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Jeremy Soller 2016-09-29 15:02:05 -06:00
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# kernel # kernel
A collaborative effort to rewrite the kernel with focus on correctness and code quality. A collaborative effort to rewrite the kernel with focus on correctness and code
quality.
## Why? ## Why?
The kernel code was getting increasingly messy to the point where only the original writer would be able to find and fix bugs. Fortunately, the kernel of Redox is relatively small and such a project is estimated to take only a few months. The kernel code was getting increasingly messy to the point where only the
original writer would be able to find and fix bugs. Fortunately, the kernel of
Redox is relatively small and such a project is estimated to take only a few
months.
## What? ## What?
The aims of the new kernel should be clear in their order: The aims of the new kernel should be clear in their order:
1. **Correctness**: Above anything else, the kernel should be correct. No hacks, despite how the tiny cool shortcuts might seem, it gives severe backslash later on. Keep it correct and well-written. 1. **Correctness**: Above anything else, the kernel should be correct. No hacks,
despite how the tiny cool shortcuts might seem, it gives severe backslash later
on. Keep it correct and well-written.
2. **Readability and documentation**: The code quality should be high, with that follows a detailed documentation, including both API docs (on every item!) and careful comments for anything non-trivial. 2. **Readability and documentation**: The code quality should be high, with that
follows a detailed documentation, including both API docs (on every item!) and
careful comments for anything non-trivial.
3. **Performance**: If you can, go for it. 3. **Performance**: If you can, go for it.
@ -20,7 +28,9 @@ The aims of the new kernel should be clear in their order:
### A rotten house is built on a rotten fundament. ### A rotten house is built on a rotten fundament.
Don't fool yourself. You are likely not getting back to the ugly code. Write it the right way **first time**, and make sure you only move on **when it's done right**. Don't fool yourself. You are likely not getting back to the ugly code. Write it
the right way **first time**, and make sure you only move on when it's
**done right**.
### Comments ### Comments
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### Debug assertions ### Debug assertions
Abusing debug assertions is a wonderful way to catch bugs, and it is very much encouraged. Abusing debug assertions is a wonderful way to catch bugs, and it is very much
encouraged.
### Statical checking ### Statical checking
Rust provides a lot of type-system features which can be used to create wonderful safe abstractions, and you should use them whenever you get the chance. Rust provides a lot of type-system features which can be used to create
wonderful safe abstractions, and you should use them whenever you get the chance.
Unsafety should be avoided, and if it is triggered only under some addition **insert an assertion**. Despite this being a kernel, we prefer kernel panics over security vulnerabilities. Unsafety should be avoided, and if it is triggered only under some addition
**insert an assertion**. Despite this being a kernel, we prefer kernel panics
over security vulnerabilities.
If the condition is (or should be) unreachable, but if not upheld, leading to UB, put an assertion in the start of the function. If the condition is (or should be) unreachable, but if not upheld, leading to
UB, put an assertion in the start of the function.
### Be gentle ### Be gentle
Don't just write as much code as you can as quick as possible. Take your time and be careful. Don't just write as much code as you can as quick as possible. Take your time
and be careful.
### Commits ### Commits
Use descriptive commits. One way to force yourself to do that is to not pass the `-m` flag, which will make your editor pop up, so that you can conviniently write long commit messages. Use descriptive commits. One way to force yourself to do that is to not pass the
`-m` flag, which will make your editor pop up, so that you can conviniently
write long commit messages.