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Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
SZREQ
Control Block Contents
SZREQ DSECT
Cross Reference (Contains links to field and bit definitions)
SZREQ Prolog
NAME : HCPSZREQ
DESCRIPTION: SCSI Strategy Call Request Block
DSECT : SZREQ
FUNCTION :
LOCATED BY :
CREATED BY :
DELETED BY :
SERIALIZED :
RELOCATION CONSIDERATIONS : None
NOTES :
This DSECT is a mapping of the blkioReq_iosct structure.
It must match exactly, including offsets up to SZREQEND.
CAUTION: The DIGNUS C compiler aligns all LONG
definitions on 64 bit boundaries. Care must be
taken to account for the alignment in this DSECT.
This is a variable length block. It may or may not
contain a 512-byte temp buffer.
HLA = Host Logical Address
HAA = Host Absolute Address
SZREQ Control Block Content
SZREQ DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SZREQ SCSI Strategy Call Request Block 0000 0 Bitstring 1 SZRFLGU (6) Unused flag bytes 0006 6 Bitstring 1 SZRFLGEX Extended Status flags .... ...1 SZRBASYN X'01' SZRBASYN Don't wait for I/O completion ...1 .... SZRBMORE X'10' SZRBMORE More buffers to be processed .1.. .... SZRBPROT X'40' SZRBPROT Protection violation 1... .... SZRBSPLT X'80' SZRBSPLT Enable split read/write 0007 7 Bitstring 1 SZRFLGST Status flags .... .... SZRBWRIT X'00' SZRBWRIT Non-read flag .... ...1 SZRBREAD X'01' SZRBREAD Read when I/O occurs .... ..1. SZRBDONE X'02' SZRBDONE I/O complete .... .1.. SZRBERR X'04' SZRBERR Error detected .... 1... SZRBBUSY X'08' SZRBBUSY I/O in progress 0008 8 Address 8 * Reserved for SCSI Container use 0010 16 Address 8 * Reserved for SCSI Container use 0018 24 Address 8 SZRFORW (0) 64-bit HLA(next SZREQ) CP only uses 31-bit HLA in SZRFORWL 0018 24 Address 4 SZRFORWH High word of SZRFORW 001C 28 Address 4 SZRFORWL Low word of SZRFORW 0020 32 Address 8 * Reserved for SCSI Container use 0028 40 Address 8 * Reserved for SCSI Container use 0030 48 Address 8 * Reserved for SCSI Container use 0038 56 Address 8 * Reserved for SCSI Container use 0040 64 Dbl-Word 8 SZRBLKNO (0) Block number on device CP only uses 32-bit block numbers 0040 64 Signed 4 SZRBLKNH High word of SZRBLKNO 0044 68 Signed 4 SZRBLKNL Low word of SZRBLKNO 0048 72 Address 8 SZRBUFRA (0) 64-bit HAA(Data buffer) 0048 72 Address 4 SZRBUFRH High word of SZRBUFRA 004C 76 Address 4 SZRBUFRL Low word of SZRBUFRA 0050 80 Dbl-Word 8 SZRBCNT (0) Transfer count in bytes CP only uses 32-bit byte counts 0050 80 Signed 4 SZRBCNTH High word of SZRBCNT 0054 84 Signed 4 SZRBCNTL Low word of SZRBCNT 0058 88 Dbl-Word 8 SZRRESID (0) Bytes not transfered after error CP only uses 32-bit byte counts 0058 88 Signed 4 SZRRSIDH High word of SZRRESID 005C 92 Signed 4 SZRRSIDL Low word of SZRRESID 0060 96 Dbl-Word 8 * Reserved for SCSI Container use 0068 104 Signed 4 * Reserved for SCSI Container use 006C 108 Bitstring 1 SZRERROR Error indicator returned after I/O .... ...1 SZREPERM 1 SZREPERM Operation not permitted .... ..1. SZRENOEN 2 SZRENOEN Operation not permitted .... .1.1 SZREIO 5 SZREIO I/O error .... .11. SZRENXIO 6 SZRENXIO No such device or address .... 1.11 SZREAGAI 11 SZREAGAI Resource temporarily unavailable .... 11.. SZRENOME 12 SZRENOME Not enough space .... 