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Wait For Event is a hint instruction that indicates that the PE can enter a low-power state and remain there until a wakeup event occurs. Wakeup events include the event signaled as a result of executing the SEV instruction on any PE in the multiprocessor system. For more information, see Wait For Event and Send Event.
As described in Wait For Event and Send Event, the execution of a WFE instruction that would otherwise cause entry to a low-power state can be trapped to a higher Exception level, see:
It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 and T2 ) .
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 | 0 | 1 | 0 | |||
cond |
// No additional decoding required
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 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
// No additional decoding required
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 | 0 | 1 | 0 |
WFE{<c>}.W
// No additional decoding required
For more information about the constrained unpredictable behavior of this instruction, see Architectural Constraints on UNPREDICTABLE behaviors.
if ConditionPassed() then
EncodingSpecificOperations();
if IsEventRegisterSet() then
ClearEventRegister();
else
if PSTATE.EL == EL0 then
// Check for traps described by the OS which may be EL1 or EL2.
AArch32.CheckForWFxTrap(EL1, TRUE);
if PSTATE.EL IN { ifEL2Enabled() && PSTATE.EL IN {EL0, EL1} && EL2Enabled() && !} && !IsInHost() then
// Check for traps described by the Hypervisor.
AArch32.CheckForWFxTrap(EL2, TRUE);
if HaveEL(EL3) && PSTATE.M != M32_Monitor then
// Check for traps described by the Secure Monitor.
AArch32.CheckForWFxTrap(EL3, TRUE);
WaitForEvent();
Internal version only: isa v00_96v00_88, pseudocode r8p5_00bet2_rc5v85-xml-00bet9_rc1_1
; Build timestamp: 2019-03-28T072018-12-12T12:5933
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This document is Non-Confidential.
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