Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM. |
DDEV
Control Block Contents
DDEV DSECT
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 00000000 DDEVR 00 'R' LINK-MODE FOR OWNER 00000004 DDEVRR 04 'RR' LINK-MODE FOR OWNER 0000000C DDEVW 12 'W' LINK-MODE FOR OWNER 00000010 DDEVWR 16 'WR' LINK-MODE FOR OWNER 0000001C DDEVM 28 'M' LINK-MODE FOR OWNER 00000020 DDEVMR 32 'MR' LINK-MODE FOR OWNER 00000024 DDEVMW 36 'MW' LINK-MODE FOR OWNER 00000040 DDEVSR 64 DDEVS+DDEVR ('R' with stable) 0000004C DDEVSW 76 DDEVS+DDEVW ('W' with stable) 0000005C DDEVSM 92 DDEVS+DDEVM ('M' with stable) 00000080 DDEVER 128 DDEVE+DDEVR ('R' with exclusive) 0000008C DDEVEW 140 DDEVE+DDEVW ('W' with exclusive) 00000000 * 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 The following fields are defined for Virtual CTCA (VCTC). and MSGP entries. 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) 0020 32 Character 4 DDEVCTCD CTCA Descriptor (see VDEVCTCD) 0024 36 Bitstring 2 DDEVMPBS MSGP buffer sets 0026 38 Bitstring 2 * Reserved field 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 | DDEVCTCD | DDEVMPBS |/////////////| * +---------------------------+-------------+-------------+ * 28 * *** Overlay for DDEVPASR in DDEV *** Overlay for DDEVWIDH in DDEV * * +-------------+-------------+ * 10 ... 12 | DDEVSE1H | DDEVSE2H | 16 * +-------------+-------------+ * *** Overlay for DDEVWIDH in DDEV
DDEV Cross Reference
Symbol Dspl Value -------------- ---- ----- * 0011 00000000 DDEVALNK 0010 DDEVBTS 0014 80 DDEVCLAS 0004 DDEVCNA 0016 40 DDEVCODE 0004 DDEVCTCD 0020 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 DDEVER 0011 00000080 DDEVESIZ 0048 0000000A DDEVESZB 0048 00000050 DDEVEW 0011 0000008C 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 DDEVM 0011 0000001C DDEVMODE 0011 DDEVMODL 0003 DDEVMPBS 0024 DDEVMR 0011 00000020 DDEVMSGP 0032 40 DDEVMW 0011 00000024 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 DDEVR 0011 00000000 DDEVRDEV 0030 DDEVRECC 0032 80 DDEVRELR 0002 01 DDEVRO 0002 02 DDEVRR 0011 00000004 DDEVS 0011 40 DDEVSCTL 0016 20 DDEVSCYL 0006 DDEVSEXT 0012 DDEVSE1H 0012 DDEVSE2H 0014 DDEVSIZE 0036 00000007 DDEVSM 0011 0000005C DDEVSPCL 0018 DDEVSR 0011 00000040 DDEVSW 0011 0000004C DDEVTDED 0002 10 DDEVTDSK 0002 04 DDEVTLNK 0002 40 DDEVTMDK 0002 80 DDEVTSPC 0002 20 DDEVTSPL 0002 08 DDEVTYPE 0005 DDEVUSER 0048 DDEVVSER 000A DDEVW 0011 0000000C DDEVWIDH 0012 DDEVWKAL 0016 80 DDEVWR 0011 00000010 DDEVYMDC 0016 01 DDEV4WCG 0015 80
Last updated on 5 Jun 2001 at 13:19:31 EDT.
Copyright IBM Corporation, 1990, 2001