11.1 SZREACCE 13 SZREACCE Permission denied .... 111. SZREFAUL 14 SZREFAUL Bad address ...1 .... SZREBUSY 16 SZREBUSY Resource busy ...1 ...1 SZREEXIS 17 SZREEXIS File exists ...1 ..11 SZRENODE 19 SZRENODE No such device ...1 .11. SZREINVA 22 SZREINVA Invalid argument ..1. ..1. SZRERANG 34 SZRERANG Result too large ..1. 1.1. SZREUNAT 42 SZREUNAT Protocol driver not attached ..1. 111. SZRENOTR 46 SZRENOTR Device not ready ..1. 1111 SZREWRPR 47 SZREWRPR Write-protected media ..11 .... SZREFORM 48 SZREFORM Unformatted media ..11 ...1 SZRENOLC 49 SZRENOLC No locks available ..11 ..1. SZRENOCO 50 SZRENOCO No connection ..11 .1.. SZRESTAL 52 SZRESTAL No filesystem ..11 .111 SZREINPR 55 SZREINPR Operation now in progress .1.. .1.1 SZRENETD 69 SZRENETD Network is down .1.. .11. SZRENETU 70 SZRENETU Network is unreachable .1.. 111. SZRETIME 78 SZRETIME Connection timed out .1.. 1111 SZRECONN 79 SZRECONN Connection refused .11. 111. SZREMEDI 110 SZREMEDI Media surface error .11. 1111 SZRESOFT 111 SZRESOFT I/O completed, but needs relocation .111 .1.. SZREDEAD 116 SZREDEAD Dead Link (FAStT) 1... ...1 SZREPURG 129 SZREPURG I/O purged 006D 109 Bitstring 1 * (3) Padding to match header compile 0070 112 Bitstring 1 * (32) Reserved for SCSI Container use 0090 144 Bitstring 1 * (8) Reserved for SCSI Container use 0098 152 Bitstring 1 * (4) Reserved for SCSI Container use 009C 156 Bitstring 1 * (4) Padding to match header compile **********************************************------ * struct xmem definition * * Structure to hold virtual to real mappings * for pre-translated cross memory descriptors **********************************************------ 00A0 160 Bitstring 32 SZRXMEM (0) xmem descriptor for data buffer 00A0 160 Signed 4 SZRXASI Address space identifier 00FFFF9C SZRXVMTP -100 SZRXVMTP VM TYPE (xmem contains real addrs) 00A4 164 Signed 4 SZRXFLG control flags Start of imbedded V2R mapping structure (xmem_ct) 00A8 168 Signed 4 SZRXTOT length of RPN array (total elements) 00AC 172 Signed 4 SZRXUSD number of rpn elements used 00B0 176 Dbl-Word 8 SZRXVPN virtual page number 00B8 184 Address 8 SZRXRPN (0) HLA(array of real page numbers) 00B8 184 Address 4 SZRXRPNH High word of SZRXRPN 00BC 188 Address 4 SZRXRPNL Low word of SZRXRPN 00C0 192 Bitstring 8 * Reserved for SCSI Container use 00C8 200 Address 8 SZRBEXT (0) 64-bit HLA(Buffer Extension) CP only uses 31-bit HLA in SZRBEXTL 00C8 200 Address 4 SZRBEXTH High word of SZRBEXT 00CC 204 Address 4 SZRBEXTL Low word of SZRBEXT 00D0 208 Bitstring 40 * Reserved for SCSI Container use 00F8 248 Bitstring 16 SZRDVREF IOSC handle for device (devref) 0108 264 Bitstring 16 SZRPSREF PERS handle for device 0118 280 Bitstring 16 SZRIODON Vector for caller's iodone routine 0128 296 Bitstring 16 * Workarea reserved for IOSC 0138 312 Bitstring 16 * Workarea reserved for PERS 0148 328 Bitstring 32 * Reserved for SCSI Container use End of blkioReq_iosct structure architected for z/Series Portable Stack. 