* Mark SPU memory as sleep-blocking.
* Perform 4-byte accesses only in dma_memset() and dma_memcpy() (32-byte
accesses freeze as one would expect).
This change does *NOT* implement support for SPU's integrated DMAC.
This change adds asynchronous capabilities to the DMA API. Previously,
transfers would start asynchronously but could only be completed by a
call to dma_transfer_wait(). The API now supports a callback, as well
as the dma_transfer_sync() variant, to be consistent with the upcoming
USB API that has both _sync and _async versions of functions.
The interrupt handler of the DMA was changed to include a return to
userland, which is required to perform the callback.
* dma_transfer() is now an obsolete synonym for dma_transfer_async()
with no callback.
* dma_transfer_noint() is now a synonym for dma_transfer_atomic(), for
consistency with the upcoming USB API.
Lephe