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Inconsistent version and grammar change (#951)

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Earlier in https://github.com/phil-opp/blog_os/blob/master/blog/content/edition-2/posts/02-minimal-rust-kernel/index.md bootloader = "0.9.8" and here we are effectively downgrading to bootloader = "0.9.3" (Maybe there is an earlier feature that has been dropped that I am unaware of.)
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Alexx Roche
2021-03-24 12:48:26 +01:00
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blog/content/edition-2/posts/09-paging-implementation/index.md
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@@ -273,11 +273,11 @@ This means that we need the help of the bootloader, which creates the page table
- The `map_physical_memory` feature maps the complete physical memory somewhere into the virtual address space. Thus, the kernel can access all physical memory and can follow the [_Map the Complete Physical Memory_](#map-the-complete-physical-memory) approach.
- With the `recursive_page_table` feature, the bootloader maps an entry of the level 4 page table recursively. This allows the kernel to access the page tables as described in the [_Recursive Page Tables_](#recursive-page-tables) section.
We choose the first approach for our kernel since it is simple, platform-independent, and more powerful (it also allows to access non-page-table-frames). To enable the required bootloader support, we add the `map_physical_memory` feature to our `bootloader` dependency:
We choose the first approach for our kernel since it is simple, platform-independent, and more powerful (it also allows access to non-page-table-frames). To enable the required bootloader support, we add the `map_physical_memory` feature to our `bootloader` dependency:
```toml
[dependencies]
bootloader = { version = "0.9.3", features = ["map_physical_memory"]}
bootloader = { version = "0.9.8", features = ["map_physical_memory"]}
```
With this feature enabled, the bootloader maps the complete physical memory to some unused virtual address range. To communicate the virtual address range to our kernel, the bootloader passes a _boot information_ structure.