0168 360 Signed 2 SZREQEND (0) End of architected request block End of architected structs for z/Series Portable I/O Stack. Remaining data is for CP use only. 0168 360 Bitstring 4 SZRCPEC Eye-catcher for start of CP area 016C 364 Signed 4 SZRADRLN DWORD length of SZRADRLT 0170 368 Address 4 SZRNXTRQ Copy of SZRFORWL for CP use 0174 372 Address 4 SZREDEVA 31-bit HL EDEV address 0178 376 Address 4 SZRADDRS (0) Address area Start of remappable fields **********************************************------ * Mapping for FBA Emulation **********************************************------ 0178 376 Address 4 SZRCPSRC 31-bit HL source address of data to be copied from a temp buffer 0180 384 Address 8 SZRCPTGT 64-bit HA target address of data to be copied from a temp buffer 0188 392 Signed 4 SZRCPLEN Number of bytes to be copied from SZRCPSRC to SZRCPTGT 018C 396 Address 4 * (3) Reserved for IBM use **********************************************------ * Mapping for Native SCSI Paging * Only valid when SZRNATIV flag set. **********************************************------ 0178 376 Address 4 SZRSVRTN 31-bit HLA(SVGBK) to return to caller 017C 380 Address 4 SZRSVPIR 31-bit HLA(PIRBK) to obtain IRA 0180 384 Address 4 SZREXPA 31-bit HLA(EXPBK) Exposure Block addr 0184 388 Address 4 SZRCPEA 31-bit HLA(CPEBK) to return control from the SCSI container 0188 392 Address 4 SZRTIMER TOD at start of I/O 018C 396 Address 4 SZRINTIM TOD at time of interrupt 0190 400 Address 4 SZRNMREQ Count of active SCSI paging requests End of remappable fields 0194 404 Bitstring 1 SZRCPFLG Status flags 1... .... SZRCONTG X'80' SZRCONTG Indicates target address is contiguous with previous request. .1.. .... SZRIDA X'40' SZRIDA Represents an IDA list ..1. .... SZRNATIV X'20' SZRNATIV This block is for a native SCSI I/O (FBA Emulation not used) ...1 .... SZRDONE X'10' SZRDONE HCPSZADN called for this block .... 1... SZRNATER X'08' SZRNATER Native SCSI I/O error occurred (FBA Emulation not used) .... .1.. SZRNPMUL X'04' SZRNPMUL Native SCSI Paging Multi-R/W (FBA Emulation not used) .... ..1. SZRADR X'02' SZRADR This block contains a ADR buffer (mutually exclusive with SZRTBUF) .... ...1 SZRTBUF X'01' SZRTBUF This block contains a temp buffer (mutually exclusive with SZRADR) 0195 405 Bitstring 1 * (3) RESERVED FOR FUTURE IBM USE 0198 408 Address 8 SZRADRLT (0) List of 64-bit HA addresses (entry 1) See SZRADRBX note below. 0198 408 Address 4 SZRADRLH High word of SZRADRLT 019C 412 Address 4 SZRADRLL Low word of SZRADRLT 01A0 416 Character 1 SZRXTND (0) Start of extended data 000001A0 SZRBYSZ *-SZREQ SZREQ byte size 00000034 SZRDWSZ (*-SZREQ+7)/8 SZREQ doubleword size SZREQ containing a ADR List with more than 1 entry. NOTES : The ADR List extension MUST immediately follow SZRADRLT and can extend to the lesser of the max supported by the SCSI container (537 dwords) or the max number of dwords that can be allocatd from a single page with GETST (see FREMX). 01A0 416 Address 8 SZRADRBX (0) Entries 2 through n follow... 000001CA SZRADRMX (FREMX-SZRDWSZ)+1 Max elements in ADR List for non-full page GETST SZREQ containing a 512 byte buffer. 01A0 416 Bitstring 1 SZRTBUFR (512) Buffer for a single 512 byte FBA block space 1 000003A0 SZRBFBSZ *-SZREQ SZREQ byte size with temp buffer 00000074 SZRBFDSZ (*-SZREQ+7)/8 SZREQ dword size w/ temp buffer
SZREQ Storage Layout
*** SZREQ - SCSI Strategy Call Request Block
*
* +-----------------------------------------+------+------+
* 0 | SZRFLGU |:FLGEX|:FLGST|
* +-----------------------------------------+------+------+
