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77 lines
3.4 KiB
Markdown
77 lines
3.4 KiB
Markdown
# rCore-Tutorial-v3
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rCore-Tutorial version 3.5. See the [Documentation in Chinese](https://rcore-os.github.io/rCore-Tutorial-Book-v3/).
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## news
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- 2021.07.29: Now we are updating our labs. Please checkout chX-dev Branches for our current new labs. (Notice: please see the [Dependency] section in the end of this doc)
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## Overview
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This project aims to show how to write an **Unix-like OS** running on **RISC-V** platforms **from scratch** in **[Rust](https://www.rust-lang.org/)** for **beginners** without any background knowledge about **computer architectures, assembly languages or operating systems**.
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## Features
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* Platform supported: `qemu-system-riscv64` simulator or dev boards based on [Kendryte K210 SoC](https://canaan.io/product/kendryteai) such as [Maix Dock](https://www.seeedstudio.com/Sipeed-MAIX-Dock-p-4815.html)
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* OS
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* concurrency of multiple processes
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* preemptive scheduling(Round-Robin algorithm)
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* dynamic memory management in kernel
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* virtual memory
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* a simple file system with a block cache
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* an interactive shell in the userspace
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* **only 4K+ LoC**
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* [A detailed documentation in Chinese](https://rcore-os.github.io/rCore-Tutorial-Book-v3/) in spite of the lack of comments in the code(English version is not available at present)
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## Run our project
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TODO:
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## Working in progress
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Now we are still updating our project, you can find latest changes on branches `chX-dev` such as `ch1-dev`. We are intended to publish first release 3.5.0 after completing most of the tasks mentioned below.
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Overall progress: ch7
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### Completed
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* [x] automatically clean up and rebuild before running our project on a different platform
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* [x] fix `power` series application in early chapters, now you can find modulus in the output
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* [x] use `UPSafeCell` instead of `RefCell` or `spin::Mutex` in order to access static data structures and adjust its API so that it cannot be borrowed twice at a time(mention `& .exclusive_access().task[0]` in `run_first_task`)
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* [x] move `TaskContext` into `TaskControlBlock` instead of restoring it in place on kernel stack(since ch3), eliminating annoying `task_cx_ptr2`
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* [x] replace `llvm_asm!` with `asm!`
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* [x] expand the fs image size generated by `rcore-fs-fuse` to 128MiB
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* [x] add a new test named `huge_write` which evaluates the fs performance(qemu\~500KiB/s k210\~50KiB/s)
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* [x] flush all block cache to disk after a fs transaction which involves write operation
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### Todo(High priority)
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* [ ] bug fix: we should call `find_pte` rather than `find_pte_create` in `PageTable::unmap`
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* [ ] bug fix: check validity of level-3 pte in `find_pte` instead of checking it outside this function
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* [ ] use old fs image optionally, do not always rebuild the image
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* [ ] replace `spin::Mutex` with `UPSafeCell` before SMP chapter
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* [ ] add new system calls: getdents64/fstat
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* [ ] shell functionality improvement(to be continued...)
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* [ ] add a new chapter about synchronization & mutual exclusion(uniprocessor only)
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* [ ] give every non-zero process exit code an unique and clear error type
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* [ ] effective error handling of mm module
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### Todo(Low priority)
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* [ ] rewrite practice doc and remove some inproper questions
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* [ ] provide smooth debug experience at a Rust source code level
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* [ ] format the code using official tools
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* [ ] support Allwinner's RISC-V D1 chip
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## Dependency
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### Binaries
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* rustc 1.56.0-nightly (b03ccace5 2021-08-24)
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* qemu: 5.0.0
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* rustsbi: qemu[7d71bfb7] k210[563144b0]
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### Crates
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We will add them later.
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