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Update blog to e272cc9257

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travis-update-bot
2015-12-10 16:01:40 +00:00
parent 4461e9c3c7
commit a605b9f822
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_posts/2015-12-09-modifying-page-tables.md
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@@ -296,12 +296,12 @@ To convert the address into references, we add two functions:
```rust ```rust
pub fn next_table(&self, index: usize) -> Option<&Table> { pub fn next_table(&self, index: usize) -> Option<&Table> {
self.next_table_address(index) self.next_table_address(index)
.map(|t| unsafe { &*(t as *const _) }) .map(|address| unsafe { &*(address as *const _) })
} }
pub fn next_table_mut(&mut self, index: usize) -> Option<&mut Table> { pub fn next_table_mut(&mut self, index: usize) -> Option<&mut Table> {
self.next_table_address(index) self.next_table_address(index)
.map(|t| unsafe { &mut *(t as *mut _) }) .map(|address| unsafe { &mut *(address as *mut _) })
} }
``` ```
We convert the address into raw pointers and then convert them into references in `unsafe` blocks. Now we can start at the `P4` constant and use these functions to access the lower tables. And we don't even need `unsafe` blocks to do it! We convert the address into raw pointers and then convert them into references in `unsafe` blocks. Now we can start at the `P4` constant and use these functions to access the lower tables. And we don't even need `unsafe` blocks to do it!