Expand description
Traps EL0 executions of WFI instructions to EL1, from both execution states:
0 Any attempt to execute a WFI instruction at EL0 is trapped EL1, if the instruction would otherwise have caused the PE to enter a low-power state.
1 This control does not cause any instructions to be trapped.
In AArch32 state, the attempted execution of a conditional WFI instruction is only trapped if the instruction passes its condition code check.
Note:
Since a WFE or WFI can complete at any time, even without a Wakeup event, the traps on WFE of WFI are not guaranteed to be taken, even if the WFE or WFI is executed when there is no Wakeup event. The only guarantee is that if the instruction does not complete in finite time in the absence of a Wakeup event, the trap will be taken.
When ARMv8.1-VHE is implemented, and the value of HCR_EL2.{E2H, TGE} is {1, 1}, this bit has no effect on execution at EL0.
Enums
Traps EL0 executions of WFI instructions to EL1, from both execution states: