bootable aarch64 liminux with qemu
I may have broken the run-liminix-vm command a bit for MIPS due to necessary changes in how we pass the command line. If CI isn't green for this commit and youre trying the worked examples, I suggest reverting to the commit before this one.
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5 changed files with 131 additions and 12 deletions
69
devices/qemu-aarch64/default.nix
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69
devices/qemu-aarch64/default.nix
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@ -0,0 +1,69 @@
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# This "device" generates images that can be used with the QEMU
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# emulator. The default output is a directory containing separate
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# kernel ("Image" format) and root filesystem (squashfs or jffs2)
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# images
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{
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system = {
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crossSystem = {
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config = "aarch64-unknown-linux-musl";
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};
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};
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module = {pkgs, config, ... }: {
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imports = [ ../../modules/arch/aarch64.nix ];
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kernel = {
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src = pkgs.pkgsBuildBuild.fetchurl {
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name = "linux.tar.gz";
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url = "https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.15.71.tar.gz";
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hash = "sha256-yhO2cXIeIgUxkSZf/4aAsF11uxyh+UUZu6D1h92vCD8=";
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};
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config = {
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VIRTUALIZATION = "y";
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PCI_HOST_GENERIC="y";
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MTD = "y";
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MTD_BLOCK2MTD = "y";
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MTD_BLKDEVS = "y";
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MTD_BLOCK = "y";
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VIRTIO_MENU = "y";
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PCI = "y";
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VIRTIO_PCI = "y";
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BLOCK = "y";
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VIRTIO_BLK = "y";
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NETDEVICES = "y";
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VIRTIO_NET = "y";
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SERIAL_EARLYCON_ARM_SEMIHOST = "y"; # earlycon=smh
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SERIAL_AMBA_PL011 = "y";
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SERIAL_AMBA_PL011_CONSOLE = "y";
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};
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};
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hardware =
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let
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mac80211 = pkgs.mac80211.override {
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drivers = ["mac80211_hwsim"];
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klibBuild = config.system.outputs.kernel.modulesupport;
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};
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in {
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defaultOutput = "vmroot";
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loadAddress = "0x0";
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entryPoint = "0x0";
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rootDevice = "/dev/mtdblock0";
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flash.eraseBlockSize = "65536"; # c.f. pkgs/mips-vm/mips-vm.sh
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networkInterfaces =
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let inherit (config.system.service.network) link;
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in {
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wan = link.build { ifname = "eth0"; };
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lan = link.build { ifname = "eth1"; };
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wlan_24 = link.build {
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ifname = "wlan0";
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dependencies = [ mac80211 ];
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};
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};
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};
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};
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}
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@ -49,6 +49,7 @@
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};
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in {
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defaultOutput = "vmroot";
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rootDevice = "/dev/mtdblock0";
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flash.eraseBlockSize = "65536"; # c.f. pkgs/run-liminix-vm/run-liminix-vm.sh
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networkInterfaces =
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let inherit (config.system.service.network) link;
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16
modules/arch/aarch64.nix
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16
modules/arch/aarch64.nix
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{ lib, pkgs, config, ...}:
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{
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config = {
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kernel.config = {
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CPU_LITTLE_ENDIAN= "y";
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CPU_BIG_ENDIAN= "n";
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# CMDLINE_FROM_BOOTLOADER availability is conditional
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# on CMDLINE being set to something non-empty
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CMDLINE="\"console=ttyAMA0\"";
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CMDLINE_FROM_BOOTLOADER = "y";
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};
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boot.commandLine = [
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"console=ttyAMA0,38400"
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];
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};
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}
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@ -7,6 +7,12 @@
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let
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inherit (lib) mkOption types concatStringsSep;
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inherit (pkgs) liminix callPackage writeText;
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arch = let s = pkgs.stdenv; in
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if s.isAarch64
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then "aarch64"
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else if s.isMips
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then "mips"
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else throw "can't determine arch";
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in
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{
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imports = [
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inherit dtb;
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};
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# could use trivial-builders.linkFarmFromDrvs here?
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vmroot = pkgs.runCommand "qemu" {} ''
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mkdir $out
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cd $out
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ln -s ${config.system.outputs.rootfs} rootfs
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ln -s ${kernel} vmlinux
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ln -s ${manifest} manifest
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ln -s ${kernel.headers} build
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'';
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vmroot =
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let
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cmdline = builtins.toJSON (concatStringsSep " " config.boot.commandLine);
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makeBootableImage = pkgs.runCommandCC "objcopy" {}
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(if pkgs.stdenv.isAarch64
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then "${pkgs.stdenv.cc.targetPrefix}objcopy -O binary -S ${kernel} $out"
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else "cp ${kernel} $out");
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in pkgs.runCommandCC "vmroot" {} ''
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mkdir $out
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cd $out
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ln -s ${config.system.outputs.rootfs} rootfs
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ln -s ${kernel} vmlinux
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ln -s ${manifest} manifest
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ln -s ${kernel.headers} build
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echo ${cmdline} > commandline
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cat > run.sh << EOF
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#!${pkgs.runtimeShell}
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CMDLINE=${cmdline} run-liminix-vm --arch ${arch} ${makeBootableImage} ${config.system.outputs.rootfs}
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EOF
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chmod +x run.sh
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'';
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manifest = writeText "manifest.json" (builtins.toJSON config.filesystem.contents);
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};
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@ -12,6 +12,12 @@ usage(){
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exit 1
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}
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arch="mips"
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if test "$1" = "--arch" ; then
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arch=$2
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shift;shift
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fi
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if test "$1" = "--background" ; then
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statedir=$2
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if test -z "$statedir" || ! test -d $statedir ; then
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@ -39,13 +45,21 @@ if test -n "$3"; then
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initramfs="-initrd $3"
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fi
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case "$arch" in
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mips)
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QEMU="qemu-system-mips -M malta"
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;;
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aarch64)
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QEMU="qemu-system-aarch64 -M virt -semihosting -cpu cortex-a72"
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;;
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esac
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INIT=${INIT-/bin/init}
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echo $QEMU_OPTIONS
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qemu-system-mips \
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-M malta -m 256 \
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set -x
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$QEMU \
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-m 256 \
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-echr 16 \
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-append "liminix default console=ttyS0,38400n8 panic=10 oops=panic init=$INIT loglevel=8 root=/dev/mtdblock0 block2mtd.block2mtd=/dev/vda,65536" \
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-append "$CMDLINE liminix root=/dev/mtdblock0 block2mtd.block2mtd=/dev/vda,65536" \
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-drive file=$rootfs,format=raw,readonly=off,if=virtio,index=0 \
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${initramfs} \
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-netdev socket,id=access,mcast=230.0.0.1:1234,localaddr=127.0.0.1 \
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