95 lines
2.8 KiB
Nix
95 lines
2.8 KiB
Nix
# 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 (uncompressed vmlinux) and initrd (squashfs) images
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{
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system = {
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crossSystem = {
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config = "mips-unknown-linux-musl";
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gcc = {
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abi = "32";
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arch = "mips32"; # maybe mips_24kc-
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};
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};
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};
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description = ''
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QEMU
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****
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This is not a hardware device. This target produces an image for
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QEMU, the "generic and open source machine emulator and
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virtualizer".
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Liminix can build QEMU for both MIPS (:code:`qemu` device) and Aarch64 (:code:`qemu-aarch64` device)
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MIPS QEMU emulates a "Malta" board, which was an ATX form factor
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evaluation board made by MIPS Technologies, but mostly in Liminix
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we use paravirtualized devices (Virtio) instead of emulating
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hardware. For Aarch64 we use the QEMU "virt" board.
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Building an image for QEMU results in a :file:`result/` directory
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containing ``run.sh`` ``vmlinux``, ``rootfs`` and possibly
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(architecture-dependent) ``Image``. To invoke the emulator,
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run ``run.sh``.
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The configuration includes two emulated "hardware" ethernet
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devices and the kernel :code:`mac80211_hwsim` module to
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provide an emulated wlan device. To read more about how
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to connect to this network, refer to :ref:`qemu-networking`
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in the Development manual.
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'';
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module = {pkgs, config, ... }: {
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imports = [ ../../modules/arch/mipseb.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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MIPS_MALTA= "y";
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CPU_MIPS32_R2= "y";
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MTD = "y";
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MTD_BLOCK2MTD = "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_8250= "y";
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SERIAL_8250_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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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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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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