get_user_pages

As we know, the get_user_pages() function is a Linux kernel API. Does FreeBSD have such a kernel API or a similar one?
 
luo said:
vslock() and bus_dmamap_load_uio() can finish the function of get_user_pages().

That still doesn't quite explain what the API does. Can you explain it's function or give some examples?
 
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