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“全国大学生计算机系统能力大赛 - 操作系统设计赛(全国)- OS内核实现赛道龙芯LA2K1000分赛道” 一等奖参赛作品

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NPUcore-IMPACT!!! [OSKernel2024 LA赛道#1]

西北工业大学,“全国大学生计算机系统能力大赛 - 操作系统设计赛(全国)- OS内核实现赛道龙芯LA2K1000分赛道” 一等奖(无特等奖)参赛作品。

队名来源:具有影响力的NPUcore,三个感叹号代表三个成员。

被带飞的队长:[内核设计与适配/文档] Yixu Feng (yixu-nwpu@mail.nwpu.edu.cn)

超级队员:[Debug高手] Yifei Zhang (yurzhang.oi@gmail.com), [硬件大神] Hanchen Zhang (jackwill17611136817@outlook.com), [场外支持] Huan Guo (个人博客)

✨ News

  • 2024.08.20 提交决赛答辩PPT。
  • 2024.08.19 现场赛完成,上板成功。
  • 2024.07.31 提交完整决赛报告。
  • 2024.06.01 提交完整初赛报告。
  • 2024.05.12 FAT32文件系统解耦合。
  • 2024.03.31 初赛测例满分。
  • 2024.03.20 支持龙芯赛道的NPUcore适配成功。
  • 2024.3.2 正式组队。

📢 给看到这个仓库的人的一段话:

致后面参加OS比赛龙芯赛道的西工大或者是其它学校的同学们:如果你们看到了这个仓库,说明你们找对了位置,这是我们NPUcore-IMPACT最原始的仓库,是基于NPUcore+LA的plus版(我们后续又重构了新的版本,但在这个仓库是找不到的)。这个仓库的NPUcore-FF分支是我们初赛满分(fat32文件系统)的分支,而ext4分支则是我们在决赛的时候对ext4文件系统进行适配的实验分支,但请注意ext4分支是无法跑通的,因为它不是我们debug的最终版

我们决赛最终阶段(线上赛+第二阶段)的代码决定不完全对外公布,原因是我们在决赛前的十五天内做了非常非常多的调整,比如:成功适配ext4,增加了很多新的syscall...。但是代价是,时间紧迫,我们的代码就是一大坨,我们真的不想把拉出来的低质量代码给大家看。因此我们仅把这个原始仓库公开给大家参考。下面是我推荐的参考链接:

  1. 如果你想使用rust版本基于LA的arch crate,请参考:NPUcore-LA2K1000-Arch

  2. 如果你想了解我们初赛的Debug过程,请参考:LA初赛测例修复

  3. 如果你想知道我们在决赛第一阶段做了什么,请参考:决赛第一阶段文档

  4. 如果你想知道我们的最终版NPUcore-IMPACT和别人不一样的地方,请参考:决赛答辩

  5. 如果你想知道我们现场赛做了什么,请参考:现场赛

  6. 如果你想知道我们最后是怎么答辩的,请参考:决赛稿

  7. 如果你想使用并修改我们的logo(需要学会使用AE),请参考:LOGO

  8. 如果你在Debug的时候遇到了我们没提到的困难,请参考:2024二等奖:NPUcore-重生之我是菜狗2022一等奖:RISCV原版NPUcore2023二等奖-NPUcore+LA

  9. 如果你想学习NPUcore的搭建过程,请参考:NPUcore-Book

  10. 如果你想使用我们的代码作为baseline,我们推荐使用(我们修改的NPUcore-重生之我是菜狗队伍代码,包含部分ext4):NPUcore-lwext4

  11. 如果你想参考我们Latex的文档格式与模板,请参考:NPUcore-IMPACT-doc

  12. 我们整理的龙芯参考文档:百度网盘:密码1145

  13. 我们的比赛测例:testcases源码testcases二进制文件

  14. 我们的QEMU环境:QEMU

👨‍🏫 想对我的学弟学妹们说的参赛建议:

  1. 请一定要重视上板,在QEMU上跑通不是真正的跑通。(QEMU和板子的区别主要是地址映射,出现问题请往这个方向查找)
  2. 不要完全相信比赛的硬件以及他对应的文档,每块板子其实都是独一无二的。一旦出现位置bug,建议一看板子元件,二读uboot源码,别研究黑盒。
  3. 同一份代码,在板子的不同时间、不同温度、不同姿态下会跑出来不一样的结果。
  4. 希望学弟学妹可以从头写一个新的NPUcore,而不是用我们这个老版,我希望这个版本仅作为你们的一个参考。
  5. 在学习阶段最好不要直接学习NPUcore,而是先做一下这个实验:xv6-loongarch
  6. 我建议学弟学妹不要盲目用这个版本的NPUcore-IMPACT作为你的baseline,以及它的耦合度非常非常高,我们废了半天劲才解耦
  7. 如果仍然选择我们的FAT32版本的NPUcore-IMPACT作为你们的baseline,那请参考我们的所有文档,并先实现vfs,把fsfat32完全解耦,再考虑增加新的文件系统(如果明年仍然是EXT4为主流)和系统调用。
  8. 现在的NPUcore-IMPACT在功能性上仍有很多不足,如果明年仍然需要跑ltp测例,那一定要多加系统调用(据说明年要拿好名次,可能需要200个syscall)。
  9. NPUcore2022主要做了cache上的优化,但是它也导致了很多功能上的问题,如果后面出了很多新的bug,请务必考虑这里,必要时可以抛弃曾经的亮点。
  10. 对于我们现在的NPUcore-IMPACT,请把功能优先于性能考虑,虽然性能上仍有很多优化空间,但是功能上的不完善会导致一分都得不到。
  11. 如果你们选择了龙芯赛道(如果明年还有的话),那么请做好完全找不到头绪的准备。
  12. 如果你们时间比较充裕,在完善了功能的前提下,可以考虑参考Pantheon进行性能优化,并尝试参考Alien添加UI界面。
  13. 如果是为了比赛,那么请在遵守规则的情况下,以拿到更高的分数为主,必要时候可能需要违背初心(但是我们极其不推荐,一定要注重提高自己的代码/文档/Debug水平)。
  14. 如果你有其它问题,请联系我们的邮箱,或者直接在QQ群里单杀我们。
  15. 如果你想复现我们的OS现象,请参考下方的教程。

基础环境配置

  1. make、Cmake安装(辅助编译工具) 执行:
sudo apt-get install make
sudo apt-get install cmake
  1. 安装rust对LoongArch的编译链

    • 安装rustup(rust的安装器+版本管理器)

      rustup install nightly-2024-02-03
    • 安装Rust工具链 由于LoongArch架构的交叉编译Rust工具链已经合并到上游, 目前不需要我们手动安装。
      Makefile 中有自动的检测脚本, 只需要后续的make命令即可。

    • 安装交叉编译工具。本项目使用的为在x86_64下编译产生loongarch64的编译工具。 Loong Arch GCC 13: https://github.com/LoongsonLab/oscomp-toolchains-for-oskernel

      wget https://github.com/LoongsonLab/oscomp-toolchains-for-oskernel/releases/download/gcc-13.2.0-loongarch64/gcc-13.2.0-loongarch64-linux-gnu.tgz
      
      tar zxf gcc-13.2.0-loongarch64-linux-gnu.tgz
      
      # 在.bashrc中增加交叉编译器路径。假设当前路径为:/opt/gcc-13.2.0-loongarch64-linux-gnu
      export PATH=${PATH}:/opt/gcc-13.2.0-loongarch64-linux-gnu/bin
      