* 8 |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 10 |///////////////////////////////////////////////////////|
* +---------------------------+---------------------------+
* 18 | SZRFORWH | SZRFORWL |
* +---------------------------+---------------------------+
* 20 |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 28 |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 30 |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 38 |///////////////////////////////////////////////////////|
* +---------------------------+---------------------------+
* 40 | SZRBLKNH | SZRBLKNL |
* +---------------------------+---------------------------+
* 48 | SZRBUFRH | SZRBUFRL |
* +---------------------------+---------------------------+
* 50 | SZRBCNTH | SZRBCNTL |
* +---------------------------+---------------------------+
* 58 | SZRRSIDH | SZRRSIDL |
* +---------------------------+---------------------------+
* 60 |///////////////////////////////////////////////////////|
* +---------------------------+------+--------------------+
* 68 |///////////////////////////|:ERROR|////////////////////|
* +---------------------------+------+--------------------+
* 70 |///////////////////////////////////////////////////////|
* =///////////////////////////////////////////////////////=
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 90 |///////////////////////////////////////////////////////|
* +---------------------------+---------------------------+
* 98 |///////////////////////////|///////////////////////////|
* +---------------------------+---------------------------+
* A0 | SZRXASI | SZRXFLG |
* +---------------------------+---------------------------+
* A8 | SZRXTOT | SZRXUSD |
* +---------------------------+---------------------------+
* B0 | SZRXVPN |
* +---------------------------+---------------------------+
* B8 | SZRXRPNH | SZRXRPNL |
* +---------------------------+---------------------------+
* C0 |///////////////////////////////////////////////////////|
* +---------------------------+---------------------------+
* C8 | SZRBEXTH | SZRBEXTL |
* +---------------------------+---------------------------+
* D0 |///////////////////////////////////////////////////////|
* =///////////////////////////////////////////////////////=
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* F8 | SZRDVREF |
* | |
* +-------------------------------------------------------+
* 108 | SZRPSREF |
* | |
* +-------------------------------------------------------+
* 118 | SZRIODON |
* | |
* +-------------------------------------------------------+
* 128 |///////////////////////////////////////////////////////|
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 138 |///////////////////////////////////////////////////////|
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 148 |///////////////////////////////////////////////////////|
* =///////////////////////////////////////////////////////=
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
*
*** SZREQ - SCSI Strategy Call Request Block
*** Overlay for SZREQEND in SZREQ
*
* +---------------------------+---------------------------+
* 168 | SZRCPEC | SZRADRLN |
* +---------------------------+---------------------------+
* 170 | SZRNXTRQ | SZREDEVA |
