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Fix HierachicalLevel typo

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Rafal Mielniczuk
2015-12-20 14:37:54 +00:00
committed by Philipp Oppermann
parent 74e84c7ea4
commit 337799599a
2 changed files with 16 additions and 16 deletions
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22
posts/2015-12-09-modifying-page-tables.md
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@@ -340,14 +340,14 @@ impl TableLevel for Level1 {}
```
An empty enum has size zero and disappears completely after compiling. Unlike an empty struct, it's not possible to instantiate an empty enum. Since we will use `TableLevel` and `Level4` in exported types, they need to be public as well.
To differentiate the P1 table from the other tables, we introduce a `HierachicalLevel` trait, which is a subtrait of `TableLevel`. But we implement it only for the levels 4, 3, and 2:
To differentiate the P1 table from the other tables, we introduce a `HierarchicalLevel` trait, which is a subtrait of `TableLevel`. But we implement it only for the levels 4, 3, and 2:
```rust
trait HierachicalLevel: TableLevel {}
trait HierarchicalLevel: TableLevel {}
impl HierachicalLevel for Level4 {}
impl HierachicalLevel for Level3 {}
impl HierachicalLevel for Level2 {}
impl HierarchicalLevel for Level4 {}
impl HierarchicalLevel for Level3 {}
impl HierarchicalLevel for Level2 {}
```
Now we add the level parameter to the `Table` type:
@@ -374,7 +374,7 @@ impl<L> Table<L> where L: TableLevel
pub fn zero(&mut self) {...}
}
impl<L> Table<L> where L: HierachicalLevel
impl<L> Table<L> where L: HierarchicalLevel
{
pub fn next_table(&self, index: usize) -> Option<&Table<???>> {...}
@@ -391,22 +391,22 @@ Now the `next_table` methods are only available for P4, P3, and P2 tables. But t
For a P4 table we would like to return a `Table<Level3>`, for a P3 table a `Table<Level2>`, and for a P2 table a `Table<Level1>`. So we want to return a table of the _next level_.
We can define the next level by adding an associated type to the `HierachicalLevel` trait:
We can define the next level by adding an associated type to the `HierarchicalLevel` trait:
```rust
trait HierachicalLevel: TableLevel {
trait HierarchicalLevel: TableLevel {
type NextLevel: TableLevel;
}
impl HierachicalLevel for Level4 {
impl HierarchicalLevel for Level4 {
type NextLevel = Level3;
}
impl HierachicalLevel for Level3 {
impl HierarchicalLevel for Level3 {
type NextLevel = Level2;
}
impl HierachicalLevel for Level2 {
impl HierarchicalLevel for Level2 {
type NextLevel = Level1;
}
```

10
src/memory/paging/table.rs
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@@ -20,7 +20,7 @@ impl<L> Table<L> where L: TableLevel
}
}
impl<L> Table<L> where L: HierachicalLevel
impl<L> Table<L> where L: HierarchicalLevel
{
fn next_table_address(&self, index: usize) -> Option<usize> {
let entry_flags = self[index].flags();
@@ -87,18 +87,18 @@ impl TableLevel for Level3 {}
impl TableLevel for Level2 {}
impl TableLevel for Level1 {}
trait HierachicalLevel: TableLevel {
trait HierarchicalLevel: TableLevel {
type NextLevel: TableLevel;
}
impl HierachicalLevel for Level4 {
impl HierarchicalLevel for Level4 {
type NextLevel = Level3;
}
impl HierachicalLevel for Level3 {
impl HierarchicalLevel for Level3 {
type NextLevel = Level2;
}
impl HierachicalLevel for Level2 {
impl HierarchicalLevel for Level2 {
type NextLevel = Level1;
}