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Fix minor typo on cpu-exceptions page (#495)

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Will Gulian
2018-11-04 08:55:25 -05:00
committed by Philipp Oppermann
parent 68f8d238d8
commit 24c6a85f18
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blog/content/second-edition/posts/06-cpu-exceptions/index.md
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@@ -486,7 +486,7 @@ extern "x86-interrupt" fn breakpoint_handler(
For space reasons we don't show the full content here. You can find the full file [on Github](https://github.com/phil-opp/blog_os/blob/master/src/bin/test-exception-breakpoint.rs).
It is similar to our `main.rs`, but uses a custom IDT called `TEST_IDT` and different `_start` and `breakpoint_handler` functions. The most interesting part is the `BREAKPOINT_HANDLER_CALLER` static. It is an [`AtomicUsize`], an integer type that can be safely concurrently modified because all of its operations are atomic. We increment it when the `breakpoint_handler` is called and verify in our `_start` function that the handler was called exactly once.
It is similar to our `main.rs`, but uses a custom IDT called `TEST_IDT` and different `_start` and `breakpoint_handler` functions. The most interesting part is the `BREAKPOINT_HANDLER_CALLED` static. It is an [`AtomicUsize`], an integer type that can be safely concurrently modified because all of its operations are atomic. We increment it when the `breakpoint_handler` is called and verify in our `_start` function that the handler was called exactly once.
[`AtomicUsize`]: https://doc.rust-lang.org/core/sync/atomic/struct.AtomicUsize.html