IHCBLCK MICBLOK contains pointers to control registers, the segment table, and other values
required by the virtual machine assist feature and the VM/370 Extended Control-Program Support (ECPS). This information is needed for the handling of certain instructions and privileged operations requested by the virtual machine. The VMMICRO field of the VMBLCK points to MICBLOK. o MICRSEG 8 MICVPSW 10 MICVTMR Hexadecimal Field
Displacement Name
o
4
8
8
9
C 10 14
14 MICRSEG DS MICCREG DS MICVPSW DS ORG l'IICVIP DS MICWORK MICVTMR MICACF DS DS DS DS ORG MICEVl'IA DS !!i!§ MICLPSW EQU MICPTLB EQU MICSCSP EQU l'IICSIO EQU l'IICSTSM EQU IHCSTPT EQU l'IICTCH EQU 1F
1F
1F MICVPSW 1X 3X 1F
1F
1F MICACF 1X in MICEVl'IA --X'80'-- X'40' X'20' X'10' X'08' X'04' X'02' IHCCREG MICWORK MICACF Field Description, Contents, Meaning Real segment table pointer Virtual control register pointer Virtual PSW pointer Virtual interrupt pending bit Virtual interrupt
virtual machine
handle change
external mask
All other bits
is pending; therefore, the
assist feature is net to
of PSW channel masks or
from disabled to enabled.
in this byte must be O. Address of virtual PSW Workspace pointer
Location to be decremented when
interval timer assist feature ECPS is being used
Assist controls
the virtual
of VM/370 Expanded virtual machine assist control bits LPSW simulation PTLE simulation SCKC, SPT simulation SIO simulation STNSM, STOSM. and SSM simulation STPT simulation TCH simulation
15 DS 3X Reserved for IBM Use l'IICSIZE EQU (*-MICBLOK)/8 Size of tSECT in doutlewords (X'03') Section 1. CP Data Areas and Control Blocks 39

MIHREC MIHREC is used in the SVC 76-initiated error recording process of tYFe 70 MIH (Missing Interrupt Handler) records. I 0 MIHKElN I 1*1 I/A*2//I/A*3//I/l*4//I///MIHSPE1////1 8 MIHDTEN 10 18 20 MIHCUl2 28 MIHVOL 30 Hexadecimal Field
Displacement Name o
2
3
4
5
6
8
C 10 MIHKElN MIHSiS1 MIHSiS2 MI!I$WS3 MIHRECNT MIHSPE1 MIHDTEN MIHTMEN MIHCPID DS DS DS DS DS DS DS DS DS (cont. )
1H
1C
1C
1C
1C
1H
1F
1F
2F Qatg 18 20 23
26
2C 30 MIHJOB MlijCUl2 MIHCUl1 IHHYOL IUHDEYT MIHINT IHHSIZE DS 8X DS 3X DS 3X DS 61 DS 41 DS 8X EQU (*-MIHREC) MIHTMEN MIHCPID MIHJOB MIHCUl1 MIHVOL MIHINT 1*1 1*2 1*3 1*4 IHBDEVT Field Description, Contents, Meaning Type and operating system Switch byte 0 Reserved for IBM use
Reserved for IBM use
Reserved for IBM use
Reserved for IBM use
Date Time Processor identification and model number Job whose I/O request is pending CUI used to address the device Primary device address Volume serial number of device
Device type Time interval used to check Fending interrupt MIH record size in deublewcrds (X'07') 40 IBM VM/370 Data lreas and Centrol Block Logic