启动xv6

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启动xv6(easy)

前言

我的实验环境是一台PC, 运行在我的寝室，作为工作站运行。

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[I] lyc@lyc-workstation ~/w/学/C/c/MIT6.S081 (master)> neofetch
         -/oyddmdhs+:.                lyc@lyc-workstation
     -odNMMMMMMMMNNmhy+-`             -------------------
   -yNMMMMMMMMMMMNNNmmdhy+-           OS: Gentoo Base System release 2.8 x86_64
 `omMMMMMMMMMMMMNmdmmmmddhhy/`        Host: MS-7D42 1.0
 omMMMMMMMMMMMNhhyyyohmdddhhhdo`      Kernel: 5.18.5-gentoo-lyc
.ydMMMMMMMMMMdhs++so/smdddhhhhdm+`    Uptime: 22 hours, 29 mins
 oyhdmNMMMMMMMNdyooydmddddhhhhyhNd.   Packages: 1473 (emerge)
  :oyhhdNNMMMMMMMNNNmmdddhhhhhyymMh   Shell: bash 5.1.16
    .:+sydNMMMMMNNNmmmdddhhhhhhmMmy   Resolution: 3840x2160
       /mMMMMMMNNNmmmdddhhhhhmMNhs:   DE: Plasma 5.24.5
    `oNMMMMMMMNNNmmmddddhhdmMNhs+`    WM: KWin
  `sNMMMMMMMMNNNmmmdddddmNMmhs/.      WM Theme: Breeze 微风
 /NMMMMMMMMNNNNmmmdddmNMNdso:`        Theme: Breeze Light [Plasma], Breeze [GTK2/3]
+MMMMMMMNNNNNmmmmdmNMNdso/-           Icons: Fluent [Plasma], Fluent [GTK2/3]
yMMNNNNNNNmmmmmNNMmhs+/-`             Terminal: Konsole
/hMMNNNNNNNNMNdhs++/-`                CPU: 12th Gen Intel i7-12700 (20) @ 4.900GHz
`/ohdmmddhys+++/:.`                   GPU: Intel AlderLake-S GT1
  `-//////:--.                        Memory: 36679MiB / 128619MiB




RISC-V 64运行和交叉编译环境

cross-compilers

要运行老师给的xv6操作系统代码，必须先有交叉编译工具。[1]

用gentoo的crossdev工具[2]安装跨指令集的编译工具，包括GNU binutils, gcc, g++。

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sudo crossdev --stable -t riscv64-unknown-linux-gnu

Emulator(QEMU)

安装打开了riscv64对应的编译开关的qemu，我的实验主机是Gentoo Linux操作系统，在Portage中加入USE

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write-use app-emulation qemu qemu_user_targets_riscv64 qemu_softmmu_targets_riscv64

其中write-use是一个自己写的辅助脚本

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lyc@lyc-workstation ~> cat $(which write-use)
#!/bin/fish

set portage_use_dir "/etc/portage/package.use"
echo "$argv[1]/$argv[2] $argv[3..]" | sudo tee -a "$portage_use_dir/$argv[1]"

然后，重新编译qemu

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sudo emerge -av qemu

获取实验源代码

clone mit xv6仓库

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git clone git://g.csail.mit.edu/xv6-labs-2021

选到util分支

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cd xv6-labs-2021 && git checkout util

编译和进入xv6系统

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[I] lyc@lyc-workstation ~/w/学/C/c/M/xv6-labs-2021 (util)> make qemu
qemu-system-riscv64 -machine virt -bios none -kernel kernel/kernel -m 128M -smp 3 -nographic -drive file=fs.img,if=none,format=raw,id=x0 -device virtio-blk-device,drive=x0,bus=virtio-mmio-bus.0

xv6 kernel is booting

hart 1 starting
hart 2 starting
init: starting sh
$

Ctrl-a x退出系统。