DEARG | Back to Index page

| Prolog Control Block Contents DEARG 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.

DEARG Prolog | Top of page

     NAME       : HCPDEARG
     DESCRIPTION: Define Extent CCW argument mapping
     DSECT      : DEARG
     FUNCTION   : Map the argument of a Define Extent CCW
     LOCATED BY : None
     CREATED BY : None
     DELETED BY : None
     RELOCATION CONSIDERATIONS : None
     NOTES      : This is only for CKD/ECKD.
                  For FBA define extent mapping see HCPDFDA

DEARG Control Block Content | Top of page

     DEARG DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      DEARG          Define Extent CCW argument mapping
    0000    0 Bitstring   32 DEDATA (0)
    0000    0 Bitstring    1 DEMSKBTE       Mask byte
              11.. ....      DEALLWRT       X'C0' DEALLWRT Permit all write
                                            commands
              .1.. ....      DEINHWRT       X'40' DEINHWRT Inhibit all write
                                            operations
              1... ....      DEUPDWRT       X'80' DEUPDWRT Permit update
                                            write operations only
              .... ....      DESOMWRT       X'00' DESOMWRT Permit all write
                                            operations exept write H and
                                            write RO MASK BYTE BIT 2 is
                                            reserved, must be 0 MASK BYTE
                                            BITS 3-4
              .... ....      DEALLSK        X'00' DEALLSK Permit all seek and
                                            recalibrate commands
              .... 1...      DESKCHD        X'08' DESKCHD Permit Seek
                                            Cylinder and Seek Head only
              ...1 ....      DESKHED        X'10' DESKHED Permit Seek Head
                                            only
              ...1 1...      DEINHSK        X'18' DEINHSK Inhibit all seek
                                            commands & multitrack operations
                                            MASK BYTE BITS 5-6 If non-zero,
                                            control unit cache is bypassed.
              .... ....      DEAUTHNR       X'00' DEAUTHNR Normal
                                            authorization
              .... ..1.      DEAUTHDS       X'02' DEAUTHDS Can access all
                                            tracks, perform all Locate
                                            Records (device support
                                            authorization)
              .... .1..      DEAUTHDG       X'04' DEAUTHDG Diagnostic
                                            authorization
              .... ....      DEAUTHID       X'00' DEAUTHID Inhibit Data-Check
                                            Correction and retry and device
                                            support authorization MASK BYTE
                                            BIT 7
              .... ...1      DEPCIFTC       X'01' DEPCIFTC PCI Fetch mode
                                     MASK BYTE BITS 0-1
    0001    1 Bitstring    1 DEGLATTR       Global attributes
              11.. ....      DEGLECKD       X'C0' DEGLECKD ECKD Global
                                            attribute byte bit 2
              ..1. ....      DEGLCONV       X'20' DEGLCONV CKD conversion
                                            mode Global attribute byte bits
                                            3-5
              .... ....      DEGLCACH       X'00' DEGLCACH Use normal cache
                                            replacement
              .... .1..      DEGLNOCA       X'04' DEGLNOCA Bypass cache
              .... 1...      DEGLNCAL       X'08' DEGLNCAL Inhibit cache
                                            loading
              .... 11..      DEGLSEQA       X'0C' DEGLSEQA Sequential access
                                            Global attribute byte bit 6
              .... ..1.      DEGLCFWR       X'02' DEGLCFWR Use cache fast
                                            write Global attribute byte bit 7
                                            reserved
                                     Global attribute byte bits 0-1
    0002    2 Bitstring    2 DEBLKSZE       Block size
    0004    4 Bitstring    3 *              Reserved Bytes 4-6
    0007    7 Bitstring    1 DE7BYTE        Byte 7
    0008    8 Bitstring    2 DEBEGCYL       Beginning of cylinder extent
    000A   10 Bitstring    2 DEBEGHD        Beginning of head extent
    000C   12 Bitstring    2 DEENDCYL       End of cylinder extent
    000E   14 Bitstring    2 DEENDHD        End of head extent
              00000010       DENXRCL        *-DEARG XRC not supported data
                                            length
          Extension of data area for XRC time stamping support
                 Bytes 16 through 23 (I/O time stamp)
    0010   16 Bitstring    8 DETSTAMP       Time stamp
              00000018       DEXRCL         *-DEARG XRC supported data length
                 Bytes 24 through 31 (reserved)
    0018   24 Bitstring    8 DERSRVD        Reserved for hardware use
              00000020       DEARGLEN       *-DEARG DEFINE EXTENT data area
                                            length
              00000040       DEPFXLEN       64 PREFIX LENGTH

DEARG Storage Layout | Top of page

    *** DEARG - Define Extent CCW argument mapping
    *
    *     +------+------+-------------+--------------------+------+
    *   0 |:SKBTE|:LATTR|  DEBLKSZE   |////////////////////|:BYTE |
    *     +------+------+-------------+-------------+------+------+
    *   8 |  DEBEGCYL   |  DEBEGHD    |  DEENDCYL   |  DEENDHD    |
    *     +-------------+-------------+-------------+-------------+
    *  10 |                       DETSTAMP                        |
    *     +-------------------------------------------------------+
    *  18 |                       DERSRVD                         |
    *     +-------------------------------------------------------+
    *  20
    *
    *** DEARG - Define Extent CCW argument mapping

DEARG Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    DEALLSK        0000 00
    DEALLWRT       0000 C0
    DEARGLEN       0018 00000020
    DEAUTHDG       0000 04
    DEAUTHDS       0000 02
    DEAUTHID       0000 00
    DEAUTHNR       0000 00
    DEBEGCYL       0008
    DEBEGHD        000A
    DEBLKSZE       0002
    DEDATA         0000
    DEENDCYL       000C
    DEENDHD        000E
    DEGLATTR       0001
    DEGLCACH       0001 00
    DEGLCFWR       0001 02
    DEGLCONV       0001 20
    DEGLECKD       0001 C0
    DEGLNCAL       0001 08
    DEGLNOCA       0001 04
    DEGLSEQA       0001 0C
    DEINHSK        0000 18
    DEINHWRT       0000 40
    DEMSKBTE       0000
    DENXRCL        000E 00000010
    DEPCIFTC       0000 01
    DEPFXLEN       0018 00000040
    DERSRVD        0018
    DESKCHD        0000 08
    DESKHED        0000 10
    DESOMWRT       0000 00
    DETSTAMP       0010
    DEUPDWRT       0000 80
    DEXRCL         0010 00000018
    DE7BYTE        0007

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:27:39 EDT.
Copyright IBM Corporation, 1990, 2020