Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM. |
FIOBK
Control Block Contents
FIOBK DSECT
Cross Reference (Contains links to field and bit definitions)
FIOBK Prolog
NAME : HCPFIOBK DESCRIPTION: FORMATTED I/O BLOCK DSECT : FIOBK FUNCTION : DEFINE DASD I/O REQUEST TO STAND-ALONE DASD I/O ROUTINE WITH A DESCRIPTION OF THE AREA ON THE VOLUME THAT IS TO USED. THE DATA CAN BE ACCESSED BY using either a relative block number or an ASA. LOCATED BY : GENERAL PURPOSE REGISTER 1 ON ENTRY TO HCPLODAS CREATED BY : HCPCKPRS - BEFORE SYSTEM INITIALIZATION ON A SYSTEM BOUNCE HCPCKPSH - DURING AN ABNORMAL TERMINATION OR SHUTDOWN HCPLODNC - DURING THE SYSTEM LOAD PROCESS DELETED BY : FIOBK IS OBVIATED WHEN SYSTEM BECOMES FUNCTIONAL
FIOBK Control Block Content
FIOBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure FIOBK FORMATTED I/O BLOCK - INITIALIZATION AND TERMINATION 0000 0 Bitstring 1 FIOCCWOP CCW OP-CODE, CWODRDTA OR CWODWDTA 0001 1 Bitstring 1 FIOFLAG I/O CONDITION FLAG (CC=1) 1... .... FIOSTRFL X'80' I/O STORAGE FAILURE, CANNOT LOAD BLOCK .1.. .... FIOFAIL X'40' I/O FAILURE AFTER 10 ATTEMPTS ..1. .... FIODEVIC X'20' I/0 DEVICE DOES NOT RESPOND ...1 .... FIORANGE X'10' I/O OUTSIDE OF RANGE OF CYLINDERS OR PAGES .... .... FIOSUCES X'00' CC=0 I/O WAS SUCCESSFUL 0002 2 Bitstring 1 FIOWRPFL HCPWRP requesting altnuc I/O flags 1... .... FIOIPLRC X'80' Read IPL rec from vol in FIOASA .1.. .... FIOLODMD X'40' Read HCPLOD from Volume in FIOASA 0003 3 Bitstring 1 * Reserved for future IBM use 0004 4 Signed 4 FIOAREAS Starting cylinder(CKD/ECKD) or page(FBA) number of the area on the volume where I/O can be done 0008 8 Signed 4 FIOAREAL Length in cylinders/pages of the area on the volume where I/O can done 000C 12 Signed 2 FIOPCYLS PAGES PER CYLINDER ON THIS DEVICE 000E 14 Signed 2 FIOPTRKS PAGES PER TRACK ON THIS DEVICE 0010 16 Address 4 FIOPAGAD ADDRESS OF PAGE TO BE READ OR WRITTEN 0014 20 Signed 4 FIOSUBCH SUBCHANNEL NUMBER OF UNIT 0018 24 Signed 4 FIOASA Spooling ASA(CKD-CCPV, FBA-PPPV) 001C 28 Signed 4 FIOBLKNO BLOCK NUMBER WITH 'FILE' 0020 32 Signed 2 FIOLEN LENGTH OF RECORD TO BE READ OR WRITTEN 0022 34 Signed 2 * RESERVED FOR FUTURE IBM USE 00000005 FIOSIZE (*-FIOBK+7)/8 LENGTH OF FORMATTED I/O BLOCK
FIOBK Storage Layout
*** FIOBK - FORMATTED I/O BLOCK * * +------+------+------+------+---------------------------+ * 0 |:CCWOP|:FLAG |:WRPFL|//////| FIOAREAS | * +------+------+------+------+-------------+-------------+ * 8 | FIOAREAL | FIOPCYLS | FIOPTRKS | * +---------------------------+-------------+-------------+ * 10 | FIOPAGAD | FIOSUBCH | * +---------------------------+---------------------------+ * 18 | FIOASA | FIOBLKNO | * +-------------+-------------+---------------------------+ * 20 | FIOLEN |/////////////| 24 * +-------------+-------------+ * *** FIOBK - FORMATTED I/O BLOCK
FIOBK Cross Reference
Symbol Dspl Value -------------- ---- ----- FIOAREAL 0008 FIOAREAS 0004 FIOASA 0018 FIOBLKNO 001C FIOCCWOP 0000 FIODEVIC 0001 20 FIOFAIL 0001 40 FIOFLAG 0001 FIOIPLRC 0002 80 FIOLEN 0020 FIOLODMD 0002 40 FIOPAGAD 0010 FIOPCYLS 000C FIOPTRKS 000E FIORANGE 0001 10 FIOSIZE 0022 00000005 FIOSTRFL 0001 80 FIOSUBCH 0014 FIOSUCES 0001 00 FIOWRPFL 0002
Last updated on 5 Jun 2001 at 13:37:32 EDT.
Copyright IBM Corporation, 1990, 2001