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# XV6-RISCV On K210
Run xv6-riscv on k210 board
[English](./README.md) | [中文](./README_cn.md)
```
(`-') (`-') <-.(`-')
(OO )_.-> _(OO ) __( OO)
(_| \_)--.,--.(_/,-.\ ,--. (`-') '-'. ,--. .----. .--. .----.
\ `.' / \ \ / (_/ / .' ( OO).-> | .' / \_,-. | /_ | / .. \
\ .') \ / / . / -. (,------. | /) .' .' | | | / \ .
.' \ _ \ /_)' .-. \ `------' | . ' .' /_ | | ' \ / '
/ .'. \ \-'\ / \ `-' / | |\ \ | | | | \ `' /
`--' '--' `-' `----' `--' '--' `------' `--' `---''
```
![run-k210](./img/xv6-k210_run.gif)
## Dependencies
+ `k210 board` or `qemu-system-riscv64`
+ RISC-V Toolchain: [riscv-gnu-toolchain](https://github.com/riscv/riscv-gnu-toolchain.git)
## Installation
```bash
git clone https://github.com/HUST-OS/xv6-k210
```
## Run on k210 board
First you need to connect your k210 board to your PC.
And check the `USB serial port` (In my situation it will be `ttyUSB0`):
```bash
ls /dev/ | grep USB
```
Build the kernel and user program:
```bash
cd xv6-k210
make build
```
Instead of the original file system, xv6-k210 runs with FAT32. You might need an SD card with FAT32 format.
Your SD card should NOT keep a partition table. To start `shell` and other user programs, you need to copy them into your SD card.
First, connect and mount your SD card (SD card reader required).
```bash
ls /dev/ # To check your SD device
mount <your SD device name> <mount point>
make sdcard dst="SD card mount point"
umount <mount point>
```
Then, insert the SD card to your k210 board and run:
```bash
make run
```
Sometimes you should change the `USB serial port`:
```bash
make run k210-serialport=`Your-USB-port`(default by ttyUSB0)
```
Ps: Most of the k210-port in Linux is ttyUSB0, if you use Windows or Mac OS, this doc
may help you: [maixpy-doc](https://maixpy.sipeed.com/zh/get_started/env_install_driver.html#)
## Run on qemu-system-riscv64
First, make sure `qemu-system-riscv64` is installed on your system.
Second, make a disk image file with FAT32 file system.
```bash
make fs
```
It will generate a disk image file `fs.img`, and compile some user programs like `shell` then copy them into the `fs.img`.
As long as the `fs.img` exists, you don't need to do this every time before running, unless you want to update it.
Finally, start running.
```bash
make run platform=qemu
```
Ps: Press Ctrl + A then X to quit qemu.
## About shell
The shell commands are user programs, too. Those program should be put in a "/bin" directory in your SD card or the `fs.img`.
Now we support a few useful commands, such as `cd`, `ls`, `cat` and so on.
In addition, `shell` supports some shortcut keys as below:
- Ctrl-H -- backspace
- Ctrl-U -- kill a line
- Ctrl-D -- end of file (EOF)
- Ctrl-P -- print process list
## Add my programs on xv6-k210
1. Make a new C source file in `xv6-user/` like `myprog.c`, and put your codes;
2. You can include `user.h` to use the functions declared in it, such as `open`, `gets` and `printf`;
3. Add a line "`$U/_myprog\`" in `Makefile` as below:
```Makefile
UPROGS=\
$U/_init\
$U/_sh\
$U/_cat\
...
$U/_myprog\ # Don't ignore the leading '_'
```
4. Then make:
```bash
make userprogs
```
Now you might see `_myprog` in `xv6-user/` if no error detected. Finally you need to copy it into your SD (see [here](#run-on-k210-board))
or FS image (see [here](#run-on-qemu-system-riscv64)).
## Progress
- [x] Multicore boot
- [x] Bare-metal printf
- [x] Memory alloc
- [x] Page Table
- [x] Timer interrupt
- [x] S mode extern interrupt
- [x] Receive uarths message
- [x] SD card driver
- [x] Process management
- [x] File system
- [x] User program
- [X] Steady keyboard input(k210)
## TODO
Fix the bugs of U-mode exception on k210.
