Step by step, learn to develop an operating system on RISC-V

Related tags

Learning, Reference and Tutorials riscv-operating-system-mooc
Overview

Step by step, learn to develop an operating system on RISC-V

Introduction

This course is used to teach and demonstrate how to write a simple operating system kernel for the RISC-V platform from scratch. Released under the BSD 2-Clause license (For details, please read the LICENSE file under the root directory of this repository).

Operating environment

All demo codes have been verified under the following equipment environment:

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.2 LTS
Release:	20.04
Codename:	focal
$ uname -r
5.8.0-45-generic

There may be dependent libraries that need to be installed manually. If you are prompted that other libraries and dependencies are missing during the operation, please install them by yourself according to the prompts.

$ sudo apt update 
$ sudo apt install build-essential git gitk vim libfdt-dev libsdl2-dev

The experiment requires some running tools, pre-compiled binary files have been provided, the specific installation steps are described as follows:

First, create a working directory, and then enter the directory.

$ mkdir $HOME/ws
$ cd $HOME/ws

Download the development tool package tools.tar.gz, the download address is:https://share.weiyun.com/nyTqAGKh。

After downloading, copy the file to $HOME/ws and unzip it.

$ tar xzf tools.tar.gz

Add the following path to $HOME/.bashrc

export PATH="$PATH:$HOME/ws/tools/gcc/bin:$HOME/ws/tools/qemu/bin"

Re-import $HOME/.bashrc or restart the system to make the configuration effective.

Construction and usage

  • make：Compile and build
  • make run：Start qemu and run
  • make debug：Start debugging
  • make code：Disassemble to view binary code
  • make clean：cleanup

For specific use, please refer to the Makefile under the specific sub-project.

References

The design of this course refers to the following network resources, thank you :)

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Comments
  • 關於 External Interrupt

    關於 External Interrupt

    Hi there!

    關於外部中斷，我有一些疑惑，還望各位指教，在介紹第 11 章的外部中斷時，提到了我們可以對 PLIC 設置外部中斷做到 UART 輸入的功能，針對這個地方，我有兩點疑問:

    1. 我參考這一資訊，將外部中斷的處理方式移植到了 mini-riscv-os 上，但是我發現即使不在 OS 開機時也能使用 UART 輸入，想請問我是不是遺漏了什麼重要觀念
    2. 呈上題，如果不開啟外部中斷也能使用 UART 輸入，那在什麼情況下才會產出 IRQ = 10 的情況呢?

    謝謝。

    opened by ianchen0119 2
  • 在task_yield()调用r_mhartid()导致非法指令异常

    在task_yield()调用r_mhartid()导致非法指令异常

    Hi, 我正在尝试使用Rust实现RVOS。在实现第13章抢占式多任务的时候，在task_yield()中调用r_mhartid()导致 illegal instruction ，通过调试发现是csrr $0, mhartid这条指令导致的异常。 应该是与csrr这个指令有关，因为在测试csrw的时候也不行。 我的代码在这：https://github.com/RobotHuang/rvos-rust/blob/master/os/src/sched.rs#L145 Thanks

    opened by uran0sH 1
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