sevl
Send Event Local (Thumb)
SEVL
Send local event (Thumb).
Details
Send Event Local sets the local event monitor to signaled state, causing any subsequent WFE instruction in the same PE to wake immediately without waiting. This is a Thumb 16-bit instruction that has no effect on condition flags. It is available in ARMv6K and later, and executes in any privilege level.
Pseudocode Operation
EventRegister[PE].LocalEvent ← 1Example
SEVL
Encoding
Binary Layout
10111111
0101
0000
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();