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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
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