTCIDFW       0001 01
    EXTCNCR        0001 00
    EXTCRA         0001 14
    EXTCSA         0001 0C
    EXTCSP         0001 10
    EXTDIAG        0000 00000004
    EXTDIDSA       0000 00000002
    EXTDIINH       0000 00000006
    EXTDINON       0000 00000000
    EXTECCCH       000C
    EXTECKD        0001 C0
    EXTENDCC       000C
    EXTENDHH       000E
    EXTFBA         0001 00
    EXTGLOBA       0006
    EXTGLOBE       0007
    EXTGLOBL       0001
    EXTISEEK       0000 00000018
    EXTMASK        0000
    EXTPCI         0000 00000001
    EXTPSALL       0000 00000000
    EXTPSCH        0000 00000008
    EXTPSH         0000 00000010
    EXTSIZE        0002
    EXTWALL        0000 000000C0
    EXTWNONE       0000 00000040
    EXTWNORM       0000 00000000
    EXTWUPD        0000 00000080

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:32:28 EDT.
Copyright IBM Corporation, 1990, 2020