stop

Stop

stop

Stops instruction execution and enters a power-saving state (replaces nap/doze on P9+).

Encoding

Binary Layout

19

0:5

/

6:10

/

11:15

/

16:20

722

21:30

/

31

 

Format X-form

Opcode 0x4C0002E4

Extension Privileged

Operands

Registers Altered

PSSCR

Related

More in Privileged

Reference

View in PowerISA v3.1C Specification ↗ OPF Power ISA v3.1C

Description

The thread is placed into power-saving mode and execution is stopped. The power-saving level that is entered is determined by the contents of the PSSCR. The thread remains in power-saving mode until either a System Reset exception or certain other events occur.

Operation

PSSCR ← (PSSCR & ~0x3F) | power-saving-level
stop

Programming Note

This instruction should not be executed in ultravisor state because that scenario may not be thoroughly verified. This instruction is privileged and context synchronizing.