Programming Interface Information: This information is NOT intended to be
used as Programming Interfaces of z/VM.

CCWTT

Prolog  

Control Block Contents  
   CCWTT DSECT
   CCWTTE DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  


CCWTT Prolog

 NAME       : HCPCCWTT
 DESCRIPTION: Channel Program Translation Tables
 DSECT      : CCWTT
 FUNCTION   : Address translation table used by the CCW
              Translation function.
 LOCATED BY : CPTTRTBL (data area in CPTCA)
              CCW_TRANS_TBL_NEXT
 CREATED BY : HCPCCWTA Macro
 DELETED BY : HCPUNTFR
 SERIALIZED : BEING ACCESSED FOR A UNIQUE TASK
 REFERENCES : None
 COMMENTS   : The first table is contained in the
              CPTCA.  Additional tables will be built
              as required.  Note, for most cases we
              expect to only need one table.
              The translation table is basically an
              array of addresses and some flags as
              follows.
              If the address being used is 64 bit then
              virt_addr1 and virt_addr2 contain the
              high and low order address words.  If the
              address is 31 bits then the address is
              only contained in virt_addr2.

 

CCWTT Control Block Content


CCWTT DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CCWTT          Channel Program Translation
                                        Tables
0000    0 Bitstring    1 CCW_TRANS_TBL (0)
                                        Translation table entries
0000    0 Bitstring  160 CCW_TRANS_TBL_ENTRIES
00A0  160 Signed       4 CCW_TRANS_TBL_NEXT
                                        Next translation table
          00000015       CCWSIZE        (*-CCWTT+7)/8 DW size of table
     The following DSECT defines each translation table entry

CCWTTE DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CCWTTE         Channel Program Translation
                                        Tables
0000    0 Dbl-Word     8 CCW_TRANS_TBL_64ADR (0)
                                        64 bit virtual address
0000    0 Signed       4 CCW_TRANS_TBL_VHI
                                        Hi order word 64 bit addr
0004    4 Signed       4 CCW_TRANS_TBL_VADDR
                                        Virtual page address or lo order
                                        word 64 bit addr
0008    8 Signed       4 CCW_TRANS_TBL_RADDR
                                        Real page address
000C   12 Bitstring    1 CCW_TRANS_TBL_FLAGS
                                        Address translation flags
          1... ....      CCW_TRANS_TBL_USED
                                        X'80' Entry in use
          .1.. ....      CCW_TRANS_TBL_CKF
                                        X'40' Checked FETCH protection
          ..1. ....      CCW_TRANS_TBL_CKS
                                        X'20' Checked STORE protection
          ...1 ....      CCW_TRANS_TBL_FETCH
                                        X'10' FETCH allowed
          .... 1...      CCW_TRANS_TBL_STORE
                                        X'08' STORE allowed
000D   13 Bitstring    3 *              Reserved for future use
          00000010       CCWEL          *-CCWTTE
          0000000A       CCW_TRANS_TBL_ENTRY_NBR
                                        10 Number of table entries
          0000000A       CCWNE          CCW_TRANS_TBL_ENTRY_NBR

 

CCWTT Storage Layout

          
*** CCWTT - Channel Program Translation Tables
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                CCW_TRANS_TBL_ENTRIES                  =
*     |                                                       |
*     +---------------------------+---------------------------+
*  A0 |    CCW_TRANS_TBL_NEXT     | A4
*     +---------------------------+
*
*** CCWTT - Channel Program Translation Tables
          
*** CCWTTE - Channel Program Translation Tables
*
*     +---------------------------+---------------------------+
*   0 |    CCW_TRANS_TBL_VHI      |   CCW_TRANS_TBL_VADDR     |
*     +---------------------------+------+--------------------+
*   8 |   CCW_TRANS_TBL_RADDR     |(00C) |////////////////////|
*     +---------------------------+------+--------------------+
*  10
*
*** CCWTTE - Channel Program Translation Tables

 

CCWTT Cross Reference

Symbol         Dspl Value
-------------- ---- -----
CCW_TRANS_TBL  0000
CCW_TRANS_TBL_CKF
               000C 40
CCW_TRANS_TBL_CKS
               000C 20
CCW_TRANS_TBL_ENTRIES
               0000
CCW_TRANS_TBL_ENTRY_NBR
               000D 0000000A
CCW_TRANS_TBL_FLAGS
               000C
CCW_TRANS_TBL_FETCH
               000C 10
CCW_TRANS_TBL_NEXT
               00A0
CCW_TRANS_TBL_RADDR
               0008
CCW_TRANS_TBL_STORE
               000C 08
CCW_TRANS_TBL_USED
               000C 80
CCW_TRANS_TBL_VHI
               0000
CCW_TRANS_TBL_VADDR
               0004
CCW_TRANS_TBL_64ADR
               0000
CCWEL          000D 00000010
CCWNE          000D 0000000A
CCWSIZE        00A0 00000015

This information is based on z/VM V4R1.0.
Last updated on 5 Jun 2001 at 13:01:44 EDT.
Copyright IBM Corporation, 1990, 2001