Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

#### PGM64

Prolog

Control Block Contents
PGM64 DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### PGM64 Control Block Content

#### PGM64 DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      PGM64          Page Management Block
    0000    0 Bitstring    1 PGM64PG0 (4096)
                                            First page of ESAME PGMBK
    0000    0 Dbl-Word     8 PGMGMISC (256) Miscallaneous ESAME mode PGMBK
                                            fields. Contains fields global to
                                            the entire PGMBK and/or the
                                            entire megabyte of virtual
                                            storage.
    0800 2048 Dbl-Word     8 PGMGPGTB (256) Page-Table - contains 256 8 byte
                                            Page-Table Entries. Each entry is
                                            used to describe 4K of virtual
                                            storage. The complete 256 entry
                                            table describes 1 Megabyte of
                                            host virtual storage (whether
                                            guest or system owned). The
                                            architected definition of a
                                            Page-Table entry is contained in
                                            the HCPPAGTE COPY file.
              00000008       PGMGPTEL       8 Length of an ESAME mode Page-
                                            Table Entry (in bytes)
              00000808       PGMGPTBP1      PGMGPGTB+PGMGPTEL Offset of the
                                            2nd entry in the PAGTB, used for
                                            an MVC to copy the first entry
                                            thru the rest of the first eighth
                                            of the PAGTB
              00000900       PGMGPTBP2      PGMGPGTB+PGMGPTEL*32 2nd eighth
                                            of the PAGTB
              00000A00       PGMGPTBP3      PGMGPGTB+PGMGPTEL*64 3rd eighth
                                            of the PAGTB
              00000B00       PGMGPTBP4      PGMGPGTB+PGMGPTEL*96 4th eighth
                                            of the PAGTB
              00000C00       PGMGPTBP5      PGMGPGTB+PGMGPTEL*128 5th eighth
                                            of the PAGTB
              00000D00       PGMGPTBP6      PGMGPGTB+PGMGPTEL*160 6th eighth
                                            of the PAGTB
              00000E00       PGMGPTBP7      PGMGPGTB+PGMGPTEL*192 7th eighth
                                            of the PAGTB
              00000F00       PGMGPTBP8      PGMGPGTB+PGMGPTEL*224 8th eighth
                                            of the PAGTB
    1000 4096 Bitstring    1 PGM64PG1 (4096)
                                            Second page of ESAME PGMBK
    1000 4096 Dbl-Word     8 PGMGPSTB (256) Page Status Table. 256 entries, 8
                                            bytes per entry. Each entry
                                            describes the status of one 4K
                                            page of host virtual storage. The
                                            definition of a Page Status Table
                                            entry is contained in the
                                            HCPPGSTE COPY file.
              00001000       PGMGPSTO       PGMGPSTB-PGM64 Offset of ESAME
                                            PGSTB in PGMBK
              00000008       PGMGPSTL       8 Length of an ESAME mode page
                                            status table entry (in bytes)
              00001008       PGMGPSTP1      PGMGPSTB+PGMGPSTL Offset of the
                                            2nd entry in the PGSTB, used for
                                            an MVC to copy the first entry
                                            thru the rest of the first eighth
                                            of the PGSTB
              00001100       PGMGPSTP2      PGMGPSTB+PGMGPSTL*32 2nd eighth
                                            of the PGSTB
              00001200       PGMGPSTP3      PGMGPSTB+PGMGPSTL*64 3rd eighth
                                            of the PGSTB
              00001300       PGMGPSTP4      PGMGPSTB+PGMGPSTL*96 4th eighth
                                            of the PGSTB
              00001400       PGMGPSTP5      PGMGPSTB+PGMGPSTL*128 5th eighth
                                            of the PGSTB
              00001500       PGMGPSTP6      PGMGPSTB+PGMGPSTL*160 6th eighth
                                            of the PGSTB
              00001600       PGMGPSTP7      PGMGPSTB+PGMGPSTL*192 7th eighth
                                            of the PGSTB
              00001700       PGMGPSTP8      PGMGPSTB+PGMGPSTL*224 8th eighth
                                            of the PGSTB
    1800 6144 Dbl-Word     8 PGMGASAT (256) Auxiliary Storage Address Table.
                                            256 entries, 8 bytes per entry.
