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. |
DDEV
Cross Reference (Contains links to field and bit definitions)
DDEV Prolog
NAME : HCPDDEV DESCRIPTION: DIRECTORY DEVICE DEFINITION BLOCK DSECT : DDEV FUNCTION : THE HCPDDEV BLOCK DESCRIBES THE DEVICES ASSOCIATED WITH A VIRTUAL MACHINE AS SPECIFIED IN THE SYSTEM DIRECTORY LOCATED BY : DUNIDDAS FIELD OF HCPDUNDX DUNIDDSP FIELD OF HCPDUNDX CREATED BY : HCPDEF, HCPUDR DELETED BY : HCPDEF, HCPLND, HCPLNK
DDEV Control Block Content
DDEV DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure DDEV DIRECTORY DEVICE DEFINITION BLOCK 0000 0 Signed 2 DDEVDEV VIRTUAL DEVICE ADDRESS 0002 2 Bitstring 1 DDEVFLGA DIRECTORY DEVICE INFORMATION 1... .... DDEVTMDK X'80' MDISK DIRECTORY ENTRY .1.. .... DDEVTLNK X'40' LINK DIRECTORY ENTRY ..1. .... DDEVTSPC X'20' SPECIAL DIRECTORY ENTRY ...1 .... DDEVTDED X'10' DEDICATE DIRECTORY ENTRY .... 1... DDEVTSPL X'08' SPOOL / CONSOLE DIRECTORY ENTRY .... .1.. DDEVTDSK X'04' T-DISK TO BE ALLOCATED .... ..1. DDEVRO X'02' DEVICE IS READ ONLY .... ...1 DDEVRELR X'01' VIRTUAL RESERVE RELEASE REQUESTED 0003 3 Bitstring 1 DDEVMODL DIRECTORY DEVICE MODEL INFORMATION 0004 4 Bitstring 2 DDEVCODE (0) VIRTUAL DEVICE CLASS AND TYPE 0004 4 Bitstring 1 DDEVCLAS VIRTUAL DEVICE CLASS 0005 5 Bitstring 1 DDEVTYPE VIRTUAL DEVICE TYPE All releases of CP prior to ESA 2.0 use DDEVSCYL and DDEVECYL for minidisk extents. In ESA 2.0, DDEVSEXT and DDEVEEXT were defined for minidisk extents. These new fields were added for FBA because FBA minidisk extents are in blocks instead of cylinders and a block number could be larger than a halfword. But the time will come when CKD dasd is so large that cylinder extents may grow larger than a halfword. Starting with ESA 2.0, DDEVSEXT and DDEVEEXT should always be used for both CKD and FBA minidisk extents. ESA 2.0 must still be able to process directories created with previous supported releases of DIRECTXA. Because of this, directory processing modules must consider the possibility that the new fullword fields may not contain the minidisk extents. If the DDEVFWEX flag in DDEVFLGC is not on, then the old halfword fields will contain the minidisk extents. In this case, when HCPUDR gets a copy of the DDEV it will copy the contents of DDEVSCYL/DDEVECYL into DDEVSEXT/DDEVEEXT. So, starting with ESA 2.0, the rest of CP only needs to use the newly defined fullword fields. Directories created with ESA 2.0 (and later releases of CP) must be in a format that is compatible with all previous supported releases of CP. For this reason, CKD minidisk extents are still stored in the old halfword fields as well as the new fullword fields. When ESA 2.0 becomes the oldest supported release, DDEVSCYL and DDEVECYL will no longer need to be maintained. 