CSEEBFBK Back to Index page
 
Prolog 
Control Block Contents 
   CSEEBFBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  CSEEBFBK Prolog Top of page
 
 NAME       : CSEEBFBK
 DESCRIPTION: CSL buffer block for ECKD devices
 DSECT      : CSEEBFBK
 FUNCTION   : To provide an area to hold variables, link
              records and CCW strings when creating, checking,
              or changing Cross System Link information on
              an ECKD device.
 LOCATED BY : N/A
 CREATED BY : HCPXXLIN, HCPXLECL, HCPXLEDE, HCPXLEDI
 DELETED BY : HCPXXLIN, HCPXLECL, HCPXLEDE, HCPXLEDI
 SERIALIZED : N/A
 RELOCATION CONSIDERATIONS : None
 
 
  CSEEBFBK Control Block Content Top of page
 

 CSEEBFBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure CSEEBFBK CSL buffer block for ECKD devices 0000 0 Signed 4 ISFER0 (16) Register save area 0040 64 Bitstring 1 ISFECC (2) CC of CSE header record 0042 66 Bitstring 1 ISFEHH (2) HH of CSE header record 0044 68 Bitstring 1 ISFERFLG I*1 ECKD read link flag 0045 69 Bitstring 1 ISFEWFLG I*2 ECKD write link flag 0046 70 Bitstring 1 ISFENFLG I*3 ECKD no link flag 0047 71 Bitstring 1 ISFELNK I*4 Contents of link flag 0048 72 Bitstring 1 ISFESYS# I*5 System number 0049 73 Bitstring 1 ISFELROP I*6 Locate Record op code 004A 74 Bitstring 1 ISFEFLAG I*7 Flag byte 004B 75 Bitstring 1 * Reserved for future use 004C 76 Bitstring 1 ISFESRFL Stable Read link flag 004D 77 Bitstring 1 ISFESWFL Stable Write link flag 004E 78 Bitstring 1 ISFEXRFL Exclusive Read link flag 004F 79 Bitstring 1 ISFEXWFL Exclusive Write link flag 0050 80 Signed 2 ISFEDISP Location of flag byte in link record 0052 82 Bitstring 1 * (6) Reserved for future use 0058 88 Signed 2 ISFETCYL Num cyls formatted for CSE 005A 90 Signed 2 ISFERECS Num systems with link info 005C 92 Signed 2 ISFENTRK Num tracks used for CSE info 005E 94 Signed 2 ISFEICYL Num of cylinders with link information on one record 0060 96 Signed 2 ISFERCSZ Length of record on 1 track 0062 98 Signed 2 ISFECYL Cyl num of specific cylinder 0064 100 Signed 2 ISFETRK Track num of specific cyl 0066 102 Signed 2 ISFEOFF Offset into link record 0068 104 Character 56 ISFEHDR CSE ECKD header record 00A0 160 Signed 4 ISFEBUFA (56) Host logical pointers to ECKD buffers. 0180 384 Signed 4 ISFECCWS Host logical address of CCW area. 0184 388 Signed 2 ISFEBFSZ Length of XXL buffer area 0186 390 Signed 2 ISFECCSZ Length of CCW area 0188 392 Signed 4 ISFEDAT Host logical address of buffer for LR and DE data 018C 396 Signed 4 ISFEZERO Host logical address of zero buffer Variables relating to links found on other systems. 0190 400 Signed 2 ISFERD Number of read links 0192 402 Signed 2 ISFEWR Number of write links 0194 404 Signed 2 ISFESR Number of SR links 0196 406 Signed 2 ISFERX Index to READ system 0198 408 Signed 2 ISFEWX Index to WRITE system 019A 410 Signed 2 ISFESRX Index to system w/ SR link 019C 412 Signed 2 ISFESWX Index to system w/ SW link 019E 414 Signed 2 ISFEEX Index to system w/ E link 00000010 ISFXSIZE *-ISFERD Size of count/index fields 01A0 416 Signed 4 ISFEFLG Host logical address of link flag 01A4 420 Signed 4 ISFESYS Host logical address of link record 00000035 ISFESIZE (((*-CSEEBFBK)+7)/8) CSEEBFBK size in DWs 000001A8 ISFEBFLN *-CSEEBFBK CSEEBFBK size in bytes 1... .... SYSERROR X'80' # systems > # records .1.. .... FNDEXW X'40' EW link on other system ..1. .... FNDEXR X'20' ER link on other system ...1 .... FNDESW X'10' SW link on other system
 
