IBM: CHRBK

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.

CHRBK

Prolog

Control Block Contents

CHRBK DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

CHRBK Prolog

 NAME       : HCPCHRBK
 DESCRIPTION: DEVICE / SUBCHANNEL INDEX STRUCTURE
 DSECT      : CHRBK
 FUNCTION   : THE DEVICE / SUBCHANNEL RADIX TREE BLOCK IS USED
              TO REPRESENT THE DEVICE BLOCK INDEX STRUCTURE
 LOCATED BY : HCPRIOIX CONTAINS THE RADIX TREE FOR THE REAL
              DEVICE NUMBERS WHICH ADDRESSES THE CHRBK FOR
              THE FIRST DIGIT OF THE DEVICE NUMBER.
 CREATED BY : CHRBK'S ARE DYNAMICALLY CREATED BY CALLING
              HCPFREE
 DELETED BY : CHRBK'S ARE DELETED BY CALLING HCPFRET
 COMMENTS   : NONE

CHRBK Control Block Content


CHRBK DSECT
Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CHRBK          DEVICE / SUBCHANNEL INDEX
                                        STRUCTURE
0000    0 Signed       4 CHRINDX0       INDEX FOR DIGIT 0 MOD 16
0004    4 Signed       4 CHRINDX1       INDEX FOR DIGIT 1 MOD 16
0008    8 Signed       4 CHRINDX2       INDEX FOR DIGIT 2 MOD 16
000C   12 Signed       4 CHRINDX3       INDEX FOR DIGIT 3 MOD 16
0010   16 Signed       4 CHRINDX4       INDEX FOR DIGIT 4 MOD 16
0014   20 Signed       4 CHRINDX5       INDEX FOR DIGIT 5 MOD 16
0018   24 Signed       4 CHRINDX6       INDEX FOR DIGIT 6 MOD 16
001C   28 Signed       4 CHRINDX7       INDEX FOR DIGIT 7 MOD 16
0020   32 Signed       4 CHRINDX8       INDEX FOR DIGIT 8 MOD 16
0024   36 Signed       4 CHRINDX9       INDEX FOR DIGIT 9 MOD 16
0028   40 Signed       4 CHRINDXA       INDEX FOR DIGIT A MOD 16
002C   44 Signed       4 CHRINDXB       INDEX FOR DIGIT B MOD 16
0030   48 Signed       4 CHRINDXC       INDEX FOR DIGIT C MOD 16
0034   52 Signed       4 CHRINDXD       INDEX FOR DIGIT D MOD 16
0038   56 Signed       4 CHRINDXE       INDEX FOR DIGIT E MOD 16
003C   60 Signed       4 CHRINDXF       INDEX FOR DIGIT F MOD 16
          0000003C       CHROMASK       CHRINDXF-CHRINDX0 MASK TO ISOLATE
                                        THE OFFSET TO INDX0-INDXF
          00000008       CHRSIZE        (*-CHRBK+7)/8 SIZE OF BLOCK IN
                                        DBW'S

CHRBK Storage Layout

*** CHRBK - DEVICE / SUBCHANNEL INDEX STRUCTURE
*
*     +---------------------------+---------------------------+
*   0 |         CHRINDX0          |         CHRINDX1          |
*     +---------------------------+---------------------------+
*   8 |         CHRINDX2          |         CHRINDX3          |
*     +---------------------------+---------------------------+
*  10 |         CHRINDX4          |         CHRINDX5          |
*     +---------------------------+---------------------------+
*  18 |         CHRINDX6          |         CHRINDX7          |
*     +---------------------------+---------------------------+
*  20 |         CHRINDX8          |         CHRINDX9          |
*     +---------------------------+---------------------------+
*  28 |         CHRINDXA          |         CHRINDXB          |
*     +---------------------------+---------------------------+
*  30 |         CHRINDXC          |         CHRINDXD          |
*     +---------------------------+---------------------------+
*  38 |         CHRINDXE          |         CHRINDXF          |
*     +---------------------------+---------------------------+
*  40
*
*** CHRBK - DEVICE / SUBCHANNEL INDEX STRUCTURE