NJU-ProjectN/nemu ics2023 initialized
NJU-ProjectN/nemu eb63cf3568dbf4e0c3c6ef462e6ec685550fabbc Merge pull request #76 from rijuyuezhu/master
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nemu/resource/debian/README.md
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nemu/resource/debian/README.md
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# riscv64 debian镜像制作
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制作需要`qemu-riscv64-static`, 建议在debian 10或ubuntu 19.04的系统(可尝试使用docker)中进行操作.
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* 创建空镜像和分区
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```
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dd if=/dev/zero of=debian.img bs=1G count=16 # 此处镜像大小为16GB
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sudo cfdisk debian.img # 可创建两个分区, 第一个分区12GB作为rootfs, 第二个分区4GB作为swap
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sudo losetup --partscan --show --find debian.img # 将debian.img作为loop设备
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ls /dev/loop0* # 此时应该能看到/dev/loop0p1和/dev/loop0p2两个分区
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```
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* 创建ext4和swap文件系统
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```
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sudo mkfs.ext4 /dev/loop0p1
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sudo mkswap /dev/loop0p2
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```
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* 挂载ext4分区
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```
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sudo mount /dev/loop0p1 /mnt
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```
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* 安装debian base system.
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下面两条命令的操作来自[debian社区的安装指南](https://wiki.debian.org/RISC-V#debootstrap).
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```
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sudo apt-get install debootstrap qemu-user-static binfmt-support debian-ports-archive-keyring
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sudo debootstrap --arch=riscv64 --keyring /usr/share/keyrings/debian-ports-archive-keyring.gpg --include=debian-ports-archive-keyring unstable /mnt http://deb.debian.org/debian-ports
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```
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若要安装x86系统, 则输入
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```
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sudo debootstrap --arch=i386 --keyring /usr/share/keyrings/debian-archive-keyring.gpg --include=debian-archive-keyring stable /mnt http://deb.debian.org/debian
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```
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* 进入镜像
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```
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sudo chroot /mnt /bin/bash
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```
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此时实际上是通过`qemu-riscv64-static`来执行镜像中的riscv64可执行文件.
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* 安装所需工具(根据实际情况选择)
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```
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apt-get update
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apt-get install systemd
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apt-get install gcc build-essential
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apt-get install tmux libreadline-dev
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apt-get install net-tools openssh-server
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# fix long delay of openssh server
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apt-get install haveged
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apt-get install sbt
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```
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* 修复`NO_PUBKEY E852514F5DF312F6`错误, 见[这里](https://www.reddit.com/r/RISCV/comments/sn0cph/sipeed_debian_the_following_signatures_couldnt_be/)
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```
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curl https://www.ports.debian.org/archive_2022.key | apt-key add -
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```
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* 同步时间
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```
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apt-get install ntpdate
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ntpdate 0.asia.pool.ntp.org
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```
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* 在`/etc/fstab`中添加swap分区
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```
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/dev/mmcblk0p2 none swap sw 0 0
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```
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* 添加/root/目录的写和执行权限, 使得host上的普通用户可以访问
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```
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chmod a+w,a+x /root
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```
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* 在/root/目录下提前写入所需的测试文件, 如hello.c等.
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* 在/root/.bashrc中添加如下内容, 可以实现登录后自动运行命令(根据实际情况修改测试的命令):
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```
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TMP_DIR=/run/mytest
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cmd=(
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# enbale swap
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"swapon -a"
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# show system information
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"uname -a"
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"cat /etc/issue"
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"cat /proc/cpuinfo"
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"df -ah"
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"free -h"
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# show time
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"date"
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"uptime"
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# create and switch to tmp directory
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"mkdir $TMP_DIR"
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"cd $TMP_DIR"
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# compile and run hello
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"ls /root"
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"ls /root/hello"
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"cat /root/hello/hello.c"
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"gcc -time /root/hello/hello.c -o $TMP_DIR/hello"
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"ls -lh $TMP_DIR"
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"$TMP_DIR/hello"
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# compile and run x86-nemu
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"ls /root/nemu"
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"cp -r /root/nemu $TMP_DIR"
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"export NEMU_HOME=$TMP_DIR/nemu"
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"make -C $TMP_DIR/nemu ISA=x86"
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"ls -lh /root/nemu-prog"
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"file /root/nemu-prog/amtest-x86-nemu.elf"
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"$TMP_DIR/nemu/build/x86-nemu --batch --mainargs=h /root/nemu-prog/amtest-x86-nemu.bin"
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"file /root/nemu-prog/microbench-x86-nemu.elf"
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"$TMP_DIR/nemu/build/x86-nemu --batch --mainargs=test /root/nemu-prog/microbench-x86-nemu.bin"
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# compile and run riscv64-nemu
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"make -C $TMP_DIR/nemu clean"
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"make -C $TMP_DIR/nemu ISA=riscv64"
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"$TMP_DIR/nemu/build/riscv64-nemu --batch /root/nemu-prog/linux-hello-riscv64-nemu.bin"
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)
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prompt="`whoami`@`hostname`:`pwd`#"
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echo -e "\n============ Now running preset commands =============\n"
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for ((i = 0; i < ${#cmd[@]}; i++)); do
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c=${cmd[$i]}
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echo "$prompt $c"
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$c
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echo ""
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done
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echo -e "\n============ End of preset commands =============\n"
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/root/nemutrap/good-trap
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```
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* 若在不方便输入的环境(如NEMU, verilator仿真等)中测试, 可采用如下两种方式的其中一种, 避免登录时输入
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* 通过紧急模式登录
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```
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cd /lib/systemd/system
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# 通过紧急模式登录, 不启动非必须的服务, 节省将近一半的登录时间
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ln -sf emergency.target default.target
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# 跳过登录提示符, 直接运行bash
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vim emergency.service
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-ExecStart=-/lib/systemd/systemd-sulogin-shell emergency
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+ExecStart=-/bin/bash
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```
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* 免密码登录, 见[这里](https://superuser.com/questions/969923/automatic-root-login-in-debian-8-0-console-only)
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```
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cd /lib/systemd/system
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vim serial-getty@.service
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-ExecStart=-/sbin/agetty -o '-p -- \\u' --keep-baud 115200,57600,38400,9600 %I $TERM
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+ExecStart=-/sbin/agetty -a root --keep-baud 115200,57600,38400,9600 %I $TERM
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```
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* 退出并卸载镜像
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```
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exit # 之前通过`chroot`方式进入
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sudo umount /mnt # 记得卸载! 在未卸载镜像的情况下通过可写方式再次打开`debian.img`(如作为qemu的文件系统), 镜像将会损坏!
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sudo losetup -d /dev/loop0 # 删除loop设备
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```
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* 修改`nemu/src/device/sdcard.c`中`init_sdcard()`中打开的镜像文件路径, 即可使用制作的镜像.
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在i9-9900k上测试, 约90s后看到debian的登录提示符.
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* 当以可写方式启动镜像时, NEMU遇到错误或通过Ctrl+C直接退出NEMU时, 可能会损坏镜像的崩溃一致性, 此时可以通过fsck命令修复分区.
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* 更多命令可参考[这里](https://github.com/carlosedp/riscv-bringup/blob/master/Debian-Rootfs-Guide.md).
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