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Programming Interface Information:
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GCCW
Control Block Contents
GCCW DSECT
Cross Reference (Contains links to field and bit definitions)
GCCW Prolog
NAME : HCPGCCW
DESCRIPTION: GUEST CHANNEL CONTROL WORD MAPPING
DSECT : GCCW
FUNCTION : PROVIDE SYMOLIC REFERENCES FOR THE FIELDS OF A CCW
FOR A VIRTUAL MACHINE
LOCATED BY : N/A
CREATED BY : N/A
DELETED BY : N/A
GCCW Control Block Content
GCCW DSECT
Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure GCCW GUEST CHANNEL CONTROL WORD
MAPPING
0000 0 Dbl-Word 8 GCCWDWRD CCW STRUCTURE
0000 0 Signed 4 GCCW0WD0 (0) FIRST WORD OF CCW
0000 0 Bitstring 1 GCCW0CMD CCW COMMAND CODE
0001 1 Address 3 GCCW0ADR CCW ADDRESS (24-BIT)
0004 4 Signed 4 GCCW0WD1 (0) SECOND WORD OF CCW
0004 4 Bitstring 1 GCCW0FLG CONTROL OF CCW FLAGS
1... .... CCWDC X'80' CHAIN DATA ADDRESS AND
COUNT
.1.. .... CCWCC X'40' COMMAND CHAIN
..1. .... CCWSILI X'20' SUPPRESS INCORRECT LENGTH
...1 .... CCWSKIP X'10' SUPPRESS INBOUND DATA
TRANSFER
.... 1... CCWPCIR X'08' REQUEST PC INTERRUPTION
.... .1.. CCWIDA X'04' INDIRECT DATA ADDRESSING
.... ..11 CCWINVAL X'03' I/O UNDEFINED PAIR OF BITS
.... ..1. CCWSUSPN X'02' I/O SUSPENSION/RESUMPTION
.... ...1 CCWUNDEF X'01' I/O UNDEFINED BIT
0005 5 Bitstring 1 GCCW0SPL FORMAT 0 "UNUSED" BYTE.
0006 6 Signed 2 GCCW0CNT COUNT FOR I/O
0008 8 Dbl-Word 8 GCCW0NXT (0) NEXT GUEST CCW
00000007 GCCW0IS B'0111' INSERT MASK
00000080 GCCW0IDL B'10000000' IDAL INVALID BITS
MASK
00000008 GCCW0LEN 8 LENGTH OF A FORMAT 0 CCW
0000 0 Signed 4 GCCW1WD0 (0) FIRST WORD OF CCW
0000 0 Bitstring 1 GCCW1CMD CCW COMMAND CODE
0001 1 Bitstring 1 GCCW1FLG CONTROL OF CCW FLAGS
1... .... CCWDC X'80' CHAIN DATA ADDRESS AND
COUNT
.1.. .... CCWCC X'40' COMMAND CHAIN
..1. .... CCWSILI X'20' SUPPRESS INCORRECT LENGTH
...1 .... CCWSKIP X'10' SUPPRESS INBOUND DATA
TRANSFER
.... 1... CCWPCIR X'08' REQUEST PC INTERRUPTION
.... .1.. CCWIDA X'04' INDIRECT DATA ADDRESSING
.... ..11 CCWINVAL X'03' I/O UNDEFINED PAIR OF BITS
.... ..1. CCWSUSPN X'02' I/O SUSPENSION/RESUMPTION
.... ...1 CCWUNDEF X'01' I/O UNDEFINED BIT
0002 2 Signed 2 GCCW1CNT COUNT FOR I/O
0004 4 Signed 4 GCCW1WD1 (0) SECOND WORD OF CCW
0004 4 Address 4 GCCW1ADR CCW ADDRESS (31-BIT)
0008 8 Dbl-Word 8 GCCW1NXT (0) NEXT GUEST CCW
0000000F GCCW1IS B'1111' INSERT MASK
00000080 GCCW1IDL B'10000000' IDAL INVALID BIT MASK
00000008 GCCW1LEN 8 LENGTH OF A FORMAT 1 CCW
GCCW Storage Layout
*** GCCW - GUEST CHANNEL CONTROL WORD MAPPING
*
* +-------------------------------------------------------+
* 0 | GCCWDWRD |
* +-------------------------------------------------------+
* 8
*
*** GCCW - GUEST CHANNEL CONTROL WORD MAPPING
*** Overlay for GCCWDWRD in GCCW
*
* +------+--------------------+------+------+-------------+
* 0 |:W0CMD| GCCW0ADR |:W0FLG|:W0SPL| GCCW0CNT |
* +------+--------------------+------+------+-------------+
*
*** Overlay for GCCWDWRD in GCCW
*** Overlay for GCCWDWRD in GCCW
*
* +------+------+-------------+---------------------------+
* 0 |:W1CMD|:W1FLG| GCCW1CNT | GCCW1ADR |
* +------+------+-------------+---------------------------+
*
*** Overlay for GCCWDWRD in GCCW
GCCW Cross Reference
Symbol Dspl Value -------------- ---- ----- CCWCC 0004 40 CCWCC 0001 40 CCWDC 0004 80 CCWDC 0001 80 CCWIDA 0004 04 CCWIDA 0001 04 CCWINVAL 0004 03 CCWINVAL 0001 03 CCWPCIR 0004 08 CCWPCIR 0001 08 CCWSILI 0004 20 CCWSILI 0001 20 CCWSKIP 0004 10 CCWSKIP 0001 10 CCWSUSPN 0004 02 CCWSUSPN 0001 02 CCWUNDEF 0004 01 CCWUNDEF 0001 01 GCCWDWRD 0000 GCCW0ADR 0001 GCCW0CMD 0000 GCCW0CNT 0006 GCCW0FLG 0004 GCCW0IDL 0008 00000080 GCCW0IS 0008 00000007 GCCW0LEN 0008 00000008 GCCW0NXT 0008 GCCW0SPL 0005 GCCW0WD0 0000 GCCW0WD1 0004 GCCW1ADR 0004 GCCW1CMD 0000 GCCW1CNT 0002 GCCW1FLG 0001 GCCW1IDL 0008 00000080 GCCW1IS 0008 0000000F GCCW1LEN 0008 00000008 GCCW1NXT 0008 GCCW1WD0 0000 GCCW1WD1 0004
Last updated on 5 Jun 2001 at 13:50:27 EDT.
Copyright IBM Corporation, 1990, 2001