## 基本情况
比赛方向 OS原理赛道-小型内核实现
队伍学校 合肥工业大学(宣城校区)
队伍ID T202419359994371
队伍名称 SOS队
队伍成员 邓梓剑 纪林圣 周文超
指导教师 田卫东 周红鹃
我们保留了原 `xv6-k210` ( https://github.com/HUST-OS/xv6-k210 )中的所有文档,由于我们队伍整体操作系统项目开发经验十分不足,因此打算在前辈的基础上进行一些操作系统内核代码编写的学习,其中文档部分将以2024为前缀进行区分,对于文档描述中冲突的部分,以新文档为准。
### [初赛阶段](doc/2024_初赛文档.md)
* [环境配置](doc/2024_环境配置.md)
* [系统调用](doc/2024_系统调用.md)
* [MFQ实现](doc/2024_MFQ实现.md)
## 各阶段分工
### 初赛阶段
邓梓剑:环境配置、系统调用
纪林圣:多级反馈队列调度算法多级进程调度
周文超:
## 比赛收获
* 通过操作系统大赛,我们学习到了操作系统各功能实现的基本流程,并且真实地运行了一个小型的操作系统内核
* 为我们之后在系统领域深造打下了深厚的基础
**纪林圣:**
通过此次多级反馈队列算法的实现,我理解了操作系统调度的核心原理,并且也掌握了如何通过时间片和优先级动态调整进程的执行顺序。在设计之初,自己对MFQ的原理比较熟悉,但是如何根据xv6-k210代码结构实现基于此架构的MFQ,成为了一大难题,在逐步学习和实践的过程中感受到了操作系统设计的魅力,我也切实提升了自己的理解和能力。
此外,多核环境下的调度也让我印象深刻。在调试过程中,我曾因为未正确处理多核同步而导致队列状态出现错误。通过加锁机制和严格的队列操作规范,我解决了这些问题,并对多核系统中的数据一致性有了更加直观的认识。这是我从理论到实践的一次重要突破。尽管如此,由于时间仓促,代码中一定会存在许多不完善,对于复杂的调度算法,除了功能的完整性,还需要考虑更多的异常处理、边界条件和并发同步问题。
## 致谢
感谢 https://github.com/HUST-OS/xv6-k210 [README_cn.md](README_cn.md)以及 rCore ( https://rcore-os.cn/rCore-Tutorial-Book-v3/index.html )
## 基本情况
比赛方向 OS原理赛道-小型内核实现
队伍学校 合肥工业大学(宣城校区)
队伍ID T202419359994371
队伍名称 SOS队
队伍成员 邓梓剑 纪林圣 周文超
指导教师 田卫东 周红鹃
我们保留了原 `xv6-k210` ( https://github.com/HUST-OS/xv6-k210 )中的所有文档,由于我们队伍整体操作系统项目开发经验十分不足,因此打算在前辈的基础上进行一些操作系统内核代码编写的学习,其中文档部分将以2024为前缀进行区分,对于文档描述中冲突的部分,以新文档为准。
### [初赛阶段](doc/2024_初赛文档.md)
* [环境配置](doc/2024_环境配置.md)
* [系统调用](doc/2024_系统调用.md)
* [MFQ实现](doc/2024_MFQ实现.md)
## 各阶段分工
### 初赛阶段
邓梓剑:环境配置、系统调用
纪林圣:多级反馈队列调度算法多级进程调度
周文超:
## 比赛收获
* 通过操作系统大赛,我们学习到了操作系统各功能实现的基本流程,并且真实地运行了一个小型的操作系统内核
* 为我们之后在系统领域深造打下了深厚的基础
**纪林圣:**
通过此次多级反馈队列算法的实现,我理解了操作系统调度的核心原理,并且也掌握了如何通过时间片和优先级动态调整进程的执行顺序。在设计之初,自己对MFQ的原理比较熟悉,但是如何根据xv6-k210代码结构实现基于此架构的MFQ,成为了一大难题,在逐步学习和实践的过程中感受到了操作系统设计的魅力,我也切实提升了自己的理解和能力。
此外,多核环境下的调度也让我印象深刻。在调试过程中,我曾因为未正确处理多核同步而导致队列状态出现错误。通过加锁机制和严格的队列操作规范,我解决了这些问题,并对多核系统中的数据一致性有了更加直观的认识。这是我从理论到实践的一次重要突破。尽管如此,由于时间仓促,代码中一定会存在许多不完善,对于复杂的调度算法,除了功能的完整性,还需要考虑更多的异常处理、边界条件和并发同步问题。
## 致谢
感谢 https://github.com/HUST-OS/xv6-k210 [README_cn.md](README_cn.md)以及 rCore ( https://rcore-os.cn/rCore-Tutorial-Book-v3/index.html )
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