      # 如果配置正确,输入如下命令
      loongarch64-linux-gnu-gcc -v
      
      #会显示如下:
      Using built-in specs.
      COLLECT_GCC=loongarch64-linux-gnu-gcc
      COLLECT_LTO_WRAPPER=/home/airxs/local/gcc-13.2.0-loongarch64-linux-gnu/bin/../libexec/gcc/loongarch64-linux-gnu/13.2.0/lto-wrapper
      Target: loongarch64-linux-gnu
      Configured with: ../configure --prefix=/home/airxs/user/gnu/cross-tools --build=x86_64-cross-linux-gnu --host=x86_64-cross-linux-gnu --target=loongarch64-linux-gnu --with-sysroot=/home/airxs/user/gnu/cross-tools/sysroot --with-mpfr=/home/airxs/user/gnu/cross-tools --with-gmp=/home/airxs/user/gnu/cross-tools --with-mpc=/home/airxs/user/gnu/cross-tools --enable-__cxa_atexit --enable-threads=posix --with-system-zlib --enable-libstdcxx-time --enable-checking=release --enable-default-pie --enable-languages=c,c++,fortran,objc,obj-c++,lto
      Thread model: posix
      Supported LTO compression algorithms: zlib
      gcc version 13.2.0 (GCC) 
      
  2. 缺少部分库文件和编译rust代码出现错误的问题 建议尝试make clean后, 删除对应文件夹的Cargo.lock, 尝试在Cargo.toml中删除版本限制再重新编译。

运行方式与运行效果

直接在根目录命令行make即可。 第一次运行推荐先执行一遍从而方便环境的安装和熟悉。

正常情况下, 应当呈现出下列运行效果:
ram=0x1f17f00
length=852992 must be 16777216 bytes,run command:
trucate -s 16777216 file
to resize file
oobsize = 64





_ __ __ _ _ ___ ___ __ _ _ / ___ __ \
| | | | | |\ | | __ [__ | | |\ | | | __ | \ |
|___ |__| |__| | \| |__] ___] |__| | \| \ |__] |__/ /

Trying to boot from SPI


U-Boot 2022.04 (Jan 26 2024 - 15:42:00 +0800)

CPU: LA264
Speed: Cpu @ 900 MHz/ Mem @ 400 MHz/ Bus @ 125 MHz
Model: loongson-2k1000
Board: LS2K1000-DP
DRAM: 1 GiB
Core: 74 devices, 20 uclasses, devicetree: board
cam_disable:1, vpu_disable:1, pcie0_enable:0, pcie1_enable:1
Loading Environment from SPIFlash... SF: Detected gd25q128 with page size 256 Bytes, erase size 4 KiB, total 16 MiB
*** Warning - bad CRC, using default environment

Cannot get ddc bus
In: serial
Out: serial
Err: serial vidconsole

eth0: using random MAC address - f2:ef:a7:28:76:cd

eth1: using random MAC address - 82:98:7e:f2:f8:e4
Net: Could not get PHY for mdio@0: addr 0
Could not get PHY for mdio@1: addr 0
3No ethernet found.

************************** Notice **************************
Press c to enter u-boot console, m to enter boot menu

************************************************************
Bus otg@40000000: dwc2_usb otg@40000000: Core Release: 0.000
dwc2_usb otg@40000000: SNPSID invalid (not DWC2 OTG device): 00000000
Port not available.
Bus ehci@40060000: USB EHCI 1.00
Bus ohci@40070000: USB OHCI 1.0
scanning bus ehci@40060000 for devices... 3 USB Device(s) found
scanning bus ohci@40070000 for devices... 1 USB Device(s) found
init ls_trigger_boot and set it default value
init ls_trigger_u_kernel and set it default value
init ls_trigger_u_rootfs and set it default value
init ls_trigger_u_uboot and set it default value
Saving Environment to SPIFlash... Erasing SPI flash...Writing to SPI flash...done
OK
Autoboot in 0 seconds
SF: Detected gd25q128 with page size 256 Bytes, erase size 4 KiB, total 16 MiB
device 0 offset 0xf0000, size 0x10000
SF: 65536 bytes @ 0xf0000 Read: OK

