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Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure ALEBK Access List Entry
0000 0 Bitstring 16 ALE (0)
0000 0 Signed 4 ALEW0 (0) The first word of the ALEBK
.... .... ALEW0INV X'80000000' ALEW0INV Invalid bit
in ALE word 0
000ALEW0 ALEW0SNM X'00FF0000' ALEW0SNM ALE sequence
number in word 0
000ALEW0 ALEW0SIG X'83FFFFFF' ALEW0SIG Defined bits
in ALE word 0
0000 0 Bitstring 1 ALE0 First byte of entry
1... .... ALEINV X'80' ALEINV Access List Entry
INValid bit - '1'B = the
access-list entry is invalid.
During AR translation involving
this ALE, an ALEN-translation
exception is recognized.
.... ..1. ALEFONLY X'02' ALEFONLY Fetch only bit -
indicates fetch only access to
address space
.... ...1 ALEPRIV X'01' ALEPRIV PRIVate Bit - '0'B
= any program can use this entry.
'1'B = programs must have an EAX
(in CR8) which is identical to
ALEAX, or the EAX (in CR8) must
select an authority table
secondary bit with a value of 1.
0001 1 Bitstring 1 ALESN ALE Sequence Number - is compared
against the ALETSN in the ALET
during access-register
translation. Inequality causes an
ALE-sequence exception to be
recognized.
0002 2 Signed 2 ALEAX ALE Authorization IndeX - may be
used to determine whether the
program for which AR translation
is being performed is authorized
to use the access-list entry. See
ALEPRIV for more info.
0004 4 Bitstring 4 * Reserved Bits 0 and 28-30 of the
following field must be zeros.
0008 8 Address 4 ALEASTE (0) ASN Second Table Entry origin -
the address of the ASTE for the
specified address space.
00FFFFC0 ALEASTOM X'7FFFFFC0' Significant bits of
ASTE origin. ANDed with ALEASTE
to isolate address.
0008 8 Bitstring 1 * (3) Skip first three bytes of ASTEO
000B 11 Bitstring 1 ALEFLAGS Flag byte origin.
..1. .... ALERPRG1 X'20' Reserved for programming
(in use)
ALERPGR1 has two programming use definitions, one for use in
the CP-use access list (ALENTDSP) and one for use in guest
access lists (ALEPFAUL). Since an individual Access List
Entry cannot be in both types of list at once, these two
redefinitions of ALERPRG1 do not overlap.
..1. .... ALENTDSP X'20' When set in the CP-use
access list, indicates the ALE
designates an address space not
owned by the dispatched user.
..1. .... ALEPFAUL X'20' When set in a guest access
list, indicates page faults are
eligible for asynchronous
processing. (Pseudo page-fault
bit)
...1 .... ALERPRG2 X'10' Reserved for programming
(in use)
...1 .... ALERACC X'10' When set in a host access
list, indicates the ALE
designates that the address space
be accessed with r-access.
Otherwise, i-access should be
used.
000C 12 Bitstring 4 ALEASTSN ASTE Sequence Number - compared
against an ASTE sequence number
(ASTSN) in the designated ASTE
during access-register
translation.
00000010 ALELEN *-ALEBK Entry size in bytes
00000002 ALESIZE (ALELEN+7)/8 Size in doublewords
of the ALE
*cmnt** ORG ALEBK+ALELEN Redefinition for second ALE
in an access list:
0010 16 Bitstring 8 * Reserved Area reserved for
programming...
0018 24 Address 4 ALEALCBK In access lists built by CP, the
second access-list entry in each
access list (the one with ALEN=1)
contains a pointer to the ALCBK,
CP's access-list control block.
001C 28 Signed 4 * Reserved for programming
00000004 ALENSHFT 4 Shift needed to transform ALEN
into byte offset into access
list.
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