PAGG Back to Index page
 
Prolog 
Control Block Contents 
   PAGG 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.


  PAGG Prolog Top of page
  
 NAME       : HCPPAGG
 DESCRIPTION: Page Table Entry for z/Architecture
 DSECT      : PAGG
 FUNCTION   : A Page Table Entry is a hardware architected
              area that describes one 4K page of virtual
              storage.
 RELOCATION CONSIDERATIONS : None
 
 
  PAGG Control Block Content Top of page
  




 PAGG DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      PAGG           Page Table Entry for z/Architecture
0000    0 Dbl-Word     8 PAGGENTR       PTEs are 8 bytes in z/Arch
0000    0 Signed       4 PAG64W0 (0)    PTE Word 0
0000    0 Signed       4 PAGGPFRL       Bits 0-31 of 64 bit PFRA
0004    4 Signed       4 PAGGPFRR       Bits 32-51 of 64 bit PFRA, plus
                                        status bits
          00000008       PAGGLENG       *-PAGGENTR Length of 1 PTE
          00000003       PAGGSZSHF      3 Shift value to multiply by size
                                        of a PTE
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 page is resident)
0004    4 Signed       2 *              Architected as bits 32-47 of the
                                        4K aligned page frame real
                                        address (if page is resident)
0006    6 Bitstring    1 PAGGSTAT       Architected as bits 48-51 of the
                                        4K aligned page frame real
                                        address (if page is resident),
                                        followed by four flag bits:
          1111 ....      PAGGSPFR       X'F0' PAGGSPFR Bits 48-51 of PFRA
                                        (if resident)
          .... 1..1      PAGGSMBZ       X'09' PAGGSMBZ Must be zero in
                                        any valid PTE when EDAT-1 does
                                        not apply.
          .... 1...      PAGGEMBZ       X'08' PAGGEMBZ Must be zero in
                                        any valid PTE when EDAT-1 does
                                        apply.
          .... .1..      PAGGINVA       X'04' PAGGINVA Page-Table Entry
                                        is invalid
          .... ..1.      PAGGPROT       X'02' PAGGPROT PTE is page
                                        protected-read only
          .... ...1      PAGGIEP        X'01' PAGGIEP PTE is IEP
                                        protected
0007    7 Bitstring    1 PAGGSTA2       Has 7 reserved bits and lock bit
          1111 111.      PAGGS2PG       X'FE' PAGGS2PG Reserved bits
          .... ...1      PAGGS2LK       X'01' PAGGS2LK Lock bit (used by
                                        LKPG) 64-bit mask
                                        X'FFFFFFFFFFFFF800' to compute a
                                        PTO from a PTE address.
          PAGGSTA2       PAGGPTMH       X'FFFFFFFF' PAGGPTMH Isolate high
                                        half of PTOM
          PAGGSTA2       PAGGPTML       X'FFFFF800' PAGGPTML Isolate low
                                        half of PTOM 64-bit mask
                                        X'FFFFFFFFFFFFF000' - See
                                        PFXGPFRA.
          PAGGSTA2       PAGGPFAH       X'FFFFFFFF' PAGGPFAH Isolate high
                                        half of PFRA
          PAGGSTA2       PAGGPFAL       X'FFFFF000' PAGGPFAL Isolate low
                                        half of PFRA 64-bit mask
                                        X'0000000000000400' 32-bit high
                                        X'00000000' High half of mask
          PAGGSTA2       PAGGINVR       X'00000400' PAGGINVR Isolate I
                                        bit 64-bit mask
                                        X'0000000000000200' 32-bit high
                                        X'00000000' High half of mask
          PAGGSTA2       PAGGPROR       X'00000200' PAGGPROR Isolate P
                                        bit 64-bit mask
                                        X'0000000000000100' 32-bit high
                                        X'00000000' High half of mask
          PAGGSTA2       PAGGIEPR       X'00000100' PAGGIEPR Isolate IEP
                                        bit 64-bit mask
                                        X'0000000000000900' 32-bit high
                                        X'00000000' High half of mask
          PAGGSTA2       PAGGRSVR       X'00000900' PAGGRSVR Reserved
                                        bits, must be 0 in any valid
                                        z/Arch PTE when EDAT-1 does not
                                        apply and IEP is not installed
          PAGGSTA2       PAGGRSVE       X'00000800' PAGGRSVE Reserved
                                        bits, must be 0 in any valid
                                        z/Arch PTE when EDAT-1 applies or
                                        IEP is installed 64-bit mask
                                        X'0000000000000001' 32-bit high
                                        X'00000000' High half of mask
          .... ...1      PAGGXSLR       X'00000001' PAGGXSLR Isolate L
                                        bit (Lock bit)
 
 
  PAGG Storage Layout Top of page
  
          
*** PAGG - Page Table Entry for z/Architecture
*
*     +-------------------------------------------------------+
*   0 |                       PAGGENTR                        |
*     +-------------------------------------------------------+
*   8
*
*** PAGG - Page Table Entry for z/Architecture
          
*** Overlay for PAGGENTR in PAGG
*
*     +---------------------------+---------------------------+
*   0 |         PAGGPFRL          |         PAGGPFRR          |
*     +---------------------------+---------------------------+
*
*** Overlay for PAGGENTR in PAGG
          
*** Overlay for PAGGENTR in PAGG
*
*     +---------------------------+-------------+------+------+
*   0 |///////////////////////////|/////////////|:GSTAT|:GSTA2|
*     +---------------------------+-------------+------+------+
*   8
*
*** Overlay for PAGGENTR in PAGG
 
 
  PAGG Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
PAGGEMBZ       0006 08
PAGGENTR       0000
PAGGIEP        0006 01
PAGGIEPR       0007 PAGGSTA2
PAGGINVA       0006 04
PAGGINVR       0007 PAGGSTA2
PAGGLENG       0004 00000008
PAGGNEXT       0008
PAGGPFAH       0007 PAGGSTA2
PAGGPFAL       0007 PAGGSTA2
PAGGPFRL       0000
PAGGPFRR       0004
PAGGPROR       0007 PAGGSTA2
PAGGPROT       0006 02
PAGGPTMH       0007 PAGGSTA2
PAGGPTML       0007 PAGGSTA2
PAGGRSVE       0007 PAGGSTA2
PAGGRSVR       0007 PAGGSTA2
PAGGSMBZ       0006 09
PAGGSPFR       0006 F0
PAGGSTAT       0006
PAGGSTA2       0007
PAGGSZSHF      0004 00000003
PAGGS2LK       0007 01
PAGGS2PG       0007 FE
PAGGXSLR       0007 01
PAG64W0        0000
 
This information is based on z/VM 7.1.0 Last updated on 22 Jun 2018 at 11:51:16 EDT.
Copyright IBM Corporation, 1990, 2018