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.
 RELOCATION CONSIDERATIONS : None

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' HSAIDAL HSAVECA points to
                                        an array of pages (indirect list
                                        of page frames)
          .1.. ....      HSALSUMM       X'40' HSALSUMM Local Summary Bit
                                        for a list notification vector
          ..1. ....      HSALIMIT       X'20' HSALIMIT CP limited the
                                        vector size
0029   41 Bitstring    1 HSATYPE        Type of Token
          00000000       HSAUNKN        X'00' HSAUNKN Unknown token type
          00000001       HSALCT         X'01' HSALCT Local Cache Token
                                        (LCT)
          00000002       HSALNT         X'02' HSALNT 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
          00000040       HSAPAGE2       64 Maximum number of pages CP
                                        will allow to be allocated for a
                                        larger 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
          00200000       HSAMBIT2       (HSAPAGE2*HSABP) Maximum number
                                        of bits mapped by this control
                                        block for larger vector
                                        (2,097,152)

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
HSAMBIT2       0038 00200000
HSANUMPG       0024
HSAPAGES       0038 00000010
HSAPAGE2       0038 00000040
HSAPGSHF       0038 0000000F
HSASMALL       0038 00007F00
HSATOKEN       0020
HSATYPE        0029
HSAUNKN        0029 00000000
HSAVECA        002C
HSAVMDBK       0018