                                            ENTRY. EACH ENTRY IS THE LOCATION
                                            ON AUXILIARY STORAGE WHERE THE
                                            VIRTUAL STORAGE IS BACKED UP. THE
                                            DEFINITION OF ONE ENTRY IS
                                            CONTAINED IN THE HCPASATE COPY
                                            FILE.
              00000008       PGMGASAL       8 Length of an ESAME mode ASA
                                            table entry (in bytes)
              00001800       PGMGASAO       PGMGASAT-PGM64 Offset of ESAME
                                            ASATB in PGMBK
              00001000       PGMGPABS       *-PGMGPSTB Size of PGSTB and
                                            ASATB in bytes
              00002000       PGMGBKLN       (*-PGM64) Size of ESAME PGMBK in
                                            bytes
              00000400       PGMGBKSZ       (*-PGM64+7)/8 Size of ESAME PGMBK
                                            in DWs
    0000    0 Signed       4 PGMGVM         VMDBK address of PGMBK owner (or
                                            SNTBK address for an NSS shared
                                            segment)
    0004    4 Signed       4 *              Reserved for IBM use
    0008    8 Dbl-Word     8 PGMGVIRT       Virtual address of storage
                                            described by this block
    0010   16 Signed       4 PGMGMIGP       Count of pages currently being
                                            migrated from xstore to DASD
    0014   20 Address      4 PGMGDEFA       Deferred page translations queue
                                            anchor (points to CPEBK or 0)
    0018   24 Signed       4 PGMGBKLK       PGMBK multiple PTE serialization
                                            lock. This lock must be held when
                                            obtaining or releasing page
                                            serialization for multiple PTEs
                                            to prevent deadlocks. It also
                                            serializes the PGMBK page
                                            serialization deferral queue
                                            based at PGMGDEFA. It contains 0
                                            when the lock is available, or
                                            the address of the CS loop that
                                            obtained the lock in the routine
                                            that currently holds the lock.
         Note that PGMGBKLK does NOT serialize the PGMBK itself in any way. The
         high order halfword of the PGMGFRMC field is used (via the HCPLKPGM and
         HCPULPGM macros) to lock the PGMBK itself into storage.
    001C   28 Signed       4 PGMGSNTU       Count of users sharing this NSS
                                            shared segment megabyte
    0020   32 Bitstring    1 PGMGSTAT       Status indicators
              1... ....      PGMGSVSE       X'80' PGMBK REPRESENTS STORAGE
                                            FOR A SAVED SEGMENT
              .1.. ....      PGMGIGRT       X'40' PGMBK WAS PAGED IN DURING
                                            XSTORE MIGRATION
    0021   33 Bitstring    1 *              Reserved for IBM use
    0022   34 Signed       2 PGMGEPOC       Epoch for this PGMBK. The time
                                            stamps in this PGMBK have been
                                            adjusted to this epoch.
    0024   36 Signed       4 PGMGXSTC       Count of PTEs with pages in
                                            xstore
    0028   40 Dbl-Word     8 * (0)
    0028   40 Signed       4 *              Reserved for IBM use
    002C   44 Signed       4 PGMGALTP       Pointer to the alternate PGMBK
                                            which contains the source
                                            alternate PTEs for any target
                                            alternate PTEs (with PGSALTPT
                                            set) in this PGMBK.
    0030   48 Dbl-Word     8 * (0)
    0030   48 Signed       4 *              Reserved for IBM use
    0034   52 Signed       4 PGMGASCB       ASCBK address
    0038   56 Signed       4 PGMGFRMC       Frames in use count in low-order
                                            halfword and PGMBK lock count in
                                            high-order halfword. Update
                                            counts using Compare and Swap
                                            logic.
    003C   60 Signed       4 *              Reserved for IBM use.
    0040   64 Dbl-Word     8 * (0)
    0040   64 Signed       4 *              Reserved for IBM use
    0044   68 Signed       4 PGMGMPEB       Address of the Minidisk Pool
                                            Extent block for converting a
                                            PRBN ASA into CCHHR.
         The following two fields are serialized by the available list
         replenishment demand scan lock, and are used to sort outbound FRMTEs
         for NSS/DCSS shared segment pages by segment (virtual address