* +---------------------------+---------------------------+
*
*** Overlay for SZREQEND in SZREQ
*** Overlay for SZRADDRS in SZREQ
*
* +---------------------------+---------------------------+
* 178 | SZRCPSRC |///////////////////////////|
* +---------------------------+---------------------------+
* 180 | SZRCPTGT |
* +---------------------------+---------------------------+
* 188 | SZRCPLEN |///////////////////////////|
* +---------------------------+///////////////////////////|
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 198
*
*** Overlay for SZRADDRS in SZREQ
*** Overlay for SZRADDRS in SZREQ
*
* +---------------------------+---------------------------+
* 178 | SZRSVRTN | SZRSVPIR |
* +---------------------------+---------------------------+
* 180 | SZREXPA | SZRCPEA |
* +---------------------------+---------------------------+
* 188 | SZRTIMER | SZRINTIM |
* +---------------------------+------+--------------------+
* 190 | SZRNMREQ |:CPFLG|////////////////////|
* +---------------------------+------+--------------------+
* 198 | SZRADRLH | SZRADRLL |
* +---------------------------+---------------------------+
*
*** Overlay for SZRADDRS in SZREQ
*** Overlay for SZRXTND in SZREQ
*
*
*** Overlay for SZRXTND in SZREQ
*** Overlay for SZRXTND in SZREQ
*
* +-------------------------------------------------------+
* 1A0 | |
* = SZRTBUFR =
* | |
* +-------------------------------------------------------+
* 3A0
*
*** Overlay for SZRXTND in SZREQ
SZREQ Cross Reference
Symbol Dspl Value -------------- ---- ----- SZRADDRS 0178 SZRADR 0194 02 SZRADRBX 01A0 SZRADRLH 0198 SZRADRLL 019C SZRADRLN 016C SZRADRLT 0198 SZRADRMX 01A0 000001CA SZRBASYN 0006 01 SZRBBUSY 0007 08 SZRBCNT 0050 SZRBCNTH 0050 SZRBCNTL 0054 SZRBDONE 0007 02 SZRBERR 0007 04 SZRBEXT 00C8 SZRBEXTH 00C8 SZRBEXTL 00CC SZRBFBSZ 01A0 000003A0 SZRBFDSZ 01A0 00000074 SZRBLKNH 0040 SZRBLKNL 0044 SZRBLKNO 0040 SZRBMORE 0006 10 SZRBPROT 0006 40 SZRBREAD 0007 01 SZRBSPLT 0006 80 SZRBUFRA 0048 SZRBUFRH 0048 SZRBUFRL 004C SZRBWRIT 0007 00 SZRBYSZ 01A0 000001A0 SZRCONTG 0194 80 SZRCPEA 0184 SZRCPEC 0168 SZRCPFLG 0194 SZRCPLEN 0188 SZRCPSRC 0178 SZRCPTGT 0180 SZRDONE 0194 10 SZRDVREF 00F8 SZRDWSZ 01A0 00000034 SZREACCE 006C 0D SZREAGAI 006C 0B SZREBUSY 006C 10 SZRECONN 006C 4F SZREDEAD 006C 74 SZREDEVA 0174 SZREEXIS 006C 11 SZREFAUL 006C 0E SZREFORM 006C 30 SZREINPR 006C 37 SZREINVA 006C 16 SZREIO 006C 05 SZREMEDI 006C 6E SZRENETD 006C 45 SZRENETU 006C 46 SZRENOCO 006C 32 SZRENODE 006C 13 SZRENOEN 006C 02 SZRENOLC 006C 31 SZRENOME 006C 0C SZRENOTR 006C 2E SZRENXIO 006C 06 SZREPERM 006C 01 SZREPURG 006C 81 SZREQEND 0168 SZRERANG 006C 22 SZRERROR 006C SZRESOFT 006C 6F SZRESTAL 006C 34 SZRETIME 006C 4E SZREUNAT 006C 2A SZREWRPR 006C 2F SZREXPA 0180 SZRFLGEX 0006 SZRFLGST 0007 SZRFLGU 0000 SZRFORW 0018 SZRFORWH 0018 SZRFORWL 001C SZRIDA 0194 40 SZRINTIM 018C SZRIODON 0118 SZRNATER 0194 08 SZRNATIV 0194 20 SZRNMREQ 0190 SZRNPMUL 0194 04 SZRNXTRQ 0170 SZRPSREF 0108 SZRRESID 0058 SZRRSIDH 0058 SZRRSIDL 005C SZRSVPIR 017C SZRSVRTN 0178 SZRTBUF 0194 01 SZRTBUFR 01A0 SZRTIMER 0188 SZRXASI 00A0 SZRXFLG 00A4 SZRXMEM 00A0 SZRXRPN 00B8 SZRXRPNH 00B8 SZRXRPNL 00BC SZRXTND 01A0 SZRXTOT 00A8 SZRXUSD 00AC SZRXVMTP 00A0 00FFFF9C SZRXVPN 00B0
Copyright IBM Corporation, 1990, 2011