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Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
IOSECT
Control Block Contents
IOSECT DSECT
Cross Reference (Contains links to field and bit definitions)
IOSECT Prolog
Name : IOSECT
Description: I/O Interrupt Save Area
DSECT : IOSECT
Function : IOSECT describes the fields used by DMSITI for
saving registers, the I/O old PSW, and other
data when handling I/O interrupts. IOSECT is
pointed to by the AIOSECT field in NUCON.
IOSECT is mapped by the IOSECT macro.
IOSECT Control Block Content
IOSECT DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure IOSECT I/O Interrupt Save Area 0000 0 Signed 4 IOSAVE (16) Register save area 0040 64 Signed 4 IONTABL Size of user interrupt table in bytes 0044 68 Address 4 AUSRITBL Address of user interrupt table 0048 72 Signed 4 * Length of each entry 004C 76 Address 4 AUSRILST Address of last entry in table 0050 80 Signed 4 OLDEST (4) Oldest I/O old PSW and CSW 0060 96 Signed 4 NEXTO (4) Next oldest I/O old PSW and CSW 0070 112 Signed 4 IOPSW (2) Newest I/O old PSW 0078 120 Signed 4 IOCSW (2) Newest CSW INTBLOK build area 0080 128 Bitstring 1 IOSINTBK (0) Start of INTBLOK build area 0080 128 Bitstring 8 IOSIINFO (0) Interrupt information 0080 128 Signed 4 IOSIPARM For XA/XC, interruption parameter; for 370, 0 0084 132 Bitstring 4 IOSIIDNT (0) For XA/XC, subsystem ID word (SID); for 370, see individual components 0084 132 Signed 2 * For XA/XC, X'0001'; for 370, 0 0086 134 Signed 2 IOSISBDV For XA/XC, subchannel number; for 370, device address 0088 136 Bitstring 8 IOSIBPSW I/O old PSW 0090 144 Bitstring 64 IOSIBIRB (0) For XA/XC, actual interruption response block (IRB); for 370, constructed IRB 0090 144 Bitstring 12 IOSIBCSW (0) For XA/XC, actual subchannel status word (SCSW); for 370, constructed SCSW 0090 144 Bitstring 1 IOSIKSLC Key, S, L, and CC 0091 145 Bitstring 1 * FOR XA/XC, MISCELLANEOUS SCSW BITS; FOR 370, 0 1... .... IOSICCWF X'80' For XA/XC, CCW format; for 370, 0 0092 146 Bitstring 2 * For XA/XC, more miscellaneous SCSW bits; for 370, 0 0094 148 Address 4 IOSIBCCW For XA/XC, CCW address; for 370, X'00' and 3-byte CCW address 0098 152 Bitstring 1 IOSIDVST Device status 0099 153 Bitstring 1 IOSISCST For XA/XC, subchannel status; for 370, channel status 009A 154 Signed 2 IOSIRCNT Residual byte count 009C 156 Signed 4 * (13) For XA/XC, extended status word (ESW) and extended control word (ECW); for 370, 0 00D0 208 Bitstring 1 IOSISTAT Status of INTBLOK information 1... .... IOSIFAIL X'80' For XA/XC, if 1, TSCH failed and IRB is not valid; for 370, always 0 .1.. .... IOSIPSEU X'40' For XA/XC, always 0 (actual information given); for 370, always 1 (constructed, or "pseudo", information given) 00D1 209 Bitstring 1 * Reserved 00D2 210 Signed 2 IOSDEVNM Save device addr for user exit 00000054 IOSIBLEN *-IOSINTBK Length of INTBLOK build area 00D4 212 Bitstring 40 IOSDVBLD Build area for candidate entry 00FC 252 Signed 4 IOSEPSW (2) I/O old PSW for PSW reg setup 0104 260 Signed 4 HOLD Holds entry pointer for device 0108 264 Signed 2 VSTRANGE Unknown device address 010A 266 Bitstring 1 IOSTFLAG I/O status flag 1... .... IOSAMSAV X'80' SLIH invoked with AMODE=31 .1.. .... IOSHDEDH X'40' DMSHDEDH is active ..1. .... IOSABN X'20' DMSABN is active ...1 .... IOSUIO X'10' I/O user routine 010B 267 Bitstring 1 * RESERVED FOR FUTURE USE 010C 268 Address 4 IOSWAITE Address of waiting routine to be invoked after WAITD is issued 0110 272 Signed 4 IOSBASE DMSITI's base register 0114 276 Signed 4 IOSAVE2 (24) Save area used by routines called from DMSITI 0174 372 Bitstring 64 IOAREGS Save area for access registers in XC machine 01B4 436 Signed 4 IOSC14SV Save area for control reg 14 01B8 440 Signed 4 IOSC14WK Work area for control reg 14 01C0 448 Dbl-Word 8 * Reserved for future use