 
  CSEEBFBK Storage Layout Top of page
 
          
*** CSEEBFBK - CSL buffer block for ECKD devices
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                        ISFER0                         =
*     |                                                       |
*     +-------------+-------------+------+------+------+------+
*  40 |   ISFECC    |   ISFEHH    |:ERFLG|:EWFLG|:ENFLG|:ELNK |
*     +------+------+------+------+------+------+------+------+
*  48 |:ESYS#|:ELROP|:EFLAG|//////|:ESRFL|:ESWFL|:EXRFL|:EXWFL|
*     +------+------+------+------+------+------+------+------+
*  50 |  ISFEDISP   |/////////////////////////////////////////|
*     +-------------+-------------+-------------+-------------+
*  58 |  ISFETCYL   |  ISFERECS   |  ISFENTRK   |  ISFEICYL   |
*     +-------------+-------------+-------------+-------------+
*  60 |  ISFERCSZ   |  ISFECYL    |  ISFETRK    |  ISFEOFF    |
*     +-------------+-------------+-------------+-------------+
*  68 |                                                       |
*     =                       ISFEHDR                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  A0 |                                                       |
*     =                       ISFEBUFA                        =
*     |                                                       |
*     +---------------------------+-------------+-------------+
* 180 |         ISFECCWS          |  ISFEBFSZ   |  ISFECCSZ   |
*     +---------------------------+-------------+-------------+
* 188 |         ISFEDAT           |         ISFEZERO          |
*     +-------------+-------------+-------------+-------------+
* 190 |   ISFERD    |   ISFEWR    |   ISFESR    |   ISFERX    |
*     +-------------+-------------+-------------+-------------+
* 198 |   ISFEWX    |  ISFESRX    |  ISFESWX    |   ISFEEX    |
*     +-------------+-------------+-------------+-------------+
* 1A0 |         ISFEFLG           |         ISFESYS           |
*     +---------------------------+---------------------------+
* 1A8
*
*** CSEEBFBK - CSL buffer block for ECKD devices
 
 
  CSEEBFBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
FNDESW         01A4 10
FNDEXR         01A4 20
FNDEXW         01A4 40
ISFEBFLN       01A4 000001A8
ISFEBFSZ       0184
ISFEBUFA       00A0
ISFECC         0040
ISFECCSZ       0186
ISFECCWS       0180
ISFECYL        0062
ISFEDAT        0188
ISFEDISP       0050
ISFEEX         019E
ISFEFLAG       004A
ISFEFLG        01A0
ISFEHDR        0068
ISFEHH         0042
ISFEICYL       005E
ISFELNK        0047
ISFELROP       0049
ISFENFLG       0046
ISFENTRK       005C
ISFEOFF        0066
ISFERCSZ       0060
ISFERD         0190
ISFERECS       005A
ISFERFLG       0044
ISFERX         0196
ISFER0         0000
ISFESIZE       01A4 00000035
ISFESR         0194
ISFESRFL       004C
ISFESRX        019A
ISFESWFL       004D
ISFESWX        019C
ISFESYS        01A4
ISFESYS#       0048
ISFETCYL       0058
ISFETRK        0064
ISFEWFLG       0045
ISFEWR         0192
ISFEWX         0198
ISFEXRFL       004E
ISFEXWFL       004F
ISFEZERO       018C
ISFXSIZE       019E 00000010
SYSERROR       01A4 80
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:46:39 EDT.
Copyright IBM Corporation, 1990, 2022