RingContext
RingContext *ctxDesc;
offset = adapter->ctxDesc_physAddr + sizeof (RingContext);
(void) ddi_dma_sync(adapter->ctxDesc_dma_handle, sizeof (RingContext),
(void) ddi_dma_sync(adapter->ctxDesc_dma_handle, sizeof (RingContext),
size = (sizeof (RingContext) + sizeof (uint32_t));
(void) memset(addr, 0, sizeof (RingContext));
adapter->ctxDesc = (RingContext *) addr;
adapter->ctxDesc_physAddr + sizeof (RingContext);
(uint32_t *)(uintptr_t)(((char *)addr) + sizeof (RingContext));