SEV -- AArch32

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SEV -- AArch32

SEV

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.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 and T2 ) .

A1

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
!= 1111				0	0	1	1	0	0	1	0	0	0	0	0	(1)	(1)	(1)	(1)	(0)	(0)	(0)	(0)	0	0	0	0	0	1	0	0
cond									R			imm4								imm12

Encoding

SEV{<c>}{<q>}

Decode for this encoding

// No additional decoding required

T1

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	0	1	1	1	1	1	1	0	1	0	0	0	0	0	0
								hint

Encoding

SEV{<c>}{<q>}

Decode for this encoding

// No additional decoding required

T2

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	1	1	1	0	0	1	1	1	0	1	0	(1)	(1)	(1)	(1)	1	0	(0)	0	(0)	0	0	0	0	0	0	0	0	1	0	0
																								hint				option

Encoding

SEV{<c>}.W

Decode for this encoding

// No additional decoding required

For more information about the CONSTRAINED UNPREDICTABLE behavior of this instruction, see Architectural Constraints on UNPREDICTABLE behaviors.

Assembler Symbols

<c>	See Standard assembler syntax fields.

<q>	See Standard assembler syntax fields.

Operation

if ConditionPassed() then EncodingSpecificOperations(); SendEvent(); end;

2025-09_rel_asl1 2026-03-12 12:57:38