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Add (buggy) unmap function

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Philipp Oppermann
2015-12-09 01:30:25 +01:00
parent d52c79b106
commit 4fd8891aff
1 changed files with 16 additions and 0 deletions
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16
src/memory/paging/mod.rs
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@@ -126,4 +126,20 @@ impl RecursivePageTable {
let page = Page::containing_address(frame.start_address()); let page = Page::containing_address(frame.start_address());
self.map_to(page, frame, flags, allocator) 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);
}
} }