DEVSECT

Prolog  

Control Block Contents  
   DEVSECT DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

DEVSECT Prolog

 Name       : DEVSECT
 Description: Device Table Entry Mapping
 DSECT      : DEVSECT
 Function   : Describes the device information
              required for input/output routines. DEVSECT is
              a DSECT corresponding to the data in a DEVTAB
              entry.

DEVSECT Control Block Content

DEVSECT DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DEVSECT        Device Table Entry Mapping
0000    0 Signed       2 DEVADDR        - VIRTUAL DEVICE ADDRESS
0002    2 Bitstring    1 DEVFLAG        - D*1 - DEVICE FLAGS
          1... ....      DEVPSDOW       X'80' Pseudo wait bit (from
                                        WAITD)
          .1.. ....      DEVASAP        X'40' HNDINT/HNDIO issued with
                                        ASAP
          ..1. ....      DEVINTR        X'20' Interrupt received for this
                                        entry
          ...1 ....      DEVINTP        X'10' Interrupt processed
          .... 1...      DEVKEEP        X'08' KEEP past end-of-command
          .... .1..      DEVABNKP       X'04' Keep beyond ABEND
                                        processing
          .... ..1.      DEVPERST       X'02' Keep beyond DET/DEF
                                        processing
          .... ...1      DEVAM31        X'01' SLIH invoked as AMODE=31
0002    2 Bitstring    1 DEVCLASS       Device class (DASD only)
0003    3 Bitstring    1 DEVTYPE        Device type code
0004    4 Signed       4 DEVNAME        - SYMBOLIC DEVICE NAME
0008    8 Signed       4 DEVIPRA        - INTERRUPT PROCESSING ROUTINE
                                        ADDRESS
     DEVMISC definitions for tape devices
000C   12 Signed       4 DEVMISC (0)    - MISCELLANEOUS - DEVICE
                                        DEPENDENT
000C   12 Bitstring    1 DEVFMTA        TAPEIO format code last used by
                                        TAPE or VMFPLC2 with this tape
000D   13 Bitstring    1 DEVFMTB        - TAPEIO format code last used
                                        with this tape device. This value
                                        is used in OS simulation
                                        alternate tape switching.
          0000000D       DEVMODE        DEVFMTB,1,C'X' Old name for
                                        DEVFMTB
000E   14 Bitstring    2 DEVSNS (0)     Sense Bytes 0 and 1
000E   14 Bitstring    1 DEVSNS0        from last unit check
000F   15 Bitstring    1 DEVSNS1        from this device
     DEVMISC definitions for disk devices
000C   12 Bitstring    1 DEVDFLAG       DASD flags
          1... ....      DEVDECKD       X'80' ECKD capable hardware
                                        attached
000D   13 Bitstring    1 *              Reserved
000E   14 Bitstring    2 DEVTNUM        Device Type Number, e.g. x'3390'
000C   12 Signed       4 DEVPSW1        First half of saved PSW
0010   16 Dbl-Word     8 DEVCSW         CSW
0018   24 Address      4 DEVUWORD
001C   28 Address      4 DEVIBKAD       Address of INTBLOK
0020   32 Address      4 DEVIBKLN       Length of INTBLOK (bytes)
0024   36 Signed       4 DEVPSW2        Second half of saved PSW
          00000028       DEVSIZE        *-DEVSECT DEVICE TABLE SIZE (IN
                                        BYTES)

DEVSECT Storage Layout

          
*** DEVSECT - Device Table Entry Mapping
*
*     +-------------+------+
*   0 |  DEVADDR    |:FLAG | 3
*     +-------------+------+
*
*** DEVSECT - Device Table Entry Mapping
          
*** Overlay for DEVFLAG in DEVSECT
*
*                   +------+------+---------------------------+
*   0 ...         2 |:CLASS|:TYPE |         DEVNAME           |
*     +-------------+------+------+------+------+------+------+
*   8 |         DEVIPRA           |:FMTA |:FMTB |:SNS0 |:SNS1 |
*     +---------------------------+------+------+------+------+
*  10
*
*** Overlay for DEVFLAG in DEVSECT
          
*** Overlay for DEVMISC in DEVSECT
*
*                                 +------+------+-------------+
*   8 ...                       C |:DFLAG|//////|  DEVTNUM    |
*                                 +------+------+-------------+
*  10
*
*** Overlay for DEVMISC in DEVSECT
          
*** Overlay for DEVMISC in DEVSECT
*
*                                 +---------------------------+
*   8 ...                       C |         DEVPSW1           |
*     +---------------------------+---------------------------+
*  10 |                        DEVCSW                         |
*     +---------------------------+---------------------------+
*  18 |         DEVUWORD          |         DEVIBKAD          |
*     +---------------------------+---------------------------+
*  20 |         DEVIBKLN          |         DEVPSW2           |
*     +---------------------------+---------------------------+
*  28
*
*** Overlay for DEVMISC in DEVSECT

DEVSECT Cross Reference

Symbol         Dspl Value
-------------- ---- -----
DEVABNKP       0002 04
DEVADDR        0000
DEVAM31        0002 01
DEVASAP        0002 40
DEVCLASS       0002
DEVCSW         0010
DEVDECKD       000C 80
DEVDFLAG       000C
DEVFLAG        0002
DEVFMTA        000C
DEVFMTB        000D
DEVIBKAD       001C
DEVIBKLN       0020
DEVINTP        0002 10
DEVINTR        0002 20
DEVIPRA        0008
DEVKEEP        0002 08
DEVMISC        000C
DEVMODE        000D 0000000D
DEVNAME        0004
DEVPERST       0002 02
DEVPSDOW       0002 80
DEVPSW1        000C
DEVPSW2        0024
DEVSIZE        0024 00000028
DEVSNS         000E
DEVSNS0        000E
DEVSNS1        000F
DEVTNUM        000E
DEVTYPE        0003
DEVUWORD       0018