sevl

Send Event Local (A32)

SEVL

Sends an event locally.

Details

Sends an event signal locally to the current processor only, waking it if it is in the WFE low-power state. Unlike SEV, this does not affect other processors. No register or memory state is changed. No condition flags are affected. This is an A32-only instruction.

Pseudocode Operation

Send event signal to local processor

Example

SEVL

Encoding

Binary Layout
cond
00110
0
10
00
00
1
1
1
1
000000000101
 
Format System Hint
Opcode 0x0320F005
Extension A32 (Base)

Operands

Reference (Arm AArch32 ISA)

Instruction Forms

Encoding Instruction ISA Bit pattern
0x0320F005 SEVL{<c>}{<q>} A32 cond | 00110 | 0 | 10 | 00 | 00 | 1 | 1 | 1 | 1 | 000000000101
0xBF50 SEVL{<c>}{<q>} T32 10111111 | 0101 | 0000
0xF3AF8005 SEVL{<c>}.W T32 111100111010 | 1 | 1 | 1 | 1 | 10 | 0 | 0 | 0 | 000 | 0000 | 0101

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

if ConditionPassed() then
    EncodingSpecificOperations();
    SendEventLocal();