Reset SCSI
scanning bus for devices...
Target spinup took 0 ms.
Target spinup took 0 ms.
Target spinup took 0 ms.
SATA link 3 timeout.
SATA link 4 timeout.
SATA link 5 timeout.
AHCI 0001.0000 32 slots 6 ports 1.5 Gbps 0x3f impl SATA mode
flags: 64bit ncq only
Device 0: (0:0) Vendor: ATA Prod.: QEMU HARDDISK Rev: 2.5+
Type: Hard Disk
Capacity: 100.0 MB = 0.0 GB (204800 x 512)
Device 1: (1:0) Vendor: ATA Prod.: QEMU HARDDISK Rev: 2.5+
Type: Hard Disk
Capacity: 1024.0 MB = 1.0 GB (2097152 x 512)
Device 2: (2:0) Vendor: ATA Prod.: QEMU HARDDISK Rev: 2.5+
Type: Hard Disk
Capacity: 1024.0 MB = 1.0 GB (2097152 x 512)
** No partition table - scsi 0 **
Couldn't find partition scsi 0:1
Can't set block device
Wrong Image Format for bootm command
ERROR: can't get kernel image!
Bootcmd="setenv bootargs ${bootargs} root=/dev/sda${syspart} mtdparts=${mtdparts} video=${video}; sf probe;sf read ${fdt_addr} dtb;scsi reset;ext4load scsi 0:${syspart} ${loadaddr} /boot/uImage;bootm "
Boot Kernel failed. Kernel not found or bad.
=>
=>
=>
=> fatload scsi 0 ${loadaddr} /kernel.bin;go ${loadaddr};
47739944 bytes read in 761 ms (59.8 MiB/s)
## Starting application at 0x9000000090000000 ...
[kernel] NPUcore-IMAPCT!!! ENTER!
[kernel] UART address: 0x1fe20000
[bootstrap_init] PRCfg1 { SAVE reg. number: 8, Timer bits: 48, max vector entry spacing: 7 }
[kernel] Console initialized.
last 37479 Physical Frames.
.text [0x90000000, 0x90069000)
.rodata [0x90069000, 0x90075000)
.data [0x90081000, 0x92d88000)
.bss [0x92d88000, 0x96d99000)
mapping .text section
mapping .rodata section
mapping .data section
mapping .bss section
mapping physical memory
mapping memory-mapped registers
[get_timer_freq_first_time] clk freq: 100000000(from CPUCFG)
[CPUCFG 0x0] 1351680
[CPUCFG 0x1] 66253566
[CPUCFG 0x2] 6341127
[CPUCFG 0x3] 3327
[CPUCFG 0x4] 100000000
[CPUCFG 0x5] 65537
[CPUCFG 0x6] 0
[CPUCFG 0x10] 11325
[CPUCFG 0x11] 0
[CPUCFG 0x12] 0
[CPUCFG 0x13] 0
[CPUCFG 0x14] 0
Misc { 32-bit addr plv(1,2,3):: false,false,false, rdtime allowed for plv(1,2,3):: false,false,false, Disable dirty bit check for plv(0,1,2):: false,false,false, Misalignment check for plv(0,1,2,4):: false,false,false,false }
RVACfg { rbits: 0 }
[machine_init] MMAP_BASE: 0xffffff8000000000
[kernel] Hello, world!
Testing execve :
========== START test_execve ==========
I am test_echo.
execve success.
========== END main ==========
Testing brk :
========== START test_brk ==========
Before alloc,heap pos: 12288
After alloc,heap pos: 12352
Alloc again,heap pos: 12416
========== END test_brk ==========
Testing chdir :
========== START test_chdir ==========
chdir ret: 0
current working dir : /test_chdir
========== END test_chdir ==========
Testing clone :
========== START test_clone ==========
Child says successfully!
clone process successfully.
pid:3
========== END test_clone ==========
Testing close :
========== START test_close ==========
close 3 success.
========== END test_close ==========
Testing dup2 :
========== START test_dup2 ==========
from fd 100
========== END test_dup2 ==========
Testing dup :
========== START test_dup ==========
new fd is 3.
========== END test_dup ==========
Testing exit :
========== START test_exit ==========
exit OK.
========== END test_exit ==========
Testing fork :
========== START test_fork ==========
child process.
parent process. wstatus:0
========== END test_fork ==========
Testing fstat :
========== START test_fstat ==========
fstat ret: 0
fstat: dev: 2048, inode: 5784, mode: 33279, nlink: 1, size: 52, atime: 0, mtime: 0, ctime: 0
========== END test_fstat ==========
Testing getcwd :
========== START test_getcwd ==========
getcwd: / successfully!
========== END test_getcwd ==========
Testing getdents :
========== START test_getdents ==========
open fd:3
getdents fd:456
getdents success.
lib

