STDG Back to Index page
 
Prolog 
Control Block Contents 
   STDG 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.

 
  STDG Control Block Content Top of page
 

 STDG DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure STDG Architected version of the z/Arch 0000 0 Dbl-Word 8 STDGES (0) Entire STD 64-bit mask X'FFFFFFFFFFFFF000' 00000AF0 STDGSTOM PFXGPFRA Isolate STO, 64-bit mask 00FFF000 STDGSTOML X'FFFFF000' Isolate STO, 32-bit mask 64-bit mask X'0000000000000200' 32-bit high X'00000000' 00000200 STDGSSGM X'00000200' Isolate subspace-group control bit 64-bit mask X'0000000000000100' 32-bit high X'00000000' 00000100 STDGPSM X'00000100' Isolate private-space bit 64-bit mask X'0000000000000080' 32-bit high X'00000000' 1... .... STDGSAEM X'00000080' Isolate storage-alteration event bit 64-bit mask X'0000000000000040' 32-bit high X'00000000' .1.. .... STDGSWEM X'00000040' Isolate space-switch- event bit 64-bit mask X'0000000000000020' 32-bit high X'00000000' ..1. .... STDGRBM X'00000020' Isolate real-space control bit (zero in zArch STD) 64-bit mask X'000000000000000C' 32-bit high X'00000000' .... 11.. STDGDTBM X'0000000C' Isolate designation type control bits (must be B'00' in a z/Arch STD) 64-bit mask X'0000000000000003' 32-bit high X'00000000' .... ..11 STDGSTLM X'00000003' Isolate segment-table length 00001000 STDGSTUNT 4096 Number of bytes in a "segment- table unit", the number of bytes in the smallest variation of the size of a segment table. .... .... STDGSTL0 X'00' 1 4096-byte block (to address up to 512M) .... ..11 STDGSTLF X'03' 4 4096-byte blocks (to address up to 2048M == 2G) 0000000C STDGSTUNS 12 Number of bits to shift left in order to multiply by STDGSTUNT. Also, number of bits to shift to convert between STE offset and corresponding STL value. 0000001D STDGSXSTL 20+9 Bits to shift to convert between an isolated segment index and the corresponding segment- table length. Also used to convert between STL units and addressable bytes. 0000001A STDGSXDWS STDGSXSTL-3 Bits to shift to convert between an isolated segment index (or number of addressable bytes) and doublewords of segment table space required. 00000009 STDGDWSTL 9 Bits to shift to convert between STL units and segment table length in doublewords. 0000000C STDGBYSTL 12 Bits to shift to convert between STL units and segment table length in bytes. 00000011 STDGSXDSP 20-3 Bits to shift right an isolated segment index to obtain the displacement into the segment table of the applicable STE. 0000 0 Signed 4 * Bytes 0-3 of STDG 0004 4 Signed 2 * Bytes 4-5 of STDG 0006 6 Bitstring 1 STDG6 STDG, byte 6 1111 .... STDG6STO X'F0' STDG6STO Reserved, nibble part of STO .... ..1. STDGSSGRP X'02' STDGSSGRP Subspace-Group bit. When set, indicates that the address space specified by the STDG is part of a subspace group. .... ...1 STDGPRIVS X'01' STDGPRIVS Private-space bit. When set, prefixing, low-address protection, and fetch- protection override to not apply to DAT references. 0007 7 Bitstring 1 STDG7 STDG, byte 7 1... .... STDGSAE X'80' STDGSAE Storage-alteration-event bit. When set, storage-alteration PER events in this address space are enabled via the storage-alteration-space control bit of CR9. .1.. .... STDGSWE X'40' STDGSWE Space-switch event bit. When set, space-switch event program interruptions are recognized when space switches occur. 0008 8 Bitstring 1 STDGRBIT Real-space control bit (R bit) (Must be zero in a z/Arch STDG) .... 11.. STDGTBIT X'0C' Designation type bits (DT bits) (must be B'00' in zArch STDG) .... ..11 STDGSTLX X'03' Segment-table length field 00000009 STDGSLEN *-STDGES Length in bytes of STDG 00000002 STDGSSIZE (STDGSLEN+7)/8 Size in DW of STDG
 
 
  STDG Storage Layout Top of page
 
          
*** STDG - Architected version of the z/Arch
*
*     +---------------------------+-------------+------+------+
*   0 |///////////////////////////|/////////////|STDG6 |STDG7 |
*     +------+--------------------+-------------+------+------+
*   8 |:GRBIT| 9
*     +------+
*
*** STDG - Architected version of the z/Arch
 
 
  STDG Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
STDGBYSTL      0000 0000000C
STDGDTBM       0000 0C
STDGDWSTL      0000 00000009
STDGES         0000
STDGPRIVS      0006 01
STDGPSM        0000 00000100
STDGRBIT       0008
STDGRBM        0000 20
STDGSAE        0007 80
STDGSAEM       0000 80
STDGSLEN       0008 00000009
STDGSSGM       0000 00000200
STDGSSGRP      0006 02
STDGSSIZE      0008 00000002
STDGSTLF       0000 03
STDGSTLM       0000 03
STDGSTLX       0008 03
STDGSTL0       0000 00
STDGSTOM       0000 00000AF0
STDGSTOML      0000 00FFF000
STDGSTUNS      0000 0000000C
STDGSTUNT      0000 00001000
STDGSWE        0007 40
STDGSWEM       0000 40
STDGSXDSP      0000 00000011
STDGSXDWS      0000 0000001A
STDGSXSTL      0000 0000001D
STDGTBIT       0008 0C
STDG6          0006
STDG6STO       0006 F0
STDG7          0007
 
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:56:06 EDT.
Copyright IBM Corporation, 1990, 2013