NAME       : HCPXDRBK
 DESCRIPTION: Expanded Storage Directory Block
 DSECT      : XDRBK
 FUNCTION   : This block maintains the state of all increments
              of expanded storage installed on the system.
 LOCATED BY : The pointer to the collection of XDRBKs known
              as the "directory" is located in field
              XSTDIRAN of the Expanded Storage Management
              Data Block (XSTMG).
 CREATED BY : HCPESCDI during initialization processing.
 DELETED BY : HCPESCDI if no expanded storage is configured
              to the system.
 RELOCATION CONSIDERATIONS : None

 XDRBK DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      XDRBK          Expanded Storage Directory Block
0000    0 Dbl-Word     8 XDRINCDR (4)   Increment Directory Entry
0000    0 Dbl-Word     8 XDRENTRY (0)   Increment Directory Entry
0000    0 Signed       4 XDRAEMAP       Address of allocation and error
                                        maps (XSUBK) for this increment.
0004    4 Signed       4 XDRINDX        Increment index.
0008    8 Dbl-Word     8 XDRCURNT       Current status of allocation.
0010   16 Signed       4 XDRINALC       Count of blocks available in the
                                        increment
0014   20 Signed       4 XDRINERC       Count of blocks in error in the
                                        increment.
0018   24 Signed       4 XDRFLAGS       Flags and locks for the entry
001C   28 Signed       4 *              Reserved for IBM use
0008    8 Signed       4 XDRINCRS       Increment cursor which points to
                                        the next available block to
                                        attempt to allocate within this
                                        increment.
000C   12 Signed       4 XDRSCLEN       Length of allocation map left to
                                        scan. It is the number of bytes
                                        between XDRINCRS and the end of
                                        the allocation map.
0010   16 Signed       4 XDRVMDBK       Address of the base VMDBK which
                                        owns this increment of xstore.
                                        This base VMDBK is the base for
                                        the primary configuration for
                                        this user. It is equivalent to
                                        VMDORIG. This field is valid if
                                        XDRSTAT is in the Guest and not
                                        Migrating state.
0018   24 Signed       2 XDRLOCK        Lock area for this increment
001A   26 Bitstring    1 XDRSTAT        Increment status flag byte
          1... ....      XDRCONFG       X'80' XDRCONFG Increment is
                                        configured to this hardware
                                        partition.
          .1.. ....      XDRSTDBY       X'40' XDRSTDBY Increment is in
                                        standby mode
          ..1. ....      XDRRESVD       X'20' XDRRESVD Increment is in
                                        reserved mode
          .... 1...      XDRONLIN       X'08' XDRONLIN Increment is
                                        logically online and usable. When
                                        this bit is on, the XSUBK address
                                        in XDRAEMAP can be used. When
                                        this bit is off, all the blocks
                                        associated with this XDRBK are in
                                        error despite the contents of the
                                        allocation and error maps.
          .... ..1.      XDRCP          X'02' XDRCP Increment belongs to
                                        CP. When off the increment
                                        belongs to a guest.
          .... ...1      XDRINCMD       X'01' XDRINCMD Increment state
                                        modifier. When on: If XDRCP is on
                                        then increment is in the
                                        CP-Retained state. If XDRCP is
                                        off then increment is in the
                                        Guest-Migrating state.
001B   27 Bitstring    1 *              Reserved for IBM use
0018   24 Bitstring    1 XDRINCLK       This is the lock byte for the
                                        increment. The lock must be
                                        obtained to scan for a block
                                        within the increment.
0019   25 Bitstring    1 XDROWNER       This is the lock owner identifier
                                        field.
          000000E3       XDRATTCH       X'E3' XDRATTCH Attach owns the
                                        lock
          000000D9       XDREPAIR       X'D9' XDREPAIR Usability map
                                        repair owns lock
          000000D8       XDRQUERY       X'D8' XDRQUERY Query XSTORE owns
                                        the lock
          000000D5       XDRETAIN       X'D5' XDRETAIN Retain XSTORE owns
                                        the lock
          000000D4       XDRMCH         X'D4' XDRMCH Machine Check
                                        Handler owns lock
          000000C5       XDRDETCH       X'C5' XDRDETCH Detach owns the
                                        lock
          000000C4       XDRDEALC       X'C4' XDRDEALC Deallocation owns
                                        the lock
          00000000       XDRALLOC       X'00' XDRALLOC If XDRINCLK is
                                        set, allocation owns the lock. If
                                        XDRINCLK is not set then no
                                        owner.
          00000020       XDRLENTH       *-XDRBK Length of each XDRBK in
                                        bytes
          00000004       XDRSIZE        (*-XDRBK+7)/8 Length of each
                                        XDRBK in dwords

          
*** XDRBK - Expanded Storage Directory Block
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       XDRINCDR                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  20
*
*** XDRBK - Expanded Storage Directory Block
          
*** Overlay for XDRINCDR in XDRBK
*
*     +---------------------------+---------------------------+
*   0 |         XDRAEMAP          |         XDRINDX           |
*     +---------------------------+---------------------------+
*   8 |                       XDRCURNT                        |
*     +---------------------------+---------------------------+
*  10 |         XDRINALC          |         XDRINERC          |
*     +---------------------------+---------------------------+
*  18 |         XDRFLAGS          |///////////////////////////|
*     +---------------------------+---------------------------+
*  20
*
*** Overlay for XDRINCDR in XDRBK
          
*** Overlay for XDRCURNT in XDRBK
*
*     +---------------------------+---------------------------+
*   8 |         XDRINCRS          |         XDRSCLEN          |
*     +---------------------------+---------------------------+
*  10
*
*** Overlay for XDRCURNT in XDRBK
          
*** Overlay for XDRINALC in XDRBK
*
*     +---------------------------+
*  10 |         XDRVMDBK          | 14
*     +---------------------------+
*
*** Overlay for XDRINALC in XDRBK
          
*** Overlay for XDRFLAGS in XDRBK
*
*     +-------------+------+------+
*  18 |  XDRLOCK    |:STAT |//////| 1C
*     +-------------+------+------+
*
*** Overlay for XDRFLAGS in XDRBK
          
*** Overlay for XDRLOCK in XDRBK
*
*     +------+------+
*  18 |:INCLK|:OWNER| 1A
*     +------+------+
*
*** Overlay for XDRLOCK in XDRBK

 
Symbol         Dspl Value
-------------- ---- -----
XDRAEMAP       0000
XDRALLOC       0019 00000000
XDRATTCH       0019 000000E3
XDRCONFG       001A 80
XDRCP          001A 02
XDRCURNT       0008
XDRDEALC       0019 000000C4
XDRDETCH       0019 000000C5
XDRENTRY       0000
XDREPAIR       0019 000000D9
XDRETAIN       0019 000000D5
XDRFLAGS       0018
XDRINALC       0010
XDRINCDR       0000
XDRINCLK       0018
XDRINCMD       001A 01
XDRINCRS       0008
XDRINDX        0004
XDRINERC       0014
XDRLENTH       0019 00000020
XDRLOCK        0018
XDRMCH         0019 000000D4
XDRONLIN       001A 08
XDROWNER       0019
XDRQUERY       0019 000000D8
XDRRESVD       001A 20
XDRSCLEN       000C
XDRSIZE        0019 00000004
XDRSTAT        001A
XDRSTDBY       001A 40
XDRVMDBK       0010