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rmfree() releases space back into a resource map. It is the opposite of rmalloc(9F), which allocates space that is controlled by a resource map structure.
When releasing resources using rmfree() the size and index passed to rmfree() must exactly match the size and index values passed to and returned from a previous call to rmalloc(). Resources cannot be returned piecemeal.
Drivers may define resource maps for resource allocation, in terms of arbitrary units, using the rmallocmap(9F) function. The system maintains the resource map structure by size
and index, computed in units appropriate for the resource. For example, units may be byte addresses, pages of memory, or blocks. rmfree() frees up unallocated space for re-use.
rmfree() can also be used to initialize a resouce map, in which case the size and index should cover the entire resource area.
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