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Prolog 
Control Block Contents 
   ASA64 DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

 
  ASA64 Control Block Content Top of page
 

 ASA64 DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure ASA64 AUXILIARY STORAGE ADDRESS TABLE ENTRY 0000 0 Dbl-Word 8 ASAGENTR (0) Auxiliary Storage Address 0000 0 Signed 4 ASAGW0 Word 0 of ASA64 0004 4 Signed 4 ASAGW1 Word 1 of ASA64 00000008 ASAGLENT *-ASAGENTR Length of one address table entry 0008 8 Dbl-Word 8 ASAGNEXT (0) Next address table entry 0000 0 Signed 2 ASAGCNUM Auxiliary storage cylinder number 0002 2 Bitstring 1 ASAGPNUM Auxiliary storage page number 0003 3 Bitstring 1 ASAGVOL Auxiliary storage volume code ASA formats: +--+--+--+--+--+--+--+--+ |CC CC PP VV|-- -- -* 00| ECKD/CKD (CCPV) +--+--+--+--+--+--+--+--+ +--+--+--+--+--+--+--+--+ |PP PP PP VV|-- -- -* 00| FBA/SCSI (PPPV) +--+--+--+--+--+--+--+--+ 0000 0 Bitstring 4 * Bits 0-31 of ASA 0004 4 Bitstring 2 * Bits 32-47 of ASA 0006 6 Bitstring 1 ASAFLAGS protect bits when PTRM PTE contains 2nd ASA for paged 8K PGMBK (to keep consistent formats for both ASAs) 0007 7 Bitstring 1 ASAtype ASA type .... .... ASAtCCPV X'00' ASAtCCPV ASA is 32-bit CCPV ECKD ASA, or ASA is 32-bit PPPV FBA ASA in bits 00-31 (ASAGW0) only. ASAGW1 should be all zeros.
 
 
  ASA64 Storage Layout Top of page
 
          
*** ASA64 - AUXILIARY STORAGE ADDRESS TABLE ENTRY
*
*     +---------------------------+---------------------------+
*   0 |          ASAGW0           |          ASAGW1           |
*     +---------------------------+---------------------------+
*
*** ASA64 - AUXILIARY STORAGE ADDRESS TABLE ENTRY
          
*** Overlay for ASAGW0 in ASA64
*
*     +-------------+------+------+
*   0 |  ASAGCNUM   |:GPNUM|:GVOL | 4
*     +-------------+------+------+
*
*** Overlay for ASAGW0 in ASA64
          
*** Overlay for ASAGENTR in ASA64
*
*     +---------------------------+-------------+------+------+
*   0 |///////////////////////////|/////////////|:FLAGS|:TYPE |
*     +---------------------------+-------------+------+------+
*   8
*
*** Overlay for ASAGENTR in ASA64
 
 
  ASA64 Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
ASAtype        0007
ASAtCCPV       0007 00
ASAFLAGS       0006
ASAGCNUM       0000
ASAGENTR       0000
ASAGLENT       0004 00000008
ASAGNEXT       0008
ASAGPNUM       0002
ASAGVOL        0003
ASAGW0         0000
ASAGW1         0004
 
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:56:22 EDT.
Copyright IBM Corporation, 1990, 2013