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Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM. |
CCWTT
Control Block Contents
CCWTT DSECT
CCWTTE DSECT
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