         megabyte). They are not used for other types of pages (normal user page
         FRMTEs and VDISK FRMTEs are sorted by address space, but not megabyte,
         other non-blocked page FRMTEs are not sorted at all).
    0048   72 Dbl-Word     8 * (0)
    0048   72 Signed       4 *              Reserved for IBM use
    004C   76 Address      4 PGMGNPGM       Address of the next PGMBK in the
                                            steal sort PGMBK list. Contains
                                            x'00000000' if the PGMBK is not
                                            yet on the list, x'FFFFFFFF' if
                                            the PGMBK is last on the list.
                                            Used only when processing
                                            NSS/DCSS shared segment FRMTEs.
    0050   80 Dbl-Word     8 * (0)
    0050   80 Signed       4 *              Reserved for IBM use
    0054   84 Address      4 PGMGLFRM       Points to the last FRMTE so far
                                            chained (sorted) for this PGMBK.
                                            Used only when processing
                                            NSS/DCSS shared segment FRMTEs.
    0058   88 Dbl-Word     8 * (0)
    0058   88 Signed       4 *              Reserved for IBM use
    005C   92 Signed       4 PGMGP4EX       Virtual Free Storage Manager
                                            virtual address of saved copy of
                                            the original PGSTB/ASATB for this
                                            megabyte - only used in NSS/DCSS
                                            saved segment STLBK PGMBKs for
                                            megabytes which contain shared
                                            writeable pages. The saved ASATEs
                                            point to the original spool
                                            slots, so that original shared
                                            writeable page contents can be
                                            provided for non-shared loads.
                                            Must be zero in normal user
                                            PGMBKs or STLBK PGMBKs which do
                                            not contain any shared writeable
                                            pages.
    0060   96 Signed       8 PGMGITOD       TOD clock value at which the
                                            SEGTE for this pageable PGMBK was
                                            invalidated.
    0068  104 Signed       4 PGMGMTAR       Migrate target last used against
                                            this PGMBK
    006C  108 Signed       4 *              Reserved for IBM use.
    0070  112 Dbl-Word     8 * (0)
    0070  112 Signed       4 *              Reserved for IBM use
    0074  116 Signed       4 PGMGSEGT       Address of the STE associated
                                            with this PGMBK (valid only for
                                            "live" PGMBKs associated with
                                            attached STEs; may be zero
                                            otherwise). In pageable PGMBKs,
                                            is only reliable if the PGMBK is
                                            resident and attached to the STE
                                            and at least a share of VMDPTIL
                                            is held or if serialization
                                            (VMDPTIL and/or PTRM PTE PCL) has
                                            been held continuously since the
                                            STE was invalidated (to keep the
                                            segment table from being moved).
                                            Must be set to the current STE
                                            address whenever the STE is
                                            validated, and must be relocated
                                            for any valid STEs and/or valid
                                            PTRM PTEs whenever a segment
                                            table is moved.
    0078  120 Signed       4 *              Reserved for IBM use.
    007C  124 Signed       4 PGMGPPTE       Address of PTRM PTE when PGMBK is
                                            connected to a PTRM space.
    0080  128 Dbl-Word     8 * (240)        Reserved for IBM use.
              00000800       PGMMSCLN       (*-PGMGVM) Size of common area in
                                            bytes
         The following CKMAINT macro invocation ensures that the length of the
         ESAME format PGMBK common area is exactly 2048 bytes in length. CKMAINT
         will cause an assembly error if the length equate, PGMMSCLN, is not
         exactly equal to 2048.
         The following CKMAINT macro invocation ensures that the length of the
         ESAME format PGMBK is exactly 8192 bytes (two contiguous 4K pages).
         CKMAINT will cause an assembly error if the ESAME PGMBK length equate,
         PGMGBKLN, is not exactly equal to 8192.

