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The x86_64 crate requires no unsafe for tlb flushing

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Philipp Oppermann
2017-04-13 19:43:38 +02:00
parent 9f0995c4b7
commit 493dede919
1 changed files with 8 additions and 8 deletions
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16
blog/content/post/06-page-tables.md
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@@ -855,14 +855,14 @@ x86_64 = "0.1.2"
```rust
...
p1[page.p1_index()].set_unused();
unsafe {
use x86_64::instructions::tlb;
use x86_64::VirtualAddress;
tlb::flush(VirtualAddress(page.start_address()));
}
// TODO free p(1,2,3) table if empty
//allocator.deallocate_frame(frame);
p1[page.p1_index()].set_unused();
use x86_64::instructions::tlb;
use x86_64::VirtualAddress;
tlb::flush(VirtualAddress(page.start_address()));
// TODO free p(1,2,3) table if empty
//allocator.deallocate_frame(frame);
}
```
Now the desired page fault occurs even when we access the page before.