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Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
STDG
Control Block Contents
STDG DSECT
Cross Reference (Contains links to field and bit definitions)
STDG Control Block Content
STDG DSECT
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
*** STDG - Architected version of the z/Arch * * +---------------------------+-------------+------+------+ * 0 |///////////////////////////|/////////////|STDG6 |STDG7 | * +------+--------------------+-------------+------+------+ * 8 |:GRBIT| 9 * +------+ * *** STDG - Architected version of the z/Arch
STDG Cross Reference
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
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