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

#### PAG64

Prolog

Control Block Contents
PAG64 DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### PAG64 Control Block Content

#### PAG64 DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      PAG64          Page Table Entry
    0000    0 Dbl-Word     8 PAGGENTR       PTEs are 8 bytes in ESAME
         PAGGPTOM = X'FFFFFFFFFFFFF800' represents the mask that could be used
         to isolate Page Table Origin (PTO) given the address of a PTE. 64-bit
         mask X'FFFFFFFFFFFFF800'
              00FFFFFF       PAGGPTMH       X'FFFFFFFF' Isolate high half of
                                            PTOM
              00FFF800       PAGGPTML       X'FFFFF800' Isolate low half of
                                            PTOM
         PAGGPFRA = X'FFFFFFFFFFFFF000' represents the mask that could be used
         to isolate the Page Frame Real Address from the address of a known PTE.
         NOTE that an instance of this constant exists at PFXGPFRA. 64-bit mask
         X'FFFFFFFFFFFFF000'
              00FFFFFF       PAGGPFAH       X'FFFFFFFF' Isolate high half of
                                            PFRA
              00FFF000       PAGGPFAL       X'FFFFF000' Isolate low half of
                                            PFRA
         64-bit mask X'0000000000000400' 32-bit high X'00000000' High half of
         mask
              00000400       PAGGINVR       X'00000400' Isolate I bit
         64-bit mask X'0000000000000200' 32-bit high X'00000000' High half of
         mask
              00000200       PAGGPROR       X'00000200' Isolate P bit
         64-bit mask X'0000000000000001' 32-bit high X'00000000' High half of
         mask
              .... ...1      PAGGLOKR       X'00000001' Isolate L bit
         64-bit mask X'00000000000000FE' 32-bit high X'00000000' High half of
         mask
              1111 111.      PAGGRSDR       X'000000FE' Reserved for IBM use
         64-bit mask X'0000000000000900' 32-bit high X'00000000' High half of
         mask
              00000900       PAGGRSVR       X'00000900' Reserved bits, must
                                            be 0 in any valid ESAME PTE
         The following equates may only be used when the PTE is invalid (the PTE
         I bit is set, meaning the page is not valid in host real storage):
         64-bit mask X'0000000000000500' 32-bit high X'00000000' High half of
         mask
              00000500       PAGGXIVR       X'00000500' Isolate I bit *AND*
                                            'valid in XSTORE' bits. This is a
                                            non-architected . software
                                            definition.
         64-bit mask X'FFFFFFFF00000000'
              00FFFFFF       PAGGXBNH       X'FFFFFFFF' Isolate XSBN
              .... ....      PAGGXBNL       X'00000000' Low half of mask This
                                            is a non-architected . software
                                            definition.
              00000000       PAGGXBNBL      0 Number of bits to the left of
                                            the XSBN. Can be used for
                                            shifting.
              00000020       PAGGXBNBR      32 Number of bits to the right of
                                            the XSBN. Can be used for
                                            shifting.
         64-bit mask X'0000000000000004' 32-bit high X'00000000' High half of
         mask
              .... .1..      PAGGXSRR       X'00000004' Isolate Xstore R bit
                                            (Reference bit) This is a
                                            non-architected . software
                                            definition.
         64-bit mask X'0000000000000001' 32-bit high X'00000000' High half of
         mask
              .... ...1      PAGGXSLR       X'00000001' Isolate L bit (Lock
                                            bit). This is architected for
                                            LKPG when PTE is valid. It is
                                            used by software when PTE is
                                            invalid.
    0000    0 Signed       4 PAG64W0 (0)    ESAME PTE Word 0
    0000    0 Signed       4 PAGGPFRL       Bits 0-32 of 64 bit PFRA
    0004    4 Signed       4 PAG64W1 (0)    ESAME PTE Word 1
    0004    4 Signed       4 PAGGPFRR       Bits 32-51 of 64 bit PFRA, plus
                                            12 status bits
              00000008       PAGGLENG       *-PAGGENTR Length of one page
                                            table entry
    0008    8 Signed       4 PAGGNEXT (0)   Next page table entry
    0000    0 Signed       4 *              Architected as bits 0-31 of the
                                            4K aligned page frame real
                                            address (if valid in storage). If
                                            I-bit is on, this is used by .
                                            software to store an XSTORE .
                                            block number.
    0004    4 Signed       2 *              Architected as bits 32-47 of the
                                            4K aligned page frame real
                                            address (if valid in storage). If
                                            I-bit is on, this is used by .
                                            software to store part of the .
                                            PTRM virtual address.
    0006    6 Bitstring    1 PAGGSTAT       Architected as bits 48-51 of the
                                            4K aligned page frame real
                                            address (if valid in storage)
                                            followed by four flag bits. If
                                            I-bit is on, this is used by .
                                            software to store part of the .
                                            PTRM virtual address.
              1111 ....      PAGGSPFR       X'F0' Bits 48-51 of PFRA (if
                                            valid) or bits 28-31 of XSBN (if
                                            valid in xstore)
              .... 1..1      PAGGSMBZ       X'09' Must be zero in any valid
                                            PTE
              .... .1..      PAGGINVA       X'04' PTE is invalid: I-bit
              .... ..1.      PAGGPROT       X'02' Page protected (read only):
                                            P-bit
              .... .1.1      PAGGSXVA       X'05' Page is invalid, but is
                                            valid in xstore This is a
                                            non-architected . software
                                            definition.
    0007    7 Bitstring    1 PAGGSTA2       Contains non-architected .
                                            software definitions when . I-bit
                                            is on. Contains L-bit . when
                                            I-bit if off.
              1111 111.      PAGGS2PG       X'FE' Reserved bits if PTE is
                                            valid Architected definitions
                                            when I-bit is off.
              .... ...1      PAGGS2LK       X'01' Lock bit (used by LKPG)
                                            when PTE in valid. Software
                                            definitions when I-bit is on.
              .... .1..      PAGGS2XR       X'04' R (Reference) bit if PTE is
                                            invalid, but valid in xstore
              .... ...1      PAGGS2XL       X'01' L (Lock) bit if PTE is
                                            invalid, but valid in xstore
    0000    0 Signed       4 PAGGXSBN       Xstore block number. Only valid
                                            when PTE is invalid and PGSXSTOR
                                            is set in corresponding PGSTE.
                                            For MDC PTEs, only valid when PTE
                                            is invalid in real storage, but
                                            valid in xstore. This is a
                                            non-architected . software
                                            definition.
    0004    4 Signed       4 *              Reserved for IBM use
         Note that in the ESAME PTE format, unlike the ESA/390 PTE format, we
         use the same layout for MDC PTEs as for all other PTEs.
         *

