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Add an (unfinished) unmap method

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Philipp Oppermann
2017-04-13 19:24:20 +02:00
parent 3696c7bacb
commit 15c9f43622
1 changed files with 16 additions and 0 deletions
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16
src/memory/paging/mod.rs
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@@ -134,4 +134,20 @@ impl ActivePageTable {
let page = Page::containing_address(frame.start_address());
self.map_to(page, frame, flags, allocator)
}
fn unmap<A>(&mut self, page: Page, allocator: &mut A)
where A: FrameAllocator
{
assert!(self.translate(page.start_address()).is_some());
let p1 = self.p4_mut()
.next_table_mut(page.p4_index())
.and_then(|p3| p3.next_table_mut(page.p3_index()))
.and_then(|p2| p2.next_table_mut(page.p2_index()))
.expect("mapping code does not support huge pages");
let frame = p1[page.p1_index()].pointed_frame().unwrap();
p1[page.p1_index()].set_unused();
// TODO free p(1,2,3) table if empty
allocator.deallocate_frame(frame);
}
}