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RFC: New bus_space routine: bus_space_sync
For prefetchable regions (like framebuffers) mapped by bus_space_map, there is
a need to able force the contents out of the cache back into memory (especially
when the cache is a writeback cache).
There is no MI way to do this with the bus_space framework so I'm proposing we
void bus_space_sync(bus_space_tag_t bst,
where ops is one of:
#define BUS_SPACE_SYNC_WB 1 // defined by MD
#define BUS_SPACE_SYNC_WBINV 2 // defined by MD
One caveat is that though a BUS_SPACE_SYNC_WB was requested, a platform can
perform BUS_SPACE_SYNC_WBINV instead. If the platform can't support just
writeback, it is allowed to silently do a writeback-invalidate instead.
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