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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. |
S0CCW
Cross Reference (Contains links to field and bit definitions)
S0CCW Prolog
NAME : HCPS0CCW
DESCRIPTION: SPOOLing Format 0 Channel Control
Word Pairs
DSECT : S0CCW
FUNCTION : Provide symbolic references for the fields of
the format 0 (370) CCW pairs used by spooling
in the spool files. The format 0 CCW is used
when working with VM/SP spool files. This
definition corresponds to the VM/SP CCW pair
usage.
LOCATED BY : N/A
CREATED BY : N/A
DELETED BY : N/A
S0CCW Control Block Content
S0CCW DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure S0CCW SPOOLing Format 0 Channel Control 0000 0 Bitstring 12 S0CCWPAR (0) FORMAT 0 (System 370 CCW Pair) 0000 0 Signed 4 S0CCWWD0 (0) First word of CCW pair 0000 0 Bitstring 1 S0CCWCMD CCW command code 0001 1 Address 3 S0CCWADR CCW address (24-BIT) 0004 4 Signed 4 S0CCWWD1 (0) Second word of CCW pair 0004 4 Bitstring 1 S0CCWFLG 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 S0CCWUN FORMAT 0 "UNUSED" byte. 0006 6 Signed 2 S0CCWCNT Count for I/O 00000008 S0CCWSLN (*-S0CCW) Length of a FORMAT 0 CCW if the SKIP bit is set. (No TIC) 0008 8 Signed 4 S0CCWWD2 (0) Third word of CCW pair 0008 8 Bitstring 1 S0CCWTCC TIC CCW command code 0009 9 Address 3 S0CCWTCA TIC CCW address (24-BIT) 000C 12 Signed 2 S0CCWDAT (0) Start of variable length data 0000000C S0CCWLEN (*-S0CCW) Length of a FORMAT 0 CCW pair in bytes S0CCWOL is a 2 byte field used to contain the original data length for CCWs which have had blanks compressed from the data. This field is nonexistent for CCWs in which compression does not occur. The exception is TAG processing which always has the original data length appended to the end of the tag data field. S0CCWOL is located following the data. However, direct addressability cannot be achieved due to the preceding variable length data field. 000C 12 Bitstring 2 S0CCWOL Value of the original data length 00000010 S0CCWTAG (((S0CCWLEN+L'S0CCWOL+7)/8)*8) Length to add to the tag for the CCW and the original data length. Doubleword alignment is guaranteed through this computation. 00000007 S0CCWIS B'0111' Insert mask for 24-bit addresses
S0CCW Storage Layout
*** S0CCW - SPOOLing Format 0 Channel Control * * +------+--------------------+------+------+-------------+ * 0 |:CWCMD| S0CCWADR |:CWFLG|:CWUN | S0CCWCNT | * +------+--------------------+------+------+-------------+ * 8 |:CWTCC| S0CCWTCA | S0CCWOL | E * +------+--------------------+-------------+ * *** S0CCW - SPOOLing Format 0 Channel Control
S0CCW Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----CCWCC 0004 40
CCWDC 0004 80
CCWIDA 0004 04
CCWINVAL 0004 03
CCWPCIR 0004 08
CCWSILI 0004 20
CCWSKIP 0004 10
CCWSUSPN 0004 02
CCWUNDEF 0004 01
S0CCWADR 0001
S0CCWCMD 0000
S0CCWCNT 0006
S0CCWDAT 000C
S0CCWFLG 0004
S0CCWIS 000C 00000007
S0CCWLEN 000C 0000000C
S0CCWOL 000C
S0CCWPAR 0000
S0CCWSLN 0006 00000008
S0CCWTAG 000C 00000010
S0CCWTCA 0009
S0CCWTCC 0008
S0CCWUN 0005
S0CCWWD0 0000
S0CCWWD1 0004
S0CCWWD2 0008
Last updated on 3 Aug 1999 at 12:38:46 EDT.
Copyright IBM Corporation, 1990, 1999