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fix: typo (#1032)

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2021-07-06 14:29:33 +09:00
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blog/content/edition-2/posts/09-paging-implementation/index.md
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@@ -618,7 +618,7 @@ The traits only define the interface, they don't provide any implementation. The
[`MappedPageTable`]: https://docs.rs/x86_64/0.14.2/x86_64/structures/paging/mapper/struct.MappedPageTable.html
[`RecursivePageTable`]: https://docs.rs/x86_64/0.14.2/x86_64/structures/paging/mapper/struct.RecursivePageTable.html
In our case, the bootloader maps the complete physical memory at a virtual address specfied by the `physical_memory_offset` variable, so we can use the `OffsetPageTable` type. To initialize it, we create a new `init` function in our `memory` module:
In our case, the bootloader maps the complete physical memory at a virtual address specified by the `physical_memory_offset` variable, so we can use the `OffsetPageTable` type. To initialize it, we create a new `init` function in our `memory` module:
```rust
use x86_64::structures::paging::OffsetPageTable;
@@ -781,7 +781,7 @@ The graphic shows the virtual address space on the left, the physical address sp
Additionally, the graphic shows the physical frame of the VGA text buffer in red. Our goal is to map a previously unmapped virtual page to this frame using our `create_example_mapping` function. Since our `EmptyFrameAllocator` always returns `None`, we want to create the mapping so that no additional frames are needed from the allocator. This depends on the virtual page that we select for the mapping.
The graphic shows two canditate pages in the virtual address space, both marked in yellow. One page is at address `0x803fdfd000`, which is 3 pages before the mapped page (in blue). While the level 4 and level 3 page table indices are the same as for the blue page, the level 2 and level 1 indices are different (see the [previous post][page-table-indices]). The different index into the level 2 table means that a different level 1 table is used for this page. Since this level 1 table does not exist yet, we would need to create it if we chose that page for our example mapping, which would require an additional unused physical frame. In contrast, the second candidate page at address `0x803fe02000` does not have this problem because it uses the same level 1 page table than the blue page. Thus, all required page tables already exist.
The graphic shows two candidate pages in the virtual address space, both marked in yellow. One page is at address `0x803fdfd000`, which is 3 pages before the mapped page (in blue). While the level 4 and level 3 page table indices are the same as for the blue page, the level 2 and level 1 indices are different (see the [previous post][page-table-indices]). The different index into the level 2 table means that a different level 1 table is used for this page. Since this level 1 table does not exist yet, we would need to create it if we chose that page for our example mapping, which would require an additional unused physical frame. In contrast, the second candidate page at address `0x803fe02000` does not have this problem because it uses the same level 1 page table than the blue page. Thus, all required page tables already exist.
[page-table-indices]: @/edition-2/posts/08-paging-introduction/index.md#paging-on-x86-64