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

#### HSABK

Prolog

Control Block Contents
HSABK DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### HSABK Prolog

     NAME       : HCPHSABK
     DESCRIPTION: Hardware System Storage Control Block
     DSECT      : HSABK
     FUNCTION   : An internal CP control block used to map discontigious
                  free storage used to simulate the Hardware System Area
                  Storage (HSA) within CP.
     CREATED BY : Dynamically created by HCPGETST when a
                  cache or list vector is defined via the
                  simulation of a DEFINE VECTOR (DV B268
                  OPCODE) Instruction.
     DELETED BY : Deleted by HCPRELST during the simulation
                  of a "Release Vector Function" of a DEFINE
                  VECTOR (DV B268) Instruction or a virtual
                  system reset.

#### HSABK Control Block Content

#### HSABK DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      HSABK          Hardware System Storage Control
                                            Block
    0000    0 Dbl-Word     8 HSALOCK (3)    Vector Bit Lock
    0018   24 Address      4 HSAVMDBK       VMDBK of the vector owner
    001C   28 Signed       4 HSABITS        Number of HSA bits mapped by this
                                            this block
    0020   32 Signed       4 HSATOKEN       Word 2 of the token assigned to
                                            this vector
    0024   36 Signed       4 HSANUMPG       Number of page frames allocated
                                            and pointed to via the page array
                                            anchored off HSAVECA
    0028   40 Bitstring    1 HSAFLAG        HSABK Processing Flag
              1... ....      HSAIDAL        X'80' HSAVECA points to an array
                                            of pages (indirect list of page
                                            frames)
              .1.. ....      HSALSUMM       X'40' Local Summary Bit for a
                                            list notification vector
              ..1. ....      HSALIMIT       X'20' CP limited the vector size
    0029   41 Bitstring    1 HSATYPE        Type of Token
              00000000       HSAUNKN        X'00' Unknown token type
              00000001       HSALCT         X'01' Local Cache Token (LCT)
              00000002       HSALNT         X'02' List Notification Token
                                            (LNT)
    002A   42 Bitstring    1 * (2)          Reserved for future IBM use
    002C   44 Address      4 HSAVECA        Address of a single vector or an
                                            array of vector addresses.
                                            HSAFLAG.HSAIDAL determines what
                                            this field contains
    0030   48 Dbl-Word     8 *              Reserved for future IBM use
    0038   56 Bitstring    1 HSA$END (0)    The end
          Notes      : The following assembler equates are defined and can be
                used but do not appear in the control block expansion
                because they are in the PLX section and PRINT OFF,
                NOGEN are in effect.
              00000010       HSAPAGES       16 Maximum number of pages CP
                                            will allow to allocated for a
                                            single vector
              00008000       HSABP          32768 Maximum number of bits per
                                            page
              0000000F       HSAPGSHF       15 Number of bits to shift right
                                            to determine the page number of a
                                            vector bit
              00007F00       HSASMALL       (HSABP-256) Maximum number of
                                            bits in a small vector
              00080000       HSAMBITS       (HSAPAGES*HSABP) Maximum number
                                            of bits that can be mapped by
                                            this control block

#### HSABK Storage Layout

    *** HSABK - Hardware System Storage Control Block
    *
    *     +-------------------------------------------------------+
    *   0 |                                                       |
    *     =                       HSALOCK                         =
    *     |                                                       |
    *     +---------------------------+---------------------------+
    *  18 |         HSAVMDBK          |         HSABITS           |
    *     +---------------------------+---------------------------+
    *  20 |         HSATOKEN          |         HSANUMPG          |
    *     +------+------+-------------+---------------------------+
    *  28 |:FLAG |:TYPE |/////////////|         HSAVECA           |
    *     +------+------+-------------+---------------------------+
    *  30 |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    *
    *** HSABK - Hardware System Storage Control Block

#### HSABK Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    HSA$END        0038
    HSABITS        001C
    HSABP          0038 00008000
    HSAFLAG        0028
    HSAIDAL        0028 80
    HSALCT         0029 00000001
    HSALIMIT       0028 20
    HSALNT         0029 00000002
    HSALOCK        0000
    HSALSUMM       0028 40
    HSAMBITS       0038 00080000
    HSANUMPG       0024
    HSAPAGES       0038 00000010
    HSAPGSHF       0038 0000000F
    HSASMALL       0038 00007F00
    HSATOKEN       0020
    HSATYPE        0029
    HSAUNKN        0029 00000000
    HSAVECA        002C
    HSAVMDBK       0018

This information is based on z/VM V5R2.0. Last updated on 12 Apr 2006 at 16:58:31 EDT.
Copyright IBM Corporation, 1990, 2005