========== END test_getdents ==========
Testing getpid :
========== START test_getpid ==========
getpid success.
pid = 2
========== END test_getpid ==========
Testing getppid :
========== START test_getppid ==========
getppid success. ppid : 1
========== END test_getppid ==========
Testing gettimeofday :
========== START test_gettimeofday ==========
gettimeofday success.
start:12098, end:12163
interval: 65
========== END test_gettimeofday ==========
Testing mkdir_ :
========== START test_mkdir ==========
mkdir ret: -17
mkdir success.
========== END test_mkdir ==========
Testing mmap :
========== START test_mmap ==========
file len: 27
mmap content: Hello, mmap successfully!
========== END test_mmap ==========
Testing mount :
========== START test_mount ==========
Mounting dev:/dev/vdb to ./mnt
mount return: 0
mount successfully
umount return: 0
========== END test_mount ==========
Testing munmap :
========== START test_munmap ==========
file len: 27
munmap return: 0
munmap successfully!
========== END test_munmap ==========
Testing open :
========== START test_open ==========
Hi, this is a text file.
syscalls testing success!

========== END test_open ==========
Testing openat :
========== START test_openat ==========
open dir fd: 3
openat fd: 4
openat success.
========== END test_openat ==========
Testing pipe :
========== START test_pipe ==========
cpid: 3
cpid: 0
Write to pipe successfully.

========== END test_pipe ==========
Testing read :
========== START test_read ==========
Hi, this is a text file.
syscalls testing success!

========== END test_read ==========
Testing sleep :
========== START test_sleep ==========
sleep success.
========== END test_sleep ==========
Testing times :
========== START test_times ==========
mytimes success
{tms_utime:274200, tms_stime:0, tms_cutime:0, tms_cstime:0}
========== END test_times ==========
Testing umount :
========== START test_umount ==========
Mounting dev:/dev/vda2 to ./mnt
mount return: 0
umount success.
return: 0
========== END test_umount ==========
Testing uname :
========== START test_uname ==========
Uname: Linux debian 5.10.0-7-riscv64 #1 SMP Debian 5.10.40-1 (2021-05-28) riscv64
========== END test_uname ==========
Testing unlink :
========== START test_unlink ==========
unlink success!
========== END test_unlink ==========
Testing wait :
========== START test_wait ==========
This is child process
wait child success.
wstatus: 0
========== END test_wait ==========
Testing waitpid :
========== START test_waitpid ==========
This is child process
waitpid successfully.
wstatus: 3
========== END test_waitpid ==========
Testing write :
========== START test_write ==========
Hello operating system contest.
========== END test_write ==========
Testing yield :
========== START test_yield ==========
I am child process: 3. iteration 0.
I am child process: 4. iteration 1.
I am child process: 3. iteration 0.
I am child process: 4. iteration 1.
I am child process: 5. iteration 2.
I am child process: 3. iteration 0.
I am child process: 4. iteration 1.
I am child process: 5. iteration 2.
I am child process: 3. iteration 0.
I am child process: 4. iteration 1.
I am child process: 5. iteration 2.
I am child process: 3. iteration 0.
I am child process: 4. iteration 1.
I am child process: 5. iteration 2.
I am child process: 5. iteration 2.
========== END test_yield ==========
[initproc] test finish

在打印了大量的测试结果后退出执行。

Makefile可用选项相关解释

内核编译与运行

注意,在命令后加入LOG=trace可以开启trace及以上的所有log, log从低到高等级分为trace, debug, info, warning, error
make run: 编译系统,且执行虚拟机测试
make gdb: 执行开启debug模式(需要配合gdb使用), 启动虚拟机但不运行

其他

make clean: 清理已经编译的项目(包括用户程序, 系统和FAT镜像)

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“全国大学生计算机系统能力大赛 - 操作系统设计赛(全国)- OS内核实现赛道龙芯LA2K1000分赛道” 一等奖参赛作品

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