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Programming Interface Information:
This information is NOT
intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only. |
ACABK
Cross Reference (Contains links to field and bit definitions)
ACABK Prolog
Name : HCPVEXBK
Description: Map CASBKs at beginning of VEXBK.
DSECT : ACABK
Notes : The following maps the area at the beginning of the
VEXBK which contains the CASBKs. Hence, this DSECT
is called the ACABK (Area for Contiguous Available
Slots). The ACABK is used to avoid checking for
page or spool slots numerous times.
ACABK Control Block Content
ACABK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure ACABK Map CASBKs at beginning of VEXBK. 0000 0 Signed 4 ACACAS (16) Contains 16 CASBKS used by slot allocation. 0040 64 Signed 4 ACACURSL Current slot number in EXTBK (start search for new CASBK here) 0044 68 Signed 4 ACALSTSL Last slot in current cylinder 0048 72 Signed 4 ACACURCY Current cylinder in EXTBK 004C 76 Signed 4 ACAEXTBK Pointer to current EXTBK 0050 80 Bitstring 1 ACAFIRST Index into ACABK of first CASBK 0051 81 Bitstring 1 ACALAST Index into ACABK of last CASBK 0052 82 Bitstring 1 ACAFLAG Flags 1... .... ACAREDO X'80' Slots were allocated by a method other than slot alloc. (PGC or PGTDA) Redo CASBKs before slot allocation. .1.. .... ACAANYRP X'40' No minimum size when searching for a replacement CASBK. (space is fragmented) ..1. .... ACAANYAL X'20' Take any size CASBK when searching for a block for allocation. (this is set temporarily for large block requests) ...1 .... ACAINIT X'10' CASBKs have been initialized 0053 83 Bitstring 1 * (5) Reserved for IBM use 00000058 ACASIZE *-ACABK Size of area for CASBKs.
ACABK Storage Layout
*** ACABK - Map CASBKs at beginning of VEXBK. * * +-------------------------------------------------------+ * 0 | | * = ACACAS = * | | * +---------------------------+---------------------------+ * 40 | ACACURSL | ACALSTSL | * +---------------------------+---------------------------+ * 48 | ACACURCY | ACAEXTBK | * +------+------+------+------+---------------------------+ * 50 |:FIRST|:LAST |:FLAG |//////////////////////////////////| * +------+------+------+----------------------------------+ * 58 * *** ACABK - Map CASBKs at beginning of VEXBK.
ACABK Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----ACAANYAL 0052 20
ACAANYRP 0052 40
ACACAS 0000
ACACURCY 0048
ACACURSL 0040
ACAEXTBK 004C
ACAFIRST 0050
ACAFLAG 0052
ACAINIT 0052 10
ACALAST 0051
ACALSTSL 0044
ACAREDO 0052 80
ACASIZE 0053 00000058
Last updated on 3 Aug 1999 at 13:44:57 EDT.
Copyright IBM Corporation, 1990, 1999