IOSECT Storage Layout
*** IOSECT - I/O Interrupt Save Area
*
* +-------------------------------------------------------+
* 0 | |
* = IOSAVE =
* | |
* +---------------------------+---------------------------+
* 40 | IONTABL | AUSRITBL |
* +---------------------------+---------------------------+
* 48 |///////////////////////////| AUSRILST |
* +---------------------------+---------------------------+
* 50 | OLDEST |
* | |
* +-------------------------------------------------------+
* 60 | NEXTO |
* | |
* +-------------------------------------------------------+
* 70 | IOPSW |
* +-------------------------------------------------------+
* 78 | IOCSW |
* +---------------------------+-------------+-------------+
* 80 | IOSIPARM |/////////////| IOSISBDV |
* +---------------------------+-------------+-------------+
* 88 | IOSIBPSW |
* +------+------+-------------+---------------------------+
* 90 |:IKSLC|//////|/////////////| IOSIBCCW |
* +------+------+-------------+---------------------------+
* 98 |:IDVST|:ISCST| IOSIRCNT |///////////////////////////|
* +------+------+-------------+///////////////////////////|
* A0 |///////////////////////////////////////////////////////|
* =///////////////////////////////////////////////////////=
* |///////////////////////////////////////////////////////|
* +------+------+-------------+---------------------------+
* D0 |:ISTAT|//////| IOSDEVNM | |
* +------+------+-------------+ |
* D8 | |
* = IOSDVBLD =
* | +---------------------------+
* | | IOSEPSW- |
* +---------------------------+---------------------------+
* 100 | -(0FC) | HOLD |
* +-------------+------+------+---------------------------+
* 108 | VSTRANGE |:TFLAG|//////| IOSWAITE |
* +-------------+------+------+---------------------------+
* 110 | IOSBASE | |
* +---------------------------+ |
* 118 | |
* = IOSAVE2 =
* | +---------------------------+
* | | |
* +---------------------------+ |
* 178 | |
* = IOAREGS =
* | +---------------------------+
* 1B0 | | IOSC14SV |
* +---------------------------+---------------------------+
* 1B8 | IOSC14WK |///////////////////////////|
* +---------------------------+---------------------------+
* 1C0 |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 1C8
*
*** IOSECT - I/O Interrupt Save Area
IOSECT Cross Reference
Symbol Dspl Value -------------- ---- ----- AUSRILST 004C AUSRITBL 0044 HOLD 0104 IOAREGS 0174 IOCSW 0078 IONTABL 0040 IOPSW 0070 IOSABN 010A 20 IOSAMSAV 010A 80 IOSAVE 0000 IOSAVE2 0114 IOSBASE 0110 IOSC14SV 01B4 IOSC14WK 01B8 IOSDEVNM 00D2 IOSDVBLD 00D4 IOSEPSW 00FC IOSHDEDH 010A 40 IOSIBCCW 0094 IOSIBCSW 0090 IOSIBIRB 0090 IOSIBLEN 00D2 00000054 IOSIBPSW 0088 IOSICCWF 0091 80 IOSIDVST 0098 IOSIFAIL 00D0 80 IOSIIDNT 0084 IOSIINFO 0080 IOSIKSLC 0090 IOSINTBK 0080 IOSIPARM 0080 IOSIPSEU 00D0 40 IOSIRCNT 009A IOSISBDV 0086 IOSISCST 0099 IOSISTAT 00D0 IOSTFLAG 010A IOSUIO 010A 10 IOSWAITE 010C NEXTO 0060 OLDEST 0050 VSTRANGE 0108
Last updated on 1 May 2002 at 14:21:18 EDT.
Copyright IBM Corporation, 1990, 2002