DCPU

Prolog  

Control Block Contents  
   DCPU DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

DCPU Prolog

 NAME       : HCPDCPU
 DESCRIPTION: Directory CPU Block
 DSECT      : DCPU
 FUNCTION   : The DCPU block contains information derived from one
              Directory CPU statement.
 LOCATED BY : DVMDCDAS (Directory DASD address)
              DVMDCDSP (Offset within a page)
 CREATED BY : HCPDIR, HCPUDS
 DELETED BY : HCPLGN
 SERIALIZED : HCPDIR executes in the guest's virtual machine,
              therefore, MP serialization does not apply there.
              HCPUDS operates under the directory lock.
 NOTES      : The size of this block must ALWAYS be a doubleword multiple.
              Entry point HCPUDSCP fills a buffer with these blocks.
              In order for the caller of this entry point to use the DCPU
              DSECT correctly, the blocks must be DW aligned. The logic
              in HCPUDSCP and for the caller is simplified when this
              constraint is followed.

DCPU Control Block Content

DCPU DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DCPU           Directory CPU Block
0000    0 Signed       4 DCPUDASD       DASD address of the next DCPU
                                        CCPV for CKD DASD addresses PPPV
                                        for FBA DASD addresses
0004    4 Signed       2 DCPUDISP       offset to the next DCPU
0006    6 Signed       2 DCPUADDR       CPU address. Valid range is 0-3F.
0008    8 Bitstring    3 DCPUID         CPU ID. Becomes bits 8-31 of the
                                        response to the STIPD
                                        instruction.
000B   11 Bitstring    1 DCPUFLGS       CPU definition flags.
          1... ....      DCPUVECT       X'80' ON if VECTOR specified.
          .1.. ....      DCPUNOVE       X'40' ON if NOVECTOR specified.
          ..1. ....      DCPUIDFL       X'20' ON if CPUID specified.
          ...1 ....      DCPUDED        X'10' ON if DEDICATE specified.
          .... 1...      DCPUNDED       X'08' ON if NODEDICATE specified.
          .... .1..      DCPUCRYP       X'04' ON if CRYPTO specified.
000C   12 Signed       4 *              Reserved for future IBM use.
          00000002       DCPUSIZE       (*-DCPU+7)/8 DCPU block size in
                                        DW's.
          00000010       DCPULEN        (*-DCPU) DCPU block size in
                                        bytes.

DCPU Storage Layout

          
*** DCPU - Directory CPU Block
*
*     +---------------------------+-------------+-------------+
*   0 |         DCPUDASD          |  DCPUDISP   |  DCPUADDR   |
*     +--------------------+------+-------------+-------------+
*   8 |      DCPUID        |:UFLGS|///////////////////////////|
*     +--------------------+------+---------------------------+
*  10
*
*** DCPU - Directory CPU Block

DCPU Cross Reference

Symbol         Dspl Value
-------------- ---- -----
DCPUADDR       0006
DCPUCRYP       000B 04
DCPUDASD       0000
DCPUDED        000B 10
DCPUDISP       0004
DCPUFLGS       000B
DCPUID         0008
DCPUIDFL       000B 20
DCPULEN        000C 00000010
DCPUNDED       000B 08
DCPUNOVE       000B 40
DCPUSIZE       000C 00000002
DCPUVECT       000B 80