Mark Cave-Ayland b87b0644bc apb: add IOMMU flush register implementation
The IOMMU flush register is a write-only register used to remove entries from the
hardware TLB. Allow guest writes to this register as a no-op, and return a value
of 0 for reads.

This fixes IOMMU DMA operations under NetBSD SPARC64.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
2014-08-17 13:13:01 +01:00
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