PSST | Back to Index page

| Prolog Control Block Contents PSST 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.

PSST Prolog | Top of page

     NAME       : HCPPSST
     DESCRIPTION: PTE Serialization Status Tracking block
     DSECT      : PSST
     FUNCTION   : A PTE Serialization Status Tracking block
                  describes the PTE serialization that a task
                  believes it currently holds on a specific
                  PTE. It is not the actual PTE serialization
                  state, but rather a record used by a routine
                  to keep track of what it currently holds.
     LOCATED BY : N/A.
     CREATED BY : N/A.
                  This is not a control block that is allocated, but
                  rather a DSECT typically used to redefine a portion
                  of a savearea.
     DELETED BY : N/A.
     RELOCATION CONSIDERATIONS : None
     NOTES      : The HCPPGSER, HCPTPGSR, and HCPPTERD macros provide
                  a TRACKING parameter which is used with this DSECT.
                  HCPPGSER and HCPPTERD assist in maintaining the state
                  of the PSST DSECT while HCPTPGSR will verify that the
                  TRACKING value is consistent file the actual PTE
                  serialization state reflected in the PGSTE.

PSST Control Block Content | Top of page

     PSST DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      PSST           PTE Serialization Status Tracking block
          PSSFLAGS provides additional information related to the
          PTE serialization state in the PSSPGSER byte.
          PSSRESERVED must never be on because of dependencies in
          the HCPPGSER and HCPTPGSR macros.
    0000    0 Bitstring    1 PSSFLAGS       Flag bits related to PSSPGSER.
              1... ....      PSSRESERVED    X'80' PSSRESERVED Reserved - must
                                            never be on.
              .... ...1      PSSREDRIVE     X'01' PSSREDRIVE Task is
                                            committed to redrive.
          PSSPGSER is a code that represents the PTE Serialization
          state that the task currently holds. It is a record of
          what the task believes it holds, not the actual PTE
          Serialization state which is in the PGSTE. The value
          corresponds to a single PTE serialization state unlike
          the PGSTE which may need to reflect that both PCLONLY
          and SOFTLONG are held by different tasks.
    0001    1 Bitstring    1 PSSPGSER       PTE Serialization task holds.
              00000000       PSSNONE        X'00' PSSNONE No PTE
                                            serialization is held.
              00000080       PSSPCLONLY     PSSPCL PSSPCLONLY X'80'
              000000C0       PSSSHORT       PSSPCL+PSSPCL2 PSSSHORT X'C0'
              000000E0       PSSHARDLONG    PSSPCL+PSSPCL2+PSSLTSER
                                            PSSHARDLONG X'E0'
              00000060       PSSSOFTLONG    PSSPCL2+PSSLTSER PSSSOFTLONG
                                            X'60'
              000000C1       PSSERRSHORT    PSSPCL+PSSPCL2+PSSERROR
                                            PSSERRSHORT X'C1'
              1... ....      PSSPCL         PGSPCL PSSPCL X'80'
          The following equates shouldn't be used directly. They
          define the individual bits that the PTE serialization states
          are composed of.
              00000040       PSSPCL2        PGSPCL2 X'40'
              00000020       PSSLTSER       PGSLTSER X'20'
              00000001       PSSERROR       PGSERROR X'01'
          END OF DEFINITION

PSST Storage Layout | Top of page

    *** PSST - PTE Serialization Status Tracking block
    *
    *     +------+------+
    *   0 |:FLAGS|:PGSER| 2
    *     +------+------+
    *
    *** PSST - PTE Serialization Status Tracking block

PSST Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    PSSERROR       0001 00000001
    PSSERRSHORT    0001 000000C1
    PSSFLAGS       0000
    PSSHARDLONG    0001 000000E0
    PSSLTSER       0001 00000020
    PSSNONE        0001 00000000
    PSSPCL         0001 80
    PSSPCLONLY     0001 00000080
    PSSPCL2        0001 00000040
    PSSPGSER       0001
    PSSREDRIVE     0000 01
    PSSRESERVED    0000 80
    PSSSHORT       0001 000000C0
    PSSSOFTLONG    0001 00000060

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:29:48 EDT.
Copyright IBM Corporation, 1990, 2020