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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.
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CRm | op2 |
SystemHintOp op; case CRm:op2 of when '0000 000' op = SystemHintOp_NOP; when '0000 001' op = SystemHintOp_YIELD; when '0000 010' op = SystemHintOp_WFE; when '0000 011' op = SystemHintOp_WFI; when '0000 100' op = SystemHintOp_SEV; when '0000 101' op = SystemHintOp_SEVL; when '0000 110' if !HaveDGHExt() then EndOfInstruction(); // Instruction executes as NOP op = SystemHintOp_DGH; when '0000 111' SEE "XPACLRI"; when '0001 xxx' case op2 of when '000' SEE "PACIA1716"; when '010' SEE "PACIB1716"; when '100' SEE "AUTIA1716"; when '110' SEE "AUTIB1716"; otherwise EndOfInstruction(); // Instruction executes as NOP when '0010 000' if !HaveRASExt() then EndOfInstruction(); // Instruction executes as NOP op = SystemHintOp_ESB; when '0010 001' if !HaveStatisticalProfiling() then EndOfInstruction(); // Instruction executes as NOP op = SystemHintOp_PSB; when '0010 010' if !HaveSelfHostedTrace() then EndOfInstruction(); // Instruction executes as NOP op = SystemHintOp_TSB; when '0010 100' op = SystemHintOp_CSDB; when '0011 xxx' case op2 of when '000' SEE "PACIAZ"; when '001' SEE "PACIASP"; when '010' SEE "PACIBZ"; when '011' SEE "PACIBSP"; when '100' SEE "AUTIAZ"; when '101' SEE "AUTHASP"; when '110' SEE "AUTIBZ"; when '111' SEE "AUTIBSP"; when '0100 xx0' op = SystemHintOp_BTI; // Check branch target compatibility between BTI instruction and PSTATE.BTYPE SetBTypeCompatible(BTypeCompatible_BTI(op2<2:1>)); otherwise EndOfInstruction(); // Instruction executes as NOP
case op of
when SystemHintOp_YIELDHint_Yield();
when SystemHintOp_DGHHint_DGH();
when SystemHintOp_WFE
if IsEventRegisterSet() then
ClearEventRegister();
else
trap = FALSE;
if PSTATE.EL == EL0 then
// Check for traps described by the OS which may be EL1 or EL2.
if HaveTWEDExt() then
sctlr = SCTLR[];
trap = sctlr.nTWE == '0';
target_el = EL1;
else
AArch64.CheckForWFxTrap(EL1, TRUE);
if !trap && PSTATE.EL IN {EL0, EL1} && EL2Enabled() && !IsInHost() then
// Check for traps described by the Hypervisor.
if HaveTWEDExt() then
trap = HCR_EL2.TWE == '1';
target_el = EL2;
else
AArch64.CheckForWFxTrap(EL2, TRUE);
if !trap && HaveEL(EL3) && PSTATE.EL != EL3 then
// Check for traps described by the Secure Monitor.
if HaveTWEDExt() then
trap = SCR_EL3.TWE == '1';
target_el = EL3;
else
AArch64.CheckForWFxTrap(EL3, TRUE);
if HaveTWEDExt() && trap && PSTATE.EL != EL3 then
(delay_enabled, delay) = WFETrapDelay(target_el); // (If trap delay is enabled, Delay amount)
if !WaitForEventUntilDelay(delay_enabled, delay) then
// Event did not arrive before delay expired
AArch64.WFxTrap(target_el, TRUE); // Trap WFE
else
WaitForEvent();
when SystemHintOp_WFI
if !InterruptPending() then
if PSTATE.EL == EL0 then
// Check for traps described by the OS which may be EL1 or EL2.
AArch64.CheckForWFxTrap(EL1, FALSE);
if PSTATE.EL IN {EL0, EL1} && EL2Enabled() && !IsInHost() then
// Check for traps described by the Hypervisor.
AArch64.CheckForWFxTrap(EL2, FALSE);
if HaveEL(EL3) && PSTATE.EL != EL3 then
// Check for traps described by the Secure Monitor.
AArch64.CheckForWFxTrap(EL3, FALSE);
WaitForInterrupt();
when SystemHintOp_SEVSendEvent();
when SystemHintOp_SEVLSendEventLocal();
when SystemHintOp_ESBSynchronizeErrors();
AArch64.ESBOperation();
if PSTATE.EL IN {EL0, EL1} && EL2Enabled() then AArch64.vESBOperation();
TakeUnmaskedSErrorInterrupts();
when SystemHintOp_PSBProfilingSynchronizationBarrier();
when SystemHintOp_TSBTraceSynchronizationBarrier();
when SystemHintOp_CSDBConsumptionOfSpeculativeDataBarrier();
when SystemHintOp_BTISetBTypeNext('00');
otherwise // do nothing
case op of when SystemHintOp_YIELDHint_Yield(); when SystemHintOp_DGHHint_DGH(); when SystemHintOp_WFE integer localtimeout = -1; // No local timeout event is generated Hint_WFE(localtimeout); when SystemHintOp_WFI integer localtimeout = -1; // No local timeout event is generated Hint_WFI(localtimeout); when SystemHintOp_SEVSendEvent(); when SystemHintOp_SEVLSendEventLocal(); when SystemHintOp_ESBSynchronizeErrors(); AArch64.ESBOperation(); if PSTATE.EL IN {EL0, EL1} && EL2Enabled() then AArch64.vESBOperation(); TakeUnmaskedSErrorInterrupts(); when SystemHintOp_PSBProfilingSynchronizationBarrier(); when SystemHintOp_TSBTraceSynchronizationBarrier(); when SystemHintOp_CSDBConsumptionOfSpeculativeDataBarrier(); when SystemHintOp_BTISetBTypeNext('00'); otherwise // do nothing
Internal version only: isa v32.12v32.06, AdvSIMD v29.04, pseudocode v2020-09_xmlv2020-06_rel, sve v2020-09_rc3v2020-06_rel0
; Build timestamp: 2020-11-18T172020-07-03T12:2342
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