#### PAG64 Storage Layout

    *** PAG64 - Page Table Entry
    *
    *     +-------------------------------------------------------+
    *   0 |                       PAGGENTR                        |
    *     +-------------------------------------------------------+
    *   8
    *
    *** PAG64 - Page Table Entry

    *** Overlay for PAGGENTR in PAG64
    *
    *     +---------------------------+---------------------------+
    *   0 |         PAGGPFRL          |         PAGGPFRR          |
    *     +---------------------------+---------------------------+
    *
    *** Overlay for PAGGENTR in PAG64

    *** Overlay for PAGGENTR in PAG64
    *
    *     +---------------------------+-------------+------+------+
    *   0 |///////////////////////////|/////////////|:GSTAT|:GSTA2|
    *     +---------------------------+-------------+------+------+
    *   8
    *
    *** Overlay for PAGGENTR in PAG64

    *** Overlay for PAGGENTR in PAG64
    *
    *     +---------------------------+---------------------------+
    *   0 |         PAGGXSBN          |///////////////////////////|
    *     +---------------------------+---------------------------+
    *   8
    *
    *** Overlay for PAGGENTR in PAG64

#### PAG64 Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    PAGGENTR       0000
    PAGGINVA       0006 04
    PAGGINVR       0000 00000400
    PAGGLENG       0004 00000008
    PAGGLOKR       0000 01
    PAGGNEXT       0008
    PAGGPFAH       0000 00FFFFFF
    PAGGPFAL       0000 00FFF000
    PAGGPFRL       0000
    PAGGPFRR       0004
    PAGGPROR       0000 00000200
    PAGGPROT       0006 02
    PAGGPTMH       0000 00FFFFFF
    PAGGPTML       0000 00FFF800
    PAGGRSDR       0000 FE
    PAGGRSVR       0000 00000900
    PAGGSMBZ       0006 09
    PAGGSPFR       0006 F0
    PAGGSTAT       0006
    PAGGSTA2       0007
    PAGGSXVA       0006 05
    PAGGS2LK       0007 01
    PAGGS2PG       0007 FE
    PAGGS2XL       0007 01
    PAGGS2XR       0007 04
    PAGGXBNBL      0000 00000000
    PAGGXBNBR      0000 00000020
    PAGGXBNH       0000 00FFFFFF
    PAGGXBNL       0000 00
    PAGGXIVR       0000 00000500
    PAGGXSBN       0000
    PAGGXSLR       0000 01
    PAGGXSRR       0000 04
    PAG64W0        0000
    PAG64W1        0004

This information is based on z/VM V4R3.0. Last updated on 1 May 2002 at 10:59:22 EDT.
Copyright IBM Corporation, 1990, 2002