Csrr1 - Critical Save/Restore Register 1 - IBM A2 User Manual

14.5.10 CSRR1 - Critical Save/Restore Register 1

Register Short Name:
Decimal SPR Number:
Initial Value:
Slow SPR:
Guest Supervisor Mapping:
Bits Field Name
32 CM
33:34 ///
35 GS
36 ///
37 UCLE
38 SPV
39:45 ///
46 CE
47 ///
48 EE
49 PR
50 FP
Version 1.3
October 23, 2012
CSRR1
59
0x0000000000000000
N
Initial
Value
0b0 Computation Mode
0 The processor runs in 32-bit mode.
1 The processor runs in 64-bit mode.
0b00 Reserved
0b0 Guest State
0 The processor is in hypervisor state if MSR[PR] = 0.
1 The processor is in guest state.
0b0 Reserved
0b0 User Cache Locking Enable
0 Cache locking instructions are privileged.
1 Cache locking instructions can be executed in user mode (MSR[PR] = 1).
0b0 Vector Available
0 The processor cannot execute any vector instruction.
1 The processor can execute vector instructions.
0x0 Reserved
0b0 Critical Enable
0 Critical input, watchdog timer, and processor doorbell critical interrupts are dis-
abled.
1 Critical input, watchdog timer, and processor doorbell critical interrupts are
enabled.
0b0 Reserved
0b0 External Enable
0 External input, decrementer, fixed-interval timer, processor doorbell, guest proces-
sor doorbell, and performance monitor interrupts are disabled.
1 External input, decrementer, fixed-interval timer, processor doorbell, guest proces-
sor doorbell, and performance monitor interrupts are enabled.
When an interrupt masked by MSR[EE] is directed to the hypervisor state, the interrupt is
enabled if MSR[EE] = 1 or MSR[GS] = 1 except for the guest processor doorbell, which is
enabled if MSR[EE] = 1 and MSR[GS] = 1.
When an interrupt masked by MSR[EE] is directed to the guest state, the interrupt is
enabled if MSR[EE] = 1 and MSR[GS] = 1.
0b0 Problem State
0 The processor is in supervisor mode; it can execute any instruction and can
access any resource (that is, GPRs, SPRs, MSR, and so forth).
1 The processor is in user mode; it cannot execute any privileged instruction and
cannot access any privileged resource.
0b0 Floating-Point Available
0 The processor cannot execute any floating-point instructions, including floating-
point loads, stores, and moves.
1 The processor can execute floating-point instructions.
Read Access:
Write Access:
Duplicated for Multithread:
Notes:
Scan Ring:
Description
User's Manual
A2 Processor
Hypv
Hypv
Y
AM
func
Alphabetical Register Listing
Page 551 of 897