sev
Send Event (Thumb)
SEV
Send event (Thumb).
Details
Send Event sets the event register and wakes all processors in the same inner-shareable domain that are waiting on WFE. This is used for synchronization between multiple CPUs or threads. No registers or condition flags are modified. SEV is available in all privilege levels.
Pseudocode Operation
EventRegister ← 1
WakeupInnerShareableDomain()Example
SEV
Encoding
Binary Layout
10111111
0100
0000
Operands
Reference (Arm AArch32 ISA)
Instruction Forms
| Encoding | Instruction | ISA | Bit pattern | ||
|---|---|---|---|---|---|
| 0x0320F004 | SEV{<c>}{<q>} | A32 | cond | 00110 | 0 | 10 | 00 | 00 | 1 | 1 | 1 | 1 | 000000000100 | ||
| 0xBF40 | SEV{<c>}{<q>} | T32 | 10111111 | 0100 | 0000 | ||
| 0xF3AF8004 | SEV{<c>}.W | T32 | 111100111010 | 1 | 1 | 1 | 1 | 10 | 0 | 0 | 0 | 000 | 0000 | 0100 |
Description
Send Event is a hint instruction. It causes an event to be signaled to all PEs in the multiprocessor system. For more information, see Wait For Event and Send Event.
Operation
if ConditionPassed() then
EncodingSpecificOperations();
SendEvent();