#### PGM64 Storage Layout

    *** PGM64 - Page Management Block
    *
    *     +-------------------------------------------------------+
    *   0 |                                                       |
    *     =                       PGM64PG0                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    *1000
    *
    *** PGM64 - Page Management Block

    *** Overlay for PGM64PG0 in PGM64
    *
    *     +-------------------------------------------------------+
    *   0 |                                                       |
    *     =                       PGMGMISC                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    * 800 |                                                       |
    *     =                       PGMGPGTB                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    *1000 |                                                       |
    *     =                       PGM64PG1                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    *2000
    *
    *** Overlay for PGM64PG0 in PGM64

    *** Overlay for PGM64PG1 in PGM64
    *
    *     +-------------------------------------------------------+
    *1000 |                                                       |
    *     =                       PGMGPSTB                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    *1800 |                                                       |
    *     =                       PGMGASAT                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    *2000
    *
    *** Overlay for PGM64PG1 in PGM64

    *** Overlay for PGMGMISC in PGM64
    *
    *     +---------------------------+---------------------------+
    *   0 |          PGMGVM           |///////////////////////////|
    *     +---------------------------+---------------------------+
    *   8 |                       PGMGVIRT                        |
    *     +---------------------------+---------------------------+
    *  10 |         PGMGMIGP          |         PGMGDEFA          |
    *     +---------------------------+---------------------------+
    *  18 |         PGMGBKLK          |         PGMGSNTU          |
    *     +------+------+-------------+---------------------------+
    *  20 |:GSTAT|//////|  PGMGEPOC   |         PGMGXSTC          |
    *     +------+------+-------------+---------------------------+
    *  28 |///////////////////////////|         PGMGALTP          |
    *     +---------------------------+---------------------------+
    *  30 |///////////////////////////|         PGMGASCB          |
    *     +---------------------------+---------------------------+
    *  38 |         PGMGFRMC          |///////////////////////////|
    *     +---------------------------+---------------------------+
    *  40 |///////////////////////////|         PGMGMPEB          |
    *     +---------------------------+---------------------------+
    *  48 |///////////////////////////|         PGMGNPGM          |
    *     +---------------------------+---------------------------+
    *  50 |///////////////////////////|         PGMGLFRM          |
    *     +---------------------------+---------------------------+
    *  58 |///////////////////////////|         PGMGP4EX          |
    *     +---------------------------+---------------------------+
    *  60 |                       PGMGITOD                        |
    *     +---------------------------+---------------------------+
    *  68 |         PGMGMTAR          |///////////////////////////|
    *     +---------------------------+---------------------------+
    *  70 |///////////////////////////|         PGMGSEGT          |
    *     +---------------------------+---------------------------+
    *  78 |///////////////////////////|         PGMGPPTE          |
    *     +---------------------------+---------------------------+
    *  80 |///////////////////////////////////////////////////////|
    *     =///////////////////////////////////////////////////////=
    *     |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    * 800
    *
    *** Overlay for PGMGMISC in PGM64

#### PGM64 Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    PGMGALTP       002C
    PGMGASAL       1800 00000008
    PGMGASAO       1800 00001800
    PGMGASAT       1800
    PGMGASCB       0034
    PGMGBKLK       0018
    PGMGBKLN       1800 00002000
    PGMGBKSZ       1800 00000400
    PGMGDEFA       0014
    PGMGEPOC       0022
    PGMGFRMC       0038
    PGMGIGRT       0020 40
    PGMGITOD       0060
    PGMGLFRM       0054
    PGMGMIGP       0010
    PGMGMISC       0000
    PGMGMPEB       0044
    PGMGMTAR       0068
    PGMGNPGM       004C
    PGMGPABS       1800 00001000
    PGMGPGTB       0800
    PGMGPPTE       007C
    PGMGPSTB       1000
    PGMGPSTL       1000 00000008
    PGMGPSTO       1000 00001000
    PGMGPSTP1      1000 00001008
    PGMGPSTP2      1000 00001100
    PGMGPSTP3      1000 00001200
    PGMGPSTP4      1000 00001300
    PGMGPSTP5      1000 00001400
    PGMGPSTP6      1000 00001500
    PGMGPSTP7      1000 00001600
    PGMGPSTP8      1000 00001700
    PGMGPTBP1      0800 00000808
    PGMGPTBP2      0800 00000900
    PGMGPTBP3      0800 00000A00
    PGMGPTBP4      0800 00000B00
    PGMGPTBP5      0800 00000C00
    PGMGPTBP6      0800 00000D00
    PGMGPTBP7      0800 00000E00
    PGMGPTBP8      0800 00000F00
    PGMGPTEL       0800 00000008
    PGMGP4EX       005C
    PGMGSEGT       0074
    PGMGSNTU       001C
    PGMGSTAT       0020
    PGMGSVSE       0020 80
    PGMGVIRT       0008
    PGMGVM         0000
    PGMGXSTC       0024
    PGMMSCLN       0080 00000800
    PGM64PG0       0000
    PGM64PG1       1000

This information is based on z/VM V4R3.0. Last updated on 1 May 2002 at 09:41:46 EDT.
Copyright IBM Corporation, 1990, 2002