sevl

Send Event Local

SEVL

Sends an event locally to the executing processor.

Details

Sends an event signal locally to only the executing processor core, setting its local event flag so that the next WFE will not block. No condition flags are affected. Execution state: AArch64-only.

Pseudocode Operation

# Set local event flag
LOCAL_EVENT_FLAG ← 1
PC ← PC + 4

Example

SEVL

Encoding

Binary Layout

11010101000000110010

0000

101

11111

Format System Alias

Opcode 0xD50320BF

Extension Base

Operands

Reference (Arm A64 ISA)

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD50320BF	SEVL		A64		11010101000000110010 \| 0000 \| 101 \| 11111

Description

Send Event Local is a hint instruction that causes an event to be signaled locally without requiring the event to be signaled to other PEs in the multiprocessor system. It can prime a wait-loop which starts with a WFE instruction.

Operation

SendEventLocal();