0006 6 Bitstring 4 DDEVEXTN (0) CKD virtual dasd cylinder extents 0006 6 Signed 2 DDEVSCYL CKD virtual dasd start cylinder 0008 8 Signed 2 DDEVECYL CKD virtual dasd end cylinder 000A 10 Character 6 DDEVVSER VOLUME SERIAL NUMBER 0010 16 Bitstring 1 DDEVALNK TYPES OF LINKS ALLOW TO THIS DEV 1... .... DDEVLR X'80' READ LINKS ALLOWED .1.. .... DDEVLW X'40' WRITE LINKS ALLOWED ..1. .... DDEVLM X'20' MULT-WRITE LINKS ALLOWED 0011 17 Bitstring 1 DDEVMODE ACCESS MODE Decimal byte values 0-11 are read modes; 12-63 are write. For more understanding of how link access modes are used, see how DDEVMODE and LKX*MOD* are used in module HCPLNS. 1... .... DDEVE X'80' Exclusive link bit .1.. .... DDEVS X'40' Stable link bit 0012 18 Bitstring 1 DDEVWIDH PAPER WIDTH CODE FOR 3800 PRINTER 0013 19 Bitstring 1 DDEVLENH PAPER LEN FOR 3800 (HALF-INCHES) 0014 20 Bitstring 1 DDEVPRFG Virtual 3800 flag byte plus other miscellaneous bits 1... .... DDEVBTS X'80' BURSTER TRIMMER STACKER (BTS) .1.. .... DDEVFULL X'40' REFLECT ALL DATA CHECKS (DATCK) .... ...1 DDEVNOMS X'01' "NOCPMS" Attach command option 0015 21 Bitstring 1 DDEVFTRC DEVICE FEATURE CODES 1... .... DDEV4WCG X'80' 3800 HAS 4 WCGM'S (OFF = 2WCGM) 0016 22 Bitstring 1 DDEVFLGB ACCESS CONTROL FOR CACHE DASD 1... .... DDEVWKAL X'80' Working allegiance on minidisk .1.. .... DDEVCNA X'40' CACHING NOT AVAILABLE ..1. .... DDEVSCTL X'20' SUBSYSTEM CONTROL ...1 .... DDEVDCTL X'10' DEVICE CONTROL .... 1... DDEVNCTL X'08' NO CONTROL .... .1.. DDEVNMDC X'04' MINIOPT NOMDC specified .... ..1. DDEVQDSK X'02' V-disk will be allocated .... ...1 DDEVYMDC X'01' MINIOPT MDC specified 0017 23 Bitstring 1 DDEVFLGC EXTENSION OF DIRECTORY DEVICE INFO 1... .... DDEVNOSG X'80' "NOASSIGN" OPTION .1.. .... DDEVEND X'40' "END" SPECIFIED ON MDISK STATEMENT ..1. .... DDEVINV X'20' DDEV IS NOT VALID, IT WAS ONLY PARTIALLY FILLED IN AND SHOULD BE IGNORED ...1 .... DDEVFWEX X'10' The fullword extent fields are valid. DDEVSEXT and DDEVEEXT contain valid extent information. .... 1... DDEVDEVN X'08' "DEVNO" SPECIFIED ON MDISK STMT .... .1.. DDEVPROF X'04' DDEV was written as part of a PROFILE .... ..1. DDEVIOPS X'02' User set I/O Assist off for device .... ...1 DDEVFBA X'01' MDISK is on FBA dasd 0018 24 Dbl-Word 8 DDEVPASR PASSWORD FOR READ ACCESS 0020 32 Dbl-Word 8 DDEVPASW PASSWORD FOR WRITE ACCESS 0028 40 Dbl-Word 8 DDEVPASM PASSWORD FOR MULTIPLE ACCESS 0030 48 Signed 2 DDEVRDEV REAL DEVICE NUMBER 0032 50 Bitstring 1 DDEVFLGD Extension of cache and dev info 1... .... DDEVRECC X'80' RECORDMDC specified on MINIOPT .1.. .... DDEVMSGP X'40' SPECIAL MSGP Statement 0033 51 Bitstring 1 * RESERVED FOR IBM USE For object directories created from VM/ESA 2.0 and later... If the minidisk is defined on CKD DASD, DDEVEEXT will contain the ending cylinder number. If the minidisk is defined on FBA DASD, DDEVEEXT will contain the ending block number. The DDEVFWEX flag in DDEVFLGC will be on if DDEVEEXT contains valid information. See the comment for DDEVSCYL/DDEVECYL for more details. 