Writing an OS in Rust
This blog series creates a small operating system in the Rust programming language. Each post is a small tutorial and includes all needed code.
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Latest posts
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Updates in March 2020
This post gives an overview of the recent updates to the Writing an OS in Rust blog and the corresponding libraries and tools. I focused my time this month on finishing the long-planned post about Async/Await . In addition to that, there were a few updates to the crates behind…
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Async/Await
In this post, we explore cooperative multitasking and the async/await feature of Rust. We take a detailed look at how async/await works in Rust, including the design of the Future trait, the state machine transformation, and pinning . We then add basic support for async/await to…
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Updates in February 2020
This post gives an overview of the recent updates to the Writing an OS in Rust blog and the corresponding libraries and tools. blog_os The repository of the Writing an OS in Rust blog received the following updates: Mention potential bump allocator extensions Don’t panic on…
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Updates in January 2020
This post gives an overview of the recent updates to the Writing an OS in Rust blog and the corresponding libraries and tools. blog_os The repository of the Writing an OS in Rust blog received the following updates: Move #[global_allocator] into allocator module Update…
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Allocator Designs
This post explains how to implement heap allocators from scratch. It presents and discusses different allocator designs, including bump allocation, linked list allocation, and fixed-size block allocation. For each of the three designs, we will create a basic implementation that…
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Updates in December 2019
Happy New Year! This post gives an overview of the recent updates to the Writing an OS in Rust blog and the corresponding libraries and tools. blog_os The repository of the Writing an OS in Rust blog received the following updates: Update x86_64 dependency to version 0.8.1. This…
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Updates in October and November 2019
This post gives an overview of the recent updates to the Writing an OS in Rust blog and the used libraries and tools. I moved to a new apartment mid-October and had lots of work to do there, so I didn’t have the time for creating the October status update post. Therefore, this…
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Updates in September 2019
This post gives an overview of the recent updates to the Writing an OS in Rust blog and the used libraries and tools. I finished my master thesis and got my degree this month, so I only had limited time for my open source work. I still managed to perform a few minor updates,…
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Updates in August 2019
This post gives an overview of the recent updates to the Writing an OS in Rust blog and the used libraries and tools. I was very busy with finishing my master’s thesis, so I didn’t have any to implement any notable changes myself. Thanks to contributions by @vinaychandra and @64…
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Updates in July 2019
This post gives an overview of the recent updates to the Writing an OS in Rust blog and the used libraries and tools. Since I’m still very busy with my master thesis, I haven’t had the time to work on a new post. But there were quite a few maintenance updates this month and also…
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Updates in June 2019
This post gives an overview of the recent updates to the Writing an OS in Rust blog and the used libraries and tools. My focus this month was to finish the Heap Allocation post, on which I had been working since March. I originally wanted to include a section about different…
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Heap Allocation
This post adds support for heap allocation to our kernel. First, it gives an introduction to dynamic memory and shows how the borrow checker prevents common allocation errors. It then implements the basic allocation interface of Rust, creates a heap memory region, and sets up an…
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Updates in May 2019
This post gives an overview of the recent updates to the Writing an OS in Rust blog and to the used tools. I was quite busy with my master thesis this month, so I didn’t have the time to create new content or major new features. However, there were quite a few minor updates.…
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Updates in April 2019
Lot’s of things changed in the Writing an OS in Rust series in the past month, both on the blog itself and in the tools behind the scenes. This post gives an overview of the most important updates. This post is an experiment inspired by This Week in Rust and similar series. The…
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Testing
This post explores unit and integration testing in no_std executables. We will use Rust’s support for custom test frameworks to execute test functions inside our kernel. To report the results out of QEMU, we will use different features of QEMU and the bootimage tool. This blog…
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Paging Implementation
This post shows how to implement paging support in our kernel. It first explores different techniques to make the physical page table frames accessible to the kernel and discusses their respective advantages and drawbacks. It then implements an address translation function and a…
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Advanced Paging
This post explains techniques to make the physical page table frames accessible to our kernel. It then uses such a technique to implement a function that translates virtual to physical addresses. It also explains how to create new mappings in the page tables. This blog is openly…
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Introduction to Paging
This post introduces paging , a very common memory management scheme that we will also use for our operating system. It explains why memory isolation is needed, how segmentation works, what virtual memory is, and how paging solves memory fragmentation issues. It also explores…
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Hardware Interrupts
In this post, we set up the programmable interrupt controller to correctly forward hardware interrupts to the CPU. To handle these interrupts, we add new entries to our interrupt descriptor table, just like we did for our exception handlers. We will learn how to get periodic…
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Double Faults
This post explores the double fault exception in detail, which occurs when the CPU fails to invoke an exception handler. By handling this exception, we avoid fatal triple faults that cause a system reset. To prevent triple faults in all cases, we also set up an Interrupt Stack…