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Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
ASCE
Control Block Contents
ASCE DSECT
Cross Reference (Contains links to field and bit definitions)
ASCE Prolog
NAME : HCPASCE
DESCRIPTION: Address-Space-Control Element
DSECT : ASCE
FUNCTION : This DSECT maps a z/Arch address-space-control
element. The format of an address-space-control
element is architected, and described in the
Principles of Operation.
LOCATED BY : CR1 is the ASCE for the primary address space.
CR7 is the ASCE for the secondary address space.
CR13 is the ASCE for the home address space.
ASTASCE in an ASTE.
VMDPASCE is the ASCE for a virtual CPU's current
primary address space.
PFXSXASC is the ASCE for the system-execution space.
CREATED BY : HCPASMCR when an address space is created.
HCPSSMCR when the system-execution address space is
created.
HCPFMUSG when the full track cache address space
is created.
HCPHDTMA when an address space is expanded.
HCPHDTNL when an address space is compressed.
DELETED BY : HCPASMDS when the address space is destroyed.
RELOCATION CONSIDERATIONS : None
ASCE Control Block Content
ASCE DSECT
Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure ASCE Address-Space-Control Element
ASCE - 8 bytes, 64 bits
0000 0 Dbl-Word 8 ASCEALL (0) Entire ASCE
64-bit mask X'FFFFFFFFFFFFF000' Isolate STO, RTO or RSTO
00000AF0 ASCEMSK PFXGPFRA 64-bit mask in PFXPG
00FFFFFF ASCETOMH X'FFFFFFFF' High word of mask
value
00000AF4 ASCEMSKL PFXGPFRA+4,4 Low word of mask in
PFXPG
00FFF000 ASCETOML X'FFFFF000' Low word of mask
value
The next four masks are also used by the STD, RTD and RSD.
64-bit mask X'0000000000000200'
32-bit high X'00000000'
00000200 ASCEGSM X'00000200' Isolate
subspace-group control bit
64-bit mask X'0000000000000100'
32-bit high X'00000000'
00000100 ASCEPSM X'00000100' Isolate private-space
control bit
64-bit mask X'0000000000000080'
32-bit high X'00000000'
1... .... ASCESSM X'00000080' Isolate
storage-alteration- event control
bit
64-bit mask X'0000000000000040'
32-bit high X'00000000'
.1.. .... ASCEXSM X'00000040' Isolate
space-switch-event control bit
64-bit mask X'0000000000000020'
32-bit high X'00000000'
..1. .... ASCERBM X'00000020' Isolate real-space
control bit - R=0: ASCE is an RTD
or STD - R=1: ASCE is an RSD
64-bit mask X'000000000000000C'
32-bit high X'00000000'
.... 11.. ASCEDTMK X'0000000C' Isolate designation
type bits
00000002 ASCEDTSHF 2 Bits DT is offset from right
edge of ASCE
64-bit mask X'0000000000000003'
32-bit high X'00000000'
.... ..11 ASCETLMK X'00000003' Isolate table length
bits
0000000C ASCETLBYT 12 Bits to shift (TL+1) to get
number of bytes in table
0000 0 Signed 4 ASCEW0 (0) ASCE Word 0
0000 0 Bitstring 1 ASCEW0B0 (0) ASCE Word 0 Byte 0
0000 0 Bitstring 1 ASCEBYT0 ASCE Byte 0
0001 1 Bitstring 1 ASCEW0B1 (0) ASCE Word 0 Byte 1
0001 1 Bitstring 1 ASCEBYT1 ASCE Byte 1
0002 2 Bitstring 1 ASCEW0B2 (0) ASCE Word 0 Byte 2
0002 2 Bitstring 1 ASCEBYT2 ASCE Byte 2
0003 3 Bitstring 1 ASCEW0B3 (0) ASCE Word 0 Byte 3
0003 3 Bitstring 1 ASCEBYT3 ASCE Byte 3
0004 4 Signed 4 ASCEW1 (0) ASCE Word 1
0004 4 Bitstring 1 ASCEW1B0 (0) ASCE Word 1 Byte 0
0004 4 Bitstring 1 ASCEBYT4 ASCE Byte 4
0005 5 Bitstring 1 ASCEW1B1 (0) ASCE Word 1 Byte 1
0005 5 Bitstring 1 ASCEBYT5 ASCE Byte 5
0006 6 Bitstring 1 ASCEW1B2 (0) ASCE Word 1 Byte 2
0006 6 Bitstring 1 ASCEBYT6 ASCE Byte 6
.... ..1. ASCEGBIT X'02' Subspace-group control bit
.... ...1 ASCEPBIT X'01' Private-space control bit
0007 7 Bitstring 1 ASCEW1B3 (0) ASCE Word 1 Byte 3
0007 7 Bitstring 1 ASCEBYT7 ASCE Byte 7
1... .... ASCESBIT X'80' Storage-alteration-event
control bit
.1.. .... ASCEXBIT X'40' Space-switch-event control
bit
..1. .... ASCERBIT X'20' Real-space control bit -
R=0: ASCE is an RTD or STD - R=1:
ASCE is an RSD
.... 11.. ASCETBIT X'0C' Designation type bits The
following four designation type
bits are valid only if the
real-space control bit (ASCERBIT)
= zero (R=0)
.... 11.. ASCERFTD X'0C' ASCE is an RFT designation
.... 1... ASCERSTD X'08' ASCE is an RST designation
.... .1.. ASCERTTD X'04' ASCE is an RTT designation
.... .... ASCESTD X'00' ASCE is an ST designation
.... ..11 ASCELBIT X'03' Table length bits
ASCE Storage Layout
*** ASCE - Address-Space-Control Element
*
*
*** ASCE - Address-Space-Control Element
*** Overlay for ASCE in ASCE
*
* +------+------+------+------+------+------+------+------+
* 0 |:EBYT0|:EBYT1|:EBYT2|:EBYT3|:EBYT4|:EBYT5|:EBYT6|:EBYT7|
* +------+------+------+------+------+------+------+------+
* 8
*
*** Overlay for ASCE in ASCE
ASCE Cross Reference
Symbol Dspl Value -------------- ---- ----- ASCEALL 0000 ASCEBYT0 0000 ASCEBYT1 0001 ASCEBYT2 0002 ASCEBYT3 0003 ASCEBYT4 0004 ASCEBYT5 0005 ASCEBYT6 0006 ASCEBYT7 0007 ASCEDTMK 0000 0C ASCEDTSHF 0000 00000002 ASCEGBIT 0006 02 ASCEGSM 0000 00000200 ASCELBIT 0007 03 ASCEMSK 0000 00000AF0 ASCEMSKL 0000 00000AF4 ASCEPBIT 0006 01 ASCEPSM 0000 00000100 ASCERBIT 0007 20 ASCERBM 0000 20 ASCERFTD 0007 0C ASCERSTD 0007 08 ASCERTTD 0007 04 ASCESBIT 0007 80 ASCESSM 0000 80 ASCESTD 0007 00 ASCETBIT 0007 0C ASCETLBYT 0000 0000000C ASCETLMK 0000 03 ASCETOMH 0000 00FFFFFF ASCETOML 0000 00FFF000 ASCEW0 0000 ASCEW0B0 0000 ASCEW0B1 0001 ASCEW0B2 0002 ASCEW0B3 0003 ASCEW1 0004 ASCEW1B0 0004 ASCEW1B1 0005 ASCEW1B2 0006 ASCEW1B3 0007 ASCEXBIT 0007 40 ASCEXSM 0000 40
Copyright IBM Corporation, 1990, 2011