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. |
HCCW
Cross Reference (Contains links to field and bit definitions)
HCCW Prolog
NAME : HCPHCCW DESCRIPTION: HOST CHANNEL CONTROL WORD DSECT : HCCW FUNCTION : PROVIDE SYMOLIC REFERENCES FOR THE FIELDS OF THE FORMAT ONE CCWS USED BY CP LOCATED BY : N/A CREATED BY : N/A DELETED BY : N/A
HCCW Control Block Content
HCCW DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure HCCW HOST CHANNEL CONTROL WORD 0000 0 Dbl-Word 8 HCCW1 (0) AN ENTIRE FORMAT 1 CCW 0000 0 Signed 4 HCCWCFCT (0) Format 1 CCW first word - cmd, flag, and count 0000 0 Bitstring 1 HCCWCMND CCW COMMAND CODE 0001 1 Bitstring 1 HCCWFLAG CCW FLAG BITS 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 HCCWCNT CCW DATA COUNT 0004 4 Address 4 HCCWADDR CCW DATA ADDRESS 00000007 HCCWADRX *-1 CCW FINAL BYTE OF ADDRESS 0008 8 Dbl-Word 8 HCCWNEXT (0) CCW FOLLOWING CURRENT CCW 0000000F HCCWIS B'1111' ICM/STCM MASK FOR 31 BIT ADDRESS 00000004 HCCWMC 04 MVC/CLC LENGTH FOR 31 BIT ADDRESS 00000080 HCCWIDAL B'10000000' IDAL INVALID BIT MASK 00000008 HCCWLEN 8 LENGTH OF A SINGLE CCW (8 BYTES)
HCCW Storage Layout
*** HCCW - HOST CHANNEL CONTROL WORD * * +------+------+-------------+---------------------------+ * 0 |:WCMND|:WFLAG| HCCWCNT | HCCWADDR | * +------+------+-------------+---------------------------+ * 8 | | * = HCCWNEXT = * | | * +-------------------------------------------------------+ * *** HCCW - HOST CHANNEL CONTROL WORD
HCCW Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----CCWCC 0001 40
CCWDC 0001 80
CCWIDA 0001 04
CCWINVAL 0001 03
CCWPCIR 0001 08
CCWSILI 0001 20
CCWSKIP 0001 10
CCWSUSPN 0001 02
CCWUNDEF 0001 01
HCCWADDR 0004
HCCWADRX 0004 00000007
HCCWCFCT 0000
HCCWCMND 0000
HCCWCNT 0002
HCCWFLAG 0001
HCCWIDAL 0008 00000080
HCCWIS 0008 0000000F
HCCWLEN 0008 00000008
HCCWMC 0008 00000004
HCCWNEXT 0008
HCCW1 0000
Last updated on 3 Aug 1999 at 12:04:34 EDT.
Copyright IBM Corporation, 1990, 1999