DCPU Back to Index page
 
Prolog 
Control Block Contents 
   DCPU DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  DCPU Prolog Top of page
  
 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.
 RELOCATION CONSIDERATIONS : None
 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 Top of page
  




 DCPU DSECT
Top of page


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' DCPUVECT ON if VECTOR
                                        specified.
          .1.. ....      DCPUNOVE       X'40' DCPUNOVE ON if NOVECTOR
                                        specified.
          ..1. ....      DCPUIDFL       X'20' DCPUIDFL ON if CPUID
                                        specified.
          ...1 ....      DCPUDED        X'10' DCPUDED ON if DEDICATE
                                        specified.
          .... 1...      DCPUNDED       X'08' DCPUNDED ON if NODEDICATE
                                        specified.
          .... .1..      DCPUCRYP       X'04' DCPUCRYP 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 Top of page
  
          
*** DCPU - Directory CPU Block
*
*     +---------------------------+-------------+-------------+
*   0 |         DCPUDASD          |  DCPUDISP   |  DCPUADDR   |
*     +--------------------+------+-------------+-------------+
*   8 |      DCPUID        |:UFLGS|///////////////////////////|
*     +--------------------+------+---------------------------+
*  10
*
*** DCPU - Directory CPU Block
 
 
  DCPU Cross Reference Top of page
  
 
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
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:48:50 EDT.
Copyright IBM Corporation, 1990, 2022