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

#### SGIOP

Prolog

Control Block Contents
SGIOP DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### SGIOP Prolog

     NAME       : HCPSGIOP
     DESCRIPTION: Synchronous General I/O Parameters
     DSECT      : SGIOP
     FUNCTION   : Describe the parameters of a Diagnose 'A8' request
     LOCATED BY : The "X" register contains the logical address of
                  the SGIOP in Guest storage at the time Diagnose 'A8'
                  is issued.
     CREATED BY : The program issuing Diagnose 'A8'.
     DELETED BY : N/A
     COMMENTS   : The SGIOP is fetched by CP from the VM's storage during
                  Diagnose 'A8' initialization.  An updated version may be
                  stored back in the virtual machine before the Diagnose
                  instruction processing completes.

#### SGIOP Control Block Content

#### SGIOP DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      SGIOP          Synchronous General I/O Parameters
    0000    0 Signed       2 SGIDEVNO       The virtual device number of the
                                            device to be used.
    0002    2 Bitstring    2 SGIOKF (0)     Key and Flag bytes.
    0002    2 Bitstring    1 SGIKEY         The Storage Protection Key to use
                                            for I/O operations with this
                                            request.
    0003    3 Bitstring    1 SGIFLG         ORB Word 1, Bits 8-15
              00000080       SGIFMT         X'80' SGIFMT F-CCW format. 0=F0,
                                            1=F1
              00000002       SGIDAWF2       X'02' SGIDAWF2 H-IDAW format
                                            0=F1, 1=F2
              00000001       SGIDAW2K       X'01' SGIDAW2K T-IDAW size 0=4K,
                                            1=2K
    0004    4 Signed       4 SGIRESV1       Reserved for future IBM use.
    0008    8 Address      4 SGICPA         Channel Program Address for this
                                            request.
    000C   12 Signed       4 SGIRESV2       Reserved for future IBM use.
    0010   16 Bitstring    8 SGICASC (0)    Combined CCW Address, Device &
                                            Subchannel status and Residual
                                            count fields.
    0010   16 Address      4 SGICCWA        Address of CCW at Interrupt (+8).
    0014   20 Bitstring    1 SGIDEVST       The Device Status byte, returned
                                            by CP.
    0015   21 Bitstring    1 SGISCHST       The Subchannel Status byte,
                                            returned by CP
    0016   22 Signed       2 SGIRESCT       The Residual Count, returned by
                                            CP.
    0018   24 Bitstring    1 SGILPM         Path down which i/o is to be done
    0019   25 Bitstring    1 SGIOPTS        SGI options
              1... ....      SGIEAV         X'80' SGIEAV ccccCCCh Cylinder
                                            Addressing SGIEAV must be set to
                                            enable access to cylinders at or
                                            above 65520. This applies to 3390
                                            Extended Address Volumes.
    001A   26 Bitstring    2 SGIRESV3       Reserved for future IBM use.
    001C   28 Signed       2 SGIRESV4       Reserved for future IBM use.
    001E   30 Signed       2 SGISNSCT       The amount of sense data present.
    0020   32 Signed       4 SGIRESV5       Reserved for future IBM use.
    0024   36 Signed       4 SGIRESV6       Reserved for future IBM use.
    0028   40 Signed       4 SGIRESV7       Reserved for future IBM use.
    002C   44 Signed       4 SGIRESV8       Reserved for future IBM use.
    0030   48 Signed       4 SGIRESV9       Reserved for future IBM use.
    0034   52 Signed       4 SGIRESVA       Reserved for future IBM use.
    0038   56 Bitstring   32 SGISDATA       The sense data (only if unit
                                            check is on in SGIDEVST).
              00000058       SGIBYLEN       *-SGIOP Length (in bytes) of
                                            SGIOP.
              0000000B       SGIDWSIZ       ((SGIBYLEN+7)/8) Size of SGIOP in
                                            Doublewords.
    0008    8 Bitstring    3 *
    000B   11 Bitstring    1 SGICPA3        Right-most byte for alignment
                                            test

#### SGIOP Storage Layout

    *** SGIOP - Synchronous General I/O Parameters
    *
    *     +-------------+------+------+---------------------------+
    *   0 |  SGIDEVNO   |SGIKEY|SGIFLG|         SGIRESV1          |
    *     +-------------+------+------+---------------------------+
    *   8 |          SGICPA           |         SGIRESV2          |
    *     +---------------------------+------+------+-------------+
    *  10 |         SGICCWA           |:DEVST|:SCHST|  SGIRESCT   |
    *     +------+------+-------------+------+------+-------------+
    *  18 |SGILPM|:OPTS |  SGIRESV3   |  SGIRESV4   |  SGISNSCT   |
    *     +------+------+-------------+-------------+-------------+
    *  20 |         SGIRESV5          |         SGIRESV6          |
    *     +---------------------------+---------------------------+
    *  28 |         SGIRESV7          |         SGIRESV8          |
    *     +---------------------------+---------------------------+
    *  30 |         SGIRESV9          |         SGIRESVA          |
    *     +---------------------------+---------------------------+
    *  38 |                                                       |
    *     =                       SGISDATA                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    *  58
    *
    *** SGIOP - Synchronous General I/O Parameters

    *** Overlay for SGICPA in SGIOP
    *
    *     +--------------------+------+
    *   8 |////////////////////|:CPA3 | C
    *     +--------------------+------+
    *
    *** Overlay for SGICPA in SGIOP

#### SGIOP Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    SGIBYLEN       0038 00000058
    SGICASC        0010
    SGICCWA        0010
    SGICPA         0008
    SGICPA3        000B
    SGIDAWF2       0003 00000002
    SGIDAW2K       0003 00000001
    SGIDEVNO       0000
    SGIDEVST       0014
    SGIDWSIZ       0038 0000000B
    SGIEAV         0019 80
    SGIFLG         0003
    SGIFMT         0003 00000080
    SGIKEY         0002
    SGILPM         0018
    SGIOKF         0002
    SGIOPTS        0019
    SGIRESCT       0016
    SGIRESVA       0034
    SGIRESV1       0004
    SGIRESV2       000C
    SGIRESV3       001A
    SGIRESV4       001C
    SGIRESV5       0020
    SGIRESV6       0024
    SGIRESV7       0028
    SGIRESV8       002C
    SGIRESV9       0030
    SGISCHST       0015
    SGISDATA       0038
    SGISNSCT       001E

This information is based on z/VM V6R1.0. Last updated on 18 Feb 2010 at 09:04:22 EDT.
Copyright IBM Corporation, 1990, 2008