Gsrr0 - Guest Save/Restore Register 0 - IBM A2 User Manual

User's Manual
A2 Processor

14.5.40 GSRR0 - Guest Save/Restore Register 0

Register Short Name:
Decimal SPR Number:
Initial Value:
Slow SPR:
Guest Supervisor Mapping:
Bits Field Name
0:61 GSRR0
62:63 ///
Alphabetical Register Listing
Page 590 of 897
GSRR0
378
0x0000000000000000
N
Y
Initial
Value
0x0 Guest Save/Restore Register 0
This register is used to save the machine state on interrupts directed to the guest state and
to restore the machine state when an rfgi is executed. When an interrupt is taken, the
GSRR0 is set to the current or next instruction address. When rfgi is executed, instruction
execution continues at the address in GSRR0. In general, GSRR0 contains the address of
the instruction that caused the interrupt or the address of the instruction to return to after a
critical interrupt is serviced.
0b00 Reserved
Read Access:
Write Access:
Duplicated for Multithread:
Notes:
Scan Ring:
Description
Priv
Priv
Y
HM
func
Version 1.3
October 23, 2012