MLDBK

Prolog  

Control Block Contents  
   MLDBK DSECT
   MLDENTRY DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

MLDBK Prolog

 NAME       : HCPMLDBK
 DESCRIPTION: Mapping List Definition Block.
 DSECT      : MLDBK
 FUNCTION   : The MLDBK is used to pass parameter for
              diagnose X'244'.
 LOCATED BY : MPLMLDBK - contains the address of this block.
 CREATED BY : Created in the guest virtual machine's storage and
              copied to VMDVOBUF for CP to use.
 DELETED BY : Deleted by the guest virtual machine.
 SERIALIZED : Guest Virtual Machine is responsible.
 RELOCATION CONSIDERATIONS : None
 COMMENTS   : NONE

MLDBK Control Block Content

MLDBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      MLDBK          Mapping List Definition Block.
0000    0 Signed       4 MLDALET        ALET specifying the ad- dress
                                        space in which the next MLDBK
                                        resides.
0004    4 Signed       4 MLDFWDPT       Forward pointer to next MLDBK.
0008    8 Signed       4 MLDENTCT       Count of entries contained in
                                        this block.
000C   12 Signed       4 *              Reserved for IBM use.
0010   16 Signed       4 MLDENTR1 (0)   First entry in variable list.
                                        This is a pool-
                                        relative-block-number
             The following are used to determine the size of the
      header for this control block.                            .
          00000010       MLDLEN         *-MLDBK Length of this control
                                        block in bytes.
          00000002       MLDSIZE        (MLDLEN+7)/8 Size of this control
                                        block in doublewords.
             The following DSECT fields are for the variable data.

MLDENTRY DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      MLDENTRY       Mapping List Definition Block.
0000    0 Signed       4 MLDPRBN        An entry that is a pool-
                                        relative-block number.
          00000004       MLDETLEN       *-MLDENTRY Length of the 1st
                                        entry.
0004    4 Signed       4 MLDNXTET (0)   Next extent in list.
          00000400       MLDNMETP       4096/MLDETLEN The number of
                                        entries contained in a page.
                                        ****************-------
          00001000       MLDSZETP       MLDETLEN*MLDNMETP Total storage
                                        size of all entries that can fit
                                        into a page.

MLDBK Storage Layout

          
*** MLDBK - Mapping List Definition Block.
*
*     +---------------------------+---------------------------+
*   0 |         MLDALET           |         MLDFWDPT          |
*     +---------------------------+---------------------------+
*   8 |         MLDENTCT          |///////////////////////////|
*     +---------------------------+---------------------------+
*
*** MLDBK - Mapping List Definition Block.
          
*** MLDENTRY - Mapping List Definition Block.
*
*     +---------------------------+
*   0 |         MLDPRBN           |
*     +---------------------------+
*
*** MLDENTRY - Mapping List Definition Block.

MLDBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
MLDALET        0000
MLDENTCT       0008
MLDENTR1       0010
MLDETLEN       0000 00000004
MLDFWDPT       0004
MLDLEN         0010 00000010
MLDNMETP       0004 00000400
MLDNXTET       0004
MLDPRBN        0000
MLDSIZE        0010 00000002
MLDSZETP       0004 00001000