0034 52 Signed 4 DDEVEEXT (0) Minidisk end extent 0034 52 Signed 2 DDEVEE1H First half of the ending extent 0036 54 Signed 2 DDEVEE2H Second half of the ending extent 00000007 DDEVSIZE (*-DDEV+7)/8 DDEV SIZE IN DW'S DDEVBLOK EXTENSION FOR DIRECTORY RECORD ON DASD WARNING: This DDEV extension is NOT utilized during LINK processing. As a result, all LINK related fields must be defined above. 0038 56 Signed 4 DDEVDASD SLOT ADDR OF NEXT USER RECORD CCPV for CKD DASD addresses PPPV for FBA DASD addresses 00000038 DDEVPAGE DDEVDASD,3 Page portion of DDEVDASD field CCP for CKD DASD addresses PPP for FBA DASD addresses 003C 60 Signed 2 DDEVDISP DISP OF NEXT RECORD INTO PAGE 003E 62 Signed 2 * RESERVED FOR FUTURE IBM USE 0040 64 Signed 4 * RESERVED FOR FUTURE IBM USE 0044 68 Character 4 DDEVLABL LABEL TO VALIDATE THIS BLOCK 0048 72 Character 8 DDEVUSER USER id to validate this block; will contain owning USER unless DDEVPROF is true, in which case it will contain SYSTEM. 0000000A DDEVESIZ (*-DDEV+7)/8 EXTENDED DDEVBK SIZE IN DW' S 00000050 DDEVESZB *-DDEV EXTENDED DDEVBK SIZE IN BYTES 0018 24 Character 1 DDEVSPCL SPOOL DEVICE OUTPUT CLASS 0019 25 Bitstring 1 DDEVGROP CONSOLE DEFINITION FLAGS 1... .... DDEVGRCN X'80' GRAPHICS CONSOLE 001A 26 Signed 2 DDEVLINK USER LINK TO DISK 001C 28 Signed 4 * RESERVED FOR FUTURE IBM USE 0020 32 Dbl-Word 8 DDEVLKID USER LINK TO USERID 0018 24 Dbl-Word 8 DDEVCTUS ALLOWED USERID TO COUPLE TO CTCA (OR BLANKS IF NO USERID SUPPLIED, INDICATING ANY USERID ALLOWED TO TO COUPLE TO THIS CTCA) For object directories created from VM/ESA 2.0 and later... If the minidisk is defined on CKD DASD, DDEVSEXT will contain the starting cylinder number. If the minidisk is defined on FBA DASD, DDEVSEXT will contain the starting block number. The DDEVFWEX flag in DDEVFLGC will be on if DDEVSEXT contains valid information. See the comment for DDEVSCYL/DDEVECYL for more details. 0012 18 Bitstring 4 DDEVSEXT (0) Minidisk start extent 0012 18 Bitstring 2 DDEVSE1H First half of starting extent 0014 20 Bitstring 2 DDEVSE2H Second half of starting extent
DDEV Storage Layout
*** DDEV - DIRECTORY DEVICE DEFINITION BLOCK * * +-------------+------+------+------+------+-------------+ * 0 | DDEVDEV |:VFLGA|:VMODL|:VCLAS|:VTYPE| DDEVSCYL | * +-------------+------+------+------+------+-------------+ * 8 | DDEVECYL | DDEVVSER | * +------+------+------+------+------+------+------+------+ * 10 |:VALNK|:VMODE|:VWIDH|:VLENH|:VPRFG|:VFTRC|:VFLGB|:VFLGC| * +------+------+------+------+------+------+------+------+ * 18 | DDEVPASR | * +-------------------------------------------------------+ * 20 | DDEVPASW | * +-------------------------------------------------------+ * 28 | DDEVPASM | * +-------------+------+------+-------------+-------------+ * 30 | DDEVRDEV |:VFLGD|//////| DDEVEE1H | DDEVEE2H | * +-------------+------+------+-------------+-------------+ * 38 | DDEVDASD | DDEVDISP |/////////////| * +---------------------------+-------------+-------------+ * 40 |///////////////////////////| DDEVLABL | * +---------------------------+---------------------------+ * 48 | DDEVUSER | * +-------------------------------------------------------+ * 50 * *** DDEV - DIRECTORY DEVICE DEFINITION BLOCK *** Overlay for DDEVPASR in DDEV * * +------+------+-------------+---------------------------+ * 18 |:VSPCL|:VGROP| DDEVLINK |///////////////////////////| * +------+------+-------------+---------------------------+ * 20 | DDEVLKID | * +-------------------------------------------------------+ * 28 * *** Overlay for DDEVPASR in DDEV *** Overlay for DDEVPASR in DDEV * * +-------------------------------------------------------+ * 18 | DDEVCTUS | * +-------------------------------------------------------+ * 20 * *** Overlay for DDEVPASR in DDEV *** Overlay for DDEVWIDH in DDEV * * +-------------+-------------+ * 10 ... 12 | DDEVSE1H | DDEVSE2H | 16 * +-------------+-------------+ * *** Overlay for DDEVWIDH in DDEV
DDEV Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----DDEVALNK 0010
DDEVBTS 0014 80
DDEVCLAS 0004
DDEVCNA 0016 40
DDEVCODE 0004
DDEVCTUS 0018
DDEVDASD 0038
DDEVDCTL 0016 10
DDEVDEV 0000
DDEVDEVN 0017 08
DDEVDISP 003C
DDEVE 0011 80
DDEVECYL 0008
DDEVEEXT 0034
DDEVEE1H 0034
DDEVEE2H 0036
DDEVEND 0017 40
DDEVESIZ 0048 0000000A
DDEVESZB 0048 00000050
DDEVEXTN 0006
DDEVFBA 0017 01
DDEVFLGA 0002
DDEVFLGB 0016
DDEVFLGC 0017
DDEVFLGD 0032
DDEVFTRC 0015
DDEVFULL 0014 40
DDEVFWEX 0017 10
DDEVGRCN 0019 80
DDEVGROP 0019
DDEVINV 0017 20
DDEVIOPS 0017 02
DDEVLABL 0044
DDEVLENH 0013
DDEVLINK 001A
DDEVLKID 0020
DDEVLM 0010 20
DDEVLR 0010 80
DDEVLW 0010 40
DDEVMODE 0011
DDEVMODL 0003
DDEVMSGP 0032 40
DDEVNCTL 0016 08
DDEVNMDC 0016 04
DDEVNOMS 0014 01
DDEVNOSG 0017 80
DDEVPAGE 0038 00000038
DDEVPASM 0028
DDEVPASR 0018
DDEVPASW 0020
DDEVPRFG 0014
DDEVPROF 0017 04
DDEVQDSK 0016 02
DDEVRDEV 0030
DDEVRECC 0032 80
DDEVRELR 0002 01
DDEVRO 0002 02
DDEVS 0011 40
DDEVSCTL 0016 20
DDEVSCYL 0006
DDEVSEXT 0012
DDEVSE1H 0012
DDEVSE2H 0014
DDEVSIZE 0036 00000007
DDEVSPCL 0018
DDEVTDED 0002 10
DDEVTDSK 0002 04
DDEVTLNK 0002 40
DDEVTMDK 0002 80
DDEVTSPC 0002 20
DDEVTSPL 0002 08
DDEVTYPE 0005
DDEVUSER 0048
DDEVVSER 000A
DDEVWIDH 0012
DDEVWKAL 0016 80
DDEVYMDC 0016 01
DDEV4WCG 0015 80
Last updated on 3 Aug 1999 at 11:51:05 EDT.
Copyright IBM Corporation, 1990, 1999