MIHDR Back to Index page
 
Prolog 
Control Block Contents 
   MIHDR 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.


  MIHDR Prolog Top of page
 
 NAME       : HCPMIHDR
 DESCRIPTION: MISSING INTERRUPT HANDLER HEADER BLOCK
 DSECT      : MIHDR
 FUNCTION   : THE MIHDR CONTAINS THE GENERAL INFORMATION THAT
              PERTAINS TO THE HANDLING OF MISSING INTERRUPT
              CONDITIONS.  IN ADDITION, IT ACTS AS THE ANCHOR
              FOR THE CHAIN OF HCPMIOBJS.
 LOCATED BY :
              IORMIPTR FIELD OF IORBK - BLOCKS USED FOR HANDLING MISSING
              INTERRUPT CONDITIONS
 CREATED BY : MIHDR'S ARE DYNAMICALLY CREATED BY HCPMHLAT.
 DELETED BY : MIHDR'S ARE DELETED BY HCPMHLDT WHEN THERE ARE NO MORE
              MIOBJ'S ASSOCIATED WITH THE MIHDR.
 RELOCATION CONSIDERATIONS : None
 
 
  MIHDR Control Block Content Top of page
 

 MIHDR DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure MIHDR MISSING INTERRUPT HANDLER HEADER BLOCK 0000 0 Signed 4 MIRTRYCT RETRY COUNT 0004 4 Address 4 MIOBJPTR ADDRESS OF FIRST MIOBJ IN CHAIN 0008 8 Address 4 MIORGIRA THE ORIGINAL IRA VALUE 000C 12 Address 4 * Reserved for Future IBM use 0010 16 Address 4 MIORGPIO ORIGINAL IORPIOR VALUE 0014 20 Bitstring 1 MICSCH MI on CSCH recovery counter 0015 21 Bitstring 1 MIHFLAG MIH Control Flag 1... .... MIHPEND X'80' MIHPEND Notification task is currently Queued 0016 22 Bitstring 1 * (2) Reserved for future IBM use 00000003 MIHDSIZE (*-MIHDR+7)/8 MIHDR SIZE IN DOUBLE-WORDS
 
 
  MIHDR Storage Layout Top of page
 
          
*** MIHDR - MISSING INTERRUPT HANDLER HEADER BLOCK
*
*     +---------------------------+---------------------------+
*   0 |         MIRTRYCT          |         MIOBJPTR          |
*     +---------------------------+---------------------------+
*   8 |         MIORGIRA          |///////////////////////////|
*     +---------------------------+------+------+-------------+
*  10 |         MIORGPIO          |MICSCH|:FLAG |/////////////|
*     +---------------------------+------+------+-------------+
*  18
*
*** MIHDR - MISSING INTERRUPT HANDLER HEADER BLOCK
 
 
  MIHDR Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
MICSCH         0014
MIHDSIZE       0016 00000003
MIHFLAG        0015
MIHPEND        0015 80
MIOBJPTR       0004
MIORGIRA       0008
MIORGPIO       0010
MIRTRYCT       0000
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:29:10 EDT.
Copyright IBM Corporation, 1990, 2020