To allocate the Event queue, ensure that your software performs the following steps:

Procedure

1. Allocate memory for the Event queue.
2. Configure the Event queue size and base address by writing to the SMMU_EVENTQ_BASE register.

   Note:

   The queue size can affect how many bits of the SMMU_EVENTQ_CONS and SMMU_EVENTQ_PROD indices are writeable. It is therefore important that you perform this step before writing to SMMU_EVENTQ_CONS and SMMU_EVENTQ_PROD.
3. Set the queue read index in SMMU_EVENTQ_CONS and the queue write index in SMMU_EVENTQ_PROD to 0.

   Note:

   Setting the queue read index and the queue write index to the same value indicates that the queue is empty.