WFI

Wait for Interrupt

WFI

Provides a hint to the implementation that the current hart can be stalled until an interrupt occurs.

Encoding

Binary Layout

00010000010100000000000001110011

31:0

 

Format R-Type (System)

Opcode 0x10500073

Extension Privileged

Operands

Related

More in Privileged

Reference

View in RISC-V Unprivileged ISA Specification ↗ RISC-V ISA Manual

Description

WFI (Wait For Interrupt) provides a hint to the implementation that the current hart can be stalled until an interrupt might need servicing. Implementations may simply implement WFI as NOP.

Operation

while(!Interrupt) { /* low power state */ }